Removed openssl, and curl, and added mbedded tls.curl-removal

Almost fully removed curl, needs more testing.

Fixed most issues, now trying to cross compile.

Fix?

Sigh.

1 files changed, 4392 insertions, 0 deletions

diff --git a/lib/mbedtls-2.27.0/ChangeLog b/lib/mbedtls-2.27.0/ChangeLog
new file mode 100644
index 0000000..89572ca
--- /dev/null
+++ b/lib/mbedtls-2.27.0/ChangeLog
@@ -0,0 +1,4392 @@
+mbed TLS ChangeLog (Sorted per branch, date)
+
+= mbed TLS 2.27.0 branch released 2021-07-07
+
+API changes
+   * Update AEAD output size macros to bring them in line with the PSA Crypto
+     API version 1.0 spec. This version of the spec parameterizes them on the
+     key type used, as well as the key bit-size in the case of
+     PSA_AEAD_TAG_LENGTH.
+     The old versions of these macros were renamed and deprecated as follows:
+     - PSA_AEAD_TAG_LENGTH          -> PSA_AEAD_TAG_LENGTH_1_ARG
+     - PSA_AEAD_ENCRYPT_OUTPUT_SIZE -> PSA_AEAD_ENCRYPT_OUTPUT_SIZE_2_ARG
+     - PSA_AEAD_DECRYPT_OUTPUT_SIZE -> PSA_AEAD_DECRYPT_OUTPUT_SIZE_2_ARG
+     - PSA_AEAD_UPDATE_OUTPUT_SIZE  -> PSA_AEAD_UPDATE_OUTPUT_SIZE_2_ARG
+     - PSA_AEAD_FINISH_OUTPUT_SIZE  -> PSA_AEAD_FINISH_OUTPUT_SIZE_1_ARG
+     - PSA_AEAD_VERIFY_OUTPUT_SIZE  -> PSA_AEAD_VERIFY_OUTPUT_SIZE_1_ARG
+   * Implement one-shot cipher functions, psa_cipher_encrypt and
+     psa_cipher_decrypt, according to the PSA Crypto API 1.0.0
+     specification.
+
+Requirement changes
+   * The library now uses the %zu format specifier with the printf() family of
+     functions, so requires a toolchain that supports it. This change does not
+     affect the maintained LTS branches, so when contributing changes please
+     bear this in mind and do not add them to backported code.
+
+Features
+   * Add mbedtls_rsa_rsassa_pss_sign_ext() function allowing to generate a
+     signature with a specific salt length. This function allows to validate
+     test cases provided in the NIST's CAVP test suite. Contributed by Cédric
+     Meuter in PR #3183.
+   * Added support for built-in driver keys through the PSA opaque crypto
+     driver interface. Refer to the documentation of
+     MBEDTLS_PSA_CRYPTO_BUILTIN_KEYS for more information.
+   * Implement psa_sign_message() and psa_verify_message().
+   * The new function mbedtls_mpi_random() generates a random value in a
+     given range uniformly.
+   * Implement psa_mac_compute() and psa_mac_verify() as defined in the
+     PSA Cryptograpy API 1.0.0 specification.
+   * MBEDTLS_ECP_MAX_BITS is now determined automatically from the configured
+     curves and no longer needs to be configured explicitly to save RAM.
+
+Security
+   * Fix a bias in the generation of finite-field Diffie-Hellman-Merkle (DHM)
+     private keys and of blinding values for DHM and elliptic curves (ECP)
+     computations. Reported by FlorianF89 in #4245.
+   * Fix a potential side channel vulnerability in ECDSA ephemeral key generation.
+     An adversary who is capable of very precise timing measurements could
+     learn partial information about the leading bits of the nonce used for the
+     signature, allowing the recovery of the private key after observing a
+     large number of signature operations. This completes a partial fix in
+     Mbed TLS 2.20.0.
+   * It was possible to configure MBEDTLS_ECP_MAX_BITS to a value that is
+     too small, leading to buffer overflows in ECC operations. Fail the build
+     in such a case.
+   * An adversary with access to precise enough information about memory
+     accesses (typically, an untrusted operating system attacking a secure
+     enclave) could recover an RSA private key after observing the victim
+     performing a single private-key operation. Found and reported by
+     Zili KOU, Wenjian HE, Sharad Sinha, and Wei ZHANG.
+   * An adversary with access to precise enough timing information (typically, a
+     co-located process) could recover a Curve25519 or Curve448 static ECDH key
+     after inputting a chosen public key and observing the victim performing the
+     corresponding private-key operation. Found and reported by Leila Batina,
+     Lukas Chmielewski, Björn Haase, Niels Samwel and Peter Schwabe.
+
+Bugfix
+   * Add printf function attributes to mbedtls_debug_print_msg to ensure we
+     get printf format specifier warnings.
+   * Fix premature fopen() call in mbedtls_entropy_write_seed_file which may
+     lead to seed file corruption in the case where the path to the seed file is
+     equal to MBEDTLS_PLATFORM_STD_NV_SEED_FILE. Contributed by Victor
+     Krasnoshchok in #3616.
+   * PSA functions other than psa_open_key now return PSA_ERROR_INVALID_HANDLE
+     rather than PSA_ERROR_DOES_NOT_EXIST for an invalid handle, bringing them
+     in line with version 1.0.0 of the specification. Fix #4162.
+   * PSA functions creating a key now return PSA_ERROR_INVALID_ARGUMENT rather
+     than PSA_ERROR_INVALID_HANDLE when the identifier specified for the key
+     to create is not valid, bringing them in line with version 1.0.0 of the
+     specification. Fix #4271.
+   * Fix some cases in the bignum module where the library constructed an
+     unintended representation of the value 0 which was not processed
+     correctly by some bignum operations. This could happen when
+     mbedtls_mpi_read_string() was called on "-0", or when
+     mbedtls_mpi_mul_mpi() and mbedtls_mpi_mul_int() was called with one of
+     the arguments being negative and the other being 0. Fixes #4643.
+   * Fix a bug in ECDSA that would cause it to fail when the hash is all-bits
+     zero. Fixes #1792
+   * Fix a compilation error when MBEDTLS_ECP_RANDOMIZE_MXZ_ALT is
+     defined. Fixes #4217.
+   * Fix an incorrect error code when parsing a PKCS#8 private key.
+   * In a TLS client, enforce the Diffie-Hellman minimum parameter size
+     set with mbedtls_ssl_conf_dhm_min_bitlen() precisely. Before, the
+     minimum size was rounded down to the nearest multiple of 8.
+   * In library/net_sockets.c, _POSIX_C_SOURCE and _XOPEN_SOURCE are
+     defined to specific values.  If the code is used in a context
+     where these are already defined, this can result in a compilation
+     error.  Instead, assume that if they are defined, the values will
+     be adequate to build Mbed TLS.
+   * The cipher suite TLS-RSA-WITH-CAMELLIA-256-GCM-SHA384 was not available
+     when SHA-1 was disabled and was offered when SHA-1 was enabled but SHA-384
+     was disabled. Fix the dependency. Fixes #4472.
+   * Do not offer SHA384 cipher suites when SHA-384 is disabled. Fixes #4499.
+   * With MBEDTLS_PSA_CRYPTO_C disabled, some functions were getting built
+     nonetheless, resulting in undefined reference errors when building a
+     shared library. Reported by Guillermo Garcia M. in #4411.
+   * Fix test suite code on platforms where int32_t is not int, such as
+     Arm Cortex-M. Fixes #4530.
+   * Fix some issues affecting MBEDTLS_ARIA_ALT implementations: a misplaced
+     directive in a header and a missing initialization in the self-test.
+   * Fix a missing initialization in the Camellia self-test, affecting
+     MBEDTLS_CAMELLIA_ALT implementations.
+   * Restore the ability to configure PSA via Mbed TLS options to support RSA
+     key pair operations but exclude RSA key generation. When MBEDTLS_GENPRIME
+     is not defined PSA will no longer attempt to use mbedtls_rsa_gen_key().
+     Fixes #4512.
+   * Fix a regression introduced in 2.24.0 which broke (D)TLS CBC ciphersuites
+     (when the encrypt-then-MAC extension is not in use) with some ALT
+     implementations of the underlying hash (SHA-1, SHA-256, SHA-384), causing
+     the affected side to wrongly reject valid messages. Fixes #4118.
+   * Remove outdated check-config.h check that prevented implementing the
+     timing module on Mbed OS. Fixes #4633.
+   * Fix PSA_ALG_TLS12_PRF and PSA_ALG_TLS12_PSK_TO_MS being too permissive
+     about missing inputs.
+   * Fix mbedtls_net_poll() and mbedtls_net_recv_timeout() often failing with
+     MBEDTLS_ERR_NET_POLL_FAILED on Windows. Fixes #4465.
+   * Fix a resource leak in a test suite with an alternative AES
+     implementation. Fixes #4176.
+   * Fix a crash in mbedtls_mpi_debug_mpi on a bignum having 0 limbs. This
+     could notably be triggered by setting the TLS debug level to 3 or above
+     and using a Montgomery curve for the key exchange. Reported by lhuang04
+     in #4578. Fixes #4608.
+   * psa_verify_hash() was relying on implementation-specific behavior of
+     mbedtls_rsa_rsassa_pss_verify() and was causing failures in some _ALT
+     implementations. This reliance is now removed. Fixes #3990.
+   * Disallow inputs of length different from the corresponding hash when
+     signing or verifying with PSA_ALG_RSA_PSS (The PSA Crypto API mandates
+     that PSA_ALG_RSA_PSS uses the same hash throughout the algorithm.)
+   * Fix a null pointer dereference when mbedtls_mpi_exp_mod() was called with
+     A=0 represented with 0 limbs. Up to and including Mbed TLS 2.26, this bug
+     could not be triggered by code that constructed A with one of the
+     mbedtls_mpi_read_xxx functions (including in particular TLS code) since
+     those always built an mpi object with at least one limb.
+     Credit to OSS-Fuzz. Fixes #4641.
+   * Fix mbedtls_mpi_gcd(G,A,B) when the value of B is zero. This had no
+     effect on Mbed TLS's internal use of mbedtls_mpi_gcd(), but may affect
+     applications that call mbedtls_mpi_gcd() directly. Fixes #4642.
+   * The PSA API no longer allows the creation or destruction of keys with a
+     read-only lifetime. The persistence level PSA_KEY_PERSISTENCE_READ_ONLY
+     can now only be used as intended, for keys that cannot be modified through
+     normal use of the API.
+   * When MBEDTLS_PSA_CRYPTO_SPM is enabled, crypto_spe.h was not included
+     in all the right places. Include it from crypto_platform.h, which is
+     the natural place. Fixes #4649.
+   * mbedtls_pk_sign() and mbedtls_pk_verify() and their extended and
+     restartable variants now always honor the specified hash length if
+     nonzero. Before, for RSA, hash_len was ignored in favor of the length of
+     the specified hash algorithm.
+   * Fix which alert is sent in some cases to conform to the
+     applicable RFC: on an invalid Finished message value, an
+     invalid max_fragment_length extension, or an
+     unsupported extension used by the server.
+   * Correct (change from 12 to 13 bytes) the value of the macro describing the
+     maximum nonce length returned by psa_aead_generate_nonce().
+
+Changes
+   * Add extra printf compiler warning flags to builds.
+   * Fix memsan build false positive in x509_crt.c with Clang 11
+   * Fix the setting of the read timeout in the DTLS sample programs.
+   * Remove the AES sample application programs/aes/aescrypt2 which shows
+     bad cryptographic practice. Fix #1906.
+   * Alternative implementations of CMAC may now opt to not support 3DES as a
+     CMAC block cipher, and still pass the CMAC self test.
+   * Remove configs/config-psa-crypto.h, which was identical to the default
+     configuration except for having some extra cryptographic mechanisms
+     enabled and for unintended differences. This configuration was primarily
+     intended to demonstrate the PSA API, and lost most of its usefulness when
+     MBEDTLS_PSA_CRYPTO_C became enabled by default.
+   * When building the test suites with GNU make, invoke python3 or python, not
+     python2, which is no longer supported upstream.
+   * When using session cache based session resumption on the server,
+     double-check that custom session cache implementations return
+     sessions which are consistent with the negotiated ciphersuite
+     and compression method.
+   * Fix build failure on MinGW toolchain when __USE_MING_ANSI_STDIO is on.
+     When that flag is on, standard GNU C printf format specifiers
+     should be used.
+   * Reduce the default value of MBEDTLS_ECP_WINDOW_SIZE. This reduces RAM usage
+     during ECC operations at a negligible performance cost.
+   * mbedtls_mpi_read_binary(), mbedtls_mpi_read_binary_le() and
+     mbedtls_mpi_read_string() now construct an mbedtls_mpi object with 0 limbs
+     when their input has length 0. Note that this is an implementation detail
+     and can change at any time, so this change should be transparent, but it
+     may result in mbedtls_mpi_write_binary() or mbedtls_mpi_write_string()
+     now writing an empty string where it previously wrote one or more
+     zero digits when operating from values constructed with an mpi_read
+     function and some mpi operations.
+   * Implicitly add PSA_KEY_USAGE_SIGN_MESSAGE key usage policy flag when
+     PSA_KEY_USAGE_SIGN_HASH flag is set and PSA_KEY_USAGE_VERIFY_MESSAGE flag
+     when PSA_KEY_USAGE_VERIFY_HASH flag is set. This usage flag extension
+     is also applied when loading a key from storage.
+
+= mbed TLS 2.26.0 branch released 2021-03-08
+
+API changes
+   * Renamed the PSA Crypto API output buffer size macros to bring them in line
+     with version 1.0.0 of the specification.
+   * The API glue function mbedtls_ecc_group_of_psa() now takes the curve size
+     in bits rather than bytes, with an additional flag to indicate if the
+     size may have been rounded up to a whole number of bytes.
+   * Renamed the PSA Crypto API AEAD tag length macros to bring them in line
+     with version 1.0.0 of the specification.
+
+Default behavior changes
+   * In mbedtls_rsa_context objects, the ver field was formerly documented
+     as always 0. It is now reserved for internal purposes and may take
+     different values.
+
+New deprecations
+   * PSA_KEY_EXPORT_MAX_SIZE, PSA_HASH_SIZE, PSA_MAC_FINAL_SIZE,
+     PSA_BLOCK_CIPHER_BLOCK_SIZE, PSA_MAX_BLOCK_CIPHER_BLOCK_SIZE and
+     PSA_ALG_TLS12_PSK_TO_MS_MAX_PSK_LEN have been renamed, and the old names
+     deprecated.
+   * PSA_ALG_AEAD_WITH_DEFAULT_TAG_LENGTH and PSA_ALG_AEAD_WITH_TAG_LENGTH
+     have been renamed, and the old names deprecated.
+
+Features
+   * The PSA crypto subsystem can now use HMAC_DRBG instead of CTR_DRBG.
+     CTR_DRBG is used by default if it is available, but you can override
+     this choice by setting MBEDTLS_PSA_HMAC_DRBG_MD_TYPE at compile time.
+     Fix #3354.
+   * Automatic fallback to a software implementation of ECP when
+     MBEDTLS_ECP_xxx_ALT accelerator hooks are in use can now be turned off
+     through setting the new configuration flag MBEDTLS_ECP_NO_FALLBACK.
+   * The PSA crypto subsystem can now be configured to use less static RAM by
+     tweaking the setting for the maximum amount of keys simultaneously in RAM.
+     MBEDTLS_PSA_KEY_SLOT_COUNT sets the maximum number of volatile keys that
+     can exist simultaneously. It has a sensible default if not overridden.
+   * Partial implementation of the PSA crypto driver interface: Mbed TLS can
+     now use an external random generator instead of the library's own
+     entropy collection and DRBG code. Enable MBEDTLS_PSA_CRYPTO_EXTERNAL_RNG
+     and see the documentation of mbedtls_psa_external_get_random() for details.
+   * Applications using both mbedtls_xxx and psa_xxx functions (for example,
+     applications using TLS and MBEDTLS_USE_PSA_CRYPTO) can now use the PSA
+     random generator with mbedtls_xxx functions. See the documentation of
+     mbedtls_psa_get_random() for details.
+   * In the PSA API, the policy for a MAC or AEAD algorithm can specify a
+     minimum MAC or tag length thanks to the new wildcards
+     PSA_ALG_AT_LEAST_THIS_LENGTH_MAC and
+     PSA_ALG_AEAD_WITH_AT_LEAST_THIS_LENGTH_TAG.
+
+Security
+   * Fix a security reduction in CTR_DRBG when the initial seeding obtained a
+     nonce from entropy. Applications were affected if they called
+     mbedtls_ctr_drbg_set_nonce_len(), if they called
+     mbedtls_ctr_drbg_set_entropy_len() with a size that was 3/2 times the key
+     length, or when the entropy module uses SHA-256 and CTR_DRBG uses AES-256.
+     In such cases, a random nonce was necessary to achieve the advertised
+     security strength, but the code incorrectly used a constant instead of
+     entropy from the nonce.
+     Found by John Stroebel in #3819 and fixed in #3973.
+   * Fix a buffer overflow in mbedtls_mpi_sub_abs() when calculating
+     |A| - |B| where |B| is larger than |A| and has more limbs (so the
+     function should return MBEDTLS_ERR_MPI_NEGATIVE_VALUE). Only
+     applications calling mbedtls_mpi_sub_abs() directly are affected:
+     all calls inside the library were safe since this function is
+     only called with |A| >= |B|. Reported by Guido Vranken in #4042.
+   * Fix an errorneous estimation for an internal buffer in
+     mbedtls_pk_write_key_pem(). If MBEDTLS_MPI_MAX_SIZE is set to an odd
+     value the function might fail to write a private RSA keys of the largest
+     supported size.
+     Found by Daniel Otte, reported in #4093 and fixed in #4094.
+   * Fix a stack buffer overflow with mbedtls_net_poll() and
+     mbedtls_net_recv_timeout() when given a file descriptor that is
+     beyond FD_SETSIZE. Reported by FigBug in #4169.
+   * Guard against strong local side channel attack against base64 tables by
+     making access aceess to them use constant flow code.
+
+Bugfix
+   * Fix use-after-scope error in programs/ssl/ssl_client2.c and ssl_server2.c
+   * Fix memory leak that occured when calling psa_close_key() on a
+     wrapped key with MBEDTLS_PSA_CRYPTO_SE_C defined.
+   * Fix an incorrect error code if an RSA private operation glitched.
+   * Fix a memory leak in an error case in psa_generate_derived_key_internal().
+   * Fix a resource leak in CTR_DRBG and HMAC_DRBG when MBEDTLS_THREADING_C
+     is enabled, on platforms where initializing a mutex allocates resources.
+     This was a regression introduced in the previous release. Reported in
+     #4017, #4045 and #4071.
+   * Ensure that calling mbedtls_rsa_free() or mbedtls_entropy_free()
+     twice is safe. This happens for RSA when some Mbed TLS library functions
+     fail. Such a double-free was not safe when MBEDTLS_THREADING_C was
+     enabled on platforms where freeing a mutex twice is not safe.
+   * Fix a resource leak in a bad-arguments case of mbedtls_rsa_gen_key()
+     when MBEDTLS_THREADING_C is enabled on platforms where initializing
+     a mutex allocates resources.
+   * Fixes a bug where, if the library was configured to include support for
+     both the old SE interface and the new PSA driver interface, external keys were
+     not loaded from storage. This was fixed by #3996.
+   * This change makes 'mbedtls_x509write_crt_set_basic_constraints'
+     consistent with RFC 5280 4.2.1.9 which says: "Conforming CAs MUST
+     include this extension in all CA certificates that contain public keys
+     used to validate digital signatures on certificates and MUST mark the
+     extension as critical in such certificates." Previous to this change,
+     the extension was always marked as non-critical. This was fixed by
+     #3698.
+
+Changes
+   * A new library C file psa_crypto_client.c has been created to contain
+     the PSA code needed by a PSA crypto client when the PSA crypto
+     implementation is not included into the library.
+   * On recent enough versions of FreeBSD and DragonFlyBSD, the entropy module
+     now uses the getrandom syscall instead of reading from /dev/urandom.
+
+= mbed TLS 2.25.0 branch released 2020-12-11
+
+API changes
+   * The numerical values of the PSA Crypto API macros have been updated to
+     conform to version 1.0.0 of the specification.
+   * PSA_ALG_STREAM_CIPHER replaces PSA_ALG_CHACHA20 and PSA_ALG_ARC4.
+     The underlying stream cipher is determined by the key type
+     (PSA_KEY_TYPE_CHACHA20 or PSA_KEY_TYPE_ARC4).
+   * The functions mbedtls_cipher_auth_encrypt() and
+     mbedtls_cipher_auth_decrypt() no longer accept NIST_KW contexts,
+     as they have no way to check if the output buffer is large enough.
+     Please use mbedtls_cipher_auth_encrypt_ext() and
+     mbedtls_cipher_auth_decrypt_ext() instead. Credit to OSS-Fuzz and
+     Cryptofuzz. Fixes #3665.
+
+Requirement changes
+   * Update the minimum required CMake version to 2.8.12.  This silences a
+     warning on CMake 3.19.0. #3801
+
+New deprecations
+   * PSA_ALG_CHACHA20 and PSA_ALG_ARC4 have been deprecated.
+     Use PSA_ALG_STREAM_CIPHER instead.
+   * The functions mbedtls_cipher_auth_encrypt() and
+     mbedtls_cipher_auth_decrypt() are deprecated in favour of the new
+     functions mbedtls_cipher_auth_encrypt_ext() and
+     mbedtls_cipher_auth_decrypt_ext(). Please note that with AEAD ciphers,
+     these new functions always append the tag to the ciphertext, and include
+     the tag in the ciphertext length.
+
+Features
+   * Partial implementation of the new PSA Crypto accelerator APIs. (Symmetric
+     ciphers, asymmetric signing/verification and key generation, validate_key
+     entry point, and export_public_key interface.)
+   * Add support for ECB to the PSA cipher API.
+   * In PSA, allow using a key declared with a base key agreement algorithm
+     in combined key agreement and derivation operations, as long as the key
+     agreement algorithm in use matches the algorithm the key was declared with.
+     This is currently non-standard behaviour, but expected to make it into a
+     future revision of the PSA Crypto standard.
+   * Add MBEDTLS_TARGET_PREFIX CMake variable, which is prefixed to the mbedtls,
+     mbedcrypto, mbedx509 and apidoc CMake target names. This can be used by
+     external CMake projects that include this one to avoid CMake target name
+     clashes.  The default value of this variable is "", so default target names
+     are unchanged.
+   * Add support for DTLS-SRTP as defined in RFC 5764. Contributed by Johan
+     Pascal, improved by Ron Eldor.
+   * In the PSA API, it is no longer necessary to open persistent keys:
+     operations now accept the key identifier. The type psa_key_handle_t is now
+     identical to psa_key_id_t instead of being platform-defined. This bridges
+     the last major gap to compliance with the PSA Cryptography specification
+     version 1.0.0. Opening persistent keys is still supported for backward
+     compatibility, but will be deprecated and later removed in future
+     releases.
+   * PSA_AEAD_NONCE_LENGTH, PSA_AEAD_NONCE_MAX_SIZE, PSA_CIPHER_IV_LENGTH and
+     PSA_CIPHER_IV_MAX_SIZE macros have been added as defined in version
+     1.0.0 of the PSA Crypto API specification.
+
+Security
+   * The functions mbedtls_cipher_auth_encrypt() and
+     mbedtls_cipher_auth_decrypt() would write past the minimum documented
+     size of the output buffer when used with NIST_KW. As a result, code using
+     those functions as documented with NIST_KW could have a buffer overwrite
+     of up to 15 bytes, with consequences ranging up to arbitrary code
+     execution depending on the location of the output buffer.
+   * Limit the size of calculations performed by mbedtls_mpi_exp_mod to
+     MBEDTLS_MPI_MAX_SIZE to prevent a potential denial of service when
+     generating Diffie-Hellman key pairs. Credit to OSS-Fuzz.
+   * A failure of the random generator was ignored in mbedtls_mpi_fill_random(),
+     which is how most uses of randomization in asymmetric cryptography
+     (including key generation, intermediate value randomization and blinding)
+     are implemented. This could cause failures or the silent use of non-random
+     values. A random generator can fail if it needs reseeding and cannot not
+     obtain entropy, or due to an internal failure (which, for Mbed TLS's own
+     CTR_DRBG or HMAC_DRBG, can only happen due to a misconfiguration).
+   * Fix a compliance issue whereby we were not checking the tag on the
+     algorithm parameters (only the size) when comparing the signature in the
+     description part of the cert to the real signature. This meant that a
+     NULL algorithm parameters entry would look identical to an array of REAL
+     (size zero) to the library and thus the certificate would be considered
+     valid. However, if the parameters do not match in *any* way then the
+     certificate should be considered invalid, and indeed OpenSSL marks these
+     certs as invalid when mbedtls did not.
+     Many thanks to guidovranken who found this issue via differential fuzzing
+     and reported it in #3629.
+   * Zeroising of local buffers and variables which are used for calculations
+     in mbedtls_pkcs5_pbkdf2_hmac(), mbedtls_internal_sha*_process(),
+     mbedtls_internal_md*_process() and mbedtls_internal_ripemd160_process()
+     functions to erase sensitive data from memory. Reported by
+     Johan Malmgren and Johan Uppman Bruce from Sectra.
+
+Bugfix
+   * Fix an invalid (but non-zero) return code from mbedtls_pk_parse_subpubkey()
+     when the input has trailing garbage. Fixes #2512.
+   * Fix build failure in configurations where MBEDTLS_USE_PSA_CRYPTO is
+     enabled but ECDSA is disabled. Contributed by jdurkop. Fixes #3294.
+   * Include the psa_constant_names generated source code in the source tree
+     instead of generating it at build time. Fixes #3524.
+   * Fix rsa_prepare_blinding() to retry when the blinding value is not
+     invertible (mod N), instead of returning MBEDTLS_ERR_RSA_RNG_FAILED. This
+     addresses a regression but is rare in practice (approx. 1 in 2/sqrt(N)).
+     Found by Synopsys Coverity, fix contributed by Peter Kolbus (Garmin).
+     Fixes #3647.
+   * Use socklen_t on Android and other POSIX-compliant system
+   * Fix the build when the macro _GNU_SOURCE is defined to a non-empty value.
+     Fix #3432.
+   * Consistently return PSA_ERROR_INVALID_ARGUMENT on invalid cipher input
+     sizes (instead of PSA_ERROR_BAD_STATE in some cases) to make the
+     psa_cipher_* functions compliant with the PSA Crypto API specification.
+   * mbedtls_ecp_curve_list() now lists Curve25519 and Curve448 under the names
+     "x25519" and "x448". These curves support ECDH but not ECDSA. If you need
+     only the curves that support ECDSA, filter the list with
+     mbedtls_ecdsa_can_do().
+   * Fix psa_generate_key() returning an error when asked to generate
+     an ECC key pair on Curve25519 or secp244k1.
+   * Fix psa_key_derivation_output_key() to allow the output of a combined key
+     agreement and subsequent key derivation operation to be used as a key
+     inside of the PSA Crypto core.
+   * Fix handling of EOF against 0xff bytes and on platforms with unsigned
+     chars. Fixes a build failure on platforms where char is unsigned. Fixes
+     #3794.
+   * Fix an off-by-one error in the additional data length check for
+     CCM, which allowed encryption with a non-standard length field.
+     Fixes #3719.
+   * Correct the default IV size for mbedtls_cipher_info_t structures using
+     MBEDTLS_MODE_ECB to 0, since ECB mode ciphers don't use IVs.
+   * Make arc4random_buf available on NetBSD and OpenBSD when _POSIX_C_SOURCE is
+     defined. Fix contributed in #3571.
+   * Fix conditions for including string.h in error.c. Fixes #3866.
+   * psa_set_key_id() now also sets the lifetime to persistent for keys located
+     in a secure element.
+   * Attempting to create a volatile key with a non-zero key identifier now
+     fails. Previously the key identifier was just ignored when creating a
+     volatile key.
+   * Attempting to create or register a key with a key identifier in the vendor
+     range now fails.
+   * Fix build failures on GCC 11. Fixes #3782.
+   * Add missing arguments of debug message in mbedtls_ssl_decrypt_buf.
+   * Fix a memory leak in mbedtls_mpi_sub_abs() when the result was negative
+     (an error condition) and the second operand was aliased to the result.
+   * Fix a case in elliptic curve arithmetic where an out-of-memory condition
+     could go undetected, resulting in an incorrect result.
+   * In CTR_DRBG and HMAC_DRBG, don't reset the reseed interval in seed().
+     Fixes #2927.
+   * In PEM writing functions, fill the trailing part of the buffer with null
+     bytes. This guarantees that the corresponding parsing function can read
+     the buffer back, which was the case for mbedtls_x509write_{crt,csr}_pem
+     until this property was inadvertently broken in Mbed TLS 2.19.0.
+     Fixes #3682.
+   * Fix a build failure that occurred with the MBEDTLS_AES_SETKEY_DEC_ALT
+     option on. In this configuration key management methods that are required
+     for MBEDTLS_CIPHER_MODE_XTS were excluded from the build and made it fail.
+     Fixes #3818. Reported by John Stroebel.
+
+Changes
+   * Reduce stack usage significantly during sliding window exponentiation.
+     Reported in #3591 and fix contributed in #3592 by Daniel Otte.
+   * The PSA persistent storage format is updated to always store the key bits
+     attribute. No automatic upgrade path is provided. Previously stored keys
+     must be erased, or manually upgraded based on the key storage format
+     specification (docs/architecture/mbed-crypto-storage-specification.md).
+     Fixes #3740.
+   * Remove the zeroization of a pointer variable in AES rounds. It was valid
+     but spurious and misleading since it looked like a mistaken attempt to
+     zeroize the pointed-to buffer. Reported by Antonio de la Piedra, CEA
+     Leti, France.
+
+= mbed TLS 2.24.0 branch released 2020-09-01
+
+API changes
+   * In the PSA API, rename the types of elliptic curve and Diffie-Hellman
+     group families to psa_ecc_family_t and psa_dh_family_t, in line with the
+     PSA Crypto API specification version 1.0.0.
+     Rename associated macros as well:
+     PSA_ECC_CURVE_xxx renamed to PSA_ECC_FAMILY_xxx
+     PSA_DH_GROUP_xxx renamed to PSA_DH_FAMILY_xxx
+     PSA_KEY_TYPE_GET_CURVE renamed to to PSA_KEY_TYPE_ECC_GET_FAMILY
+     PSA_KEY_TYPE_GET_GROUP renamed to PSA_KEY_TYPE_DH_GET_FAMILY
+
+Default behavior changes
+   * Stop storing persistent information about externally stored keys created
+     through PSA Crypto with a volatile lifetime. Reported in #3288 and
+     contributed by Steven Cooreman in #3382.
+
+Features
+   * The new function mbedtls_ecp_write_key() exports private ECC keys back to
+     a byte buffer. It is the inverse of the existing mbedtls_ecp_read_key().
+   * Support building on e2k (Elbrus) architecture: correctly enable
+     -Wformat-signedness, and fix the code that causes signed-one-bit-field
+     and sign-compare warnings. Contributed by makise-homura (Igor Molchanov)
+     <akemi_homura@kurisa.ch>.
+
+Security
+   * Fix a vulnerability in the verification of X.509 certificates when
+     matching the expected common name (the cn argument of
+     mbedtls_x509_crt_verify()) with the actual certificate name: when the
+     subjecAltName extension is present, the expected name was compared to any
+     name in that extension regardless of its type. This means that an
+     attacker could for example impersonate a 4-bytes or 16-byte domain by
+     getting a certificate for the corresponding IPv4 or IPv6 (this would
+     require the attacker to control that IP address, though). Similar attacks
+     using other subjectAltName name types might be possible. Found and
+     reported by kFYatek in #3498.
+   * When checking X.509 CRLs, a certificate was only considered as revoked if
+     its revocationDate was in the past according to the local clock if
+     available. In particular, on builds without MBEDTLS_HAVE_TIME_DATE,
+     certificates were never considered as revoked. On builds with
+     MBEDTLS_HAVE_TIME_DATE, an attacker able to control the local clock (for
+     example, an untrusted OS attacking a secure enclave) could prevent
+     revocation of certificates via CRLs. Fixed by no longer checking the
+     revocationDate field, in accordance with RFC 5280. Reported by
+     yuemonangong in #3340. Reported independently and fixed by
+     Raoul Strackx and Jethro Beekman in #3433.
+   * In (D)TLS record decryption, when using a CBC ciphersuites without the
+     Encrypt-then-Mac extension, use constant code flow memory access patterns
+     to extract and check the MAC. This is an improvement to the existing
+     countermeasure against Lucky 13 attacks. The previous countermeasure was
+     effective against network-based attackers, but less so against local
+     attackers. The new countermeasure defends against local attackers, even
+     if they have access to fine-grained measurements. In particular, this
+     fixes a local Lucky 13 cache attack found and reported by Tuba Yavuz,
+     Farhaan Fowze, Ken (Yihan) Bai, Grant Hernandez, and Kevin Butler
+     (University of Florida) and Dave Tian (Purdue University).
+   * Fix side channel in RSA private key operations and static (finite-field)
+     Diffie-Hellman. An adversary with precise enough timing and memory access
+     information (typically an untrusted operating system attacking a secure
+     enclave) could bypass an existing counter-measure (base blinding) and
+     potentially fully recover the private key.
+   * Fix a 1-byte buffer overread in mbedtls_x509_crl_parse_der().
+     Credit to OSS-Fuzz for detecting the problem and to Philippe Antoine
+     for pinpointing the problematic code.
+   * Zeroising of plaintext buffers in mbedtls_ssl_read() to erase unused
+     application data from memory. Reported in #689 by
+     Johan Uppman Bruce of Sectra.
+
+Bugfix
+   * Library files installed after a CMake build no longer have execute
+     permission.
+   * Use local labels in mbedtls_padlock_has_support() to fix an invalid symbol
+     redefinition if the function is inlined.
+     Reported in #3451 and fix contributed in #3452 by okhowang.
+   * Fix the endianness of Curve25519 keys imported/exported through the PSA
+     APIs. psa_import_key and psa_export_key will now correctly expect/output
+     Montgomery keys in little-endian as defined by RFC7748. Contributed by
+     Steven Cooreman in #3425.
+   * Fix build errors when the only enabled elliptic curves are Montgomery
+     curves. Raised by signpainter in #941 and by Taiki-San in #1412. This
+     also fixes missing declarations reported by Steven Cooreman in #1147.
+   * Fix self-test failure when the only enabled short Weierstrass elliptic
+     curve is secp192k1. Fixes #2017.
+   * PSA key import will now correctly import a Curve25519/Curve448 public key
+     instead of erroring out. Contributed by Steven Cooreman in #3492.
+   * Use arc4random_buf on NetBSD instead of rand implementation with cyclical
+     lower bits. Fix contributed in #3540.
+   * Fix a memory leak in mbedtls_md_setup() when using HMAC under low memory
+     conditions. Reported and fix suggested by Guido Vranken in #3486.
+   * Fix bug in redirection of unit test outputs on platforms where stdout is
+     defined as a macro. First reported in #2311 and fix contributed in #3528.
+
+Changes
+   * Only pass -Wformat-signedness to versions of GCC that support it. Reported
+     in #3478 and fix contributed in #3479 by okhowang.
+   * Reduce the stack consumption of mbedtls_x509write_csr_der() which
+     previously could lead to stack overflow on constrained devices.
+     Contributed by Doru Gucea and Simon Leet in #3464.
+   * Undefine the ASSERT macro before defining it locally, in case it is defined
+     in a platform header. Contributed by Abdelatif Guettouche in #3557.
+   * Update copyright notices to use Linux Foundation guidance. As a result,
+     the copyright of contributors other than Arm is now acknowledged, and the
+     years of publishing are no longer tracked in the source files. This also
+     eliminates the need for the lines declaring the files to be part of
+     MbedTLS. Fixes #3457.
+   * Add the command line parameter key_pwd to the ssl_client2 and ssl_server2
+     example applications which allows to provide a password for the key file
+     specified through the existing key_file argument. This allows the use of
+     these applications with password-protected key files. Analogously but for
+     ssl_server2 only, add the command line parameter key_pwd2 which allows to
+     set a password for the key file provided through the existing key_file2
+     argument.
+
+= mbed TLS 2.23.0 branch released 2020-07-01
+
+Default behavior changes
+   * In the experimental PSA secure element interface, change the encoding of
+     key lifetimes to encode a persistence level and the location. Although C
+     prototypes do not effectively change, code calling
+     psa_register_se_driver() must be modified to pass the driver's location
+     instead of the keys' lifetime. If the library is upgraded on an existing
+     device, keys created with the old lifetime value will not be readable or
+     removable through Mbed TLS after the upgrade.
+
+Features
+   * New functions in the error module return constant strings for
+     high- and low-level error codes, complementing mbedtls_strerror()
+     which constructs a string for any error code, including compound
+     ones, but requires a writable buffer. Contributed by Gaurav Aggarwal
+     in #3176.
+   * The new utility programs/ssl/ssl_context_info prints a human-readable
+     dump of an SSL context saved with mbedtls_ssl_context_save().
+   * Add support for midipix, a POSIX layer for Microsoft Windows.
+   * Add new mbedtls_x509_crt_parse_der_with_ext_cb() routine which allows
+     parsing unsupported certificate extensions via user provided callback.
+     Contributed by Nicola Di Lieto <nicola.dilieto@gmail.com> in #3243 as
+     a solution to #3241.
+   * Pass the "certificate policies" extension to the callback supplied to
+     mbedtls_x509_crt_parse_der_with_ext_cb() if it contains unsupported
+     policies (#3419).
+   * Added support to entropy_poll for the kern.arandom syscall supported on
+     some BSD systems. Contributed by Nia Alarie in #3423.
+   * Add support for Windows 2000 in net_sockets. Contributed by opatomic. #3239
+
+Security
+   * Fix a side channel vulnerability in modular exponentiation that could
+     reveal an RSA private key used in a secure enclave. Noticed by Sangho Lee,
+     Ming-Wei Shih, Prasun Gera, Taesoo Kim and Hyesoon Kim (Georgia Institute
+     of Technology); and Marcus Peinado (Microsoft Research). Reported by Raoul
+     Strackx (Fortanix) in #3394.
+   * Fix side channel in mbedtls_ecp_check_pub_priv() and
+     mbedtls_pk_parse_key() / mbedtls_pk_parse_keyfile() (when loading a
+     private key that didn't include the uncompressed public key), as well as
+     mbedtls_ecp_mul() / mbedtls_ecp_mul_restartable() when called with a NULL
+     f_rng argument. An attacker with access to precise enough timing and
+     memory access information (typically an untrusted operating system
+     attacking a secure enclave) could fully recover the ECC private key.
+     Found and reported by Alejandro Cabrera Aldaya and Billy Brumley.
+   * Fix issue in Lucky 13 counter-measure that could make it ineffective when
+     hardware accelerators were used (using one of the MBEDTLS_SHAxxx_ALT
+     macros). This would cause the original Lucky 13 attack to be possible in
+     those configurations, allowing an active network attacker to recover
+     plaintext after repeated timing measurements under some conditions.
+     Reported and fix suggested by Luc Perneel in #3246.
+
+Bugfix
+   * Fix the Visual Studio Release x64 build configuration for mbedtls itself.
+     Completes a previous fix in Mbed TLS 2.19 that only fixed the build for
+     the example programs. Reported in #1430 and fix contributed by irwir.
+   * Fix undefined behavior in X.509 certificate parsing if the
+     pathLenConstraint basic constraint value is equal to INT_MAX.
+     The actual effect with almost every compiler is the intended
+     behavior, so this is unlikely to be exploitable anywhere. #3192
+   * Fix issue with a detected HW accelerated record error not being exposed
+     due to shadowed variable. Contributed by Sander Visser in #3310.
+   * Avoid NULL pointer dereferencing if mbedtls_ssl_free() is called with a
+     NULL pointer argument. Contributed by Sander Visser in #3312.
+   * Fix potential linker errors on dual world platforms by inlining
+     mbedtls_gcc_group_to_psa(). This allows the pk.c module to link separately
+     from psa_crypto.c. Fixes #3300.
+   * Remove dead code in X.509 certificate parsing. Contributed by irwir in
+     #2855.
+   * Include asn1.h in error.c. Fixes #3328 reported by David Hu.
+   * Fix potential memory leaks in ecp_randomize_jac() and ecp_randomize_mxz()
+     when PRNG function fails. Contributed by Jonas Lejeune in #3318.
+   * Remove unused macros from MSVC projects. Reported in #3297 and fix
+     submitted in #3333 by irwir.
+   * Add additional bounds checks in ssl_write_client_hello() preventing
+     output buffer overflow if the configuration declared a buffer that was
+     too small.
+   * Set _POSIX_C_SOURCE to at least 200112L in C99 code. Reported in #3420 and
+     fix submitted in #3421 by Nia Alarie.
+   * Fix building library/net_sockets.c and the ssl_mail_client program on
+     NetBSD. Contributed by Nia Alarie in #3422.
+   * Fix false positive uninitialised variable reported by cpp-check.
+     Contributed by Sander Visser in #3311.
+   * Update iv and len context pointers manually when reallocating buffers
+     using the MBEDTLS_SSL_VARIABLE_BUFFER_LENGTH feature. This caused issues
+     when receiving a connection with CID, when these fields were shifted
+     in ssl_parse_record_header().
+
+Changes
+   * Fix warnings about signedness issues in format strings. The build is now
+     clean of -Wformat-signedness warnings. Contributed by Kenneth Soerensen
+     in #3153.
+   * Fix minor performance issue in operations on Curve25519 caused by using a
+     suboptimal modular reduction in one place. Found and fix contributed by
+     Aurelien Jarno in #3209.
+   * Combine identical cases in switch statements in md.c. Contributed
+     by irwir in #3208.
+   * Simplify a bounds check in ssl_write_certificate_request(). Contributed
+     by irwir in #3150.
+   * Unify the example programs termination to call mbedtls_exit() instead of
+     using a return command. This has been done to enable customization of the
+     behavior in bare metal environments.
+   * Fix mbedtls_x509_dn_gets to escape non-ASCII characters as "?".
+     Contributed by Koh M. Nakagawa in #3326.
+   * Use FindPython3 when cmake version >= 3.15.0
+   * Abort the ClientHello writing function as soon as some extension doesn't
+     fit into the record buffer. Previously, such extensions were silently
+     dropped. As a consequence, the TLS handshake now fails when the output
+     buffer is not large enough to hold the ClientHello.
+   * The unit tests now rely on header files in tests/include/test and source
+     files in tests/src. When building with make or cmake, the files in
+     tests/src are compiled and the resulting object linked into each test
+     executable.
+   * The ECP module, enabled by `MBEDTLS_ECP_C`, now depends on
+     `MBEDTLS_CTR_DRBG_C` or `MBEDTLS_HMAC_DRBG_C` for some side-channel
+     coutermeasures. If side channels are not a concern, this dependency can
+     be avoided by enabling the new option `MBEDTLS_ECP_NO_INTERNAL_RNG`.
+   * Align MSVC error flag with GCC and Clang. Contributed by Carlos Gomes
+     Martinho. #3147
+   * Remove superfluous assignment in mbedtls_ssl_parse_certificate(). Reported
+     in #3182 and fix submitted by irwir. #3217
+   * Fix typo in XTS tests. Reported and fix submitted by Kxuan. #3319
+
+= mbed TLS 2.22.0 branch released 2020-04-14
+
+New deprecations
+   * Deprecate MBEDTLS_SSL_HW_RECORD_ACCEL that enables function hooks in the
+     SSL module for hardware acceleration of individual records.
+   * Deprecate mbedtls_ssl_get_max_frag_len() in favour of
+     mbedtls_ssl_get_output_max_frag_len() and
+     mbedtls_ssl_get_input_max_frag_len() to be more precise about which max
+     fragment length is desired.
+
+Security
+   * Fix issue in DTLS handling of new associations with the same parameters
+     (RFC 6347 section 4.2.8): an attacker able to send forged UDP packets to
+     the server could cause it to drop established associations with
+     legitimate clients, resulting in a Denial of Service. This could only
+     happen when MBEDTLS_SSL_DTLS_CLIENT_PORT_REUSE was enabled in config.h
+     (which it is by default).
+   * Fix side channel in ECC code that allowed an adversary with access to
+     precise enough timing and memory access information (typically an
+     untrusted operating system attacking a secure enclave) to fully recover
+     an ECDSA private key. Found and reported by Alejandro Cabrera Aldaya,
+     Billy Brumley and Cesar Pereida Garcia. CVE-2020-10932
+   * Fix a potentially remotely exploitable buffer overread in a
+     DTLS client when parsing the Hello Verify Request message.
+
+Features
+   * The new build option MBEDTLS_SSL_VARIABLE_BUFFER_LENGTH automatically
+     resizes the I/O buffers before and after handshakes, reducing the memory
+     consumption during application data transfer.
+
+Bugfix
+   * Fix compilation failure when both MBEDTLS_SSL_PROTO_DTLS and
+     MBEDTLS_SSL_HW_RECORD_ACCEL are enabled.
+   * Remove a spurious check in ssl_parse_client_psk_identity that triggered
+     a warning with some compilers. Fix contributed by irwir in #2856.
+   * Fix a function name in a debug message. Contributed by Ercan Ozturk in
+     #3013.
+
+Changes
+   * Mbed Crypto is no longer a Git submodule. The crypto part of the library
+     is back directly in the present repository.
+   * Split mbedtls_ssl_get_max_frag_len() into
+     mbedtls_ssl_get_output_max_frag_len() and
+     mbedtls_ssl_get_input_max_frag_len() to ensure that a sufficient input
+     buffer is allocated by the server (if MBEDTLS_SSL_VARIABLE_BUFFER_LENGTH
+     is defined), regardless of what MFL was configured for it.
+
+= mbed TLS 2.21.0 branch released 2020-02-20
+
+New deprecations
+   * Deprecate MBEDTLS_SSL_SRV_SUPPORT_SSLV2_CLIENT_HELLO that enables parsing
+     SSLv2 ClientHello messages.
+   * Deprecate MBEDTLS_SSL_PROTO_SSL3 that enables support for SSLv3.
+   * Deprecate for MBEDTLS_PKCS11_C, the wrapper around the pkcs11-helper
+     library which allows TLS authentication to use keys stored in a
+     PKCS#11 token such as a smartcard.
+
+Security
+   * Fix potential memory overread when performing an ECDSA signature
+     operation. The overread only happens with cryptographically low
+     probability (of the order of 2^-n where n is the bitsize of the curve)
+     unless the RNG is broken, and could result in information disclosure or
+     denial of service (application crash or extra resource consumption).
+     Found by Auke Zeilstra and Peter Schwabe, using static analysis.
+   * To avoid a side channel vulnerability when parsing an RSA private key,
+     read all the CRT parameters from the DER structure rather than
+     reconstructing them. Found by Alejandro Cabrera Aldaya and Billy Bob
+     Brumley. Reported and fix contributed by Jack Lloyd.
+     ARMmbed/mbed-crypto#352
+
+Features
+   * The new build option MBEDTLS_SHA512_NO_SHA384 allows building SHA-512
+     support without SHA-384.
+
+API changes
+   * Change the encoding of key types and curves in the PSA API. The new
+     values are aligned with the upcoming release of the PSA Crypto API
+     specification version 1.0.0. The main change which may break some
+     existing code is that elliptic curve key types no longer encode the
+     exact curve: a psa_ecc_curve_t or psa_key_type_t value only encodes
+     a curve family and the key size determines the exact curve (for example,
+     PSA_ECC_CURVE_SECP_R1 with 256 bits is P256R1). ARMmbed/mbed-crypto#330
+
+Bugfix
+   * Fix an unchecked call to mbedtls_md() in the x509write module.
+   * Fix build failure with MBEDTLS_ZLIB_SUPPORT enabled. Reported by
+     Jack Lloyd in #2859. Fix submitted by jiblime in #2963.
+   * Fix some false-positive uninitialized variable warnings in X.509. Fix
+     contributed by apple-ihack-geek in #2663.
+   * Fix a possible error code mangling in psa_mac_verify_finish() when
+     a cryptographic accelerator fails. ARMmbed/mbed-crypto#345
+   * Fix a bug in mbedtls_pk_parse_key() that would cause it to accept some
+     RSA keys that would later be rejected by functions expecting private
+     keys. Found by Catena cyber using oss-fuzz (issue 20467).
+   * Fix a bug in mbedtls_pk_parse_key() that would cause it to
+     accept some RSA keys with invalid values by silently fixing those values.
+
+= mbed TLS 2.20.0 branch released 2020-01-15
+
+Default behavior changes
+   * The initial seeding of a CTR_DRBG instance makes a second call to the
+     entropy function to obtain entropy for a nonce if the entropy size is less
+     than 3/2 times the key size. In case you want to disable the extra call to
+     grab entropy, you can call mbedtls_ctr_drbg_set_nonce_len() to force the
+     nonce length to 0.
+
+Security
+   * Enforce that mbedtls_entropy_func() gathers a total of
+     MBEDTLS_ENTROPY_BLOCK_SIZE bytes or more from strong sources. In the
+     default configuration, on a platform with a single entropy source, the
+     entropy module formerly only grabbed 32 bytes, which is good enough for
+     security if the source is genuinely strong, but less than the expected 64
+     bytes (size of the entropy accumulator).
+   * Zeroize local variables in mbedtls_internal_aes_encrypt() and
+     mbedtls_internal_aes_decrypt() before exiting the function. The value of
+     these variables can be used to recover the last round key. To follow best
+     practice and to limit the impact of buffer overread vulnerabilities (like
+     Heartbleed) we need to zeroize them before exiting the function.
+     Issue reported by Tuba Yavuz, Farhaan Fowze, Ken (Yihang) Bai,
+     Grant Hernandez, and Kevin Butler (University of Florida) and
+     Dave Tian (Purdue University).
+   * Fix side channel vulnerability in ECDSA. Our bignum implementation is not
+     constant time/constant trace, so side channel attacks can retrieve the
+     blinded value, factor it (as it is smaller than RSA keys and not guaranteed
+     to have only large prime factors), and then, by brute force, recover the
+     key. Reported by Alejandro Cabrera Aldaya and Billy Brumley.
+   * Fix side channel vulnerability in ECDSA key generation. Obtaining precise
+     timings on the comparison in the key generation enabled the attacker to
+     learn leading bits of the ephemeral key used during ECDSA signatures and to
+     recover the private key. Reported by Jeremy Dubeuf.
+   * Catch failure of AES functions in mbedtls_ctr_drbg_random(). Uncaught
+     failures could happen with alternative implementations of AES. Bug
+     reported and fix proposed by Johan Uppman Bruce and Christoffer Lauri,
+     Sectra.
+
+Features
+   * Key derivation inputs in the PSA API can now either come from a key object
+     or from a buffer regardless of the step type.
+   * The CTR_DRBG module can grab a nonce from the entropy source during the
+     initial seeding. The default nonce length is chosen based on the key size
+     to achieve the security strength defined by NIST SP 800-90A. You can
+     change it with mbedtls_ctr_drbg_set_nonce_len().
+   * Add ENUMERATED tag support to the ASN.1 module. Contributed by
+     msopiha-linaro in ARMmbed/mbed-crypto#307.
+
+API changes
+   * In the PSA API, forbid zero-length keys. To pass a zero-length input to a
+     key derivation function, use a buffer instead (this is now always
+     possible).
+   * Rename psa_asymmetric_sign() to psa_sign_hash() and
+     psa_asymmetric_verify() to psa_verify_hash().
+
+Bugfix
+   * Fix an incorrect size in a debugging message. Reported and fix
+     submitted by irwir. Fixes #2717.
+   * Fix an unused variable warning when compiling without DTLS.
+     Reported and fix submitted by irwir. Fixes #2800.
+   * Remove a useless assignment. Reported and fix submitted by irwir.
+     Fixes #2801.
+   * Fix a buffer overflow in the PSA HMAC code when using a long key with an
+     unsupported algorithm. Fixes ARMmbed/mbed-crypto#254.
+   * Fix mbedtls_asn1_get_int to support any number of leading zeros. Credit
+     to OSS-Fuzz for finding a bug in an intermediate version of the fix.
+   * Fix mbedtls_asn1_get_bitstring_null to correctly parse bitstrings of at
+     most 2 bytes.
+   * mbedtls_ctr_drbg_set_entropy_len() and
+     mbedtls_hmac_drbg_set_entropy_len() now work if you call them before
+     mbedtls_ctr_drbg_seed() or mbedtls_hmac_drbg_seed().
+
+Changes
+   * Remove the technical possibility to define custom mbedtls_md_info
+     structures, which was exposed only in an internal header.
+   * psa_close_key(0) and psa_destroy_key(0) now succeed (doing nothing, as
+     before).
+   * Variables containing error codes are now initialized to an error code
+     rather than success, so that coding mistakes or memory corruption tends to
+     cause functions to return this error code rather than a success. There are
+     no known instances where this changes the behavior of the library: this is
+     merely a robustness improvement. ARMmbed/mbed-crypto#323
+   * Remove a useless call to mbedtls_ecp_group_free(). Contributed by
+     Alexander Krizhanovsky in ARMmbed/mbed-crypto#210.
+   * Speed up PBKDF2 by caching the digest calculation. Contributed by Jack
+     Lloyd and Fortanix Inc in ARMmbed/mbed-crypto#277.
+   * Small performance improvement of mbedtls_mpi_div_mpi(). Contributed by
+     Alexander Krizhanovsky in ARMmbed/mbed-crypto#308.
+
+= mbed TLS 2.19.1 branch released 2019-09-16
+
+Features
+   * Declare include headers as PUBLIC to propagate to CMake project consumers
+     Contributed by Zachary J. Fields in PR #2949.
+   * Add nss_keylog to ssl_client2 and ssl_server2, enabling easier analysis of
+     TLS sessions with tools like Wireshark.
+
+API Changes
+   * Make client_random and server_random const in
+     mbedtls_ssl_export_keys_ext_t, so that the key exporter is discouraged
+     from modifying the client/server hello.
+
+Bugfix
+   * Fix some false-positive uninitialized variable warnings in crypto. Fix
+     contributed by apple-ihack-geek in #2663.
+
+= mbed TLS 2.19.0 branch released 2019-09-06
+
+Security
+   * Fix a missing error detection in ECJPAKE. This could have caused a
+     predictable shared secret if a hardware accelerator failed and the other
+     side of the key exchange had a similar bug.
+   * When writing a private EC key, use a constant size for the private
+     value, as specified in RFC 5915. Previously, the value was written
+     as an ASN.1 INTEGER, which caused the size of the key to leak
+     about 1 bit of information on average and could cause the value to be
+     1 byte too large for the output buffer.
+   * The deterministic ECDSA calculation reused the scheme's HMAC-DRBG to
+     implement blinding. Because of this for the same key and message the same
+     blinding value was generated. This reduced the effectiveness of the
+     countermeasure and leaked information about the private key through side
+     channels. Reported by Jack Lloyd.
+
+Features
+   * Add new API functions mbedtls_ssl_session_save() and
+     mbedtls_ssl_session_load() to allow serializing a session, for example to
+     store it in non-volatile storage, and later using it for TLS session
+     resumption.
+   * Add a new API function mbedtls_ssl_check_record() to allow checking that
+     an incoming record is valid, authentic and has not been seen before. This
+     feature can be used alongside Connection ID and SSL context serialisation.
+     The feature is enabled at compile-time by MBEDTLS_SSL_RECORD_CHECKING
+     option.
+   * New implementation of X25519 (ECDH using Curve25519) from Project Everest
+     (https://project-everest.github.io/). It can be enabled at compile time
+     with MBEDTLS_ECDH_VARIANT_EVEREST_ENABLED. This implementation is formally
+     verified and significantly faster, but is only supported on x86 platforms
+     (32-bit and 64-bit) using GCC, Clang or Visual Studio. Contributed by
+     Christoph Wintersteiger from Microsoft Research.
+   * Add mbedtls_net_close(), enabling the building of forking servers where
+     the parent process closes the client socket and continue accepting, and
+     the child process closes the listening socket and handles the client
+     socket. Contributed by Robert Larsen in #2803.
+
+API Changes
+   * Add DER-encoded test CRTs to library/certs.c, allowing
+     the example programs ssl_server2 and ssl_client2 to be run
+     if MBEDTLS_FS_IO and MBEDTLS_PEM_PARSE_C are unset. Fixes #2254.
+   * The HAVEGE state type now uses uint32_t elements instead of int.
+   * The functions mbedtls_ecp_curve_list() and mbedtls_ecp_grp_id_list() now
+     list all curves for which at least one of ECDH or ECDSA is supported, not
+     just curves for which both are supported. Call mbedtls_ecdsa_can_do() or
+     mbedtls_ecdh_can_do() on each result to check whether each algorithm is
+     supported.
+   * The new function mbedtls_ecdsa_sign_det_ext() is similar to
+     mbedtls_ecdsa_sign_det() but allows passing an external RNG for the
+     purpose of blinding.
+
+New deprecations
+   * Deprecate mbedtls_ecdsa_sign_det() in favor of a functions that can take an
+     RNG function as an input.
+   * Calling mbedtls_ecdsa_write_signature() with NULL as the f_rng argument
+     is now deprecated.
+
+Bugfix
+   * Fix missing bounds checks in X.509 parsing functions that could
+     lead to successful parsing of ill-formed X.509 CRTs. Fixes #2437.
+   * Fix multiple X.509 functions previously returning ASN.1 low-level error
+     codes to always wrap these codes into X.509 high level error codes before
+     returning. Fixes #2431.
+   * Fix to allow building test suites with any warning that detects unused
+     functions. Fixes #1628.
+   * Fix typo in net_would_block(). Fixes #528 reported by github-monoculture.
+   * Remove redundant include file in timing.c. Fixes #2640 reported by irwir.
+   * Fix build failure when building with mingw on Windows by including
+     stdarg.h where needed. Fixes #2656.
+   * Fix Visual Studio Release x64 build configuration by inheriting
+     PlatformToolset from the project configuration. Fixes #1430 reported by
+     irwir.
+   * Enable Suite B with subset of ECP curves. Make sure the code compiles even
+     if some curves are not defined. Fixes #1591 reported by dbedev.
+   * Fix misuse of signed arithmetic in the HAVEGE module. #2598
+   * Avoid use of statically sized stack buffers for certificate writing.
+     This previously limited the maximum size of DER encoded certificates
+     in mbedtls_x509write_crt_der() to 2Kb. Reported by soccerGB in #2631.
+   * Fix partial zeroing in x509_get_other_name. Found and fixed by ekse, #2716.
+   * Update test certificates that were about to expire. Reported by
+     Bernhard M. Wiedemann in #2357.
+   * Fix the build on ARMv5TE in ARM mode to not use assembly instructions
+     that are only available in Thumb mode. Fix contributed by Aurelien Jarno
+     in #2169.
+   * Fix propagation of restart contexts in restartable EC operations.
+     This could previously lead to segmentation faults in builds using an
+     address-sanitizer and enabling but not using MBEDTLS_ECP_RESTARTABLE.
+   * Fix memory leak in in mpi_miller_rabin(). Contributed by
+     Jens Wiklander <jens.wiklander@linaro.org> in #2363
+   * Improve code clarity in x509_crt module, removing false-positive
+     uninitialized variable warnings on some recent toolchains (GCC8, etc).
+     Discovered and fixed by Andy Gross (Linaro), #2392.
+   * Fix bug in endianness conversion in bignum module. This lead to
+     functionally incorrect code on bigendian systems which don't have
+     __BYTE_ORDER__ defined. Reported by Brendan Shanks. Fixes #2622.
+
+Changes
+   * Replace multiple uses of MD2 by SHA-256 in X.509 test suite. Fixes #821.
+   * Make it easier to define MBEDTLS_PARAM_FAILED as assert (which config.h
+     suggests). #2671
+   * Make `make clean` clean all programs always. Fixes #1862.
+   * Add a Dockerfile and helper scripts (all-in-docker.sh, basic-in-docker.sh,
+     docker-env.sh) to simplify running test suites on a Linux host. Contributed
+     by Peter Kolbus (Garmin).
+   * Add `reproducible` option to `ssl_client2` and `ssl_server2` to enable
+     test runs without variability. Contributed by Philippe Antoine (Catena
+     cyber) in #2681.
+   * Extended .gitignore to ignore Visual Studio artifacts. Fixed by ConfusedSushi.
+   * Adds fuzz targets, especially for continuous fuzzing with OSS-Fuzz.
+     Contributed by Philippe Antoine (Catena cyber).
+   * Remove the crypto part of the library from Mbed TLS. The crypto
+     code and tests are now only available via Mbed Crypto, which
+     Mbed TLS references as a Git submodule.
+
+= mbed TLS 2.18.1 branch released 2019-07-12
+
+Bugfix
+   * Fix build failure when building with mingw on Windows by including
+     stdarg.h where needed. Fixes #2656.
+
+Changes
+   * Enable building of Mbed TLS as a CMake subproject. Suggested and fixed by
+     Ashley Duncan in #2609.
+
+= mbed TLS 2.18.0 branch released 2019-06-11
+
+Features
+   * Add the Any Policy certificate policy oid, as defined in
+     rfc 5280 section 4.2.1.4.
+   * It is now possible to use NIST key wrap mode via the mbedtls_cipher API.
+     Contributed by Jack Lloyd and Fortanix Inc.
+   * Add the Wi-SUN Field Area Network (FAN) device extended key usage.
+   * Add the oid certificate policy x509 extension.
+   * It is now possible to perform RSA PKCS v1.5 signatures with RIPEMD-160 digest.
+     Contributed by Jack Lloyd and Fortanix Inc.
+   * Extend the MBEDTLS_SSL_EXPORT_KEYS to export the handshake randbytes,
+     and the used tls-prf.
+   * Add public API for tls-prf function, according to requested enum.
+   * Add support for parsing otherName entries in the Subject Alternative Name
+     X.509 certificate extension, specifically type hardware module name,
+     as defined in RFC 4108 section 5.
+   * Add support for parsing certificate policies extension, as defined in
+     RFC 5280 section 4.2.1.4. Currently, only the "Any Policy" policy is
+     supported.
+   * List all SAN types in the subject_alt_names field of the certificate.
+     Resolves #459.
+   * Add support for draft-05 of the Connection ID extension, as specified
+     in https://tools.ietf.org/html/draft-ietf-tls-dtls-connection-id-05.
+     The Connection ID extension allows to keep DTLS connections beyond the
+     lifetime of the underlying transport by adding a connection identifier
+     to the DTLS record header. This identifier can be used to associated an
+     incoming record with the correct connection data even after the peer has
+     changed its IP or port. The feature is enabled at compile-time by setting
+     MBEDTLS_SSL_DTLS_CONNECTION_ID (disabled by default), and at run-time
+     through the new APIs mbedtls_ssl_conf_cid() and mbedtls_ssl_set_cid().
+
+
+API Changes
+   * Extend the MBEDTLS_SSL_EXPORT_KEYS to export the handshake randbytes,
+     and the used tls-prf.
+   * Add public API for tls-prf function, according to requested enum.
+
+Bugfix
+   * Fix private key DER output in the key_app_writer example. File contents
+     were shifted by one byte, creating an invalid ASN.1 tag. Fixed by
+     Christian Walther in #2239.
+   * Fix potential memory leak in X.509 self test. Found and fixed by
+     Junhwan Park, #2106.
+   * Reduce stack usage of hkdf tests. Fixes #2195.
+   * Fix 1-byte buffer overflow in mbedtls_mpi_write_string() when
+     used with negative inputs. Found by Guido Vranken in #2404. Credit to
+     OSS-Fuzz.
+   * Fix bugs in the AEAD test suite which would be exposed by ciphers which
+     either used both encrypt and decrypt key schedules, or which perform padding.
+     GCM and CCM were not affected. Fixed by Jack Lloyd.
+   * Fix incorrect default port number in ssl_mail_client example's usage.
+     Found and fixed by irwir. #2337
+   * Add psa_util.h to test/cpp_dummy_build to fix build_default_make_gcc_and_cxx.
+     Fixed by Peter Kolbus (Garmin). #2579
+   * Add missing parentheses around parameters in the definition of the
+     public macro MBEDTLS_X509_ID_FLAG. This could lead to invalid evaluation
+     in case operators binding less strongly than subtraction were used
+     for the parameter.
+   * Add a check for MBEDTLS_X509_CRL_PARSE_C in ssl_server2, guarding the crl
+     sni entry parameter. Reported by inestlerode in #560.
+   * Set the next sequence of the subject_alt_name to NULL when deleting
+     sequence on failure. Found and fix suggested by Philippe Antoine.
+     Credit to OSS-Fuzz.
+
+Changes
+   * Server's RSA certificate in certs.c was SHA-1 signed. In the default
+     mbedTLS configuration only SHA-2 signed certificates are accepted.
+     This certificate is used in the demo server programs, which lead the
+     client programs to fail at the peer's certificate verification
+     due to an unacceptable hash signature. The certificate has been
+     updated to one that is SHA-256 signed. Fix contributed by
+     Illya Gerasymchuk.
+   * Return from various debugging routines immediately if the
+     provided SSL context is unset.
+   * Remove dead code from bignum.c in the default configuration.
+     Found by Coverity, reported and fixed by Peter Kolbus (Garmin). Fixes #2309.
+   * Add test for minimal value of MBEDTLS_MPI_WINDOW_SIZE to all.sh.
+     Contributed by Peter Kolbus (Garmin).
+   * Change wording in the `mbedtls_ssl_conf_max_frag_len()`'s documentation to
+     improve clarity. Fixes #2258.
+
+= mbed TLS 2.17.0 branch released 2019-03-19
+
+Features
+   * Add a new X.509 API call `mbedtls_x509_parse_der_nocopy()`
+     which allows copy-less parsing of DER encoded X.509 CRTs,
+     at the cost of additional lifetime constraints on the input
+     buffer, but at the benefit of reduced RAM consumption.
+   * Add a new function mbedtls_asn1_write_named_bitstring() to write ASN.1
+     named bitstring in DER as required by RFC 5280 Appendix B.
+   * Add MBEDTLS_REMOVE_3DES_CIPHERSUITES to allow removing 3DES ciphersuites
+     from the default list (enabled by default). See
+     https://sweet32.info/SWEET32_CCS16.pdf.
+
+API Changes
+   * Add a new X.509 API call `mbedtls_x509_parse_der_nocopy()`.
+     See the Features section for more information.
+   * Allow to opt in to the removal the API mbedtls_ssl_get_peer_cert()
+     for the benefit of saving RAM, by disabling the new compile-time
+     option MBEDTLS_SSL_KEEP_PEER_CERTIFICATE (enabled by default for
+     API stability). Disabling this option makes mbedtls_ssl_get_peer_cert()
+     always return NULL, and removes the peer_cert field from the
+     mbedtls_ssl_session structure which otherwise stores the peer's
+     certificate.
+
+Security
+   * Make mbedtls_ecdh_get_params return an error if the second key
+     belongs to a different group from the first. Before, if an application
+     passed keys that belonged to different group, the first key's data was
+     interpreted according to the second group, which could lead to either
+     an error or a meaningless output from mbedtls_ecdh_get_params. In the
+     latter case, this could expose at most 5 bits of the private key.
+
+Bugfix
+   * Fix a compilation issue with mbedtls_ecp_restart_ctx not being defined
+     when MBEDTLS_ECP_ALT is defined. Reported by jwhui. Fixes #2242.
+   * Run the AD too long test only if MBEDTLS_CCM_ALT is not defined.
+     Raised as a comment in #1996.
+   * Reduce the stack consumption of mbedtls_mpi_fill_random() which could
+     previously lead to a stack overflow on constrained targets.
+   * Add `MBEDTLS_SELF_TEST` for the mbedtls_self_test functions
+     in the header files, which missed the precompilation check. #971
+   * Fix returning the value 1 when mbedtls_ecdsa_genkey failed.
+   * Remove a duplicate #include in a sample program. Fixed by Masashi Honma #2326.
+   * Remove the mbedtls namespacing from the header file, to fix a "file not found"
+     build error. Fixed by Haijun Gu #2319.
+   * Fix signed-to-unsigned integer conversion warning
+     in X.509 module. Fixes #2212.
+   * Reduce stack usage of `mpi_write_hlp()` by eliminating recursion.
+     Fixes #2190.
+   * Fix false failure in all.sh when backup files exist in include/mbedtls
+     (e.g. config.h.bak). Fixed by Peter Kolbus (Garmin) #2407.
+   * Ensure that unused bits are zero when writing ASN.1 bitstrings when using
+     mbedtls_asn1_write_bitstring().
+   * Fix issue when writing the named bitstrings in KeyUsage and NsCertType
+     extensions in CSRs and CRTs that caused these bitstrings to not be encoded
+     correctly as trailing zeroes were not accounted for as unused bits in the
+     leading content octet. Fixes #1610.
+
+Changes
+   * Reduce RAM consumption during session renegotiation by not storing
+     the peer CRT chain and session ticket twice.
+   * Include configuration file in all header files that use configuration,
+     instead of relying on other header files that they include.
+     Inserted as an enhancement for #1371
+   * Add support for alternative CSR headers, as used by Microsoft and defined
+     in RFC 7468. Found by Michael Ernst. Fixes #767.
+   * Correct many misspellings. Fixed by MisterDA #2371.
+   * Provide an abstraction of vsnprintf to allow alternative implementations
+     for platforms that don't provide it. Based on contributions by Joris Aerts
+     and Nathaniel Wesley Filardo.
+   * Fix clobber list in MIPS assembly for large integer multiplication.
+     Previously, this could lead to functionally incorrect assembly being
+     produced by some optimizing compilers, showing up as failures in
+     e.g. RSA or ECC signature operations. Reported in #1722, fix suggested
+     by Aurelien Jarno and submitted by Jeffrey Martin.
+   * Reduce the complexity of the timing tests. They were assuming more than the
+     underlying OS actually guarantees.
+   * Fix configuration queries in ssl-opt.h. #2030
+   * Ensure that ssl-opt.h can be run in OS X. #2029
+   * Re-enable certain interoperability tests in ssl-opt.sh which had previously
+     been disabled for lack of a sufficiently recent version of GnuTLS on the CI.
+   * Ciphersuites based on 3DES now have the lowest priority by default when
+     they are enabled.
+
+= mbed TLS 2.16.0 branch released 2018-12-21
+
+Features
+   * Add a new config.h option of MBEDTLS_CHECK_PARAMS that enables validation
+     of parameters in the API. This allows detection of obvious misuses of the
+     API, such as passing NULL pointers. The API of existing functions hasn't
+     changed, but requirements on parameters have been made more explicit in
+     the documentation. See the corresponding API documentation for each
+     function to see for which parameter values it is defined. This feature is
+     disabled by default. See its API documentation in config.h for additional
+     steps you have to take when enabling it.
+
+API Changes
+   * The following functions in the random generator modules have been
+     deprecated and replaced as shown below. The new functions change
+     the return type from void to int to allow returning error codes when
+     using MBEDTLS_<MODULE>_ALT for the underlying AES or message digest
+     primitive. Fixes #1798.
+     mbedtls_ctr_drbg_update() -> mbedtls_ctr_drbg_update_ret()
+     mbedtls_hmac_drbg_update() -> mbedtls_hmac_drbg_update_ret()
+   * Extend ECDH interface to enable alternative implementations.
+   * Deprecate error codes of the form MBEDTLS_ERR_xxx_INVALID_KEY_LENGTH for
+     ARIA, CAMELLIA and Blowfish. These error codes will be replaced by
+     the more generic per-module error codes MBEDTLS_ERR_xxx_BAD_INPUT_DATA.
+   * Additional parameter validation checks have been added for the following
+     modules - AES, ARIA, Blowfish, CAMELLIA, CCM, GCM, DHM, ECP, ECDSA, ECDH,
+     ECJPAKE, SHA, Chacha20 and Poly1305, cipher, pk, RSA, and MPI.
+     Where modules have had parameter validation added, existing parameter
+     checks may have changed. Some modules, such as Chacha20 had existing
+     parameter validation whereas other modules had little. This has now been
+     changed so that the same level of validation is present in all modules, and
+     that it is now optional with the MBEDTLS_CHECK_PARAMS flag which by default
+     is off. That means that checks which were previously present by default
+     will no longer be.
+
+New deprecations
+   * Deprecate mbedtls_ctr_drbg_update and mbedtls_hmac_drbg_update
+     in favor of functions that can return an error code.
+
+Bugfix
+   * Fix for Clang, which was reporting a warning for the bignum.c inline
+     assembly for AMD64 targets creating string literals greater than those
+     permitted by the ISO C99 standard. Found by Aaron Jones. Fixes #482.
+   * Fix runtime error in `mbedtls_platform_entropy_poll()` when run
+     through qemu user emulation. Reported and fix suggested by randombit
+     in #1212. Fixes #1212.
+   * Fix an unsafe bounds check when restoring an SSL session from a ticket.
+     This could lead to a buffer overflow, but only in case ticket authentication
+     was broken. Reported and fix suggested by Guido Vranken in #659.
+   * Add explicit integer to enumeration type casts to example program
+     programs/pkey/gen_key which previously led to compilation failure
+     on some toolchains. Reported by phoenixmcallister. Fixes #2170.
+   * Fix double initialization of ECC hardware that made some accelerators
+     hang.
+   * Clarify documentation of mbedtls_ssl_set_own_cert() regarding the absence
+     of check for certificate/key matching. Reported by Attila Molnar, #507.
+
+ = mbed TLS 2.15.1 branch released 2018-11-30
+
+ Changes
+    * Update the Mbed Crypto submodule to version 0.1.0b2.
+
+ = mbed TLS 2.15.0 branch released 2018-11-23
+
+ Features
+    * Add an experimental build option, USE_CRYPTO_SUBMODULE, to enable use of
+      Mbed Crypto as the source of the cryptography implementation.
+    * Add an experimental configuration option, MBEDTLS_PSA_CRYPTO_C, to enable
+      the PSA Crypto API from Mbed Crypto when additionally used with the
+      USE_CRYPTO_SUBMODULE build option.
+
+ Changes
+    * Add unit tests for AES-GCM when called through mbedtls_cipher_auth_xxx()
+      from the cipher abstraction layer. Fixes #2198.
+
+= mbed TLS 2.14.1 branch released 2018-11-30
+
+Security
+   * Fix timing variations and memory access variations in RSA PKCS#1 v1.5
+     decryption that could lead to a Bleichenbacher-style padding oracle
+     attack. In TLS, this affects servers that accept ciphersuites based on
+     RSA decryption (i.e. ciphersuites whose name contains RSA but not
+     (EC)DH(E)). Discovered by Eyal Ronen (Weizmann Institute),  Robert Gillham
+     (University of Adelaide), Daniel Genkin (University of Michigan),
+     Adi Shamir (Weizmann Institute), David Wong (NCC Group), and Yuval Yarom
+     (University of Adelaide, Data61). The attack is described in more detail
+     in the paper available here: http://cat.eyalro.net/cat.pdf  CVE-2018-19608
+   * In mbedtls_mpi_write_binary(), don't leak the exact size of the number
+     via branching and memory access patterns. An attacker who could submit
+     a plaintext for RSA PKCS#1 v1.5 decryption but only observe the timing
+     of the decryption and not its result could nonetheless decrypt RSA
+     plaintexts and forge RSA signatures. Other asymmetric algorithms may
+     have been similarly vulnerable. Reported by Eyal Ronen, Robert Gillham,
+     Daniel Genkin, Adi Shamir, David Wong and Yuval Yarom.
+   * Wipe sensitive buffers on the stack in the CTR_DRBG and HMAC_DRBG
+     modules.
+
+API Changes
+   * The new functions mbedtls_ctr_drbg_update_ret() and
+     mbedtls_hmac_drbg_update_ret() are similar to mbedtls_ctr_drbg_update()
+     and mbedtls_hmac_drbg_update() respectively, but the new functions
+     report errors whereas the old functions return void. We recommend that
+     applications use the new functions.
+
+= mbed TLS 2.14.0 branch released 2018-11-19
+
+Security
+   * Fix overly strict DN comparison when looking for CRLs belonging to a
+     particular CA. This previously led to ignoring CRLs when the CRL's issuer
+     name and the CA's subject name differed in their string encoding (e.g.,
+     one using PrintableString and the other UTF8String) or in the choice of
+     upper and lower case. Reported by Henrik Andersson of Bosch GmbH in issue
+     #1784.
+   * Fix a flawed bounds check in server PSK hint parsing. In case the
+     incoming message buffer was placed within the first 64KiB of address
+     space and a PSK-(EC)DHE ciphersuite was used, this allowed an attacker
+     to trigger a memory access up to 64KiB beyond the incoming message buffer,
+     potentially leading to an application crash or information disclosure.
+   * Fix mbedtls_mpi_is_prime() to use more rounds of probabilistic testing. The
+     previous settings for the number of rounds made it practical for an
+     adversary to construct non-primes that would be erroneously accepted as
+     primes with high probability. This does not have an impact on the
+     security of TLS, but can matter in other contexts with numbers chosen
+     potentially by an adversary that should be prime and can be validated.
+     For example, the number of rounds was enough to securely generate RSA key
+     pairs or Diffie-Hellman parameters, but was insufficient to validate
+     Diffie-Hellman parameters properly.
+     See "Prime and Prejudice" by by Martin R. Albrecht and Jake Massimo and
+     Kenneth G. Paterson and Juraj Somorovsky.
+
+Features
+   * Add support for temporarily suspending expensive ECC computations after
+     some configurable amount of operations. This is intended to be used in
+     constrained, single-threaded systems where ECC is time consuming and can
+     block other operations until they complete. This is disabled by default,
+     but can be enabled by MBEDTLS_ECP_RESTARTABLE at compile time and
+     configured by mbedtls_ecp_set_max_ops() at runtime. It applies to the new
+     xxx_restartable functions in ECP, ECDSA, PK and X.509 (CRL not supported
+     yet), and to existing functions in ECDH and SSL (currently only
+     implemented client-side, for ECDHE-ECDSA ciphersuites in TLS 1.2,
+     including client authentication).
+   * Add support for Arm CPU DSP extensions to accelerate asymmetric key
+     operations. On CPUs where the extensions are available, they can accelerate
+     MPI multiplications used in ECC and RSA cryptography. Contributed by
+     Aurelien Jarno.
+   * Extend RSASSA-PSS signature to allow a smaller salt size. Previously, PSS
+     signature always used a salt with the same length as the hash, and returned
+     an error if this was not possible. Now the salt size may be up to two bytes
+     shorter. This allows the library to support all hash and signature sizes
+     that comply with FIPS 186-4, including SHA-512 with a 1024-bit key.
+   * Add support for 128-bit keys in CTR_DRBG. Note that using keys shorter
+     than 256 bits limits the security of generated material to 128 bits.
+
+API Changes
+   * Add a common error code of `MBEDTLS_ERR_PLATFORM_FEATURE_UNSUPPORTED` for
+     a feature that is not supported by underlying alternative
+     implementations implementing cryptographic primitives. This is useful for
+     hardware accelerators that don't implement all options or features.
+
+New deprecations
+   * All module specific errors following the form
+     MBEDTLS_ERR_XXX_FEATURE_UNAVAILABLE that indicate a feature is not
+     supported are deprecated and are now replaced by the new equivalent
+     platform error.
+   * All module specific generic hardware acceleration errors following the
+     form MBEDTLS_ERR_XXX_HW_ACCEL_FAILED that are deprecated and are replaced
+     by the equivalent plaform error.
+   * Deprecate the function mbedtls_mpi_is_prime() in favor of
+     mbedtls_mpi_is_prime_ext() which allows specifying the number of
+     Miller-Rabin rounds.
+
+Bugfix
+   * Fix wrong order of freeing in programs/ssl/ssl_server2 example
+     application leading to a memory leak in case both
+     MBEDTLS_MEMORY_BUFFER_ALLOC_C and MBEDTLS_MEMORY_BACKTRACE are set.
+     Fixes #2069.
+   * Fix a bug in the update function for SSL ticket keys which previously
+     invalidated keys of a lifetime of less than a 1s. Fixes #1968.
+   * Fix failure in hmac_drbg in the benchmark sample application, when
+     MBEDTLS_THREADING_C is defined. Found by TrinityTonic, #1095
+   * Fix a bug in the record decryption routine ssl_decrypt_buf()
+     which lead to accepting properly authenticated but improperly
+     padded records in case of CBC ciphersuites using Encrypt-then-MAC.
+   * Fix memory leak and freeing without initialization in the example
+     program programs/x509/cert_write. Fixes #1422.
+   * Ignore IV in mbedtls_cipher_set_iv() when the cipher mode is
+     MBEDTLS_MODE_ECB. Found by ezdevelop. Fixes #1091.
+   * Zeroize memory used for buffering or reassembling handshake messages
+     after use.
+   * Use `mbedtls_platform_zeroize()` instead of `memset()` for zeroization
+     of sensitive data in the example programs aescrypt2 and crypt_and_hash.
+   * Change the default string format used for various X.509 DN attributes to
+     UTF8String. Previously, the use of the PrintableString format led to
+     wildcards and non-ASCII characters being unusable in some DN attributes.
+     Reported by raprepo in #1860 and by kevinpt in #468. Fix contributed by
+     Thomas-Dee.
+   * Fix compilation failure for configurations which use compile time
+     replacements of standard calloc/free functions through the macros
+     MBEDTLS_PLATFORM_CALLOC_MACRO and MBEDTLS_PLATFORM_FREE_MACRO.
+     Reported by ole-de and ddhome2006. Fixes #882, #1642 and #1706.
+
+Changes
+   * Removed support for Yotta as a build tool.
+   * Add tests for session resumption in DTLS.
+   * Close a test gap in (D)TLS between the client side and the server side:
+     test the handling of large packets and small packets on the client side
+     in the same way as on the server side.
+   * Change the dtls_client and dtls_server samples to work by default over
+     IPv6 and optionally by a build option over IPv4.
+   * Change the use of Windows threading to use Microsoft Visual C++ runtime
+     calls, rather than Win32 API calls directly. This is necessary to avoid
+     conflict with C runtime usage. Found and fixed by irwir.
+   * Remember the string format of X.509 DN attributes when replicating
+     X.509 DNs. Previously, DN attributes were always written in their default
+     string format (mostly PrintableString), which could lead to CRTs being
+     created which used PrintableStrings in the issuer field even though the
+     signing CA used UTF8Strings in its subject field; while X.509 compliant,
+     such CRTs were rejected in some applications, e.g. some versions of
+     Firefox, curl and GnuTLS. Reported in #1033 by Moschn. Fix contributed by
+     Thomas-Dee.
+   * Improve documentation of mbedtls_ssl_get_verify_result().
+     Fixes #517 reported by github-monoculture.
+   * Add MBEDTLS_MPI_GEN_PRIME_FLAG_LOW_ERR flag to mbedtls_mpi_gen_prime() and
+     use it to reduce error probability in RSA key generation to levels mandated
+     by FIPS-186-4.
+
+= mbed TLS 2.13.1 branch released 2018-09-06
+
+API Changes
+   * Extend the platform module with an abstraction mbedtls_platform_gmtime_r()
+     whose implementation should behave as a thread-safe version of gmtime().
+     This allows users to configure such an implementation at compile time when
+     the target system cannot be deduced automatically, by setting the option
+     MBEDTLS_PLATFORM_GMTIME_R_ALT. At this stage Mbed TLS is only able to
+     automatically select implementations for Windows and POSIX C libraries.
+
+Bugfix
+   * Fix build failures on platforms where only gmtime() is available but
+     neither gmtime_r() nor gmtime_s() are present. Fixes #1907.
+
+= mbed TLS 2.13.0 branch released 2018-08-31
+
+Security
+   * Fix an issue in the X.509 module which could lead to a buffer overread
+     during certificate extensions parsing. In case of receiving malformed
+     input (extensions length field equal to 0), an illegal read of one byte
+     beyond the input buffer is made. Found and analyzed by Nathan Crandall.
+
+Features
+   * Add support for fragmentation of outgoing DTLS handshake messages. This
+     is controlled by the maximum fragment length as set locally or negotiated
+     with the peer, as well as by a new per-connection MTU option, set using
+     mbedtls_ssl_set_mtu().
+   * Add support for auto-adjustment of MTU to a safe value during the
+     handshake when flights do not get through (RFC 6347, section 4.1.1.1,
+     last paragraph).
+   * Add support for packing multiple records within a single datagram,
+     enabled by default.
+   * Add support for buffering out-of-order handshake messages in DTLS.
+     The maximum amount of RAM used for this can be controlled by the
+     compile-time constant MBEDTLS_SSL_DTLS_MAX_BUFFERING defined
+     in mbedtls/config.h.
+
+API Changes
+   * Add function mbedtls_ssl_set_datagram_packing() to configure
+     the use of datagram packing (enabled by default).
+
+Bugfix
+   * Fix a potential memory leak in mbedtls_ssl_setup() function. An allocation
+     failure in the function could lead to other buffers being leaked.
+   * Fixes an issue with MBEDTLS_CHACHAPOLY_C which would not compile if
+     MBEDTLS_ARC4_C and MBEDTLS_CIPHER_NULL_CIPHER weren't also defined. #1890
+   * Fix a memory leak in ecp_mul_comb() if ecp_precompute_comb() fails.
+     Fix contributed by Espressif Systems.
+   * Add ecc extensions only if an ecc based ciphersuite is used.
+     This improves compliance to RFC 4492, and as a result, solves
+     interoperability issues with BouncyCastle. Raised by milenamil in #1157.
+   * Replace printf with mbedtls_printf in the ARIA module. Found by
+     TrinityTonic in #1908.
+   * Fix potential use-after-free in mbedtls_ssl_get_max_frag_len()
+     and mbedtls_ssl_get_record_expansion() after a session reset. Fixes #1941.
+   * Fix a bug that caused SSL/TLS clients to incorrectly abort the handshake
+     with TLS versions 1.1 and earlier when the server requested authentication
+     without providing a list of CAs. This was due to an overly strict bounds
+     check in parsing the CertificateRequest message,
+     introduced in Mbed TLS 2.12.0. Fixes #1954.
+   * Fix a miscalculation of the maximum record expansion in
+     mbedtls_ssl_get_record_expansion() in case of ChachaPoly ciphersuites,
+     or CBC ciphersuites in (D)TLS versions 1.1 or higher. Fixes #1913, #1914.
+   * Fix undefined shifts with negative values in certificates parsing
+     (found by Catena cyber using oss-fuzz)
+   * Fix memory leak and free without initialization in pk_encrypt
+     and pk_decrypt example programs. Reported by Brace Stout. Fixes #1128.
+   * Remove redundant else statement. Raised by irwir. Fixes #1776.
+
+Changes
+   * Copy headers preserving timestamps when doing a "make install".
+     Contributed by xueruini.
+   * Allow the forward declaration of public structs. Contributed by Dawid
+     Drozd. Fixes #1215 raised by randombit.
+   * Improve compatibility with some alternative CCM implementations by using
+     CCM test vectors from RAM.
+   * Add support for buffering of out-of-order handshake messages.
+   * Add warnings to the documentation of the HKDF module to reduce the risk
+     of misusing the mbedtls_hkdf_extract() and mbedtls_hkdf_expand()
+     functions. Fixes #1775. Reported by Brian J. Murray.
+
+= mbed TLS 2.12.0 branch released 2018-07-25
+
+Security
+   * Fix a vulnerability in TLS ciphersuites based on CBC and using SHA-384,
+     in (D)TLS 1.0 to 1.2, that allowed an active network attacker to
+     partially recover the plaintext of messages under some conditions by
+     exploiting timing measurements. With DTLS, the attacker could perform
+     this recovery by sending many messages in the same connection. With TLS
+     or if mbedtls_ssl_conf_dtls_badmac_limit() was used, the attack only
+     worked if the same secret (for example a HTTP Cookie) has been repeatedly
+     sent over connections manipulated by the attacker. Connections using GCM
+     or CCM instead of CBC, using hash sizes other than SHA-384, or using
+     Encrypt-then-Mac (RFC 7366) were not affected. The vulnerability was
+     caused by a miscalculation (for SHA-384) in a countermeasure to the
+     original Lucky 13 attack. Found by Kenny Paterson, Eyal Ronen and Adi
+     Shamir.
+   * Fix a vulnerability in TLS ciphersuites based on CBC, in (D)TLS 1.0 to
+     1.2, that allowed a local attacker, able to execute code on the local
+     machine as well as manipulate network packets, to partially recover the
+     plaintext of messages under some conditions by using a cache attack
+     targeting an internal MD/SHA buffer. With TLS or if
+     mbedtls_ssl_conf_dtls_badmac_limit() was used, the attack only worked if
+     the same secret (for example a HTTP Cookie) has been repeatedly sent over
+     connections manipulated by the attacker. Connections using GCM or CCM
+     instead of CBC or using Encrypt-then-Mac (RFC 7366) were not affected.
+     Found by Kenny Paterson, Eyal Ronen and Adi Shamir.
+   * Add a counter-measure against a vulnerability in TLS ciphersuites based
+     on CBC, in (D)TLS 1.0 to 1.2, that allowed a local attacker, able to
+     execute code on the local machine as well as manipulate network packets,
+     to partially recover the plaintext of messages under some conditions (see
+     previous entry) by using a cache attack targeting the SSL input record
+     buffer. Connections using GCM or CCM instead of CBC or using
+     Encrypt-then-Mac (RFC 7366) were not affected. Found by Kenny Paterson,
+     Eyal Ronen and Adi Shamir.
+
+Features
+   * Add new crypto primitives from RFC 7539: stream cipher Chacha20, one-time
+     authenticator Poly1305 and AEAD construct Chacha20-Poly1305. Contributed
+     by Daniel King.
+   * Add support for CHACHA20-POLY1305 ciphersuites from RFC 7905.
+   * Add platform support for the Haiku OS. (https://www.haiku-os.org).
+     Contributed by Augustin Cavalier.
+   * Make the receive and transmit buffers independent sizes, for situations
+     where the outgoing buffer can be fixed at a smaller size than the incoming
+     buffer, which can save some RAM. If buffer lengths are kept equal, there
+     is no functional difference. Contributed by Angus Gratton, and also
+     independently contributed again by Paul Sokolovsky.
+   * Add support for key wrapping modes based on AES as defined by
+     NIST SP 800-38F algorithms KW and KWP and by RFC 3394 and RFC 5649.
+
+Bugfix
+   * Fix the key_app_writer example which was writing a leading zero byte which
+     was creating an invalid ASN.1 tag. Found by Aryeh R. Fixes #1257.
+   * Fix compilation error on C++, because of a variable named new.
+     Found and fixed by Hirotaka Niisato in #1783.
+   * Fix "no symbols" warning issued by ranlib when building on Mac OS X. Fix
+     contributed by tabascoeye.
+   * Clarify documentation for mbedtls_ssl_write() to include 0 as a valid
+     return value. Found by @davidwu2000. #839
+   * Fix a memory leak in mbedtls_x509_csr_parse(), found by catenacyber,
+     Philippe Antoine. Fixes #1623.
+   * Remove unused headers included in x509.c. Found by Chris Hanson and fixed
+     by Brendan Shanks. Part of a fix for #992.
+   * Fix compilation error when MBEDTLS_ARC4_C is disabled and
+     MBEDTLS_CIPHER_NULL_CIPHER is enabled. Found by TrinityTonic in #1719.
+   * Added length checks to some TLS parsing functions. Found and fixed by
+     Philippe Antoine from Catena cyber. #1663.
+   * Fix the inline assembly for the MPI multiply helper function for i386 and
+     i386 with SSE2. Found by László Langó. Fixes #1550
+   * Fix namespacing in header files. Remove the `mbedtls` namespacing in
+     the `#include` in the header files. Resolves #857
+   * Fix compiler warning of 'use before initialisation' in
+     mbedtls_pk_parse_key(). Found by Martin Boye Petersen and fixed by Dawid
+     Drozd. #1098
+   * Fix decryption for zero length messages (which contain all padding) when a
+     CBC based ciphersuite is used together with Encrypt-then-MAC. Previously,
+     such a message was wrongly reported as an invalid record and therefore lead
+     to the connection being terminated. Seen most often with OpenSSL using
+     TLS 1.0. Reported by @kFYatek and by Conor Murphy on the forum. Fix
+     contributed by Espressif Systems. Fixes #1632
+   * Fix ssl_client2 example to send application data with 0-length content
+     when the request_size argument is set to 0 as stated in the documentation.
+     Fixes #1833.
+   * Correct the documentation for `mbedtls_ssl_get_session()`. This API has
+     deep copy of the session, and the peer certificate is not lost. Fixes #926.
+   * Fix build using -std=c99. Fixed by Nick Wilson.
+
+Changes
+   * Fail when receiving a TLS alert message with an invalid length, or invalid
+     zero-length messages when using TLS 1.2. Contributed by Espressif Systems.
+   * Change the default behaviour of mbedtls_hkdf_extract() to return an error
+     when calling with a NULL salt and non-zero salt_len. Contributed by
+     Brian J Murray
+   * Change the shebang line in Perl scripts to look up perl in the PATH.
+     Contributed by fbrosson.
+   * Allow overriding the time on Windows via the platform-time abstraction.
+     Fixed by Nick Wilson.
+   * Use gmtime_r/gmtime_s for thread-safety. Fixed by Nick Wilson.
+
+= mbed TLS 2.11.0 branch released 2018-06-18
+
+Features
+   * Add additional block mode, OFB (Output Feedback), to the AES module and
+     cipher abstraction module.
+   * Implement the HMAC-based extract-and-expand key derivation function
+     (HKDF) per RFC 5869. Contributed by Thomas Fossati.
+   * Add support for the CCM* block cipher mode as defined in IEEE Std. 802.15.4.
+   * Add support for the XTS block cipher mode with AES (AES-XTS).
+     Contributed by Aorimn in pull request #414.
+   * In TLS servers, support offloading private key operations to an external
+     cryptoprocessor. Private key operations can be asynchronous to allow
+     non-blocking operation of the TLS server stack.
+
+Bugfix
+   * Fix the cert_write example to handle certificates signed with elliptic
+     curves as well as RSA. Fixes #777 found by dbedev.
+   * Fix for redefinition of _WIN32_WINNT to avoid overriding a definition
+     used by user applications. Found and fixed by Fabio Alessandrelli.
+   * Fix compilation warnings with IAR toolchain, on 32 bit platform.
+     Reported by rahmanih in #683
+   * Fix braces in mbedtls_memory_buffer_alloc_status(). Found by sbranden, #552.
+
+Changes
+   * Changed CMake defaults for IAR to treat all compiler warnings as errors.
+   * Changed the Clang parameters used in the CMake build files to work for
+     versions later than 3.6. Versions of Clang earlier than this may no longer
+     work. Fixes #1072
+
+= mbed TLS 2.10.0 branch released 2018-06-06
+
+Features
+   * Add support for ARIA cipher (RFC 5794) and associated TLS ciphersuites
+     (RFC 6209). Disabled by default, see MBEDTLS_ARIA_C in config.h
+
+API Changes
+   * Extend the platform module with a util component that contains
+     functionality shared by multiple Mbed TLS modules. At this stage
+     platform_util.h (and its associated platform_util.c) only contain
+     mbedtls_platform_zeroize(), which is a critical function from a security
+     point of view. mbedtls_platform_zeroize() needs to be regularly tested
+     against compilers to ensure that calls to it are not removed from the
+     output binary as part of redundant code elimination optimizations.
+     Therefore, mbedtls_platform_zeroize() is moved to the platform module to
+     facilitate testing and maintenance.
+
+Bugfix
+   * Fix an issue with MicroBlaze support in bn_mul.h which was causing the
+     build to fail. Found by zv-io. Fixes #1651.
+
+Changes
+   * Support TLS testing in out-of-source builds using cmake. Fixes #1193.
+   * Fix redundant declaration of mbedtls_ssl_list_ciphersuites. Raised by
+     TrinityTonic. #1359.
+
+= mbed TLS 2.9.0 branch released 2018-04-30
+
+Security
+   * Fix an issue in the X.509 module which could lead to a buffer overread
+     during certificate validation. Additionally, the issue could also lead to
+     unnecessary callback checks being made or to some validation checks to be
+     omitted. The overread could be triggered remotely, while the other issues
+     would require a non DER-compliant certificate to be correctly signed by a
+     trusted CA, or a trusted CA with a non DER-compliant certificate. Found by
+     luocm. Fixes #825.
+   * Fix the buffer length assertion in the ssl_parse_certificate_request()
+     function which led to an arbitrary overread of the message buffer. The
+     overreads could be caused by receiving a malformed message at the point
+     where an optional signature algorithms list is expected when the signature
+     algorithms section is too short. In builds with debug output, the overread
+     data is output with the debug data.
+   * Fix a client-side bug in the validation of the server's ciphersuite choice
+     which could potentially lead to the client accepting a ciphersuite it didn't
+     offer or a ciphersuite that cannot be used with the TLS or DTLS version
+     chosen by the server. This could lead to corruption of internal data
+     structures for some configurations.
+
+Features
+   * Add an option, MBEDTLS_AES_FEWER_TABLES, to dynamically compute smaller AES
+     tables during runtime, thereby reducing the RAM/ROM footprint by ~6KiB.
+     Suggested and contributed by jkivilin in pull request #394.
+   * Add initial support for Curve448 (RFC 7748). Only mbedtls_ecp_mul() and
+     ECDH primitive functions (mbedtls_ecdh_gen_public(),
+     mbedtls_ecdh_compute_shared()) are supported for now. Contributed by
+     Nicholas Wilson in pull request #348.
+
+API Changes
+   * Extend the public API with the function of mbedtls_net_poll() to allow user
+     applications to wait for a network context to become ready before reading
+     or writing.
+   * Add function mbedtls_ssl_check_pending() to the public API to allow
+     a check for whether more more data is pending to be processed in the
+     internal message buffers.
+     This function is necessary to determine when it is safe to idle on the
+     underlying transport in case event-driven IO is used.
+
+Bugfix
+   * Fix a spurious uninitialized variable warning in cmac.c. Fix independently
+     contributed by Brian J Murray and David Brown.
+   * Add missing dependencies in test suites that led to build failures
+     in configurations that omit certain hashes or public-key algorithms.
+     Fixes #1040.
+   * Fix C89 incompatibility in benchmark.c. Contributed by Brendan Shanks.
+     #1353
+   * Add missing dependencies for MBEDTLS_HAVE_TIME_DATE and
+     MBEDTLS_VERSION_FEATURES in some test suites. Contributed by
+     Deomid Ryabkov. Fixes #1299, #1475.
+   * Fix the Makefile build process for building shared libraries on Mac OS X.
+     Fixed by mnacamura.
+   * Fix parsing of PKCS#8 encoded Elliptic Curve keys. Previously Mbed TLS was
+     unable to parse keys which had only the optional parameters field of the
+     ECPrivateKey structure. Found by Jethro Beekman, fixed in #1379.
+   * Return the plaintext data more quickly on unpadded CBC decryption, as
+     stated in the mbedtls_cipher_update() documentation. Contributed by
+     Andy Leiserson.
+   * Fix overriding and ignoring return values when parsing and writing to
+     a file in pk_sign program. Found by kevlut in #1142.
+   * Restrict usage of error code MBEDTLS_ERR_SSL_WANT_READ to situations
+     where data needs to be fetched from the underlying transport in order
+     to make progress. Previously, this error code was also occasionally
+     returned when unexpected messages were being discarded, ignoring that
+     further messages could potentially already be pending to be processed
+     in the internal buffers; these cases led to deadlocks when event-driven
+     I/O was used. Found and reported by Hubert Mis in #772.
+   * Fix buffer length assertions in the ssl_parse_certificate_request()
+     function which leads to a potential one byte overread of the message
+     buffer.
+   * Fix invalid buffer sizes passed to zlib during record compression and
+     decompression.
+   * Fix the soversion of libmbedcrypto to match the soversion of the
+     maintained 2.7 branch. The soversion was increased in Mbed TLS
+     version 2.7.1 to reflect breaking changes in that release, but the
+     increment was missed in 2.8.0 and later releases outside of the 2.7 branch.
+
+Changes
+   * Remove some redundant code in bignum.c. Contributed by Alexey Skalozub.
+   * Support cmake builds where Mbed TLS is a subproject. Fix contributed
+     independently by Matthieu Volat and Arne Schwabe.
+   * Improve testing in configurations that omit certain hashes or
+     public-key algorithms. Includes contributions by Gert van Dijk.
+   * Improve negative testing of X.509 parsing.
+   * Do not define global mutexes around readdir() and gmtime() in
+     configurations where the feature is disabled. Found and fixed by Gergely
+     Budai.
+   * Harden the function mbedtls_ssl_config_free() against misuse, so that it
+     doesn't leak memory if the user doesn't use mbedtls_ssl_conf_psk() and
+     instead incorrectly manipulates the configuration structure directly.
+     Found and fix submitted by junyeonLEE in #1220.
+   * Provide an empty implementation of mbedtls_pkcs5_pbes2() when
+     MBEDTLS_ASN1_PARSE_C is not enabled. This allows the use of PBKDF2
+     without PBES2. Fixed by Marcos Del Sol Vives.
+   * Add the order of the base point as N in the mbedtls_ecp_group structure
+     for Curve25519 (other curves had it already). Contributed by Nicholas
+     Wilson #481
+   * Improve the documentation of mbedtls_net_accept(). Contributed by Ivan
+     Krylov.
+   * Improve the documentation of mbedtls_ssl_write(). Suggested by
+     Paul Sokolovsky in #1356.
+   * Add an option in the Makefile to support ar utilities where the operation
+     letter must not be prefixed by '-', such as LLVM. Found and fixed by
+     Alex Hixon.
+   * Allow configuring the shared library extension by setting the DLEXT
+     environment variable when using the project makefiles.
+   * Optimize unnecessary zeroing in mbedtls_mpi_copy. Based on a contribution
+     by Alexey Skalozub in #405.
+   * In the SSL module, when f_send, f_recv or f_recv_timeout report
+     transmitting more than the required length, return an error. Raised by
+     Sam O'Connor in #1245.
+   * Improve robustness of mbedtls_ssl_derive_keys against the use of
+     HMAC functions with non-HMAC ciphersuites. Independently contributed
+     by Jiayuan Chen in #1377. Fixes #1437.
+   * Improve security of RSA key generation by including criteria from
+     FIPS 186-4. Contributed by Jethro Beekman. #1380
+   * Declare functions in header files even when an alternative implementation
+     of the corresponding module is activated by defining the corresponding
+     MBEDTLS_XXX_ALT macro. This means that alternative implementations do
+     not need to copy the declarations, and ensures that they will have the
+     same API.
+   * Add platform setup and teardown calls in test suites.
+
+= mbed TLS 2.8.0 branch released 2018-03-16
+
+Default behavior changes
+   * The truncated HMAC extension now conforms to RFC 6066. This means
+     that when both sides of a TLS connection negotiate the truncated
+     HMAC extension, Mbed TLS can now interoperate with other
+     compliant implementations, but this breaks interoperability with
+     prior versions of Mbed TLS. To restore the old behavior, enable
+     the (deprecated) option MBEDTLS_SSL_TRUNCATED_HMAC_COMPAT in
+     config.h. Found by Andreas Walz (ivESK, Offenburg University of
+     Applied Sciences).
+
+Security
+   * Fix implementation of the truncated HMAC extension. The previous
+     implementation allowed an offline 2^80 brute force attack on the
+     HMAC key of a single, uninterrupted connection (with no
+     resumption of the session).
+   * Verify results of RSA private key operations to defend
+     against Bellcore glitch attack.
+   * Fix a buffer overread in ssl_parse_server_key_exchange() that could cause
+     a crash on invalid input.
+   * Fix a buffer overread in ssl_parse_server_psk_hint() that could cause a
+     crash on invalid input.
+   * Fix CRL parsing to reject CRLs containing unsupported critical
+     extensions. Found by Falko Strenzke and Evangelos Karatsiolis.
+
+Features
+   * Extend PKCS#8 interface by introducing support for the entire SHA
+     algorithms family when encrypting private keys using PKCS#5 v2.0.
+     This allows reading encrypted PEM files produced by software that
+     uses PBKDF2-SHA2, such as OpenSSL 1.1. Submitted by Antonio Quartulli,
+     OpenVPN Inc. Fixes #1339
+   * Add support for public keys encoded in PKCS#1 format. #1122
+
+New deprecations
+   * Deprecate support for record compression (configuration option
+     MBEDTLS_ZLIB_SUPPORT).
+
+Bugfix
+   * Fix the name of a DHE parameter that was accidentally changed in 2.7.0.
+     Fixes #1358.
+   * Fix test_suite_pk to work on 64-bit ILP32 systems. #849
+   * Fix mbedtls_x509_crt_profile_suiteb, which used to reject all certificates
+     with flag MBEDTLS_X509_BADCERT_BAD_PK even when the key type was correct.
+     In the context of SSL, this resulted in handshake failure. Reported by
+     daniel in the Mbed TLS forum. #1351
+   * Fix Windows x64 builds with the included mbedTLS.sln file. #1347
+   * Fix setting version TLSv1 as minimal version, even if TLS 1
+     is not enabled. Set MBEDTLS_SSL_MIN_MAJOR_VERSION
+     and MBEDTLS_SSL_MIN_MINOR_VERSION instead of
+     MBEDTLS_SSL_MAJOR_VERSION_3 and MBEDTLS_SSL_MINOR_VERSION_1. #664
+   * Fix compilation error on Mingw32 when _TRUNCATE is defined. Use _TRUNCATE
+     only if __MINGW32__ not defined. Fix suggested by Thomas Glanzmann and
+     Nick Wilson on issue #355
+   * In test_suite_pk, pass valid parameters when testing for hash length
+     overflow. #1179
+   * Fix memory allocation corner cases in memory_buffer_alloc.c module. Found
+     by Guido Vranken. #639
+   * Log correct number of ciphersuites used in Client Hello message. #918
+   * Fix X509 CRT parsing that would potentially accept an invalid tag when
+     parsing the subject alternative names.
+   * Fix a possible arithmetic overflow in ssl_parse_server_key_exchange()
+     that could cause a key exchange to fail on valid data.
+   * Fix a possible arithmetic overflow in ssl_parse_server_psk_hint() that
+     could cause a key exchange to fail on valid data.
+   * Don't define mbedtls_aes_decrypt and mbedtls_aes_encrypt under
+     MBEDTLS_DEPRECATED_REMOVED. #1388
+   * Fix a 1-byte heap buffer overflow (read-only) during private key parsing.
+     Found through fuzz testing.
+
+Changes
+   * Fix tag lengths and value ranges in the documentation of CCM encryption.
+     Contributed by Mathieu Briand.
+   * Fix typo in a comment ctr_drbg.c. Contributed by Paul Sokolovsky.
+   * Remove support for the library reference configuration for picocoin.
+   * MD functions deprecated in 2.7.0 are no longer inline, to provide
+     a migration path for those depending on the library's ABI.
+   * Clarify the documentation of mbedtls_ssl_setup.
+   * Use (void) when defining functions with no parameters. Contributed by
+     Joris Aerts. #678
+
+= mbed TLS 2.7.0 branch released 2018-02-03
+
+Security
+   * Fix a heap corruption issue in the implementation of the truncated HMAC
+     extension. When the truncated HMAC extension is enabled and CBC is used,
+     sending a malicious application packet could be used to selectively corrupt
+     6 bytes on the peer's heap, which could potentially lead to crash or remote
+     code execution. The issue could be triggered remotely from either side in
+     both TLS and DTLS. CVE-2018-0488
+   * Fix a buffer overflow in RSA-PSS verification when the hash was too large
+     for the key size, which could potentially lead to crash or remote code
+     execution. Found by Seth Terashima, Qualcomm Product Security Initiative,
+     Qualcomm Technologies Inc. CVE-2018-0487
+   * Fix buffer overflow in RSA-PSS verification when the unmasked data is all
+     zeros.
+   * Fix an unsafe bounds check in ssl_parse_client_psk_identity() when adding
+     64 KiB to the address of the SSL buffer and causing a wrap around.
+   * Fix a potential heap buffer overflow in mbedtls_ssl_write(). When the (by
+     default enabled) maximum fragment length extension is disabled in the
+     config and the application data buffer passed to mbedtls_ssl_write
+     is larger than the internal message buffer (16384 bytes by default), the
+     latter overflows. The exploitability of this issue depends on whether the
+     application layer can be forced into sending such large packets. The issue
+     was independently reported by Tim Nordell via e-mail and by Florin Petriuc
+     and sjorsdewit on GitHub. Fix proposed by Florin Petriuc in #1022.
+     Fixes #707.
+   * Add a provision to prevent compiler optimizations breaking the time
+     constancy of mbedtls_ssl_safer_memcmp().
+   * Ensure that buffers are cleared after use if they contain sensitive data.
+     Changes were introduced in multiple places in the library.
+   * Set PEM buffer to zero before freeing it, to avoid decoded private keys
+     being leaked to memory after release.
+   * Fix dhm_check_range() failing to detect trivial subgroups and potentially
+     leaking 1 bit of the private key. Reported by prashantkspatil.
+   * Make mbedtls_mpi_read_binary() constant-time with respect to the input
+     data. Previously, trailing zero bytes were detected and omitted for the
+     sake of saving memory, but potentially leading to slight timing
+     differences. Reported by Marco Macchetti, Kudelski Group.
+   * Wipe stack buffer temporarily holding EC private exponent
+     after keypair generation.
+   * Fix a potential heap buffer over-read in ALPN extension parsing
+     (server-side). Could result in application crash, but only if an ALPN
+     name larger than 16 bytes had been configured on the server.
+   * Change default choice of DHE parameters from untrustworthy RFC 5114
+     to RFC 3526 containing parameters generated in a nothing-up-my-sleeve
+     manner.
+
+Features
+   * Allow comments in test data files.
+   * The selftest program can execute a subset of the tests based on command
+     line arguments.
+   * New unit tests for timing. Improve the self-test to be more robust
+     when run on a heavily-loaded machine.
+   * Add alternative implementation support for CCM and CMAC (MBEDTLS_CCM_ALT,
+     MBEDTLS_CMAC_ALT). Submitted by Steven Cooreman, Silicon Labs.
+   * Add support for alternative implementations of GCM, selected by the
+     configuration flag MBEDTLS_GCM_ALT.
+   * Add support for alternative implementations for ECDSA, controlled by new
+     configuration flags MBEDTLS_ECDSA_SIGN_ALT, MBEDTLS_ECDSA_VERIFY_ALT and
+     MBEDTLS_ECDSDA_GENKEY_AT in config.h.
+     The following functions from the ECDSA module can be replaced
+     with alternative implementation:
+     mbedtls_ecdsa_sign(), mbedtls_ecdsa_verify() and mbedtls_ecdsa_genkey().
+   * Add support for alternative implementation of ECDH, controlled by the
+     new configuration flags MBEDTLS_ECDH_COMPUTE_SHARED_ALT and
+     MBEDTLS_ECDH_GEN_PUBLIC_ALT in config.h.
+     The following functions from the ECDH module can be replaced
+     with an alternative implementation:
+     mbedtls_ecdh_gen_public() and mbedtls_ecdh_compute_shared().
+   * Add support for alternative implementation of ECJPAKE, controlled by
+     the new configuration flag MBEDTLS_ECJPAKE_ALT.
+   * Add mechanism to provide alternative implementation of the DHM module.
+
+API Changes
+   * Extend RSA interface by multiple functions allowing structure-
+     independent setup and export of RSA contexts. Most notably,
+     mbedtls_rsa_import() and mbedtls_rsa_complete() are introduced for setting
+     up RSA contexts from partial key material and having them completed to the
+     needs of the implementation automatically. This allows to setup private RSA
+     contexts from keys consisting of N,D,E only, even if P,Q are needed for the
+     purpose or CRT and/or blinding.
+   * The configuration option MBEDTLS_RSA_ALT can be used to define alternative
+     implementations of the RSA interface declared in rsa.h.
+   * The following functions in the message digest modules (MD2, MD4, MD5,
+     SHA1, SHA256, SHA512) have been deprecated and replaced as shown below.
+     The new functions change the return type from void to int to allow
+     returning error codes when using MBEDTLS_<MODULE>_ALT.
+     mbedtls_<MODULE>_starts() -> mbedtls_<MODULE>_starts_ret()
+     mbedtls_<MODULE>_update() -> mbedtls_<MODULE>_update_ret()
+     mbedtls_<MODULE>_finish() -> mbedtls_<MODULE>_finish_ret()
+     mbedtls_<MODULE>_process() -> mbedtls_internal_<MODULE>_process()
+
+New deprecations
+   * Deprecate usage of RSA primitives with non-matching key-type
+     (e.g. signing with a public key).
+   * Direct manipulation of structure fields of RSA contexts is deprecated.
+     Users are advised to use the extended RSA API instead.
+   * Deprecate usage of message digest functions that return void
+     (mbedtls_<MODULE>_starts, mbedtls_<MODULE>_update,
+     mbedtls_<MODULE>_finish and mbedtls_<MODULE>_process where <MODULE> is
+     any of MD2, MD4, MD5, SHA1, SHA256, SHA512) in favor of functions
+     that can return an error code.
+   * Deprecate untrustworthy DHE parameters from RFC 5114. Superseded by
+     parameters from RFC 3526 or the newly added parameters from RFC 7919.
+   * Deprecate hex string DHE constants MBEDTLS_DHM_RFC3526_MODP_2048_P etc.
+     Supserseded by binary encoded constants MBEDTLS_DHM_RFC3526_MODP_2048_P_BIN
+     etc.
+   * Deprecate mbedtls_ssl_conf_dh_param() for setting default DHE parameters
+     from hex strings. Superseded by mbedtls_ssl_conf_dh_param_bin()
+     accepting DHM parameters in binary form, matching the new constants.
+
+Bugfix
+   * Fix ssl_parse_record_header() to silently discard invalid DTLS records
+     as recommended in RFC 6347 Section 4.1.2.7.
+   * Fix memory leak in mbedtls_ssl_set_hostname() when called multiple times.
+     Found by projectgus and Jethro Beekman, #836.
+   * Fix usage help in ssl_server2 example. Found and fixed by Bei Lin.
+   * Parse signature algorithm extension when renegotiating. Previously,
+     renegotiated handshakes would only accept signatures using SHA-1
+     regardless of the peer's preferences, or fail if SHA-1 was disabled.
+   * Fix leap year calculation in x509_date_is_valid() to ensure that invalid
+     dates on leap years with 100 and 400 intervals are handled correctly. Found
+     by Nicholas Wilson. #694
+   * Fix some invalid RSA-PSS signatures with keys of size 8N+1 that were
+     accepted. Generating these signatures required the private key.
+   * Fix out-of-memory problem when parsing 4096-bit PKCS8-encrypted RSA keys.
+     Found independently by Florian in the mbed TLS forum and by Mishamax.
+     #878, #1019.
+   * Fix variable used before assignment compilation warnings with IAR
+     toolchain. Found by gkerrien38.
+   * Fix unchecked return codes from AES, DES and 3DES functions in
+     pem_aes_decrypt(), pem_des_decrypt() and pem_des3_decrypt() respectively.
+     If a call to one of the functions of the cryptographic primitive modules
+     failed, the error may not be noticed by the function
+     mbedtls_pem_read_buffer() causing it to return invalid values. Found by
+     Guido Vranken. #756
+   * Include configuration file in md.h, to fix compilation warnings.
+     Reported by aaronmdjones in #1001
+   * Correct extraction of signature-type from PK instance in X.509 CRT and CSR
+     writing routines that prevented these functions to work with alternative
+     RSA implementations. Raised by J.B. in the Mbed TLS forum. Fixes #1011.
+   * Don't print X.509 version tag for v1 CRT's, and omit extensions for
+     non-v3 CRT's.
+   * Fix bugs in RSA test suite under MBEDTLS_NO_PLATFORM_ENTROPY. #1023 #1024
+   * Fix net_would_block() to avoid modification by errno through fcntl() call.
+     Found by nkolban. Fixes #845.
+   * Fix handling of handshake messages in mbedtls_ssl_read() in case
+     MBEDTLS_SSL_RENEGOTIATION is disabled. Found by erja-gp.
+   * Add a check for invalid private parameters in mbedtls_ecdsa_sign().
+     Reported by Yolan Romailler.
+   * Fix word size check in in pk.c to not depend on MBEDTLS_HAVE_INT64.
+   * Fix incorrect unit in benchmark output. #850
+   * Add size-checks for record and handshake message content, securing
+     fragile yet non-exploitable code-paths.
+   * Fix crash when calling mbedtls_ssl_cache_free() twice. Found by
+     MilenkoMitrovic, #1104
+   * Fix mbedtls_timing_alarm(0) on Unix and MinGW.
+   * Fix use of uninitialized memory in mbedtls_timing_get_timer() when reset=1.
+   * Fix possible memory leaks in mbedtls_gcm_self_test().
+   * Added missing return code checks in mbedtls_aes_self_test().
+   * Fix issues in RSA key generation program programs/x509/rsa_genkey and the
+     RSA test suite where the failure of CTR DRBG initialization lead to
+     freeing an RSA context and several MPI's without proper initialization
+     beforehand.
+   * Fix error message in programs/pkey/gen_key.c. Found and fixed by Chris Xue.
+   * Fix programs/pkey/dh_server.c so that it actually works with dh_client.c.
+     Found and fixed by Martijn de Milliano.
+   * Fix an issue in the cipher decryption with the mode
+     MBEDTLS_PADDING_ONE_AND_ZEROS that sometimes accepted invalid padding.
+     Note, this padding mode is not used by the TLS protocol. Found and fixed by
+     Micha Kraus.
+   * Fix the entropy.c module to not call mbedtls_sha256_starts() or
+     mbedtls_sha512_starts() in the mbedtls_entropy_init() function.
+   * Fix the entropy.c module to ensure that mbedtls_sha256_init() or
+     mbedtls_sha512_init() is called before operating on the relevant context
+     structure. Do not assume that zeroizing a context is a correct way to
+     reset it. Found independently by ccli8 on Github.
+   * In mbedtls_entropy_free(), properly free the message digest context.
+   * Fix status handshake status message in programs/ssl/dtls_client.c. Found
+     and fixed by muddog.
+
+Changes
+   * Extend cert_write example program by options to set the certificate version
+     and the message digest. Further, allow enabling/disabling of authority
+     identifier, subject identifier and basic constraints extensions.
+   * Only check for necessary RSA structure fields in `mbedtls_rsa_private`. In
+     particular, don't require P,Q if neither CRT nor blinding are
+     used. Reported and fix proposed independently by satur9nine and sliai
+     on GitHub.
+   * Only run AES-192 self-test if AES-192 is available. Fixes #963.
+   * Tighten the RSA PKCS#1 v1.5 signature verification code and remove the
+     undeclared dependency of the RSA module on the ASN.1 module.
+   * Update all internal usage of deprecated message digest functions to the
+     new ones with return codes. In particular, this modifies the
+     mbedtls_md_info_t structure. Propagate errors from these functions
+     everywhere except some locations in the ssl_tls.c module.
+   * Improve CTR_DRBG error handling by propagating underlying AES errors.
+   * Add MBEDTLS_ERR_XXX_HW_ACCEL_FAILED error codes for all cryptography
+     modules where the software implementation can be replaced by a hardware
+     implementation.
+   * Add explicit warnings for the use of MD2, MD4, MD5, SHA-1, DES and ARC4
+     throughout the library.
+
+= mbed TLS 2.6.0 branch released 2017-08-10
+
+Security
+   * Fix authentication bypass in SSL/TLS: when authmode is set to optional,
+     mbedtls_ssl_get_verify_result() would incorrectly return 0 when the peer's
+     X.509 certificate chain had more than MBEDTLS_X509_MAX_INTERMEDIATE_CA
+     (default: 8) intermediates, even when it was not trusted. This could be
+     triggered remotely from either side. (With authmode set to 'required'
+     (the default), the handshake was correctly aborted).
+   * Reliably wipe sensitive data after use in the AES example applications
+     programs/aes/aescrypt2 and programs/aes/crypt_and_hash.
+     Found by Laurent Simon.
+
+Features
+   * Add the functions mbedtls_platform_setup() and mbedtls_platform_teardown()
+     and the context struct mbedtls_platform_context to perform
+     platform-specific setup and teardown operations. The macro
+     MBEDTLS_PLATFORM_SETUP_TEARDOWN_ALT allows the functions to be overridden
+     by the user in a platform_alt.h file. These new functions are required in
+     some embedded environments to provide a means of initialising underlying
+     cryptographic acceleration hardware.
+
+API Changes
+   * Reverted API/ABI breaking changes introduced in mbed TLS 2.5.1, to make the
+     API consistent with mbed TLS 2.5.0. Specifically removed the inline
+     qualifier from the functions mbedtls_aes_decrypt, mbedtls_aes_encrypt,
+     mbedtls_ssl_ciphersuite_uses_ec and mbedtls_ssl_ciphersuite_uses_psk. Found
+     by James Cowgill. #978
+   * Certificate verification functions now set flags to -1 in case the full
+     chain was not verified due to an internal error (including in the verify
+     callback) or chain length limitations.
+   * With authmode set to optional, the TLS handshake is now aborted if the
+     verification of the peer's certificate failed due to an overlong chain or
+     a fatal error in the verify callback.
+
+Bugfix
+   * Add a check if iv_len is zero in GCM, and return an error if it is zero.
+     Reported by roberto. #716
+   * Replace preprocessor condition from #if defined(MBEDTLS_THREADING_PTHREAD)
+     to #if defined(MBEDTLS_THREADING_C) as the library cannot assume they will
+     always be implemented by pthread support. #696
+   * Fix a resource leak on Windows platforms in mbedtls_x509_crt_parse_path(),
+     in the case of an error. Found by redplait. #590
+   * Add MBEDTLS_MPI_CHK to check for error value of mbedtls_mpi_fill_random.
+     Reported and fix suggested by guidovranken. #740
+   * Fix conditional preprocessor directives in bignum.h to enable 64-bit
+     compilation when using ARM Compiler 6.
+   * Fix a potential integer overflow in the version verification for DER
+     encoded X.509 CRLs. The overflow could enable maliciously constructed CRLs
+     to bypass the version verification check. Found by Peng Li/Yueh-Hsun Lin,
+     KNOX Security, Samsung Research America
+   * Fix potential integer overflow in the version verification for DER
+     encoded X.509 CSRs. The overflow could enable maliciously constructed CSRs
+     to bypass the version verification check. Found by Peng Li/Yueh-Hsun Lin,
+     KNOX Security, Samsung Research America
+   * Fix a potential integer overflow in the version verification for DER
+     encoded X.509 certificates. The overflow could enable maliciously
+     constructed certificates to bypass the certificate verification check.
+   * Fix a call to the libc function time() to call the platform abstraction
+     function mbedtls_time() instead. Found by wairua. #666
+   * Avoid shadowing of time and index functions through mbed TLS function
+     arguments. Found by inestlerode. #557.
+
+Changes
+   * Added config.h option MBEDTLS_NO_UDBL_DIVISION, to prevent the use of
+     64-bit division. This is useful on embedded platforms where 64-bit division
+     created a dependency on external libraries. #708
+   * Removed mutexes from ECP hardware accelerator code. Now all hardware
+     accelerator code in the library leaves concurrency handling to the
+     platform. Reported by Steven Cooreman. #863
+   * Define the macro MBEDTLS_AES_ROM_TABLES in the configuration file
+     config-no-entropy.h to reduce the RAM footprint.
+   * Added a test script that can be hooked into git that verifies commits
+     before they are pushed.
+   * Improve documentation of PKCS1 decryption functions.
+
+= mbed TLS 2.5.1 released 2017-06-21
+
+Security
+   * Fixed unlimited overread of heap-based buffer in mbedtls_ssl_read().
+     The issue could only happen client-side with renegotiation enabled.
+     Could result in DoS (application crash) or information leak
+     (if the application layer sent data read from mbedtls_ssl_read()
+     back to the server or to a third party). Can be triggered remotely.
+   * Removed SHA-1 and RIPEMD-160 from the default hash algorithms for
+     certificate verification. SHA-1 can be turned back on with a compile-time
+     option if needed.
+   * Fixed offset in FALLBACK_SCSV parsing that caused TLS server to fail to
+     detect it sometimes. Reported by Hugo Leisink. #810
+   * Tighten parsing of RSA PKCS#1 v1.5 signatures, to avoid a
+     potential Bleichenbacher/BERserk-style attack.
+
+Bugfix
+   * Remove size zero arrays from ECJPAKE test suite. Size zero arrays are not
+     valid C and they prevented the test from compiling in Visual Studio 2015
+     and with GCC using the -Wpedantic compilation option.
+   * Fix insufficient support for signature-hash-algorithm extension,
+     resulting in compatibility problems with Chrome. Found by hfloyrd. #823
+   * Fix behaviour that hid the original cause of fatal alerts in some cases
+     when sending the alert failed. The fix makes sure not to hide the error
+     that triggered the alert.
+   * Fix SSLv3 renegotiation behaviour and stop processing data received from
+     peer after sending a fatal alert to refuse a renegotiation attempt.
+     Previous behaviour was to keep processing data even after the alert has
+     been sent.
+   * Accept empty trusted CA chain in authentication mode
+     MBEDTLS_SSL_VERIFY_OPTIONAL. Found by Jethro Beekman. #864
+   * Fix implementation of mbedtls_ssl_parse_certificate() to not annihilate
+     fatal errors in authentication mode MBEDTLS_SSL_VERIFY_OPTIONAL and to
+     reflect bad EC curves within verification result.
+   * Fix bug that caused the modular inversion function to accept the invalid
+     modulus 1 and therefore to hang. Found by blaufish. #641.
+   * Fix incorrect sign computation in modular exponentiation when the base is
+     a negative MPI. Previously the result was always negative. Found by Guido
+     Vranken.
+   * Fix a numerical underflow leading to stack overflow in mpi_read_file()
+     that was triggered uppon reading an empty line. Found by Guido Vranken.
+
+Changes
+   * Send fatal alerts in more cases. The previous behaviour was to skip
+     sending the fatal alert and just drop the connection.
+   * Clarify ECDSA documentation and improve the sample code to avoid
+     misunderstanding and potentially dangerous use of the API. Pointed out
+     by Jean-Philippe Aumasson.
+
+= mbed TLS 2.5.0 branch released 2017-05-17
+
+Security
+   * Wipe stack buffers in RSA private key operations
+     (rsa_rsaes_pkcs1_v15_decrypt(), rsa_rsaes_oaep_decrypt). Found by Laurent
+     Simon.
+   * Add exponent blinding to RSA private operations as a countermeasure
+     against side-channel attacks like the cache attack described in
+     https://arxiv.org/abs/1702.08719v2.
+     Found and fix proposed by Michael Schwarz, Samuel Weiser, Daniel Gruss,
+     Clémentine Maurice and Stefan Mangard.
+
+Features
+   * Add hardware acceleration support for the Elliptic Curve Point module.
+     This involved exposing parts of the internal interface to enable
+     replacing the core functions and adding and alternative, module level
+     replacement support for enabling the extension of the interface.
+   * Add a new configuration option to 'mbedtls_ssl_config' to enable
+     suppressing the CA list in Certificate Request messages. The default
+     behaviour has not changed, namely every configured CAs name is included.
+
+API Changes
+   * The following functions in the AES module have been deprecated and replaced
+     by the functions shown below. The new functions change the return type from
+     void to int to allow returning error codes when using MBEDTLS_AES_ALT,
+     MBEDTLS_AES_DECRYPT_ALT or MBEDTLS_AES_ENCRYPT_ALT.
+     mbedtls_aes_decrypt() -> mbedtls_internal_aes_decrypt()
+     mbedtls_aes_encrypt() -> mbedtls_internal_aes_encrypt()
+
+Bugfix
+   * Remove macros from compat-1.3.h that correspond to deleted items from most
+     recent versions of the library. Found by Kyle Keen.
+   * Fixed issue in the Threading module that prevented mutexes from
+     initialising. Found by sznaider. #667 #843
+   * Add checks in the PK module for the RSA functions on 64-bit systems.
+     The PK and RSA modules use different types for passing hash length and
+     without these checks the type cast could lead to data loss. Found by Guido
+     Vranken.
+
+= mbed TLS 2.4.2 branch released 2017-03-08
+
+Security
+   * Add checks to prevent signature forgeries for very large messages while
+     using RSA through the PK module in 64-bit systems. The issue was caused by
+     some data loss when casting a size_t to an unsigned int value in the
+     functions rsa_verify_wrap(), rsa_sign_wrap(), rsa_alt_sign_wrap() and
+     mbedtls_pk_sign(). Found by Jean-Philippe Aumasson.
+   * Fixed potential livelock during the parsing of a CRL in PEM format in
+     mbedtls_x509_crl_parse(). A string containing a CRL followed by trailing
+     characters after the footer could result in the execution of an infinite
+     loop. The issue can be triggered remotely. Found by Greg Zaverucha,
+     Microsoft.
+   * Removed MD5 from the allowed hash algorithms for CertificateRequest and
+     CertificateVerify messages, to prevent SLOTH attacks against TLS 1.2.
+     Introduced by interoperability fix for #513.
+   * Fixed a bug that caused freeing a buffer that was allocated on the stack,
+     when verifying the validity of a key on secp224k1. This could be
+     triggered remotely for example with a maliciously constructed certificate
+     and potentially could lead to remote code execution on some platforms.
+     Reported independently by rongsaws and Aleksandar Nikolic, Cisco Talos
+     team. #569 CVE-2017-2784
+
+Bugfix
+   * Fix output certificate verification flags set by x509_crt_verify_top() when
+     traversing a chain of trusted CA. The issue would cause both flags,
+     MBEDTLS_X509_BADCERT_NOT_TRUSTED and MBEDTLS_X509_BADCERT_EXPIRED, to be
+     set when the verification conditions are not met regardless of the cause.
+     Found by Harm Verhagen and inestlerode. #665 #561
+   * Fix the redefinition of macro ssl_set_bio to an undefined symbol
+     mbedtls_ssl_set_bio_timeout in compat-1.3.h, by removing it.
+     Found by omlib-lin. #673
+   * Fix unused variable/function compilation warnings in pem.c, x509_crt.c and
+     x509_csr.c that are reported when building mbed TLS with a config.h that
+     does not define MBEDTLS_PEM_PARSE_C. Found by omnium21. #562
+   * Fix incorrect renegotiation condition in ssl_check_ctr_renegotiate() that
+     would compare 64 bits of the record counter instead of 48 bits as indicated
+     in RFC 6347 Section 4.3.1. This could cause the execution of the
+     renegotiation routines at unexpected times when the protocol is DTLS. Found
+     by wariua. #687
+   * Fixed multiple buffer overreads in mbedtls_pem_read_buffer() when parsing
+     the input string in PEM format to extract the different components. Found
+     by Eyal Itkin.
+   * Fixed potential arithmetic overflow in mbedtls_ctr_drbg_reseed() that could
+     cause buffer bound checks to be bypassed. Found by Eyal Itkin.
+   * Fixed potential arithmetic overflows in mbedtls_cipher_update() that could
+     cause buffer bound checks to be bypassed. Found by Eyal Itkin.
+   * Fixed potential arithmetic overflow in mbedtls_md2_update() that could
+     cause buffer bound checks to be bypassed. Found by Eyal Itkin.
+   * Fixed potential arithmetic overflow in mbedtls_base64_decode() that could
+     cause buffer bound checks to be bypassed. Found by Eyal Itkin.
+   * Fixed heap overreads in mbedtls_x509_get_time(). Found by Peng
+     Li/Yueh-Hsun Lin, KNOX Security, Samsung Research America.
+   * Fix potential memory leak in mbedtls_x509_crl_parse(). The leak was caused
+     by missing calls to mbedtls_pem_free() in cases when a
+     MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT error was encountered. Found and
+     fix proposed by Guido Vranken. #722
+   * Fixed the templates used to generate project and solution files for Visual
+     Studio 2015 as well as the files themselves, to remove a build warning
+     generated in Visual Studio 2015. Reported by Steve Valliere. #742
+   * Fix a resource leak in ssl_cookie, when using MBEDTLS_THREADING_C.
+     Raised and fix suggested by Alan Gillingham in the mbed TLS forum. #771
+   * Fix 1 byte buffer overflow in mbedtls_mpi_write_string() when the MPI
+     number to write in hexadecimal is negative and requires an odd number of
+     digits. Found and fixed by Guido Vranken.
+   * Fix unlisted DES configuration dependency in some pkparse test cases. Found
+     by inestlerode. #555
+
+= mbed TLS 2.4.1 branch released 2016-12-13
+
+Changes
+   * Update to CMAC test data, taken from - NIST Special Publication 800-38B -
+     Recommendation for Block Cipher Modes of Operation: The CMAC Mode for
+     Authentication – October  2016
+
+= mbed TLS 2.4.0 branch released 2016-10-17
+
+Security
+   * Removed the MBEDTLS_SSL_AEAD_RANDOM_IV option, because it was not compliant
+     with RFC-5116 and could lead to session key recovery in very long TLS
+     sessions. "Nonce-Disrespecting Adversaries Practical Forgery Attacks on GCM in
+     TLS" - H. Bock, A. Zauner, S. Devlin, J. Somorovsky, P. Jovanovic.
+     https://eprint.iacr.org/2016/475.pdf
+   * Fixed potential stack corruption in mbedtls_x509write_crt_der() and
+     mbedtls_x509write_csr_der() when the signature is copied to the buffer
+     without checking whether there is enough space in the destination. The
+     issue cannot be triggered remotely. Found by Jethro Beekman.
+
+Features
+   * Added support for CMAC for AES and 3DES and AES-CMAC-PRF-128, as defined by
+     NIST SP 800-38B, RFC-4493 and RFC-4615.
+   * Added hardware entropy selftest to verify that the hardware entropy source
+     is functioning correctly.
+   * Added a script to print build environment info for diagnostic use in test
+     scripts, which is also now called by all.sh.
+   * Added the macro MBEDTLS_X509_MAX_FILE_PATH_LEN that enables the user to
+     configure the maximum length of a file path that can be buffered when
+     calling mbedtls_x509_crt_parse_path().
+   * Added a configuration file config-no-entropy.h that configures the subset of
+     library features that do not require an entropy source.
+   * Added the macro MBEDTLS_ENTROPY_MIN_HARDWARE in config.h. This allows users
+     to configure the minimum number of bytes for entropy sources using the
+     mbedtls_hardware_poll() function.
+
+Bugfix
+   * Fix for platform time abstraction to avoid dependency issues where a build
+     may need time but not the standard C library abstraction, and added
+     configuration consistency checks to check_config.h
+   * Fix dependency issue in Makefile to allow parallel builds.
+   * Fix incorrect handling of block lengths in crypt_and_hash.c sample program,
+     when GCM is used. Found by udf2457. #441
+   * Fix for key exchanges based on ECDH-RSA or ECDH-ECDSA which weren't
+     enabled unless others were also present. Found by David Fernandez. #428
+   * Fix for out-of-tree builds using CMake. Found by jwurzer, and fix based on
+     a contribution from Tobias Tangemann. #541
+   * Fixed cert_app.c sample program for debug output and for use when no root
+     certificates are provided.
+   * Fix conditional statement that would cause a 1 byte overread in
+     mbedtls_asn1_get_int(). Found and fixed by Guido Vranken. #599
+   * Fixed pthread implementation to avoid unintended double initialisations
+     and double frees. Found by Niklas Amnebratt.
+   * Fixed the sample applications gen_key.c, cert_req.c and cert_write.c for
+     builds where the configuration MBEDTLS_PEM_WRITE_C is not defined. Found
+     by inestlerode. #559.
+   * Fix mbedtls_x509_get_sig() to update the ASN1 type in the mbedtls_x509_buf
+     data structure until after error checks are successful. Found by
+     subramanyam-c. #622
+   * Fix documentation and implementation missmatch for function arguments of
+     mbedtls_gcm_finish(). Found by cmiatpaar. #602
+   * Guarantee that P>Q at RSA key generation. Found by inestlerode. #558
+   * Fix potential byte overread when verifying malformed SERVER_HELLO in
+     ssl_parse_hello_verify_request() for DTLS. Found by Guido Vranken.
+   * Fix check for validity of date when parsing in mbedtls_x509_get_time().
+     Found by subramanyam-c. #626
+   * Fix compatibility issue with Internet Explorer client authentication,
+     where the limited hash choices prevented the client from sending its
+     certificate. Found by teumas. #513
+   * Fix compilation without MBEDTLS_SELF_TEST enabled.
+
+Changes
+   * Extended test coverage of special cases, and added new timing test suite.
+   * Removed self-tests from the basic-built-test.sh script, and added all
+     missing self-tests to the test suites, to ensure self-tests are only
+     executed once.
+   * Added support for 3 and 4 byte lengths to mbedtls_asn1_write_len().
+   * Added support for a Yotta specific configuration file -
+     through the symbol YOTTA_CFG_MBEDTLS_TARGET_CONFIG_FILE.
+   * Added optimization for code space for X.509/OID based on configured
+     features. Contributed by Aviv Palivoda.
+   * Renamed source file library/net.c to library/net_sockets.c to avoid
+     naming collision in projects which also have files with the common name
+     net.c. For consistency, the corresponding header file, net.h, is marked as
+     deprecated, and its contents moved to net_sockets.h.
+   * Changed the strategy for X.509 certificate parsing and validation, to no
+     longer disregard certificates with unrecognised fields.
+
+= mbed TLS 2.3.0 branch released 2016-06-28
+
+Security
+   * Fix missing padding length check in mbedtls_rsa_rsaes_pkcs1_v15_decrypt
+     required by PKCS1 v2.2
+   * Fix potential integer overflow to buffer overflow in
+     mbedtls_rsa_rsaes_pkcs1_v15_encrypt and mbedtls_rsa_rsaes_oaep_encrypt
+     (not triggerable remotely in (D)TLS).
+   * Fix a potential integer underflow to buffer overread in
+     mbedtls_rsa_rsaes_oaep_decrypt. It is not triggerable remotely in
+     SSL/TLS.
+
+Features
+   * Support for platform abstraction of the standard C library time()
+     function.
+
+Bugfix
+   * Fix bug in mbedtls_mpi_add_mpi() that caused wrong results when the three
+     arguments where the same (in-place doubling). Found and fixed by Janos
+     Follath. #309
+   * Fix potential build failures related to the 'apidoc' target, introduced
+     in the previous patch release. Found by Robert Scheck. #390 #391
+   * Fix issue in Makefile that prevented building using armar. #386
+   * Fix memory leak that occurred only when ECJPAKE was enabled and ECDHE and
+     ECDSA was disabled in config.h . The leak didn't occur by default.
+   * Fix an issue that caused valid certificates to be rejected whenever an
+     expired or not yet valid certificate was parsed before a valid certificate
+     in the trusted certificate list.
+   * Fix bug in mbedtls_x509_crt_parse that caused trailing extra data in the
+     buffer after DER certificates to be included in the raw representation.
+   * Fix issue that caused a hang when generating RSA keys of odd bitlength
+   * Fix bug in mbedtls_rsa_rsaes_pkcs1_v15_encrypt that made null pointer
+     dereference possible.
+   * Fix issue that caused a crash if invalid curves were passed to
+     mbedtls_ssl_conf_curves. #373
+   * Fix issue in ssl_fork_server which was preventing it from functioning. #429
+   * Fix memory leaks in test framework
+   * Fix test in ssl-opt.sh that does not run properly with valgrind
+   * Fix unchecked calls to mmbedtls_md_setup(). Fix by Brian Murray. #502
+
+Changes
+   * On ARM platforms, when compiling with -O0 with GCC, Clang or armcc5,
+     don't use the optimized assembly for bignum multiplication. This removes
+     the need to pass -fomit-frame-pointer to avoid a build error with -O0.
+   * Disabled SSLv3 in the default configuration.
+   * Optimized mbedtls_mpi_zeroize() for MPI integer size. (Fix by Alexey
+     Skalozub).
+   * Fix non-compliance server extension handling. Extensions for SSLv3 are now
+     ignored, as required by RFC6101.
+
+= mbed TLS 2.2.1 released 2016-01-05
+
+Security
+   * Fix potential double free when mbedtls_asn1_store_named_data() fails to
+     allocate memory. Only used for certificate generation, not triggerable
+     remotely in SSL/TLS. Found by Rafał Przywara. #367
+   * Disable MD5 handshake signatures in TLS 1.2 by default to prevent the
+     SLOTH attack on TLS 1.2 server authentication (other attacks from the
+     SLOTH paper do not apply to any version of mbed TLS or PolarSSL).
+     https://www.mitls.org/pages/attacks/SLOTH
+
+Bugfix
+   * Fix over-restrictive length limit in GCM. Found by Andreas-N. #362
+   * Fix bug in certificate validation that caused valid chains to be rejected
+     when the first intermediate certificate has pathLenConstraint=0. Found by
+     Nicholas Wilson. Introduced in mbed TLS 2.2.0. #280
+   * Removed potential leak in mbedtls_rsa_rsassa_pkcs1_v15_sign(), found by
+     JayaraghavendranK. #372
+   * Fix suboptimal handling of unexpected records that caused interop issues
+     with some peers over unreliable links. Avoid dropping an entire DTLS
+     datagram if a single record in a datagram is unexpected, instead only
+     drop the record and look at subsequent records (if any are present) in
+     the same datagram. Found by jeannotlapin. #345
+
+= mbed TLS 2.2.0 released 2015-11-04
+
+Security
+   * Fix potential double free if mbedtls_ssl_conf_psk() is called more than
+     once and some allocation fails. Cannot be forced remotely. Found by Guido
+     Vranken, Intelworks.
+   * Fix potential heap corruption on Windows when
+     mbedtls_x509_crt_parse_path() is passed a path longer than 2GB. Cannot be
+     triggered remotely. Found by Guido Vranken, Intelworks.
+   * Fix potential buffer overflow in some asn1_write_xxx() functions.
+     Cannot be triggered remotely unless you create X.509 certificates based
+     on untrusted input or write keys of untrusted origin. Found by Guido
+     Vranken, Intelworks.
+   * The X509 max_pathlen constraint was not enforced on intermediate
+     certificates. Found by Nicholas Wilson, fix and tests provided by
+     Janos Follath. #280 and #319
+
+Features
+   * Experimental support for EC J-PAKE as defined in Thread 1.0.0.
+     Disabled by default as the specification might still change.
+   * Added a key extraction callback to accees the master secret and key
+     block. (Potential uses include EAP-TLS and Thread.)
+
+Bugfix
+   * Self-signed certificates were not excluded from pathlen counting,
+     resulting in some valid X.509 being incorrectly rejected. Found and fix
+     provided by Janos Follath. #319
+   * Fix build error with configurations where ECDHE-PSK is the only key
+     exchange. Found and fix provided by Chris Hammond. #270
+   * Fix build error with configurations where RSA, RSA-PSK, ECDH-RSA or
+     ECHD-ECDSA if the only key exchange. Multiple reports. #310
+   * Fixed a bug causing some handshakes to fail due to some non-fatal alerts
+     not being properly ignored. Found by mancha and Kasom Koht-arsa, #308
+   * mbedtls_x509_crt_verify(_with_profile)() now also checks the key type and
+     size/curve against the profile. Before that, there was no way to set a
+     minimum key size for end-entity certificates with RSA keys. Found by
+     Matthew Page of Scannex Electronics Ltd.
+   * Fix failures in MPI on Sparc(64) due to use of bad assembly code.
+     Found by Kurt Danielson. #292
+   * Fix typo in name of the extKeyUsage OID. Found by inestlerode, #314
+   * Fix bug in ASN.1 encoding of booleans that caused generated CA
+     certificates to be rejected by some applications, including OS X
+     Keychain. Found and fixed by Jonathan Leroy, Inikup.
+
+Changes
+   * Improved performance of mbedtls_ecp_muladd() when one of the scalars is 1
+     or -1.
+
+= mbed TLS 2.1.2 released 2015-10-06
+
+Security
+   * Added fix for CVE-2015-5291 to prevent heap corruption due to buffer
+     overflow of the hostname or session ticket. Found by Guido Vranken,
+     Intelworks.
+   * Fix potential double-free if mbedtls_ssl_set_hs_psk() is called more than
+     once in the same handhake and mbedtls_ssl_conf_psk() was used.
+     Found and patch provided by Guido Vranken, Intelworks. Cannot be forced
+     remotely.
+   * Fix stack buffer overflow in pkcs12 decryption (used by
+     mbedtls_pk_parse_key(file)() when the password is > 129 bytes.
+     Found by Guido Vranken, Intelworks. Not triggerable remotely.
+   * Fix potential buffer overflow in mbedtls_mpi_read_string().
+     Found by Guido Vranken, Intelworks. Not exploitable remotely in the context
+     of TLS, but might be in other uses. On 32 bit machines, requires reading a
+     string of close to or larger than 1GB to exploit; on 64 bit machines, would
+     require reading a string of close to or larger than 2^62 bytes.
+   * Fix potential random memory allocation in mbedtls_pem_read_buffer()
+     on crafted PEM input data. Found and fix provided by Guido Vranken,
+     Intelworks. Not triggerable remotely in TLS. Triggerable remotely if you
+     accept PEM data from an untrusted source.
+   * Fix possible heap buffer overflow in base64_encoded() when the input
+     buffer is 512MB or larger on 32-bit platforms. Found by Guido Vranken,
+     Intelworks. Not trigerrable remotely in TLS.
+   * Fix potential double-free if mbedtls_conf_psk() is called repeatedly on
+     the same mbedtls_ssl_config object and memory allocation fails. Found by
+     Guido Vranken, Intelworks. Cannot be forced remotely.
+   * Fix potential heap buffer overflow in servers that perform client
+     authentication against a crafted CA cert. Cannot be triggered remotely
+     unless you allow third parties to pick trust CAs for client auth.
+     Found by Guido Vranken, Intelworks.
+
+Bugfix
+   * Fix compile error in net.c with musl libc. Found and patch provided by
+     zhasha (#278).
+   * Fix macroization of 'inline' keyword when building as C++. (#279)
+
+Changes
+   * Added checking of hostname length in mbedtls_ssl_set_hostname() to ensure
+     domain names are compliant with RFC 1035.
+   * Fixed paths for check_config.h in example config files. (Found by bachp)
+     (#291)
+
+= mbed TLS 2.1.1 released 2015-09-17
+
+Security
+   * Add countermeasure against Lenstra's RSA-CRT attack for PKCS#1 v1.5
+     signatures. (Found by Florian Weimer, Red Hat.)
+     https://securityblog.redhat.com/2015/09/02/factoring-rsa-keys-with-tls-perfect-forward-secrecy/
+   * Fix possible client-side NULL pointer dereference (read) when the client
+     tries to continue the handshake after it failed (a misuse of the API).
+     (Found and patch provided by Fabian Foerg, Gotham Digital Science using
+     afl-fuzz.)
+
+Bugfix
+   * Fix warning when using a 64bit platform. (found by embedthis) (#275)
+   * Fix off-by-one error in parsing Supported Point Format extension that
+     caused some handshakes to fail.
+
+Changes
+   * Made X509 profile pointer const in mbedtls_ssl_conf_cert_profile() to allow
+     use of mbedtls_x509_crt_profile_next. (found by NWilson)
+   * When a client initiates a reconnect from the same port as a live
+     connection, if cookie verification is available
+     (MBEDTLS_SSL_DTLS_HELLO_VERIFY defined in config.h, and usable cookie
+     callbacks set with mbedtls_ssl_conf_dtls_cookies()), this will be
+     detected and mbedtls_ssl_read() will return
+     MBEDTLS_ERR_SSL_CLIENT_RECONNECT - it is then possible to start a new
+     handshake with the same context. (See RFC 6347 section 4.2.8.)
+
+= mbed TLS 2.1.0 released 2015-09-04
+
+Features
+   * Added support for yotta as a build system.
+   * Primary open source license changed to Apache 2.0 license.
+
+Bugfix
+   * Fix segfault in the benchmark program when benchmarking DHM.
+   * Fix build error with CMake and pre-4.5 versions of GCC (found by Hugo
+     Leisink).
+   * Fix bug when parsing a ServerHello without extensions (found by David
+     Sears).
+   * Fix bug in CMake lists that caused libmbedcrypto.a not to be installed
+     (found by Benoit Lecocq).
+   * Fix bug in Makefile that caused libmbedcrypto and libmbedx509 not to be
+     installed (found by Rawi666).
+   * Fix compile error with armcc 5 with --gnu option.
+   * Fix bug in Makefile that caused programs not to be installed correctly
+     (found by robotanarchy) (#232).
+   * Fix bug in Makefile that prevented from installing without building the
+     tests (found by robotanarchy) (#232).
+   * Fix missing -static-libgcc when building shared libraries for Windows
+     with make.
+   * Fix link error when building shared libraries for Windows with make.
+   * Fix error when loading libmbedtls.so.
+   * Fix bug in mbedtls_ssl_conf_default() that caused the default preset to
+     be always used (found by dcb314) (#235)
+   * Fix bug in mbedtls_rsa_public() and mbedtls_rsa_private() that could
+     result trying to unlock an unlocked mutex on invalid input (found by
+     Fredrik Axelsson) (#257)
+   * Fix -Wshadow warnings (found by hnrkp) (#240)
+   * Fix memory corruption on client with overlong PSK identity, around
+     SSL_MAX_CONTENT_LEN or higher - not triggerrable remotely (found by
+     Aleksandrs Saveljevs) (#238)
+   * Fix unused function warning when using MBEDTLS_MDx_ALT or
+     MBEDTLS_SHAxxx_ALT (found by Henrik) (#239)
+   * Fix memory corruption in pkey programs (found by yankuncheng) (#210)
+
+Changes
+   * The PEM parser now accepts a trailing space at end of lines (#226).
+   * It is now possible to #include a user-provided configuration file at the
+     end of the default config.h by defining MBEDTLS_USER_CONFIG_FILE on the
+     compiler's command line.
+   * When verifying a certificate chain, if an intermediate certificate is
+     trusted, no later cert is checked. (suggested by hannes-landeholm)
+     (#220).
+   * Prepend a "thread identifier" to debug messages (issue pointed out by
+     Hugo Leisink) (#210).
+   * Add mbedtls_ssl_get_max_frag_len() to query the current maximum fragment
+     length.
+
+= mbed TLS 2.0.0 released 2015-07-13
+
+Features
+   * Support for DTLS 1.0 and 1.2 (RFC 6347).
+   * Ability to override core functions from MDx, SHAx, AES and DES modules
+     with custom implementation (eg hardware accelerated), complementing the
+     ability to override the whole module.
+   * New server-side implementation of session tickets that rotate keys to
+     preserve forward secrecy, and allows sharing across multiple contexts.
+   * Added a concept of X.509 cerificate verification profile that controls
+     which algorithms and key sizes (curves for ECDSA) are acceptable.
+   * Expanded configurability of security parameters in the SSL module with
+     mbedtls_ssl_conf_dhm_min_bitlen() and mbedtls_ssl_conf_sig_hashes().
+   * Introduced a concept of presets for SSL security-relevant configuration
+     parameters.
+
+API Changes
+   * The library has been split into libmbedcrypto, libmbedx509, libmbedtls.
+     You now need to link to all of them if you use TLS for example.
+   * All public identifiers moved to the mbedtls_* or MBEDTLS_* namespace.
+     Some names have been further changed to make them more consistent.
+     Migration helpers scripts/rename.pl and include/mbedtls/compat-1.3.h are
+     provided. Full list of renamings in scripts/data_files/rename-1.3-2.0.txt
+   * Renamings of fields inside structures, not covered by the previous list:
+     mbedtls_cipher_info_t.key_length -> key_bitlen
+     mbedtls_cipher_context_t.key_length -> key_bitlen
+     mbedtls_ecp_curve_info.size -> bit_size
+   * Headers are now found in the 'mbedtls' directory (previously 'polarssl').
+   * The following _init() functions that could return errors have
+     been split into an _init() that returns void and another function that
+     should generally be the first function called on this context after init:
+     mbedtls_ssl_init() -> mbedtls_ssl_setup()
+     mbedtls_ccm_init() -> mbedtls_ccm_setkey()
+     mbedtls_gcm_init() -> mbedtls_gcm_setkey()
+     mbedtls_hmac_drbg_init() -> mbedtls_hmac_drbg_seed(_buf)()
+     mbedtls_ctr_drbg_init()  -> mbedtls_ctr_drbg_seed()
+     Note that for mbedtls_ssl_setup(), you need to be done setting up the
+     ssl_config structure before calling it.
+   * Most ssl_set_xxx() functions (all except ssl_set_bio(), ssl_set_hostname(),
+     ssl_set_session() and ssl_set_client_transport_id(), plus
+     ssl_legacy_renegotiation()) have been renamed to mbedtls_ssl_conf_xxx()
+     (see rename.pl and compat-1.3.h above) and their first argument's type
+     changed from ssl_context to ssl_config.
+   * ssl_set_bio() changed signature (contexts merged, order switched, one
+     additional callback for read-with-timeout).
+   * The following functions have been introduced and must be used in callback
+     implementations (SNI, PSK) instead of their *conf counterparts:
+     mbedtls_ssl_set_hs_own_cert()
+     mbedtls_ssl_set_hs_ca_chain()
+     mbedtls_ssl_set_hs_psk()
+   * mbedtls_ssl_conf_ca_chain() lost its last argument (peer_cn), now set
+     using mbedtls_ssl_set_hostname().
+   * mbedtls_ssl_conf_session_cache() changed prototype (only one context
+     pointer, parameters reordered).
+   * On server, mbedtls_ssl_conf_session_tickets_cb() must now be used in
+     place of mbedtls_ssl_conf_session_tickets() to enable session tickets.
+   * The SSL debug callback gained two new arguments (file name, line number).
+   * Debug modes were removed.
+   * mbedtls_ssl_conf_truncated_hmac() now returns void.
+   * mbedtls_memory_buffer_alloc_init() now returns void.
+   * X.509 verification flags are now an uint32_t. Affect the signature of:
+     mbedtls_ssl_get_verify_result()
+     mbedtls_x509_ctr_verify_info()
+     mbedtls_x509_crt_verify() (flags, f_vrfy -> needs to be updated)
+     mbedtls_ssl_conf_verify() (f_vrfy -> needs to be updated)
+   * The following functions changed prototype to avoid an in-out length
+     parameter:
+     mbedtls_base64_encode()
+     mbedtls_base64_decode()
+     mbedtls_mpi_write_string()
+     mbedtls_dhm_calc_secret()
+   * In the NET module, all "int" and "int *" arguments for file descriptors
+     changed type to "mbedtls_net_context *".
+   * net_accept() gained new arguments for the size of the client_ip buffer.
+   * In the threading layer, mbedtls_mutex_init() and mbedtls_mutex_free() now
+     return void.
+   * ecdsa_write_signature() gained an additional md_alg argument and
+     ecdsa_write_signature_det() was deprecated.
+   * pk_sign() no longer accepts md_alg == POLARSSL_MD_NONE with ECDSA.
+   * Last argument of x509_crt_check_key_usage() and
+     mbedtls_x509write_crt_set_key_usage() changed from int to unsigned.
+   * test_ca_list (from certs.h) is renamed to test_cas_pem and is only
+     available if POLARSSL_PEM_PARSE_C is defined (it never worked without).
+   * Test certificates in certs.c are no longer guaranteed to be nul-terminated
+     strings; use the new *_len variables instead of strlen().
+   * Functions mbedtls_x509_xxx_parse(), mbedtls_pk_parse_key(),
+     mbedtls_pk_parse_public_key() and mbedtls_dhm_parse_dhm() now expect the
+     length parameter to include the terminating null byte for PEM input.
+   * Signature of mpi_mul_mpi() changed to make the last argument unsigned
+   * calloc() is now used instead of malloc() everywhere. API of platform
+     layer and the memory_buffer_alloc module changed accordingly.
+     (Thanks to Mansour Moufid for helping with the replacement.)
+   * Change SSL_DISABLE_RENEGOTIATION config.h flag to SSL_RENEGOTIATION
+     (support for renegotiation now needs explicit enabling in config.h).
+   * Split MBEDTLS_HAVE_TIME into MBEDTLS_HAVE_TIME and MBEDTLS_HAVE_TIME_DATE
+     in config.h
+   * net_connect() and net_bind() have a new 'proto' argument to choose
+     between TCP and UDP, using the macros NET_PROTO_TCP or NET_PROTO_UDP.
+     Their 'port' argument type is changed to a string.
+   * Some constness fixes
+
+Removals
+   * Removed mbedtls_ecp_group_read_string(). Only named groups are supported.
+   * Removed mbedtls_ecp_sub() and mbedtls_ecp_add(), use
+     mbedtls_ecp_muladd().
+   * Removed individual mdX_hmac, shaX_hmac, mdX_file and shaX_file functions
+     (use generic functions from md.h)
+   * Removed mbedtls_timing_msleep(). Use mbedtls_net_usleep() or a custom
+     waiting function.
+   * Removed test DHM parameters from the test certs module.
+   * Removed the PBKDF2 module (use PKCS5).
+   * Removed POLARSSL_ERROR_STRERROR_BC (use mbedtls_strerror()).
+   * Removed compat-1.2.h (helper for migrating from 1.2 to 1.3).
+   * Removed openssl.h (very partial OpenSSL compatibility layer).
+   * Configuration options POLARSSL_HAVE_LONGLONG was removed (now always on).
+   * Configuration options POLARSSL_HAVE_INT8 and POLARSSL_HAVE_INT16 have
+     been removed (compiler is required to support 32-bit operations).
+   * Configuration option POLARSSL_HAVE_IPV6 was removed (always enabled).
+   * Removed test program o_p_test, the script compat.sh does more.
+   * Removed test program ssl_test, superseded by ssl-opt.sh.
+   * Removed helper script active-config.pl
+
+New deprecations
+   * md_init_ctx() is deprecated in favour of md_setup(), that adds a third
+     argument (allowing memory savings if HMAC is not used)
+
+Semi-API changes (technically public, morally private)
+   * Renamed a few headers to include _internal in the name. Those headers are
+     not supposed to be included by users.
+   * Changed md_info_t into an opaque structure (use md_get_xxx() accessors).
+   * Changed pk_info_t into an opaque structure.
+   * Changed cipher_base_t into an opaque structure.
+   * Removed sig_oid2 and rename sig_oid1 to sig_oid in x509_crt and x509_crl.
+   * x509_crt.key_usage changed from unsigned char to unsigned int.
+   * Removed r and s from ecdsa_context
+   * Removed mode from des_context and des3_context
+
+Default behavior changes
+   * The default minimum TLS version is now TLS 1.0.
+   * RC4 is now blacklisted by default in the SSL/TLS layer, and excluded from the
+     default ciphersuite list returned by ssl_list_ciphersuites()
+   * Support for receiving SSLv2 ClientHello is now disabled by default at
+     compile time.
+   * The default authmode for SSL/TLS clients is now REQUIRED.
+   * Support for RSA_ALT contexts in the PK layer is now optional. Since is is
+     enabled in the default configuration, this is only noticeable if using a
+     custom config.h
+   * Default DHM parameters server-side upgraded from 1024 to 2048 bits.
+   * A minimum RSA key size of 2048 bits is now enforced during ceritificate
+     chain verification.
+   * Negotiation of truncated HMAC is now disabled by default on server too.
+   * The following functions are now case-sensitive:
+     mbedtls_cipher_info_from_string()
+     mbedtls_ecp_curve_info_from_name()
+     mbedtls_md_info_from_string()
+     mbedtls_ssl_ciphersuite_from_string()
+     mbedtls_version_check_feature()
+
+Requirement changes
+   * The minimum MSVC version required is now 2010 (better C99 support).
+   * The NET layer now unconditionnaly relies on getaddrinfo() and select().
+   * Compiler is required to support C99 types such as long long and uint32_t.
+
+API changes from the 1.4 preview branch
+   * ssl_set_bio_timeout() was removed, split into mbedtls_ssl_set_bio() with
+     new prototype, and mbedtls_ssl_set_read_timeout().
+   * The following functions now return void:
+     mbedtls_ssl_conf_transport()
+     mbedtls_ssl_conf_max_version()
+     mbedtls_ssl_conf_min_version()
+   * DTLS no longer hard-depends on TIMING_C, but uses a callback interface
+     instead, see mbedtls_ssl_set_timer_cb(), with the Timing module providing
+     an example implementation, see mbedtls_timing_delay_context and
+     mbedtls_timing_set/get_delay().
+   * With UDP sockets, it is no longer necessary to call net_bind() again
+     after a successful net_accept().
+
+Changes
+   * mbedtls_ctr_drbg_random() and mbedtls_hmac_drbg_random() are now
+     thread-safe if MBEDTLS_THREADING_C is enabled.
+   * Reduced ROM fooprint of SHA-256 and added an option to reduce it even
+     more (at the expense of performance) MBEDTLS_SHA256_SMALLER.
+
+= mbed TLS 1.3 branch
+
+Security
+   * With authmode set to SSL_VERIFY_OPTIONAL, verification of keyUsage and
+     extendedKeyUsage on the leaf certificate was lost (results not accessible
+     via ssl_get_verify_results()).
+   * Add countermeasure against "Lucky 13 strikes back" cache-based attack,
+     https://dl.acm.org/citation.cfm?id=2714625
+
+Features
+   * Improve ECC performance by using more efficient doubling formulas
+     (contributed by Peter Dettman).
+   * Add x509_crt_verify_info() to display certificate verification results.
+   * Add support for reading DH parameters with privateValueLength included
+     (contributed by Daniel Kahn Gillmor).
+   * Add support for bit strings in X.509 names (request by Fredrik Axelsson).
+   * Add support for id-at-uniqueIdentifier in X.509 names.
+   * Add support for overriding snprintf() (except on Windows) and exit() in
+     the platform layer.
+   * Add an option to use macros instead of function pointers in the platform
+     layer (helps get rid of unwanted references).
+   * Improved Makefiles for Windows targets by fixing library targets and making
+     cross-compilation easier (thanks to Alon Bar-Lev).
+   * The benchmark program also prints heap usage for public-key primitives
+     if POLARSSL_MEMORY_BUFFER_ALLOC_C and POLARSSL_MEMORY_DEBUG are defined.
+   * New script ecc-heap.sh helps measuring the impact of ECC parameters on
+     speed and RAM (heap only for now) usage.
+   * New script memory.sh helps measuring the ROM and RAM requirements of two
+     reduced configurations (PSK-CCM and NSA suite B).
+   * Add config flag POLARSSL_DEPRECATED_WARNING (off by default) to produce
+     warnings on use of deprecated functions (with GCC and Clang only).
+   * Add config flag POLARSSL_DEPRECATED_REMOVED (off by default) to produce
+     errors on use of deprecated functions.
+
+Bugfix
+   * Fix compile errors with PLATFORM_NO_STD_FUNCTIONS.
+   * Fix compile error with PLATFORM_EXIT_ALT (thanks to Rafał Przywara).
+   * Fix bug in entropy.c when THREADING_C is also enabled that caused
+     entropy_free() to crash (thanks to Rafał Przywara).
+   * Fix memory leak when gcm_setkey() and ccm_setkey() are used more than
+     once on the same context.
+   * Fix bug in ssl_mail_client when password is longer that username (found
+     by Bruno Pape).
+   * Fix undefined behaviour (memcmp( NULL, NULL, 0 );) in X.509 modules
+     (detected by Clang's 3.6 UBSan).
+   * mpi_size() and mpi_msb() would segfault when called on an mpi that is
+     initialized but not set (found by pravic).
+   * Fix detection of support for getrandom() on Linux (reported by syzzer) by
+     doing it at runtime (using uname) rather that compile time.
+   * Fix handling of symlinks by "make install" (found by Gaël PORTAY).
+   * Fix potential NULL pointer dereference (not trigerrable remotely) when
+     ssl_write() is called before the handshake is finished (introduced in
+     1.3.10) (first reported by Martin Blumenstingl).
+   * Fix bug in pk_parse_key() that caused some valid private EC keys to be
+     rejected.
+   * Fix bug in Via Padlock support (found by Nikos Mavrogiannopoulos).
+   * Fix thread safety bug in RSA operations (found by Fredrik Axelsson).
+   * Fix hardclock() (only used in the benchmarking program) with some
+     versions of mingw64 (found by kxjhlele).
+   * Fix warnings from mingw64 in timing.c (found by kxjklele).
+   * Fix potential unintended sign extension in asn1_get_len() on 64-bit
+     platforms.
+   * Fix potential memory leak in ssl_set_psk() (found by Mansour Moufid).
+   * Fix compile error when POLARSSL_SSL_DISABLE_RENEGOTATION and
+     POLARSSL_SSL_SSESSION_TICKETS where both enabled in config.h (introduced
+     in 1.3.10).
+   * Add missing extern "C" guard in aesni.h (reported by amir zamani).
+   * Add missing dependency on SHA-256 in some x509 programs (reported by
+     Gergely Budai).
+   * Fix bug related to ssl_set_curves(): the client didn't check that the
+     curve picked by the server was actually allowed.
+
+Changes
+   * Remove bias in mpi_gen_prime (contributed by Pascal Junod).
+   * Remove potential sources of timing variations (some contributed by Pascal
+     Junod).
+   * Options POLARSSL_HAVE_INT8 and POLARSSL_HAVE_INT16 are deprecated.
+   * Enabling POLARSSL_NET_C without POLARSSL_HAVE_IPV6 is deprecated.
+   * compat-1.2.h and openssl.h are deprecated.
+   * Adjusting/overriding CFLAGS and LDFLAGS with the make build system is now
+     more flexible (warning: OFLAGS is not used any more) (see the README)
+     (contributed by Alon Bar-Lev).
+   * ssl_set_own_cert() no longer calls pk_check_pair() since the
+     performance impact was bad for some users (this was introduced in 1.3.10).
+   * Move from SHA-1 to SHA-256 in example programs using signatures
+     (suggested by Thorsten Mühlfelder).
+   * Remove some unneeded inclusions of header files from the standard library
+     "minimize" others (eg use stddef.h if only size_t is needed).
+   * Change #include lines in test files to use double quotes instead of angle
+     brackets for uniformity with the rest of the code.
+   * Remove dependency on sscanf() in X.509 parsing modules.
+
+= mbed TLS 1.3.10 released 2015-02-09
+Security
+   * NULL pointer dereference in the buffer-based allocator when the buffer is
+     full and polarssl_free() is called (found by Mark Hasemeyer)
+     (only possible if POLARSSL_MEMORY_BUFFER_ALLOC_C is enabled, which it is
+     not by default).
+   * Fix remotely-triggerable uninitialised pointer dereference caused by
+     crafted X.509 certificate (TLS server is not affected if it doesn't ask for a
+     client certificate) (found using Codenomicon Defensics).
+   * Fix remotely-triggerable memory leak caused by crafted X.509 certificates
+     (TLS server is not affected if it doesn't ask for a client certificate)
+     (found using Codenomicon Defensics).
+   * Fix potential stack overflow while parsing crafted X.509 certificates
+     (TLS server is not affected if it doesn't ask for a client certificate)
+     (found using Codenomicon Defensics).
+   * Fix timing difference that could theoretically lead to a
+     Bleichenbacher-style attack in the RSA and RSA-PSK key exchanges
+     (reported by Sebastian Schinzel).
+
+Features
+   * Add support for FALLBACK_SCSV (draft-ietf-tls-downgrade-scsv).
+   * Add support for Extended Master Secret (draft-ietf-tls-session-hash).
+   * Add support for Encrypt-then-MAC (RFC 7366).
+   * Add function pk_check_pair() to test if public and private keys match.
+   * Add x509_crl_parse_der().
+   * Add compile-time option POLARSSL_X509_MAX_INTERMEDIATE_CA to limit the
+     length of an X.509 verification chain.
+   * Support for renegotiation can now be disabled at compile-time
+   * Support for 1/n-1 record splitting, a countermeasure against BEAST.
+   * Certificate selection based on signature hash, preferring SHA-1 over SHA-2
+     for pre-1.2 clients when multiple certificates are available.
+   * Add support for getrandom() syscall on recent Linux kernels with Glibc or
+     a compatible enough libc (eg uClibc).
+   * Add ssl_set_arc4_support() to make it easier to disable RC4 at runtime
+     while using the default ciphersuite list.
+   * Added new error codes and debug messages about selection of
+     ciphersuite/certificate.
+
+Bugfix
+   * Stack buffer overflow if ctr_drbg_update() is called with too large
+     add_len (found by Jean-Philippe Aumasson) (not triggerable remotely).
+   * Possible buffer overflow of length at most POLARSSL_MEMORY_ALIGN_MULTIPLE
+     if memory_buffer_alloc_init() was called with buf not aligned and len not
+     a multiple of POLARSSL_MEMORY_ALIGN_MULTIPLE (not triggerable remotely).
+   * User set CFLAGS were ignored by Cmake with gcc (introduced in 1.3.9, found
+     by Julian Ospald).
+   * Fix potential undefined behaviour in Camellia.
+   * Fix potential failure in ECDSA signatures when POLARSSL_ECP_MAX_BITS is a
+     multiple of 8 (found by Gergely Budai).
+   * Fix unchecked return code in x509_crt_parse_path() on Windows (found by
+     Peter Vaskovic).
+   * Fix assembly selection for MIPS64 (thanks to James Cowgill).
+   * ssl_get_verify_result() now works even if the handshake was aborted due
+     to a failed verification (found by Fredrik Axelsson).
+   * Skip writing and parsing signature_algorithm extension if none of the
+     key exchanges enabled needs certificates. This fixes a possible interop
+     issue with some servers when a zero-length extension was sent. (Reported
+     by Peter Dettman.)
+   * On a 0-length input, base64_encode() did not correctly set output length
+     (found by Hendrik van den Boogaard).
+
+Changes
+   * Use deterministic nonces for AEAD ciphers in TLS by default (possible to
+     switch back to random with POLARSSL_SSL_AEAD_RANDOM_IV in config.h).
+   * Blind RSA private operations even when POLARSSL_RSA_NO_CRT is defined.
+   * ssl_set_own_cert() now returns an error on key-certificate mismatch.
+   * Forbid repeated extensions in X.509 certificates.
+   * debug_print_buf() now prints a text view in addition to hexadecimal.
+   * A specific error is now returned when there are ciphersuites in common
+     but none of them is usable due to external factors such as no certificate
+     with a suitable (extended)KeyUsage or curve or no PSK set.
+   * It is now possible to disable negotiation of truncated HMAC server-side
+     at runtime with ssl_set_truncated_hmac().
+   * Example programs for SSL client and server now disable SSLv3 by default.
+   * Example programs for SSL client and server now disable RC4 by default.
+   * Use platform.h in all test suites and programs.
+
+= PolarSSL 1.3.9 released 2014-10-20
+Security
+   * Lowest common hash was selected from signature_algorithms extension in
+     TLS 1.2 (found by Darren Bane) (introduced in 1.3.8).
+   * Remotely-triggerable memory leak when parsing some X.509 certificates
+     (server is not affected if it doesn't ask for a client certificate)
+     (found using Codenomicon Defensics).
+   * Remotely-triggerable memory leak when parsing crafted ClientHello
+     (not affected if ECC support was compiled out) (found using Codenomicon
+     Defensics).
+
+Bugfix
+   * Support escaping of commas in x509_string_to_names()
+   * Fix compile error in ssl_pthread_server (found by Julian Ospald).
+   * Fix net_accept() regarding non-blocking sockets (found by Luca Pesce).
+   * Don't print uninitialised buffer in ssl_mail_client (found by Marc Abel).
+   * Fix warnings from Clang's scan-build (contributed by Alfred Klomp).
+   * Fix compile error in timing.c when POLARSSL_NET_C and POLARSSL_SELFTEST
+     are defined but not POLARSSL_HAVE_TIME (found by Stephane Di Vito).
+   * Remove non-existent file from VS projects (found by Peter Vaskovic).
+   * ssl_read() could return non-application data records on server while
+     renegotation was pending, and on client when a HelloRequest was received.
+   * Server-initiated renegotiation would fail with non-blocking I/O if the
+     write callback returned WANT_WRITE when requesting renegotiation.
+   * ssl_close_notify() could send more than one message in some circumstances
+     with non-blocking I/O.
+   * Fix compiler warnings on iOS (found by Sander Niemeijer).
+   * x509_crt_parse() did not increase total_failed on PEM error
+   * Fix compile error with armcc in mpi_is_prime()
+   * Fix potential bad read in parsing ServerHello (found by Adrien
+     Vialletelle).
+
+Changes
+   * Ciphersuites using SHA-256 or SHA-384 now require TLS 1.x (there is no
+     standard defining how to use SHA-2 with SSL 3.0).
+   * Ciphersuites using RSA-PSK key exchange new require TLS 1.x (the spec is
+     ambiguous on how to encode some packets with SSL 3.0).
+   * Made buffer size in pk_write_(pub)key_pem() more dynamic, eg smaller if
+     RSA is disabled, larger if POLARSSL_MPI_MAX_SIZE is larger.
+   * ssl_read() now returns POLARSSL_ERR_NET_WANT_READ rather than
+     POLARSSL_ERR_SSL_UNEXPECTED_MESSAGE on harmless alerts.
+   * POLARSSL_MPI_MAX_SIZE now defaults to 1024 in order to allow 8192 bits
+     RSA keys.
+   * Accept spaces at end of line or end of buffer in base64_decode().
+   * X.509 certificates with more than one AttributeTypeAndValue per
+     RelativeDistinguishedName are not accepted any more.
+
+= PolarSSL 1.3.8 released 2014-07-11
+Security
+   * Fix length checking for AEAD ciphersuites (found by Codenomicon).
+     It was possible to crash the server (and client) using crafted messages
+     when a GCM suite was chosen.
+
+Features
+   * Add CCM module and cipher mode to Cipher Layer
+   * Support for CCM and CCM_8 ciphersuites
+   * Support for parsing and verifying RSASSA-PSS signatures in the X.509
+     modules (certificates, CRLs and CSRs).
+   * Blowfish in the cipher layer now supports variable length keys.
+   * Add example config.h for PSK with CCM, optimized for low RAM usage.
+   * Optimize for RAM usage in example config.h for NSA Suite B profile.
+   * Add POLARSSL_REMOVE_ARC4_CIPHERSUITES to allow removing RC4 ciphersuites
+     from the default list (inactive by default).
+   * Add server-side enforcement of sent renegotiation requests
+     (ssl_set_renegotiation_enforced())
+   * Add SSL_CIPHERSUITES config.h flag to allow specifying a list of
+     ciphersuites to use and save some memory if the list is small.
+
+Changes
+   * Add LINK_WITH_PTHREAD option in CMake for explicit linking that is
+     required on some platforms (e.g. OpenBSD)
+   * Migrate zeroizing of data to polarssl_zeroize() instead of memset()
+     against unwanted compiler optimizations
+   * md_list() now returns hashes strongest first
+   * Selection of hash for signing ServerKeyExchange in TLS 1.2 now picks
+     strongest offered by client.
+   * All public contexts have _init() and _free() functions now for simpler
+     usage pattern
+
+Bugfix
+   * Fix in debug_print_msg()
+   * Enforce alignment in the buffer allocator even if buffer is not aligned
+   * Remove less-than-zero checks on unsigned numbers
+   * Stricter check on SSL ClientHello internal sizes compared to actual packet
+     size (found by TrustInSoft)
+   * Fix WSAStartup() return value check (found by Peter Vaskovic)
+   * Other minor issues (found by Peter Vaskovic)
+   * Fix symlink command for cross compiling with CMake (found by Andre
+     Heinecke)
+   * Fix DER output of gen_key app (found by Gergely Budai)
+   * Very small records were incorrectly rejected when truncated HMAC was in
+     use with some ciphersuites and versions (RC4 in all versions, CBC with
+     versions < TLS 1.1).
+   * Very large records using more than 224 bytes of padding were incorrectly
+     rejected with CBC-based ciphersuites and TLS >= 1.1
+   * Very large records using less padding could cause a buffer overread of up
+     to 32 bytes with CBC-based ciphersuites and TLS >= 1.1
+   * Restore ability to use a v1 cert as a CA if trusted locally. (This had
+     been removed in 1.3.6.)
+   * Restore ability to locally trust a self-signed cert that is not a proper
+     CA for use as an end entity certificate. (This had been removed in
+     1.3.6.)
+   * Fix preprocessor checks for bn_mul PPC asm (found by Barry K. Nathan).
+   * Use \n\t rather than semicolons for bn_mul asm, since some assemblers
+     interpret semicolons as comment delimiters (found by Barry K. Nathan).
+   * Fix off-by-one error in parsing Supported Point Format extension that
+     caused some handshakes to fail.
+   * Fix possible miscomputation of the premaster secret with DHE-PSK key
+     exchange that caused some handshakes to fail with other implementations.
+     (Failure rate <= 1/255 with common DHM moduli.)
+   * Disable broken Sparc64 bn_mul assembly (found by Florian Obser).
+   * Fix base64_decode() to return and check length correctly (in case of
+     tight buffers)
+   * Fix mpi_write_string() to write "00" as hex output for empty MPI (found
+     by Hui Dong)
+
+= PolarSSL 1.3.7 released on 2014-05-02
+Features
+   * debug_set_log_mode() added to determine raw or full logging
+   * debug_set_threshold() added to ignore messages over threshold level
+   * version_check_feature() added to check for compile-time options at
+     run-time
+
+Changes
+   * POLARSSL_CONFIG_OPTIONS has been removed. All values are individually
+     checked and filled in the relevant module headers
+   * Debug module only outputs full lines instead of parts
+   * Better support for the different Attribute Types from IETF PKIX (RFC 5280)
+   * AES-NI now compiles with "old" assemblers too
+   * Ciphersuites based on RC4 now have the lowest priority by default
+
+Bugfix
+   * Only iterate over actual certificates in ssl_write_certificate_request()
+     (found by Matthew Page)
+   * Typos in platform.c and pkcs11.c (found by Daniel Phillips and Steffan
+     Karger)
+   * cert_write app should use subject of issuer certificate as issuer of cert
+   * Fix false reject in padding check in ssl_decrypt_buf() for CBC
+     ciphersuites, for full SSL frames of data.
+   * Improve interoperability by not writing extension length in ClientHello /
+     ServerHello when no extensions are present (found by Matthew Page)
+   * rsa_check_pubkey() now allows an E up to N
+   * On OpenBSD, use arc4random_buf() instead of rand() to prevent warnings
+   * mpi_fill_random() was creating numbers larger than requested on
+     big-endian platform when size was not an integer number of limbs
+   * Fix dependencies issues in X.509 test suite.
+   * Some parts of ssl_tls.c were compiled even when the module was disabled.
+   * Fix detection of DragonflyBSD in net.c (found by Markus Pfeiffer)
+   * Fix detection of Clang on some Apple platforms with CMake
+     (found by Barry K. Nathan)
+
+= PolarSSL 1.3.6 released on 2014-04-11
+
+Features
+   * Support for the ALPN SSL extension
+   * Add option 'use_dev_random' to gen_key application
+   * Enable verification of the keyUsage extension for CA and leaf
+     certificates (POLARSSL_X509_CHECK_KEY_USAGE)
+   * Enable verification of the extendedKeyUsage extension
+     (POLARSSL_X509_CHECK_EXTENDED_KEY_USAGE)
+
+Changes
+   * x509_crt_info() now prints information about parsed extensions as well
+   * pk_verify() now returns a specific error code when the signature is valid
+     but shorter than the supplied length.
+   * Use UTC time to check certificate validity.
+   * Reject certificates with times not in UTC, per RFC 5280.
+
+Security
+   * Avoid potential timing leak in ecdsa_sign() by blinding modular division.
+     (Found by Watson Ladd.)
+   * The notAfter date of some certificates was no longer checked since 1.3.5.
+     This affects certificates in the user-supplied chain except the top
+     certificate. If the user-supplied chain contains only one certificates,
+     it is not affected (ie, its notAfter date is properly checked).
+   * Prevent potential NULL pointer dereference in ssl_read_record() (found by
+     TrustInSoft)
+
+Bugfix
+   * The length of various ClientKeyExchange messages was not properly checked.
+   * Some example server programs were not sending the close_notify alert.
+   * Potential memory leak in mpi_exp_mod() when error occurs during
+     calculation of RR.
+   * Fixed malloc/free default #define in platform.c (found by Gergely Budai).
+   * Fixed type which made POLARSSL_ENTROPY_FORCE_SHA256 uneffective (found by
+     Gergely Budai).
+   * Fix #include path in ecdsa.h which wasn't accepted by some compilers.
+     (found by Gergely Budai)
+   * Fix compile errors when POLARSSL_ERROR_STRERROR_BC is undefined (found by
+     Shuo Chen).
+   * oid_get_numeric_string() used to truncate the output without returning an
+     error if the output buffer was just 1 byte too small.
+   * dhm_parse_dhm() (hence dhm_parse_dhmfile()) did not set dhm->len.
+   * Calling pk_debug() on an RSA-alt key would segfault.
+   * pk_get_size() and pk_get_len() were off by a factor 8 for RSA-alt keys.
+   * Potential buffer overwrite in pem_write_buffer() because of low length
+     indication (found by Thijs Alkemade)
+   * EC curves constants, which should be only in ROM since 1.3.3, were also
+     stored in RAM due to missing 'const's (found by Gergely Budai).
+
+= PolarSSL 1.3.5 released on 2014-03-26
+Features
+   * HMAC-DRBG as a separate module
+   * Option to set the Curve preference order (disabled by default)
+   * Single Platform compatilibity layer (for memory / printf / fprintf)
+   * Ability to provide alternate timing implementation
+   * Ability to force the entropy module to use SHA-256 as its basis
+     (POLARSSL_ENTROPY_FORCE_SHA256)
+   * Testing script ssl-opt.sh added for testing 'live' ssl option
+     interoperability against OpenSSL and PolarSSL
+   * Support for reading EC keys that use SpecifiedECDomain in some cases.
+   * Entropy module now supports seed writing and reading
+
+Changes
+   * Deprecated the Memory layer
+   * entropy_add_source(), entropy_update_manual() and entropy_gather()
+     now thread-safe if POLARSSL_THREADING_C defined
+   * Improvements to the CMake build system, contributed by Julian Ospald.
+   * Work around a bug of the version of Clang shipped by Apple with Mavericks
+     that prevented bignum.c from compiling. (Reported by Rafael Baptista.)
+   * Revamped the compat.sh interoperatibility script to include support for
+     testing against GnuTLS
+   * Deprecated ssl_set_own_cert_rsa() and ssl_set_own_cert_rsa_alt()
+   * Improvements to tests/Makefile, contributed by Oden Eriksson.
+
+Security
+   * Forbid change of server certificate during renegotiation to prevent
+     "triple handshake" attack when authentication mode is 'optional' (the
+     attack was already impossible when authentication is required).
+   * Check notBefore timestamp of certificates and CRLs from the future.
+   * Forbid sequence number wrapping
+   * Fixed possible buffer overflow with overlong PSK
+   * Possible remotely-triggered out-of-bounds memory access fixed (found by
+     TrustInSoft)
+
+Bugfix
+   * ecp_gen_keypair() does more tries to prevent failure because of
+     statistics
+   * Fixed bug in RSA PKCS#1 v1.5 "reversed" operations
+   * Fixed testing with out-of-source builds using cmake
+   * Fixed version-major intolerance in server
+   * Fixed CMake symlinking on out-of-source builds
+   * Fixed dependency issues in test suite
+   * Programs rsa_sign_pss and rsa_verify_pss were not using PSS since 1.3.0
+   * Bignum's MIPS-32 assembly was used on MIPS-64, causing chaos. (Found by
+     Alex Wilson.)
+   * ssl_cache was creating entries when max_entries=0 if TIMING_C was enabled.
+   * m_sleep() was sleeping twice too long on most Unix platforms.
+   * Fixed bug with session tickets and non-blocking I/O in the unlikely case
+     send() would return an EAGAIN error when sending the ticket.
+   * ssl_cache was leaking memory when reusing a timed out entry containing a
+     client certificate.
+   * ssl_srv was leaking memory when client presented a timed out ticket
+     containing a client certificate
+   * ssl_init() was leaving a dirty pointer in ssl_context if malloc of
+     out_ctr failed
+   * ssl_handshake_init() was leaving dirty pointers in subcontexts if malloc
+     of one of them failed
+   * Fix typo in rsa_copy() that impacted PKCS#1 v2 contexts
+   * x509_get_current_time() uses localtime_r() to prevent thread issues
+
+= PolarSSL 1.3.4 released on 2014-01-27
+Features
+   * Support for the Koblitz curves: secp192k1, secp224k1, secp256k1
+   * Support for RIPEMD-160
+   * Support for AES CFB8 mode
+   * Support for deterministic ECDSA (RFC 6979)
+
+Bugfix
+   * Potential memory leak in bignum_selftest()
+   * Replaced expired test certificate
+   * ssl_mail_client now terminates lines with CRLF, instead of LF
+   * net module handles timeouts on blocking sockets better (found by Tilman
+     Sauerbeck)
+   * Assembly format fixes in bn_mul.h
+
+Security
+   * Missing MPI_CHK calls added around unguarded mpi calls (found by
+     TrustInSoft)
+
+= PolarSSL 1.3.3 released on 2013-12-31
+Features
+   * EC key generation support in gen_key app
+   * Support for adhering to client ciphersuite order preference
+     (POLARSSL_SSL_SRV_RESPECT_CLIENT_PREFERENCE)
+   * Support for Curve25519
+   * Support for ECDH-RSA and ECDH-ECDSA key exchanges and ciphersuites
+   * Support for IPv6 in the NET module
+   * AES-NI support for AES, AES-GCM and AES key scheduling
+   * SSL Pthread-based server example added (ssl_pthread_server)
+
+Changes
+   * gen_prime() speedup
+   * Speedup of ECP multiplication operation
+   * Relaxed some SHA2 ciphersuite's version requirements
+   * Dropped use of readdir_r() instead of readdir() with threading support
+   * More constant-time checks in the RSA module
+   * Split off curves from ecp.c into ecp_curves.c
+   * Curves are now stored fully in ROM
+   * Memory usage optimizations in ECP module
+   * Removed POLARSSL_THREADING_DUMMY
+
+Bugfix
+   * Fixed bug in mpi_set_bit() on platforms where t_uint is wider than int
+   * Fixed X.509 hostname comparison (with non-regular characters)
+   * SSL now gracefully handles missing RNG
+   * Missing defines / cases for RSA_PSK key exchange
+   * crypt_and_hash app checks MAC before final decryption
+   * Potential memory leak in ssl_ticket_keys_init()
+   * Memory leak in benchmark application
+   * Fixed x509_crt_parse_path() bug on Windows platforms
+   * Added missing MPI_CHK() around some statements in mpi_div_mpi() (found by
+     TrustInSoft)
+   * Fixed potential overflow in certificate size verification in
+     ssl_write_certificate() (found by TrustInSoft)
+
+Security
+   * Possible remotely-triggered out-of-bounds memory access fixed (found by
+     TrustInSoft)
+
+= PolarSSL 1.3.2 released on 2013-11-04
+Features
+   * PK tests added to test framework
+   * Added optional optimization for NIST MODP curves (POLARSSL_ECP_NIST_OPTIM)
+   * Support for Camellia-GCM mode and ciphersuites
+
+Changes
+   * Padding checks in cipher layer are now constant-time
+   * Value comparisons in SSL layer are now constant-time
+   * Support for serialNumber, postalAddress and postalCode in X509 names
+   * SSL Renegotiation was refactored
+
+Bugfix
+   * More stringent checks in cipher layer
+   * Server does not send out extensions not advertised by client
+   * Prevent possible alignment warnings on casting from char * to 'aligned *'
+   * Misc fixes and additions to dependency checks
+   * Const correctness
+   * cert_write with selfsign should use issuer_name as subject_name
+   * Fix ECDSA corner case: missing reduction mod N (found by DualTachyon)
+   * Defines to handle UEFI environment under MSVC
+   * Server-side initiated renegotiations send HelloRequest
+
+= PolarSSL 1.3.1 released on 2013-10-15
+Features
+   * Support for Brainpool curves and TLS ciphersuites (RFC 7027)
+   * Support for ECDHE-PSK key-exchange and ciphersuites
+   * Support for RSA-PSK key-exchange and ciphersuites
+
+Changes
+   * RSA blinding locks for a smaller amount of time
+   * TLS compression only allocates working buffer once
+   * Introduced POLARSSL_HAVE_READDIR_R for systems without it
+   * config.h is more script-friendly
+
+Bugfix
+   * Missing MSVC defines added
+   * Compile errors with POLARSSL_RSA_NO_CRT
+   * Header files with 'polarssl/'
+   * Const correctness
+   * Possible naming collision in dhm_context
+   * Better support for MSVC
+   * threading_set_alt() name
+   * Added missing x509write_crt_set_version()
+
+= PolarSSL 1.3.0 released on 2013-10-01
+Features
+   * Elliptic Curve Cryptography module added
+   * Elliptic Curve Diffie Hellman module added
+   * Ephemeral Elliptic Curve Diffie Hellman support for SSL/TLS
+    (ECDHE-based ciphersuites)
+   * Ephemeral Elliptic Curve Digital Signature Algorithm support for SSL/TLS
+    (ECDSA-based ciphersuites)
+   * Ability to specify allowed ciphersuites based on the protocol version.
+   * PSK and DHE-PSK based ciphersuites added
+   * Memory allocation abstraction layer added
+   * Buffer-based memory allocator added (no malloc() / free() / HEAP usage)
+   * Threading abstraction layer added (dummy / pthread / alternate)
+   * Public Key abstraction layer added
+   * Parsing Elliptic Curve keys
+   * Parsing Elliptic Curve certificates
+   * Support for max_fragment_length extension (RFC 6066)
+   * Support for truncated_hmac extension (RFC 6066)
+   * Support for zeros-and-length (ANSI X.923) padding, one-and-zeros
+     (ISO/IEC 7816-4) padding and zero padding in the cipher layer
+   * Support for session tickets (RFC 5077)
+   * Certificate Request (CSR) generation with extensions (key_usage,
+     ns_cert_type)
+   * X509 Certificate writing with extensions (basic_constraints,
+     issuer_key_identifier, etc)
+   * Optional blinding for RSA, DHM and EC
+   * Support for multiple active certificate / key pairs in SSL servers for
+     the same host (Not to be confused with SNI!)
+
+Changes
+   * Ability to enable / disable SSL v3 / TLS 1.0 / TLS 1.1 / TLS 1.2
+     individually
+   * Introduced separate SSL Ciphersuites module that is based on
+     Cipher and MD information
+   * Internals for SSL module adapted to have separate IV pointer that is
+     dynamically set (Better support for hardware acceleration)
+   * Moved all OID functionality to a separate module. RSA function
+     prototypes for the RSA sign and verify functions changed as a result
+   * Split up the GCM module into a starts/update/finish cycle
+   * Client and server now filter sent and accepted ciphersuites on minimum
+     and maximum protocol version
+   * Ability to disable server_name extension (RFC 6066)
+   * Renamed error_strerror() to the less conflicting polarssl_strerror()
+     (Ability to keep old as well with POLARSSL_ERROR_STRERROR_BC)
+   * SHA2 renamed to SHA256, SHA4 renamed to SHA512 and functions accordingly
+   * All RSA operations require a random generator for blinding purposes
+   * X509 core refactored
+   * x509_crt_verify() now case insensitive for cn (RFC 6125 6.4)
+   * Also compiles / runs without time-based functions (!POLARSSL_HAVE_TIME)
+   * Support faulty X509 v1 certificates with extensions
+     (POLARSSL_X509_ALLOW_EXTENSIONS_NON_V3)
+
+Bugfix
+   * Fixed parse error in ssl_parse_certificate_request()
+   * zlib compression/decompression skipped on empty blocks
+   * Support for AIX header locations in net.c module
+   * Fixed file descriptor leaks
+
+Security
+   * RSA blinding on CRT operations to counter timing attacks
+     (found by Cyril Arnaud and Pierre-Alain Fouque)
+
+
+= Version 1.2.14 released 2015-05-??
+
+Security
+   * Fix potential invalid memory read in the server, that allows a client to
+     crash it remotely (found by Caj Larsson).
+   * Fix potential invalid memory read in certificate parsing, that allows a
+     client to crash the server remotely if client authentication is enabled
+     (found using Codenomicon Defensics).
+   * Add countermeasure against "Lucky 13 strikes back" cache-based attack,
+     https://dl.acm.org/citation.cfm?id=2714625
+
+Bugfix
+   * Fix bug in Via Padlock support (found by Nikos Mavrogiannopoulos).
+   * Fix hardclock() (only used in the benchmarking program) with some
+     versions of mingw64 (found by kxjhlele).
+   * Fix warnings from mingw64 in timing.c (found by kxjklele).
+   * Fix potential unintended sign extension in asn1_get_len() on 64-bit
+     platforms (found with Coverity Scan).
+
+= Version 1.2.13 released 2015-02-16
+Note: Although PolarSSL has been renamed to mbed TLS, no changes reflecting
+      this will be made in the 1.2 branch at this point.
+
+Security
+   * Fix remotely-triggerable uninitialised pointer dereference caused by
+     crafted X.509 certificate (TLS server is not affected if it doesn't ask
+     for a client certificate) (found using Codenomicon Defensics).
+   * Fix remotely-triggerable memory leak caused by crafted X.509 certificates
+     (TLS server is not affected if it doesn't ask for a client certificate)
+     (found using Codenomicon Defensics).
+   * Fix potential stack overflow while parsing crafted X.509 certificates
+     (TLS server is not affected if it doesn't ask for a client certificate)
+     found using Codenomicon Defensics).
+   * Fix buffer overread of size 1 when parsing crafted X.509 certificates
+     (TLS server is not affected if it doesn't ask for a client certificate).
+
+Bugfix
+   * Fix potential undefined behaviour in Camellia.
+   * Fix memory leaks in PKCS#5 and PKCS#12.
+   * Stack buffer overflow if ctr_drbg_update() is called with too large
+     add_len (found by Jean-Philippe Aumasson) (not triggerable remotely).
+   * Fix bug in MPI/bignum on s390/s390x (reported by Dan Horák) (introduced
+     in 1.2.12).
+   * Fix unchecked return code in x509_crt_parse_path() on Windows (found by
+     Peter Vaskovic).
+   * Fix assembly selection for MIPS64 (thanks to James Cowgill).
+   * ssl_get_verify_result() now works even if the handshake was aborted due
+     to a failed verification (found by Fredrik Axelsson).
+   * Skip writing and parsing signature_algorithm extension if none of the
+     key exchanges enabled needs certificates. This fixes a possible interop
+     issue with some servers when a zero-length extension was sent. (Reported
+     by Peter Dettman.)
+   * On a 0-length input, base64_encode() did not correctly set output length
+     (found by Hendrik van den Boogaard).
+
+Changes
+   * Blind RSA private operations even when POLARSSL_RSA_NO_CRT is defined.
+   * Forbid repeated extensions in X.509 certificates.
+   * Add compile-time option POLARSSL_X509_MAX_INTERMEDIATE_CA to limit the
+     length of an X.509 verification chain (default = 8).
+= Version 1.2.12 released 2014-10-24
+
+Security
+   * Remotely-triggerable memory leak when parsing some X.509 certificates
+     (server is not affected if it doesn't ask for a client certificate).
+     (Found using Codenomicon Defensics.)
+
+Bugfix
+   * Fix potential bad read in parsing ServerHello (found by Adrien
+     Vialletelle).
+   * ssl_close_notify() could send more than one message in some circumstances
+     with non-blocking I/O.
+   * x509_crt_parse() did not increase total_failed on PEM error
+   * Fix compiler warnings on iOS (found by Sander Niemeijer).
+   * Don't print uninitialised buffer in ssl_mail_client (found by Marc Abel).
+   * Fix net_accept() regarding non-blocking sockets (found by Luca Pesce).
+   * ssl_read() could return non-application data records on server while
+     renegotation was pending, and on client when a HelloRequest was received.
+   * Fix warnings from Clang's scan-build (contributed by Alfred Klomp).
+
+Changes
+   * X.509 certificates with more than one AttributeTypeAndValue per
+     RelativeDistinguishedName are not accepted any more.
+   * ssl_read() now returns POLARSSL_ERR_NET_WANT_READ rather than
+     POLARSSL_ERR_SSL_UNEXPECTED_MESSAGE on harmless alerts.
+   * Accept spaces at end of line or end of buffer in base64_decode().
+
+= Version 1.2.11 released 2014-07-11
+Features
+   * Entropy module now supports seed writing and reading
+
+Changes
+   * Introduced POLARSSL_HAVE_READDIR_R for systems without it
+   * Improvements to the CMake build system, contributed by Julian Ospald.
+   * Work around a bug of the version of Clang shipped by Apple with Mavericks
+     that prevented bignum.c from compiling. (Reported by Rafael Baptista.)
+   * Improvements to tests/Makefile, contributed by Oden Eriksson.
+   * Use UTC time to check certificate validity.
+   * Reject certificates with times not in UTC, per RFC 5280.
+   * Migrate zeroizing of data to polarssl_zeroize() instead of memset()
+     against unwanted compiler optimizations
+
+Security
+   * Forbid change of server certificate during renegotiation to prevent
+     "triple handshake" attack when authentication mode is optional (the
+     attack was already impossible when authentication is required).
+   * Check notBefore timestamp of certificates and CRLs from the future.
+   * Forbid sequence number wrapping
+   * Prevent potential NULL pointer dereference in ssl_read_record() (found by
+     TrustInSoft)
+   * Fix length checking for AEAD ciphersuites (found by Codenomicon).
+     It was possible to crash the server (and client) using crafted messages
+     when a GCM suite was chosen.
+
+Bugfix
+   * Fixed X.509 hostname comparison (with non-regular characters)
+   * SSL now gracefully handles missing RNG
+   * crypt_and_hash app checks MAC before final decryption
+   * Fixed x509_crt_parse_path() bug on Windows platforms
+   * Added missing MPI_CHK() around some statements in mpi_div_mpi() (found by
+     TrustInSoft)
+   * Fixed potential overflow in certificate size verification in
+     ssl_write_certificate() (found by TrustInSoft)
+   * Fix ASM format in bn_mul.h
+   * Potential memory leak in bignum_selftest()
+   * Replaced expired test certificate
+   * ssl_mail_client now terminates lines with CRLF, instead of LF
+   * Fix bug in RSA PKCS#1 v1.5 "reversed" operations
+   * Fixed testing with out-of-source builds using cmake
+   * Fixed version-major intolerance in server
+   * Fixed CMake symlinking on out-of-source builds
+   * Bignum's MIPS-32 assembly was used on MIPS-64, causing chaos. (Found by
+     Alex Wilson.)
+   * ssl_init() was leaving a dirty pointer in ssl_context if malloc of
+     out_ctr failed
+   * ssl_handshake_init() was leaving dirty pointers in subcontexts if malloc
+     of one of them failed
+   * x509_get_current_time() uses localtime_r() to prevent thread issues
+   * Some example server programs were not sending the close_notify alert.
+   * Potential memory leak in mpi_exp_mod() when error occurs during
+     calculation of RR.
+   * Improve interoperability by not writing extension length in ClientHello
+     when no extensions are present (found by Matthew Page)
+   * rsa_check_pubkey() now allows an E up to N
+   * On OpenBSD, use arc4random_buf() instead of rand() to prevent warnings
+   * mpi_fill_random() was creating numbers larger than requested on
+     big-endian platform when size was not an integer number of limbs
+   * Fix detection of DragonflyBSD in net.c (found by Markus Pfeiffer)
+   * Stricter check on SSL ClientHello internal sizes compared to actual packet
+     size (found by TrustInSoft)
+   * Fix preprocessor checks for bn_mul PPC asm (found by Barry K. Nathan).
+   * Use \n\t rather than semicolons for bn_mul asm, since some assemblers
+     interpret semicolons as comment delimiters (found by Barry K. Nathan).
+   * Disable broken Sparc64 bn_mul assembly (found by Florian Obser).
+   * Fix base64_decode() to return and check length correctly (in case of
+     tight buffers)
+
+= Version 1.2.10 released 2013-10-07
+Changes
+   * Changed RSA blinding to a slower but thread-safe version
+
+Bugfix
+   * Fixed memory leak in RSA as a result of introduction of blinding
+   * Fixed ssl_pkcs11_decrypt() prototype
+   * Fixed MSVC project files
+
+= Version 1.2.9 released 2013-10-01
+Changes
+   * x509_verify() now case insensitive for cn (RFC 6125 6.4)
+
+Bugfix
+   * Fixed potential memory leak when failing to resume a session
+   * Fixed potential file descriptor leaks (found by Remi Gacogne)
+   * Minor fixes
+
+Security
+   * Fixed potential heap buffer overflow on large hostname setting
+   * Fixed potential negative value misinterpretation in load_file()
+   * RSA blinding on CRT operations to counter timing attacks
+     (found by Cyril Arnaud and Pierre-Alain Fouque)
+
+= Version 1.2.8 released 2013-06-19
+Features
+   * Parsing of PKCS#8 encrypted private key files
+   * PKCS#12 PBE and derivation functions
+   * Centralized module option values in config.h to allow user-defined
+     settings without editing header files by using POLARSSL_CONFIG_OPTIONS
+
+Changes
+   * HAVEGE random generator disabled by default
+   * Internally split up x509parse_key() into a (PEM) handler function
+     and specific DER parser functions for the PKCS#1 and unencrypted
+     PKCS#8 private key formats
+   * Added mechanism to provide alternative implementations for all
+     symmetric cipher and hash algorithms (e.g. POLARSSL_AES_ALT in
+     config.h)
+   * PKCS#5 module added. Moved PBKDF2 functionality inside and deprecated
+     old PBKDF2 module
+
+Bugfix
+   * Secure renegotiation extension should only be sent in case client
+     supports secure renegotiation
+   * Fixed offset for cert_type list in ssl_parse_certificate_request()
+   * Fixed const correctness issues that have no impact on the ABI
+   * x509parse_crt() now better handles PEM error situations
+   * ssl_parse_certificate() now calls x509parse_crt_der() directly
+     instead of the x509parse_crt() wrapper that can also parse PEM
+     certificates
+   * x509parse_crtpath() is now reentrant and uses more portable stat()
+   * Fixed bignum.c and bn_mul.h to support Thumb2 and LLVM compiler
+   * Fixed values for 2-key Triple DES in cipher layer
+   * ssl_write_certificate_request() can handle empty ca_chain
+
+Security
+   * A possible DoS during the SSL Handshake, due to faulty parsing of
+     PEM-encoded certificates has been fixed (found by Jack Lloyd)
+
+= Version 1.2.7 released 2013-04-13
+Features
+   * Ability to specify allowed ciphersuites based on the protocol version.
+
+Changes
+   * Default Blowfish keysize is now 128-bits
+   * Test suites made smaller to accommodate Raspberry Pi
+
+Bugfix
+   * Fix for MPI assembly for ARM
+   * GCM adapted to support sizes > 2^29
+
+= Version 1.2.6 released 2013-03-11
+Bugfix
+   * Fixed memory leak in ssl_free() and ssl_reset() for active session
+   * Corrected GCM counter incrementation to use only 32-bits instead of
+     128-bits (found by Yawning Angel)
+   * Fixes for 64-bit compilation with MS Visual Studio
+   * Fixed net_bind() for specified IP addresses on little endian systems
+   * Fixed assembly code for ARM (Thumb and regular) for some compilers
+
+Changes
+   * Internally split up rsa_pkcs1_encrypt(), rsa_pkcs1_decrypt(),
+     rsa_pkcs1_sign() and rsa_pkcs1_verify() to separate PKCS#1 v1.5 and
+     PKCS#1 v2.1 functions
+   * Added support for custom labels when using rsa_rsaes_oaep_encrypt()
+     or rsa_rsaes_oaep_decrypt()
+   * Re-added handling for SSLv2 Client Hello when the define
+     POLARSSL_SSL_SRV_SUPPORT_SSLV2_CLIENT_HELLO is set
+   * The SSL session cache module (ssl_cache) now also retains peer_cert
+     information (not the entire chain)
+
+Security
+   * Removed further timing differences during SSL message decryption in
+     ssl_decrypt_buf()
+   * Removed timing differences due to bad padding from
+     rsa_rsaes_pkcs1_v15_decrypt() and rsa_pkcs1_decrypt() for PKCS#1 v1.5
+     operations
+
+= Version 1.2.5 released 2013-02-02
+Changes
+   * Allow enabling of dummy error_strerror() to support some use-cases
+   * Debug messages about padding errors during SSL message decryption are
+     disabled by default and can be enabled with POLARSSL_SSL_DEBUG_ALL
+   * Sending of security-relevant alert messages that do not break
+     interoperability can be switched on/off with the flag
+     POLARSSL_SSL_ALL_ALERT_MESSAGES
+
+Security
+   * Removed timing differences during SSL message decryption in
+     ssl_decrypt_buf() due to badly formatted padding
+
+= Version 1.2.4 released 2013-01-25
+Changes
+   * More advanced SSL ciphersuite representation and moved to more dynamic
+     SSL core
+   * Added ssl_handshake_step() to allow single stepping the handshake process
+
+Bugfix
+   * Memory leak when using RSA_PKCS_V21 operations fixed
+   * Handle future version properly in ssl_write_certificate_request()
+   * Correctly handle CertificateRequest message in client for <= TLS 1.1
+     without DN list
+
+= Version 1.2.3 released 2012-11-26
+Bugfix
+   * Server not always sending correct CertificateRequest message
+
+= Version 1.2.2 released 2012-11-24
+Changes
+   * Added p_hw_data to ssl_context for context specific hardware acceleration
+     data
+   * During verify trust-CA is only checked for expiration and CRL presence
+
+Bugfixes
+   * Fixed client authentication compatibility
+   * Fixed dependency on POLARSSL_SHA4_C in SSL modules
+
+= Version 1.2.1 released 2012-11-20
+Changes
+   * Depth that the certificate verify callback receives is now numbered
+     bottom-up (Peer cert depth is 0)
+
+Bugfixes
+   * Fixes for MSVC6
+   * Moved mpi_inv_mod() outside POLARSSL_GENPRIME
+   * Allow R and A to point to same mpi in mpi_div_mpi (found by Manuel
+     Pégourié-Gonnard)
+   * Fixed possible segfault in mpi_shift_r() (found by Manuel
+     Pégourié-Gonnard)
+   * Added max length check for rsa_pkcs1_sign with PKCS#1 v2.1
+
+= Version 1.2.0 released 2012-10-31
+Features
+   * Added support for NULL cipher (POLARSSL_CIPHER_NULL_CIPHER) and weak
+     ciphersuites (POLARSSL_ENABLE_WEAK_CIPHERSUITES). They are disabled by
+     default!
+   * Added support for wildcard certificates
+   * Added support for multi-domain certificates through the X509 Subject
+     Alternative Name extension
+   * Added preliminary ASN.1 buffer writing support
+   * Added preliminary X509 Certificate Request writing support
+   * Added key_app_writer example application
+   * Added cert_req example application
+   * Added base Galois Counter Mode (GCM) for AES
+   * Added TLS 1.2 support (RFC 5246)
+   * Added GCM suites to TLS 1.2 (RFC 5288)
+   * Added commandline error code convertor (util/strerror)
+   * Added support for Hardware Acceleration hooking in SSL/TLS
+   * Added OpenSSL / PolarSSL compatibility script (tests/compat.sh) and
+     example application (programs/ssl/o_p_test) (requires OpenSSL)
+   * Added X509 CA Path support
+   * Added Thumb assembly optimizations
+   * Added DEFLATE compression support as per RFC3749 (requires zlib)
+   * Added blowfish algorithm (Generic and cipher layer)
+   * Added PKCS#5 PBKDF2 key derivation function
+   * Added Secure Renegotiation (RFC 5746)
+   * Added predefined DHM groups from RFC 5114
+   * Added simple SSL session cache implementation
+   * Added ServerName extension parsing (SNI) at server side
+   * Added option to add minimum accepted SSL/TLS protocol version
+
+Changes
+   * Removed redundant POLARSSL_DEBUG_MSG define
+   * AES code only check for Padlock once
+   * Fixed const-correctness mpi_get_bit()
+   * Documentation for mpi_lsb() and mpi_msb()
+   * Moved out_msg to out_hdr + 32 to support hardware acceleration
+   * Changed certificate verify behaviour to comply with RFC 6125 section 6.3
+     to not match CN if subjectAltName extension is present (Closes ticket #56)
+   * Cipher layer cipher_mode_t POLARSSL_MODE_CFB128 is renamed to
+     POLARSSL_MODE_CFB, to also handle different block size CFB modes.
+   * Removed handling for SSLv2 Client Hello (as per RFC 5246 recommendation)
+   * Revamped session resumption handling
+   * Generalized external private key implementation handling (like PKCS#11)
+     in SSL/TLS
+   * Revamped x509_verify() and the SSL f_vrfy callback implementations
+   * Moved from unsigned long to fixed width uint32_t types throughout code
+   * Renamed ciphersuites naming scheme to IANA reserved names
+
+Bugfix
+   * Fixed handling error in mpi_cmp_mpi() on longer B values (found by
+     Hui Dong)
+   * Fixed potential heap corruption in x509_name allocation
+   * Fixed single RSA test that failed on Big Endian systems (Closes ticket #54)
+   * mpi_exp_mod() now correctly handles negative base numbers (Closes ticket
+     #52)
+   * Handle encryption with private key and decryption with public key as per
+     RFC 2313
+   * Handle empty certificate subject names
+   * Prevent reading over buffer boundaries on X509 certificate parsing
+   * mpi_add_abs() now correctly handles adding short numbers to long numbers
+     with carry rollover (found by Ruslan Yushchenko)
+   * Handle existence of OpenSSL Trust Extensions at end of X.509 DER blob
+   * Fixed MPI assembly for SPARC64 platform
+
+Security
+   * Fixed potential memory zeroization on miscrafted RSA key (found by Eloi
+     Vanderbeken)
+
+= Version 1.1.8 released on 2013-10-01
+Bugfix
+   * Fixed potential memory leak when failing to resume a session
+   * Fixed potential file descriptor leaks
+
+Security
+   * Potential buffer-overflow for ssl_read_record() (independently found by
+     both TrustInSoft and Paul Brodeur of Leviathan Security Group)
+   * Potential negative value misinterpretation in load_file()
+   * Potential heap buffer overflow on large hostname setting
+
+= Version 1.1.7 released on 2013-06-19
+Changes
+   * HAVEGE random generator disabled by default
+
+Bugfix
+   * x509parse_crt() now better handles PEM error situations
+   * ssl_parse_certificate() now calls x509parse_crt_der() directly
+     instead of the x509parse_crt() wrapper that can also parse PEM
+     certificates
+   * Fixed values for 2-key Triple DES in cipher layer
+   * ssl_write_certificate_request() can handle empty ca_chain
+
+Security
+   * A possible DoS during the SSL Handshake, due to faulty parsing of
+     PEM-encoded certificates has been fixed (found by Jack Lloyd)
+
+= Version 1.1.6 released on 2013-03-11
+Bugfix
+   * Fixed net_bind() for specified IP addresses on little endian systems
+
+Changes
+   * Allow enabling of dummy error_strerror() to support some use-cases
+   * Debug messages about padding errors during SSL message decryption are
+     disabled by default and can be enabled with POLARSSL_SSL_DEBUG_ALL
+
+Security
+   * Removed timing differences during SSL message decryption in
+     ssl_decrypt_buf()
+   * Removed timing differences due to bad padding from
+     rsa_rsaes_pkcs1_v15_decrypt() and rsa_pkcs1_decrypt() for PKCS#1 v1.5
+     operations
+
+= Version 1.1.5 released on 2013-01-16
+Bugfix
+   * Fixed MPI assembly for SPARC64 platform
+   * Handle existence of OpenSSL Trust Extensions at end of X.509 DER blob
+   * mpi_add_abs() now correctly handles adding short numbers to long numbers
+     with carry rollover
+   * Moved mpi_inv_mod() outside POLARSSL_GENPRIME
+   * Prevent reading over buffer boundaries on X509 certificate parsing
+   * mpi_exp_mod() now correctly handles negative base numbers (Closes ticket
+     #52)
+   * Fixed possible segfault in mpi_shift_r() (found by Manuel
+     Pégourié-Gonnard)
+   * Allow R and A to point to same mpi in mpi_div_mpi (found by Manuel
+     Pégourié-Gonnard)
+   * Added max length check for rsa_pkcs1_sign with PKCS#1 v2.1
+   * Memory leak when using RSA_PKCS_V21 operations fixed
+   * Handle encryption with private key and decryption with public key as per
+     RFC 2313
+   * Fixes for MSVC6
+
+Security
+   * Fixed potential memory zeroization on miscrafted RSA key (found by Eloi
+     Vanderbeken)
+
+= Version 1.1.4 released on 2012-05-31
+Bugfix
+   * Correctly handle empty SSL/TLS packets (Found by James Yonan)
+   * Fixed potential heap corruption in x509_name allocation
+   * Fixed single RSA test that failed on Big Endian systems (Closes ticket #54)
+
+= Version 1.1.3 released on 2012-04-29
+Bugfix
+   * Fixed random MPI generation to not generate more size than requested.
+
+= Version 1.1.2 released on 2012-04-26
+Bugfix
+   * Fixed handling error in mpi_cmp_mpi() on longer B values (found by
+     Hui Dong)
+
+Security
+   * Fixed potential memory corruption on miscrafted client messages (found by
+     Frama-C team at CEA LIST)
+   * Fixed generation of DHM parameters to correct length (found by Ruslan
+     Yushchenko)
+
+= Version 1.1.1 released on 2012-01-23
+Bugfix
+   * Check for failed malloc() in ssl_set_hostname() and x509_get_entries()
+     (Closes ticket #47, found by Hugo Leisink)
+   * Fixed issues with Intel compiler on 64-bit systems (Closes ticket #50)
+   * Fixed multiple compiler warnings for VS6 and armcc
+   * Fixed bug in CTR_CRBG selftest
+
+= Version 1.1.0 released on 2011-12-22
+Features
+   * Added ssl_session_reset() to allow better multi-connection pools of
+     SSL contexts without needing to set all non-connection-specific
+     data and pointers again. Adapted ssl_server to use this functionality.
+   * Added ssl_set_max_version() to allow clients to offer a lower maximum
+     supported version to a server to help buggy server implementations.
+     (Closes ticket #36)
+   * Added cipher_get_cipher_mode() and cipher_get_cipher_operation()
+     introspection functions (Closes ticket #40)
+   * Added CTR_DRBG based on AES-256-CTR (NIST SP 800-90) random generator
+   * Added a generic entropy accumulator that provides support for adding
+     custom entropy sources and added some generic and platform dependent
+     entropy sources
+
+Changes
+   * Documentation for AES and Camellia in modes CTR and CFB128 clarified.
+   * Fixed rsa_encrypt and rsa_decrypt examples to use public key for
+     encryption and private key for decryption. (Closes ticket #34)
+   * Inceased maximum size of ASN1 length reads to 32-bits.
+   * Added an EXPLICIT tag number parameter to x509_get_ext()
+   * Added a separate CRL entry extension parsing function
+   * Separated the ASN.1 parsing code from the X.509 specific parsing code.
+     So now there is a module that is controlled with POLARSSL_ASN1_PARSE_C.
+   * Changed the defined key-length of DES ciphers in cipher.h to include the
+     parity bits, to prevent mistakes in copying data. (Closes ticket #33)
+   * Loads of minimal changes to better support WINCE as a build target
+     (Credits go to Marco Lizza)
+   * Added POLARSSL_MPI_WINDOW_SIZE definition to allow easier time to memory
+     trade-off
+   * Introduced POLARSSL_MPI_MAX_SIZE and POLARSSL_MPI_MAX_BITS for MPI size
+     management (Closes ticket #44)
+   * Changed the used random function pointer to more flexible format. Renamed
+     havege_rand() to havege_random() to prevent mistakes. Lots of changes as
+     a consequence in library code and programs
+   * Moved all examples programs to use the new entropy and CTR_DRBG
+   * Added permissive certificate parsing to x509parse_crt() and
+     x509parse_crtfile(). With permissive parsing the parsing does not stop on
+     encountering a parse-error. Beware that the meaning of return values has
+     changed!
+   * All error codes are now negative. Even on mermory failures and IO errors.
+
+Bugfix
+   * Fixed faulty HMAC-MD2 implementation. Found by dibac. (Closes
+     ticket #37)
+   * Fixed a bug where the CRL parser expected an EXPLICIT ASN.1 tag
+     before version numbers
+   * Allowed X509 key usage parsing to accept 4 byte values instead of the
+     standard 1 byte version sometimes used by Microsoft. (Closes ticket #38)
+   * Fixed incorrect behaviour in case of RSASSA-PSS with a salt length
+     smaller than the hash length. (Closes ticket #41)
+   * If certificate serial is longer than 32 octets, serial number is now
+     appended with '....' after first 28 octets
+   * Improved build support for s390x and sparc64 in bignum.h
+   * Fixed MS Visual C++ name clash with int64 in sha4.h
+   * Corrected removal of leading "00:" in printing serial numbers in
+     certificates and CRLs
+
+= Version 1.0.0 released on 2011-07-27
+Features
+   * Expanded cipher layer with support for CFB128 and CTR mode
+   * Added rsa_encrypt and rsa_decrypt simple example programs.
+
+Changes
+   * The generic cipher and message digest layer now have normal error
+     codes instead of integers
+
+Bugfix
+   * Undid faulty bug fix in ssl_write() when flushing old data (Ticket
+     #18)
+
+= Version 0.99-pre5 released on 2011-05-26
+Features
+   * Added additional Cipher Block Modes to symmetric ciphers
+     (AES CTR, Camellia CTR, XTEA CBC) including the option to
+     enable and disable individual modes when needed
+   * Functions requiring File System functions can now be disabled
+     by undefining POLARSSL_FS_IO
+   * A error_strerror function() has been added to translate between
+     error codes and their description.
+   * Added mpi_get_bit() and mpi_set_bit() individual bit setter/getter
+     functions.
+   * Added ssl_mail_client and ssl_fork_server as example programs.
+
+Changes
+   * Major argument / variable rewrite. Introduced use of size_t
+     instead of int for buffer lengths and loop variables for
+     better unsigned / signed use. Renamed internal bigint types
+     t_int and t_dbl to t_uint and t_udbl in the process
+   * mpi_init() and mpi_free() now only accept a single MPI
+     argument and do not accept variable argument lists anymore.
+   * The error codes have been remapped and combining error codes
+     is now done with a PLUS instead of an OR as error codes
+     used are negative.
+   * Changed behaviour of net_read(), ssl_fetch_input() and ssl_recv().
+     net_recv() now returns 0 on EOF instead of
+     POLARSSL_ERR_NET_CONN_RESET. ssl_fetch_input() returns
+     POLARSSL_ERR_SSL_CONN_EOF on an EOF from its f_recv() function.
+     ssl_read() returns 0 if a POLARSSL_ERR_SSL_CONN_EOF is received
+     after the handshake.
+   * Network functions now return POLARSSL_ERR_NET_WANT_READ or
+     POLARSSL_ERR_NET_WANT_WRITE instead of the ambiguous
+     POLARSSL_ERR_NET_TRY_AGAIN
+
+= Version 0.99-pre4 released on 2011-04-01
+Features
+   * Added support for PKCS#1 v2.1 encoding and thus support
+     for the RSAES-OAEP and RSASSA-PSS operations.
+   * Reading of Public Key files incorporated into default x509
+     functionality as well.
+   * Added mpi_fill_random() for centralized filling of big numbers
+     with random data (Fixed ticket #10)
+
+Changes
+   * Debug print of MPI now removes leading zero octets and
+     displays actual bit size of the value.
+   * x509parse_key() (and as a consequence x509parse_keyfile())
+     does not zeroize memory in advance anymore. Use rsa_init()
+     before parsing a key or keyfile!
+
+Bugfix
+   * Debug output of MPI's now the same independent of underlying
+     platform (32-bit / 64-bit) (Fixes ticket #19, found by Mads
+     Kiilerich and Mihai Militaru)
+   * Fixed bug in ssl_write() when flushing old data (Fixed ticket
+     #18, found by Nikolay Epifanov)
+   * Fixed proper handling of RSASSA-PSS verification with variable
+     length salt lengths
+
+= Version 0.99-pre3 released on 2011-02-28
+This release replaces version 0.99-pre2 which had possible copyright issues.
+Features
+   * Parsing PEM private keys encrypted with DES and AES
+     are now supported as well (Fixes ticket #5)
+   * Added crl_app program to allow easy reading and
+     printing of X509 CRLs from file
+
+Changes
+   * Parsing of PEM files moved to separate module (Fixes
+     ticket #13). Also possible to remove PEM support for
+     systems only using DER encoding
+
+Bugfixes
+   * Corrected parsing of UTCTime dates before 1990 and
+     after 1950
+   * Support more exotic OID's when parsing certificates
+     (found by Mads Kiilerich)
+   * Support more exotic name representations when parsing
+     certificates (found by Mads Kiilerich)
+   * Replaced the expired test certificates
+   * Do not bail out if no client certificate specified. Try
+     to negotiate anonymous connection (Fixes ticket #12,
+     found by Boris Krasnovskiy)
+
+Security fixes
+   * Fixed a possible Man-in-the-Middle attack on the
+     Diffie Hellman key exchange (thanks to Larry Highsmith,
+     Subreption LLC)
+
+= Version 0.99-pre1 released on 2011-01-30
+Features
+Note: Most of these features have been donated by Fox-IT
+   * Added Doxygen source code documentation parts
+   * Added reading of DHM context from memory and file
+   * Improved X509 certificate parsing to include extended
+     certificate fields, including Key Usage
+   * Improved certificate verification and verification
+     against the available CRLs
+   * Detection for DES weak keys and parity bits added
+   * Improvements to support integration in other
+     applications:
+       + Added generic message digest and cipher wrapper
+       + Improved information about current capabilities,
+         status, objects and configuration
+       + Added verification callback on certificate chain
+         verification to allow external blacklisting
+       + Additional example programs to show usage
+   * Added support for PKCS#11 through the use of the
+     libpkcs11-helper library
+
+Changes
+   * x509parse_time_expired() checks time in addition to
+     the existing date check
+   * The ciphers member of ssl_context and the cipher member
+     of ssl_session have been renamed to ciphersuites and
+     ciphersuite respectively. This clarifies the difference
+     with the generic cipher layer and is better naming
+     altogether
+
+= Version 0.14.0 released on 2010-08-16
+Features
+   * Added support for SSL_EDH_RSA_AES_128_SHA and
+     SSL_EDH_RSA_CAMELLIA_128_SHA ciphersuites
+   * Added compile-time and run-time version information
+   * Expanded ssl_client2 arguments for more flexibility
+   * Added support for TLS v1.1
+
+Changes
+   * Made Makefile cleaner
+   * Removed dependency on rand() in rsa_pkcs1_encrypt().
+     Now using random fuction provided to function and
+     changed the prototype of rsa_pkcs1_encrypt(),
+     rsa_init() and rsa_gen_key().
+   * Some SSL defines were renamed in order to avoid
+     future confusion
+
+Bug fixes
+   * Fixed CMake out of source build for tests (found by
+     kkert)
+   * rsa_check_private() now supports PKCS1v2 keys as well
+   * Fixed deadlock in rsa_pkcs1_encrypt() on failing random
+     generator
+
+= Version 0.13.1 released on 2010-03-24
+Bug fixes
+   * Fixed Makefile in library that was mistakenly merged
+   * Added missing const string fixes
+
+= Version 0.13.0 released on 2010-03-21
+Features
+   * Added option parsing for host and port selection to
+     ssl_client2
+   * Added support for GeneralizedTime in X509 parsing
+   * Added cert_app program to allow easy reading and
+     printing of X509 certificates from file or SSL
+     connection.
+
+Changes
+   * Added const correctness for main code base
+   * X509 signature algorithm determination is now
+     in a function to allow easy future expansion
+   * Changed symmetric cipher functions to
+     identical interface (returning int result values)
+   * Changed ARC4 to use separate input/output buffer
+   * Added reset function for HMAC context as speed-up
+     for specific use-cases
+
+Bug fixes
+   * Fixed bug resulting in failure to send the last
+     certificate in the chain in ssl_write_certificate() and
+     ssl_write_certificate_request() (found by fatbob)
+   * Added small fixes for compiler warnings on a Mac
+     (found by Frank de Brabander)
+   * Fixed algorithmic bug in mpi_is_prime() (found by
+     Smbat Tonoyan)
+
+= Version 0.12.1 released on 2009-10-04
+Changes
+   * Coverage test definitions now support 'depends_on'
+     tagging system.
+   * Tests requiring specific hashing algorithms now honor
+     the defines.
+
+Bug fixes
+   * Changed typo in #ifdef in x509parse.c (found
+     by Eduardo)
+
+= Version 0.12.0 released on 2009-07-28
+Features
+   * Added CMake makefiles as alternative to regular Makefiles.
+   * Added preliminary Code Coverage tests for AES, ARC4,
+     Base64, MPI, SHA-family, MD-family, HMAC-SHA-family,
+     Camellia, DES, 3-DES, RSA PKCS#1, XTEA, Diffie-Hellman
+     and X509parse.
+
+Changes
+   * Error codes are not (necessarily) negative. Keep
+     this is mind when checking for errors.
+   * RSA_RAW renamed to SIG_RSA_RAW for consistency.
+   * Fixed typo in name of POLARSSL_ERR_RSA_OUTPUT_TOO_LARGE.
+   * Changed interface for AES and Camellia setkey functions
+     to indicate invalid key lengths.
+
+Bug fixes
+   * Fixed include location of endian.h on FreeBSD (found by
+     Gabriel)
+   * Fixed include location of endian.h and name clash on
+     Apples (found by Martin van Hensbergen)
+   * Fixed HMAC-MD2 by modifying md2_starts(), so that the
+     required HMAC ipad and opad variables are not cleared.
+     (found by code coverage tests)
+   * Prevented use of long long in bignum if
+     POLARSSL_HAVE_LONGLONG not defined (found by Giles
+     Bathgate).
+   * Fixed incorrect handling of negative strings in
+     mpi_read_string() (found by code coverage tests).
+   * Fixed segfault on handling empty rsa_context in
+     rsa_check_pubkey() and rsa_check_privkey() (found by
+     code coverage tests).
+   * Fixed incorrect handling of one single negative input
+     value in mpi_add_abs() (found by code coverage tests).
+   * Fixed incorrect handling of negative first input
+     value in mpi_sub_abs() (found by code coverage tests).
+   * Fixed incorrect handling of negative first input
+     value in mpi_mod_mpi() and mpi_mod_int(). Resulting
+     change also affects mpi_write_string() (found by code
+     coverage tests).
+   * Corrected is_prime() results for 0, 1 and 2 (found by
+     code coverage tests).
+   * Fixed Camellia and XTEA for 64-bit Windows systems.
+
+= Version 0.11.1 released on 2009-05-17
+   * Fixed missing functionality for SHA-224, SHA-256, SHA384,
+     SHA-512 in rsa_pkcs1_sign()
+
+= Version 0.11.0 released on 2009-05-03
+   * Fixed a bug in mpi_gcd() so that it also works when both
+     input numbers are even and added testcases to check
+     (found by Pierre Habouzit).
+   * Added support for SHA-224, SHA-256, SHA-384 and SHA-512
+     one way hash functions with the PKCS#1 v1.5 signing and
+     verification.
+   * Fixed minor bug regarding mpi_gcd located within the
+     POLARSSL_GENPRIME block.
+   * Fixed minor memory leak in x509parse_crt() and added better
+     handling of 'full' certificate chains (found by Mathias
+     Olsson).
+   * Centralized file opening and reading for x509 files into
+     load_file()
+   * Made definition of net_htons() endian-clean for big endian
+     systems (Found by Gernot).
+   * Undefining POLARSSL_HAVE_ASM now also handles prevents asm in
+     padlock and timing code.
+   * Fixed an off-by-one buffer allocation in ssl_set_hostname()
+     responsible for crashes and unwanted behaviour.
+   * Added support for Certificate Revocation List (CRL) parsing.
+   * Added support for CRL revocation to x509parse_verify() and
+     SSL/TLS code.
+   * Fixed compatibility of XTEA and Camellia on a 64-bit system
+     (found by Felix von Leitner).
+
+= Version 0.10.0 released on 2009-01-12
+   * Migrated XySSL to PolarSSL
+   * Added XTEA symmetric cipher
+   * Added Camellia symmetric cipher
+   * Added support for ciphersuites: SSL_RSA_CAMELLIA_128_SHA,
+     SSL_RSA_CAMELLIA_256_SHA and SSL_EDH_RSA_CAMELLIA_256_SHA
+   * Fixed dangerous bug that can cause a heap overflow in
+     rsa_pkcs1_decrypt (found by Christophe Devine)
+
+================================================================
+XySSL ChangeLog
+
+= Version 0.9 released on 2008-03-16
+
+    * Added support for ciphersuite: SSL_RSA_AES_128_SHA
+    * Enabled support for large files by default in aescrypt2.c
+    * Preliminary openssl wrapper contributed by David Barrett
+    * Fixed a bug in ssl_write() that caused the same payload to
+      be sent twice in non-blocking mode when send returns EAGAIN
+    * Fixed ssl_parse_client_hello(): session id and challenge must
+      not be swapped in the SSLv2 ClientHello (found by Greg Robson)
+    * Added user-defined callback debug function (Krystian Kolodziej)
+    * Before freeing a certificate, properly zero out all cert. data
+    * Fixed the "mode" parameter so that encryption/decryption are
+      not swapped on PadLock; also fixed compilation on older versions
+      of gcc (bug reported by David Barrett)
+    * Correctly handle the case in padlock_xcryptcbc() when input or
+      output data is non-aligned by falling back to the software
+      implementation, as VIA Nehemiah cannot handle non-aligned buffers
+    * Fixed a memory leak in x509parse_crt() which was reported by Greg
+      Robson-Garth; some x509write.c fixes by Pascal Vizeli, thanks to
+      Matthew Page who reported several bugs
+    * Fixed x509_get_ext() to accept some rare certificates which have
+      an INTEGER instead of a BOOLEAN for BasicConstraints::cA.
+    * Added support on the client side for the TLS "hostname" extension
+      (patch contributed by David Patino)
+    * Make x509parse_verify() return BADCERT_CN_MISMATCH when an empty
+      string is passed as the CN (bug reported by spoofy)
+    * Added an option to enable/disable the BN assembly code
+    * Updated rsa_check_privkey() to verify that (D*E) = 1 % (P-1)*(Q-1)
+    * Disabled obsolete hash functions by default (MD2, MD4); updated
+      selftest and benchmark to not test ciphers that have been disabled
+    * Updated x509parse_cert_info() to correctly display byte 0 of the
+      serial number, setup correct server port in the ssl client example
+    * Fixed a critical denial-of-service with X.509 cert. verification:
+      peer may cause xyssl to loop indefinitely by sending a certificate
+      for which the RSA signature check fails (bug reported by Benoit)
+    * Added test vectors for: AES-CBC, AES-CFB, DES-CBC and 3DES-CBC,
+      HMAC-MD5, HMAC-SHA1, HMAC-SHA-256, HMAC-SHA-384, and HMAC-SHA-512
+    * Fixed HMAC-SHA-384 and HMAC-SHA-512 (thanks to Josh Sinykin)
+    * Modified ssl_parse_client_key_exchange() to protect against
+      Daniel Bleichenbacher attack on PKCS#1 v1.5 padding, as well
+      as the Klima-Pokorny-Rosa extension of Bleichenbacher's attack
+    * Updated rsa_gen_key() so that ctx->N is always nbits in size
+    * Fixed assembly PPC compilation errors on Mac OS X, thanks to
+      David Barrett and Dusan Semen
+
+= Version 0.8 released on 2007-10-20
+
+    * Modified the HMAC functions to handle keys larger
+      than 64 bytes, thanks to Stephane Desneux and gary ng
+    * Fixed ssl_read_record() to properly update the handshake
+      message digests, which fixes IE6/IE7 client authentication
+    * Cleaned up the XYSSL* #defines, suggested by Azriel Fasten
+    * Fixed net_recv(), thanks to Lorenz Schori and Egon Kocjan
+    * Added user-defined callbacks for handling I/O and sessions
+    * Added lots of debugging output in the SSL/TLS functions
+    * Added preliminary X.509 cert. writing by Pascal Vizeli
+    * Added preliminary support for the VIA PadLock routines
+    * Added AES-CFB mode of operation, contributed by chmike
+    * Added an SSL/TLS stress testing program (ssl_test.c)
+    * Updated the RSA PKCS#1 code to allow choosing between
+      RSA_PUBLIC and RSA_PRIVATE, as suggested by David Barrett
+    * Updated ssl_read() to skip 0-length records from OpenSSL
+    * Fixed the make install target to comply with *BSD make
+    * Fixed a bug in mpi_read_binary() on 64-bit platforms
+    * mpi_is_prime() speedups, thanks to Kevin McLaughlin
+    * Fixed a long standing memory leak in mpi_is_prime()
+    * Replaced realloc with malloc in mpi_grow(), and set
+      the sign of zero as positive in mpi_init() (reported
+      by Jonathan M. McCune)
+
+= Version 0.7 released on 2007-07-07
+
+    * Added support for the MicroBlaze soft-core processor
+    * Fixed a bug in ssl_tls.c which sometimes prevented SSL
+      connections from being established with non-blocking I/O
+    * Fixed a couple bugs in the VS6 and UNIX Makefiles
+    * Fixed the "PIC register ebx clobbered in asm" bug
+    * Added HMAC starts/update/finish support functions
+    * Added the SHA-224, SHA-384 and SHA-512 hash functions
+    * Fixed the net_set_*block routines, thanks to Andreas
+    * Added a few demonstration programs: md5sum, sha1sum,
+      dh_client, dh_server, rsa_genkey, rsa_sign, rsa_verify
+    * Added new bignum import and export helper functions
+    * Rewrote README.txt in program/ssl/ca to better explain
+      how to create a test PKI
+
+= Version 0.6 released on 2007-04-01
+
+    * Ciphers used in SSL/TLS can now be disabled at compile
+      time, to reduce the memory footprint on embedded systems
+    * Added multiply assembly code for the TriCore and modified
+      havege_struct for this processor, thanks to David Patiño
+    * Added multiply assembly code for 64-bit PowerPCs,
+      thanks to Peking University and the OSU Open Source Lab
+    * Added experimental support of Quantum Cryptography
+    * Added support for autoconf, contributed by Arnaud Cornet
+    * Fixed "long long" compilation issues on IA-64 and PPC64
+    * Fixed a bug introduced in xyssl-0.5/timing.c: hardclock
+      was not being correctly defined on ARM and MIPS
+
+= Version 0.5 released on 2007-03-01
+
+    * Added multiply assembly code for SPARC and Alpha
+    * Added (beta) support for non-blocking I/O operations
+    * Implemented session resuming and client authentication
+    * Fixed some portability issues on WinCE, MINIX 3, Plan9
+      (thanks to Benjamin Newman), HP-UX, FreeBSD and Solaris
+    * Improved the performance of the EDH key exchange
+    * Fixed a bug that caused valid packets with a payload
+      size of 16384 bytes to be rejected
+
+= Version 0.4 released on 2007-02-01
+
+    * Added support for Ephemeral Diffie-Hellman key exchange
+    * Added multiply asm code for SSE2, ARM, PPC, MIPS and M68K
+    * Various improvement to the modular exponentiation code
+    * Rewrote the headers to generate the API docs with doxygen
+    * Fixed a bug in ssl_encrypt_buf (incorrect padding was
+      generated) and in ssl_parse_client_hello (max. client
+      version was not properly set), thanks to Didier Rebeix
+    * Fixed another bug in ssl_parse_client_hello: clients with
+      cipherlists larger than 96 bytes were incorrectly rejected
+    * Fixed a couple memory leak in x509_read.c
+
+= Version 0.3 released on 2007-01-01
+
+    * Added server-side SSLv3 and TLSv1.0 support
+    * Multiple fixes to enhance the compatibility with g++,
+      thanks to Xosé Antón Otero Ferreira
+    * Fixed a bug in the CBC code, thanks to dowst; also,
+      the bignum code is no longer dependent on long long
+    * Updated rsa_pkcs1_sign to handle arbitrary large inputs
+    * Updated timing.c for improved compatibility with i386
+      and 486 processors, thanks to Arnaud Cornet
+
+= Version 0.2 released on 2006-12-01
+
+    * Updated timing.c to support ARM and MIPS arch
+    * Updated the MPI code to support 8086 on MSVC 1.5
+    * Added the copyright notice at the top of havege.h
+    * Fixed a bug in sha2_hmac, thanks to newsoft/Wenfang Zhang
+    * Fixed a bug reported by Adrian Rüegsegger in x509_read_key
+    * Fixed a bug reported by Torsten Lauter in ssl_read_record
+    * Fixed a bug in rsa_check_privkey that would wrongly cause
+      valid RSA keys to be dismissed (thanks to oldwolf)
+    * Fixed a bug in mpi_is_prime that caused some primes to fail
+      the Miller-Rabin primality test
+
+    I'd also like to thank Younès Hafri for the CRUX linux port,
+    Khalil Petit who added XySSL into pkgsrc and Arnaud Cornet
+    who maintains the Debian package :-)
+
+= Version 0.1 released on 2006-11-01