diff options
Diffstat (limited to 'lib/mbedtls-2.27.0/library/pk_wrap.c')
| -rw-r--r-- | lib/mbedtls-2.27.0/library/pk_wrap.c | 1069 |
1 files changed, 0 insertions, 1069 deletions
diff --git a/lib/mbedtls-2.27.0/library/pk_wrap.c b/lib/mbedtls-2.27.0/library/pk_wrap.c deleted file mode 100644 index 107e912..0000000 --- a/lib/mbedtls-2.27.0/library/pk_wrap.c +++ /dev/null @@ -1,1069 +0,0 @@ -/* - * Public Key abstraction layer: wrapper functions - * - * Copyright The Mbed TLS Contributors - * SPDX-License-Identifier: Apache-2.0 - * - * Licensed under the Apache License, Version 2.0 (the "License"); you may - * not use this file except in compliance with the License. - * You may obtain a copy of the License at - * - * http://www.apache.org/licenses/LICENSE-2.0 - * - * Unless required by applicable law or agreed to in writing, software - * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT - * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. - * See the License for the specific language governing permissions and - * limitations under the License. - */ - -#include "common.h" - -#if defined(MBEDTLS_PK_C) -#include "mbedtls/pk_internal.h" -#include "mbedtls/error.h" - -/* Even if RSA not activated, for the sake of RSA-alt */ -#include "mbedtls/rsa.h" - -#include <string.h> - -#if defined(MBEDTLS_ECP_C) -#include "mbedtls/ecp.h" -#endif - -#if defined(MBEDTLS_ECDSA_C) -#include "mbedtls/ecdsa.h" -#endif - -#if defined(MBEDTLS_USE_PSA_CRYPTO) -#include "mbedtls/asn1write.h" -#endif - -#if defined(MBEDTLS_PK_RSA_ALT_SUPPORT) -#include "mbedtls/platform_util.h" -#endif - -#if defined(MBEDTLS_USE_PSA_CRYPTO) -#include "psa/crypto.h" -#include "mbedtls/psa_util.h" -#include "mbedtls/asn1.h" -#endif - -#if defined(MBEDTLS_PLATFORM_C) -#include "mbedtls/platform.h" -#else -#include <stdlib.h> -#define mbedtls_calloc calloc -#define mbedtls_free free -#endif - -#include <limits.h> -#include <stdint.h> - -#if defined(MBEDTLS_RSA_C) -static int rsa_can_do( mbedtls_pk_type_t type ) -{ - return( type == MBEDTLS_PK_RSA || - type == MBEDTLS_PK_RSASSA_PSS ); -} - -static size_t rsa_get_bitlen( const void *ctx ) -{ - const mbedtls_rsa_context * rsa = (const mbedtls_rsa_context *) ctx; - return( 8 * mbedtls_rsa_get_len( rsa ) ); -} - -static int rsa_verify_wrap( void *ctx, mbedtls_md_type_t md_alg, - const unsigned char *hash, size_t hash_len, - const unsigned char *sig, size_t sig_len ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - mbedtls_rsa_context * rsa = (mbedtls_rsa_context *) ctx; - size_t rsa_len = mbedtls_rsa_get_len( rsa ); - -#if SIZE_MAX > UINT_MAX - if( md_alg == MBEDTLS_MD_NONE && UINT_MAX < hash_len ) - return( MBEDTLS_ERR_PK_BAD_INPUT_DATA ); -#endif /* SIZE_MAX > UINT_MAX */ - - if( sig_len < rsa_len ) - return( MBEDTLS_ERR_RSA_VERIFY_FAILED ); - - if( ( ret = mbedtls_rsa_pkcs1_verify( rsa, NULL, NULL, - MBEDTLS_RSA_PUBLIC, md_alg, - (unsigned int) hash_len, hash, sig ) ) != 0 ) - return( ret ); - - /* The buffer contains a valid signature followed by extra data. - * We have a special error code for that so that so that callers can - * use mbedtls_pk_verify() to check "Does the buffer start with a - * valid signature?" and not just "Does the buffer contain a valid - * signature?". */ - if( sig_len > rsa_len ) - return( MBEDTLS_ERR_PK_SIG_LEN_MISMATCH ); - - return( 0 ); -} - -static int rsa_sign_wrap( void *ctx, mbedtls_md_type_t md_alg, - const unsigned char *hash, size_t hash_len, - unsigned char *sig, size_t *sig_len, - int (*f_rng)(void *, unsigned char *, size_t), void *p_rng ) -{ - mbedtls_rsa_context * rsa = (mbedtls_rsa_context *) ctx; - -#if SIZE_MAX > UINT_MAX - if( md_alg == MBEDTLS_MD_NONE && UINT_MAX < hash_len ) - return( MBEDTLS_ERR_PK_BAD_INPUT_DATA ); -#endif /* SIZE_MAX > UINT_MAX */ - - *sig_len = mbedtls_rsa_get_len( rsa ); - - return( mbedtls_rsa_pkcs1_sign( rsa, f_rng, p_rng, MBEDTLS_RSA_PRIVATE, - md_alg, (unsigned int) hash_len, hash, sig ) ); -} - -static int rsa_decrypt_wrap( void *ctx, - const unsigned char *input, size_t ilen, - unsigned char *output, size_t *olen, size_t osize, - int (*f_rng)(void *, unsigned char *, size_t), void *p_rng ) -{ - mbedtls_rsa_context * rsa = (mbedtls_rsa_context *) ctx; - - if( ilen != mbedtls_rsa_get_len( rsa ) ) - return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA ); - - return( mbedtls_rsa_pkcs1_decrypt( rsa, f_rng, p_rng, - MBEDTLS_RSA_PRIVATE, olen, input, output, osize ) ); -} - -static int rsa_encrypt_wrap( void *ctx, - const unsigned char *input, size_t ilen, - unsigned char *output, size_t *olen, size_t osize, - int (*f_rng)(void *, unsigned char *, size_t), void *p_rng ) -{ - mbedtls_rsa_context * rsa = (mbedtls_rsa_context *) ctx; - *olen = mbedtls_rsa_get_len( rsa ); - - if( *olen > osize ) - return( MBEDTLS_ERR_RSA_OUTPUT_TOO_LARGE ); - - return( mbedtls_rsa_pkcs1_encrypt( rsa, f_rng, p_rng, MBEDTLS_RSA_PUBLIC, - ilen, input, output ) ); -} - -static int rsa_check_pair_wrap( const void *pub, const void *prv ) -{ - return( mbedtls_rsa_check_pub_priv( (const mbedtls_rsa_context *) pub, - (const mbedtls_rsa_context *) prv ) ); -} - -static void *rsa_alloc_wrap( void ) -{ - void *ctx = mbedtls_calloc( 1, sizeof( mbedtls_rsa_context ) ); - - if( ctx != NULL ) - mbedtls_rsa_init( (mbedtls_rsa_context *) ctx, 0, 0 ); - - return( ctx ); -} - -static void rsa_free_wrap( void *ctx ) -{ - mbedtls_rsa_free( (mbedtls_rsa_context *) ctx ); - mbedtls_free( ctx ); -} - -static void rsa_debug( const void *ctx, mbedtls_pk_debug_item *items ) -{ - items->type = MBEDTLS_PK_DEBUG_MPI; - items->name = "rsa.N"; - items->value = &( ((mbedtls_rsa_context *) ctx)->N ); - - items++; - - items->type = MBEDTLS_PK_DEBUG_MPI; - items->name = "rsa.E"; - items->value = &( ((mbedtls_rsa_context *) ctx)->E ); -} - -const mbedtls_pk_info_t mbedtls_rsa_info = { - MBEDTLS_PK_RSA, - "RSA", - rsa_get_bitlen, - rsa_can_do, - rsa_verify_wrap, - rsa_sign_wrap, -#if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE) - NULL, - NULL, -#endif - rsa_decrypt_wrap, - rsa_encrypt_wrap, - rsa_check_pair_wrap, - rsa_alloc_wrap, - rsa_free_wrap, -#if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE) - NULL, - NULL, -#endif - rsa_debug, -}; -#endif /* MBEDTLS_RSA_C */ - -#if defined(MBEDTLS_ECP_C) -/* - * Generic EC key - */ -static int eckey_can_do( mbedtls_pk_type_t type ) -{ - return( type == MBEDTLS_PK_ECKEY || - type == MBEDTLS_PK_ECKEY_DH || - type == MBEDTLS_PK_ECDSA ); -} - -static size_t eckey_get_bitlen( const void *ctx ) -{ - return( ((mbedtls_ecp_keypair *) ctx)->grp.pbits ); -} - -#if defined(MBEDTLS_ECDSA_C) -/* Forward declarations */ -static int ecdsa_verify_wrap( void *ctx, mbedtls_md_type_t md_alg, - const unsigned char *hash, size_t hash_len, - const unsigned char *sig, size_t sig_len ); - -static int ecdsa_sign_wrap( void *ctx, mbedtls_md_type_t md_alg, - const unsigned char *hash, size_t hash_len, - unsigned char *sig, size_t *sig_len, - int (*f_rng)(void *, unsigned char *, size_t), void *p_rng ); - -static int eckey_verify_wrap( void *ctx, mbedtls_md_type_t md_alg, - const unsigned char *hash, size_t hash_len, - const unsigned char *sig, size_t sig_len ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - mbedtls_ecdsa_context ecdsa; - - mbedtls_ecdsa_init( &ecdsa ); - - if( ( ret = mbedtls_ecdsa_from_keypair( &ecdsa, ctx ) ) == 0 ) - ret = ecdsa_verify_wrap( &ecdsa, md_alg, hash, hash_len, sig, sig_len ); - - mbedtls_ecdsa_free( &ecdsa ); - - return( ret ); -} - -static int eckey_sign_wrap( void *ctx, mbedtls_md_type_t md_alg, - const unsigned char *hash, size_t hash_len, - unsigned char *sig, size_t *sig_len, - int (*f_rng)(void *, unsigned char *, size_t), void *p_rng ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - mbedtls_ecdsa_context ecdsa; - - mbedtls_ecdsa_init( &ecdsa ); - - if( ( ret = mbedtls_ecdsa_from_keypair( &ecdsa, ctx ) ) == 0 ) - ret = ecdsa_sign_wrap( &ecdsa, md_alg, hash, hash_len, sig, sig_len, - f_rng, p_rng ); - - mbedtls_ecdsa_free( &ecdsa ); - - return( ret ); -} - -#if defined(MBEDTLS_ECP_RESTARTABLE) -/* Forward declarations */ -static int ecdsa_verify_rs_wrap( void *ctx, mbedtls_md_type_t md_alg, - const unsigned char *hash, size_t hash_len, - const unsigned char *sig, size_t sig_len, - void *rs_ctx ); - -static int ecdsa_sign_rs_wrap( void *ctx, mbedtls_md_type_t md_alg, - const unsigned char *hash, size_t hash_len, - unsigned char *sig, size_t *sig_len, - int (*f_rng)(void *, unsigned char *, size_t), void *p_rng, - void *rs_ctx ); - -/* - * Restart context for ECDSA operations with ECKEY context - * - * We need to store an actual ECDSA context, as we need to pass the same to - * the underlying ecdsa function, so we can't create it on the fly every time. - */ -typedef struct -{ - mbedtls_ecdsa_restart_ctx ecdsa_rs; - mbedtls_ecdsa_context ecdsa_ctx; -} eckey_restart_ctx; - -static void *eckey_rs_alloc( void ) -{ - eckey_restart_ctx *rs_ctx; - - void *ctx = mbedtls_calloc( 1, sizeof( eckey_restart_ctx ) ); - - if( ctx != NULL ) - { - rs_ctx = ctx; - mbedtls_ecdsa_restart_init( &rs_ctx->ecdsa_rs ); - mbedtls_ecdsa_init( &rs_ctx->ecdsa_ctx ); - } - - return( ctx ); -} - -static void eckey_rs_free( void *ctx ) -{ - eckey_restart_ctx *rs_ctx; - - if( ctx == NULL) - return; - - rs_ctx = ctx; - mbedtls_ecdsa_restart_free( &rs_ctx->ecdsa_rs ); - mbedtls_ecdsa_free( &rs_ctx->ecdsa_ctx ); - - mbedtls_free( ctx ); -} - -static int eckey_verify_rs_wrap( void *ctx, mbedtls_md_type_t md_alg, - const unsigned char *hash, size_t hash_len, - const unsigned char *sig, size_t sig_len, - void *rs_ctx ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - eckey_restart_ctx *rs = rs_ctx; - - /* Should never happen */ - if( rs == NULL ) - return( MBEDTLS_ERR_PK_BAD_INPUT_DATA ); - - /* set up our own sub-context if needed (that is, on first run) */ - if( rs->ecdsa_ctx.grp.pbits == 0 ) - MBEDTLS_MPI_CHK( mbedtls_ecdsa_from_keypair( &rs->ecdsa_ctx, ctx ) ); - - MBEDTLS_MPI_CHK( ecdsa_verify_rs_wrap( &rs->ecdsa_ctx, - md_alg, hash, hash_len, - sig, sig_len, &rs->ecdsa_rs ) ); - -cleanup: - return( ret ); -} - -static int eckey_sign_rs_wrap( void *ctx, mbedtls_md_type_t md_alg, - const unsigned char *hash, size_t hash_len, - unsigned char *sig, size_t *sig_len, - int (*f_rng)(void *, unsigned char *, size_t), void *p_rng, - void *rs_ctx ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - eckey_restart_ctx *rs = rs_ctx; - - /* Should never happen */ - if( rs == NULL ) - return( MBEDTLS_ERR_PK_BAD_INPUT_DATA ); - - /* set up our own sub-context if needed (that is, on first run) */ - if( rs->ecdsa_ctx.grp.pbits == 0 ) - MBEDTLS_MPI_CHK( mbedtls_ecdsa_from_keypair( &rs->ecdsa_ctx, ctx ) ); - - MBEDTLS_MPI_CHK( ecdsa_sign_rs_wrap( &rs->ecdsa_ctx, md_alg, - hash, hash_len, sig, sig_len, - f_rng, p_rng, &rs->ecdsa_rs ) ); - -cleanup: - return( ret ); -} -#endif /* MBEDTLS_ECP_RESTARTABLE */ -#endif /* MBEDTLS_ECDSA_C */ - -static int eckey_check_pair( const void *pub, const void *prv ) -{ - return( mbedtls_ecp_check_pub_priv( (const mbedtls_ecp_keypair *) pub, - (const mbedtls_ecp_keypair *) prv ) ); -} - -static void *eckey_alloc_wrap( void ) -{ - void *ctx = mbedtls_calloc( 1, sizeof( mbedtls_ecp_keypair ) ); - - if( ctx != NULL ) - mbedtls_ecp_keypair_init( ctx ); - - return( ctx ); -} - -static void eckey_free_wrap( void *ctx ) -{ - mbedtls_ecp_keypair_free( (mbedtls_ecp_keypair *) ctx ); - mbedtls_free( ctx ); -} - -static void eckey_debug( const void *ctx, mbedtls_pk_debug_item *items ) -{ - items->type = MBEDTLS_PK_DEBUG_ECP; - items->name = "eckey.Q"; - items->value = &( ((mbedtls_ecp_keypair *) ctx)->Q ); -} - -const mbedtls_pk_info_t mbedtls_eckey_info = { - MBEDTLS_PK_ECKEY, - "EC", - eckey_get_bitlen, - eckey_can_do, -#if defined(MBEDTLS_ECDSA_C) - eckey_verify_wrap, - eckey_sign_wrap, -#if defined(MBEDTLS_ECP_RESTARTABLE) - eckey_verify_rs_wrap, - eckey_sign_rs_wrap, -#endif -#else /* MBEDTLS_ECDSA_C */ - NULL, - NULL, -#endif /* MBEDTLS_ECDSA_C */ - NULL, - NULL, - eckey_check_pair, - eckey_alloc_wrap, - eckey_free_wrap, -#if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE) - eckey_rs_alloc, - eckey_rs_free, -#endif - eckey_debug, -}; - -/* - * EC key restricted to ECDH - */ -static int eckeydh_can_do( mbedtls_pk_type_t type ) -{ - return( type == MBEDTLS_PK_ECKEY || - type == MBEDTLS_PK_ECKEY_DH ); -} - -const mbedtls_pk_info_t mbedtls_eckeydh_info = { - MBEDTLS_PK_ECKEY_DH, - "EC_DH", - eckey_get_bitlen, /* Same underlying key structure */ - eckeydh_can_do, - NULL, - NULL, -#if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE) - NULL, - NULL, -#endif - NULL, - NULL, - eckey_check_pair, - eckey_alloc_wrap, /* Same underlying key structure */ - eckey_free_wrap, /* Same underlying key structure */ -#if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE) - NULL, - NULL, -#endif - eckey_debug, /* Same underlying key structure */ -}; -#endif /* MBEDTLS_ECP_C */ - -#if defined(MBEDTLS_ECDSA_C) -static int ecdsa_can_do( mbedtls_pk_type_t type ) -{ - return( type == MBEDTLS_PK_ECDSA ); -} - -#if defined(MBEDTLS_USE_PSA_CRYPTO) -/* - * An ASN.1 encoded signature is a sequence of two ASN.1 integers. Parse one of - * those integers and convert it to the fixed-length encoding expected by PSA. - */ -static int extract_ecdsa_sig_int( unsigned char **from, const unsigned char *end, - unsigned char *to, size_t to_len ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - size_t unpadded_len, padding_len; - - if( ( ret = mbedtls_asn1_get_tag( from, end, &unpadded_len, - MBEDTLS_ASN1_INTEGER ) ) != 0 ) - { - return( ret ); - } - - while( unpadded_len > 0 && **from == 0x00 ) - { - ( *from )++; - unpadded_len--; - } - - if( unpadded_len > to_len || unpadded_len == 0 ) - return( MBEDTLS_ERR_ASN1_LENGTH_MISMATCH ); - - padding_len = to_len - unpadded_len; - memset( to, 0x00, padding_len ); - memcpy( to + padding_len, *from, unpadded_len ); - ( *from ) += unpadded_len; - - return( 0 ); -} - -/* - * Convert a signature from an ASN.1 sequence of two integers - * to a raw {r,s} buffer. Note: the provided sig buffer must be at least - * twice as big as int_size. - */ -static int extract_ecdsa_sig( unsigned char **p, const unsigned char *end, - unsigned char *sig, size_t int_size ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - size_t tmp_size; - - if( ( ret = mbedtls_asn1_get_tag( p, end, &tmp_size, - MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 ) - return( ret ); - - /* Extract r */ - if( ( ret = extract_ecdsa_sig_int( p, end, sig, int_size ) ) != 0 ) - return( ret ); - /* Extract s */ - if( ( ret = extract_ecdsa_sig_int( p, end, sig + int_size, int_size ) ) != 0 ) - return( ret ); - - return( 0 ); -} - -static int ecdsa_verify_wrap( void *ctx_arg, mbedtls_md_type_t md_alg, - const unsigned char *hash, size_t hash_len, - const unsigned char *sig, size_t sig_len ) -{ - mbedtls_ecdsa_context *ctx = ctx_arg; - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - psa_key_attributes_t attributes = PSA_KEY_ATTRIBUTES_INIT; - psa_key_id_t key_id = 0; - psa_status_t status; - mbedtls_pk_context key; - int key_len; - /* see ECP_PUB_DER_MAX_BYTES in pkwrite.c */ - unsigned char buf[30 + 2 * MBEDTLS_ECP_MAX_BYTES]; - unsigned char *p; - mbedtls_pk_info_t pk_info = mbedtls_eckey_info; - psa_algorithm_t psa_sig_md = PSA_ALG_ECDSA_ANY; - size_t curve_bits; - psa_ecc_family_t curve = - mbedtls_ecc_group_to_psa( ctx->grp.id, &curve_bits ); - const size_t signature_part_size = ( ctx->grp.nbits + 7 ) / 8; - ((void) md_alg); - - if( curve == 0 ) - return( MBEDTLS_ERR_PK_BAD_INPUT_DATA ); - - /* mbedtls_pk_write_pubkey() expects a full PK context; - * re-construct one to make it happy */ - key.pk_info = &pk_info; - key.pk_ctx = ctx; - p = buf + sizeof( buf ); - key_len = mbedtls_pk_write_pubkey( &p, buf, &key ); - if( key_len <= 0 ) - return( MBEDTLS_ERR_PK_BAD_INPUT_DATA ); - - psa_set_key_type( &attributes, PSA_KEY_TYPE_ECC_PUBLIC_KEY( curve ) ); - psa_set_key_usage_flags( &attributes, PSA_KEY_USAGE_VERIFY_HASH ); - psa_set_key_algorithm( &attributes, psa_sig_md ); - - status = psa_import_key( &attributes, - buf + sizeof( buf ) - key_len, key_len, - &key_id ); - if( status != PSA_SUCCESS ) - { - ret = mbedtls_psa_err_translate_pk( status ); - goto cleanup; - } - - /* We don't need the exported key anymore and can - * reuse its buffer for signature extraction. */ - if( 2 * signature_part_size > sizeof( buf ) ) - { - ret = MBEDTLS_ERR_PK_BAD_INPUT_DATA; - goto cleanup; - } - - p = (unsigned char*) sig; - if( ( ret = extract_ecdsa_sig( &p, sig + sig_len, buf, - signature_part_size ) ) != 0 ) - { - goto cleanup; - } - - if( psa_verify_hash( key_id, psa_sig_md, - hash, hash_len, - buf, 2 * signature_part_size ) - != PSA_SUCCESS ) - { - ret = MBEDTLS_ERR_ECP_VERIFY_FAILED; - goto cleanup; - } - - if( p != sig + sig_len ) - { - ret = MBEDTLS_ERR_PK_SIG_LEN_MISMATCH; - goto cleanup; - } - ret = 0; - -cleanup: - psa_destroy_key( key_id ); - return( ret ); -} -#else /* MBEDTLS_USE_PSA_CRYPTO */ -static int ecdsa_verify_wrap( void *ctx, mbedtls_md_type_t md_alg, - const unsigned char *hash, size_t hash_len, - const unsigned char *sig, size_t sig_len ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - ((void) md_alg); - - ret = mbedtls_ecdsa_read_signature( (mbedtls_ecdsa_context *) ctx, - hash, hash_len, sig, sig_len ); - - if( ret == MBEDTLS_ERR_ECP_SIG_LEN_MISMATCH ) - return( MBEDTLS_ERR_PK_SIG_LEN_MISMATCH ); - - return( ret ); -} -#endif /* MBEDTLS_USE_PSA_CRYPTO */ - -static int ecdsa_sign_wrap( void *ctx, mbedtls_md_type_t md_alg, - const unsigned char *hash, size_t hash_len, - unsigned char *sig, size_t *sig_len, - int (*f_rng)(void *, unsigned char *, size_t), void *p_rng ) -{ - return( mbedtls_ecdsa_write_signature( (mbedtls_ecdsa_context *) ctx, - md_alg, hash, hash_len, sig, sig_len, f_rng, p_rng ) ); -} - -#if defined(MBEDTLS_ECP_RESTARTABLE) -static int ecdsa_verify_rs_wrap( void *ctx, mbedtls_md_type_t md_alg, - const unsigned char *hash, size_t hash_len, - const unsigned char *sig, size_t sig_len, - void *rs_ctx ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - ((void) md_alg); - - ret = mbedtls_ecdsa_read_signature_restartable( - (mbedtls_ecdsa_context *) ctx, - hash, hash_len, sig, sig_len, - (mbedtls_ecdsa_restart_ctx *) rs_ctx ); - - if( ret == MBEDTLS_ERR_ECP_SIG_LEN_MISMATCH ) - return( MBEDTLS_ERR_PK_SIG_LEN_MISMATCH ); - - return( ret ); -} - -static int ecdsa_sign_rs_wrap( void *ctx, mbedtls_md_type_t md_alg, - const unsigned char *hash, size_t hash_len, - unsigned char *sig, size_t *sig_len, - int (*f_rng)(void *, unsigned char *, size_t), void *p_rng, - void *rs_ctx ) -{ - return( mbedtls_ecdsa_write_signature_restartable( - (mbedtls_ecdsa_context *) ctx, - md_alg, hash, hash_len, sig, sig_len, f_rng, p_rng, - (mbedtls_ecdsa_restart_ctx *) rs_ctx ) ); - -} -#endif /* MBEDTLS_ECP_RESTARTABLE */ - -static void *ecdsa_alloc_wrap( void ) -{ - void *ctx = mbedtls_calloc( 1, sizeof( mbedtls_ecdsa_context ) ); - - if( ctx != NULL ) - mbedtls_ecdsa_init( (mbedtls_ecdsa_context *) ctx ); - - return( ctx ); -} - -static void ecdsa_free_wrap( void *ctx ) -{ - mbedtls_ecdsa_free( (mbedtls_ecdsa_context *) ctx ); - mbedtls_free( ctx ); -} - -#if defined(MBEDTLS_ECP_RESTARTABLE) -static void *ecdsa_rs_alloc( void ) -{ - void *ctx = mbedtls_calloc( 1, sizeof( mbedtls_ecdsa_restart_ctx ) ); - - if( ctx != NULL ) - mbedtls_ecdsa_restart_init( ctx ); - - return( ctx ); -} - -static void ecdsa_rs_free( void *ctx ) -{ - mbedtls_ecdsa_restart_free( ctx ); - mbedtls_free( ctx ); -} -#endif /* MBEDTLS_ECP_RESTARTABLE */ - -const mbedtls_pk_info_t mbedtls_ecdsa_info = { - MBEDTLS_PK_ECDSA, - "ECDSA", - eckey_get_bitlen, /* Compatible key structures */ - ecdsa_can_do, - ecdsa_verify_wrap, - ecdsa_sign_wrap, -#if defined(MBEDTLS_ECP_RESTARTABLE) - ecdsa_verify_rs_wrap, - ecdsa_sign_rs_wrap, -#endif - NULL, - NULL, - eckey_check_pair, /* Compatible key structures */ - ecdsa_alloc_wrap, - ecdsa_free_wrap, -#if defined(MBEDTLS_ECP_RESTARTABLE) - ecdsa_rs_alloc, - ecdsa_rs_free, -#endif - eckey_debug, /* Compatible key structures */ -}; -#endif /* MBEDTLS_ECDSA_C */ - -#if defined(MBEDTLS_PK_RSA_ALT_SUPPORT) -/* - * Support for alternative RSA-private implementations - */ - -static int rsa_alt_can_do( mbedtls_pk_type_t type ) -{ - return( type == MBEDTLS_PK_RSA ); -} - -static size_t rsa_alt_get_bitlen( const void *ctx ) -{ - const mbedtls_rsa_alt_context *rsa_alt = (const mbedtls_rsa_alt_context *) ctx; - - return( 8 * rsa_alt->key_len_func( rsa_alt->key ) ); -} - -static int rsa_alt_sign_wrap( void *ctx, mbedtls_md_type_t md_alg, - const unsigned char *hash, size_t hash_len, - unsigned char *sig, size_t *sig_len, - int (*f_rng)(void *, unsigned char *, size_t), void *p_rng ) -{ - mbedtls_rsa_alt_context *rsa_alt = (mbedtls_rsa_alt_context *) ctx; - -#if SIZE_MAX > UINT_MAX - if( UINT_MAX < hash_len ) - return( MBEDTLS_ERR_PK_BAD_INPUT_DATA ); -#endif /* SIZE_MAX > UINT_MAX */ - - *sig_len = rsa_alt->key_len_func( rsa_alt->key ); - if( *sig_len > MBEDTLS_PK_SIGNATURE_MAX_SIZE ) - return( MBEDTLS_ERR_PK_BAD_INPUT_DATA ); - - return( rsa_alt->sign_func( rsa_alt->key, f_rng, p_rng, MBEDTLS_RSA_PRIVATE, - md_alg, (unsigned int) hash_len, hash, sig ) ); -} - -static int rsa_alt_decrypt_wrap( void *ctx, - const unsigned char *input, size_t ilen, - unsigned char *output, size_t *olen, size_t osize, - int (*f_rng)(void *, unsigned char *, size_t), void *p_rng ) -{ - mbedtls_rsa_alt_context *rsa_alt = (mbedtls_rsa_alt_context *) ctx; - - ((void) f_rng); - ((void) p_rng); - - if( ilen != rsa_alt->key_len_func( rsa_alt->key ) ) - return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA ); - - return( rsa_alt->decrypt_func( rsa_alt->key, - MBEDTLS_RSA_PRIVATE, olen, input, output, osize ) ); -} - -#if defined(MBEDTLS_RSA_C) -static int rsa_alt_check_pair( const void *pub, const void *prv ) -{ - unsigned char sig[MBEDTLS_MPI_MAX_SIZE]; - unsigned char hash[32]; - size_t sig_len = 0; - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - - if( rsa_alt_get_bitlen( prv ) != rsa_get_bitlen( pub ) ) - return( MBEDTLS_ERR_RSA_KEY_CHECK_FAILED ); - - memset( hash, 0x2a, sizeof( hash ) ); - - if( ( ret = rsa_alt_sign_wrap( (void *) prv, MBEDTLS_MD_NONE, - hash, sizeof( hash ), - sig, &sig_len, NULL, NULL ) ) != 0 ) - { - return( ret ); - } - - if( rsa_verify_wrap( (void *) pub, MBEDTLS_MD_NONE, - hash, sizeof( hash ), sig, sig_len ) != 0 ) - { - return( MBEDTLS_ERR_RSA_KEY_CHECK_FAILED ); - } - - return( 0 ); -} -#endif /* MBEDTLS_RSA_C */ - -static void *rsa_alt_alloc_wrap( void ) -{ - void *ctx = mbedtls_calloc( 1, sizeof( mbedtls_rsa_alt_context ) ); - - if( ctx != NULL ) - memset( ctx, 0, sizeof( mbedtls_rsa_alt_context ) ); - - return( ctx ); -} - -static void rsa_alt_free_wrap( void *ctx ) -{ - mbedtls_platform_zeroize( ctx, sizeof( mbedtls_rsa_alt_context ) ); - mbedtls_free( ctx ); -} - -const mbedtls_pk_info_t mbedtls_rsa_alt_info = { - MBEDTLS_PK_RSA_ALT, - "RSA-alt", - rsa_alt_get_bitlen, - rsa_alt_can_do, - NULL, - rsa_alt_sign_wrap, -#if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE) - NULL, - NULL, -#endif - rsa_alt_decrypt_wrap, - NULL, -#if defined(MBEDTLS_RSA_C) - rsa_alt_check_pair, -#else - NULL, -#endif - rsa_alt_alloc_wrap, - rsa_alt_free_wrap, -#if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE) - NULL, - NULL, -#endif - NULL, -}; - -#endif /* MBEDTLS_PK_RSA_ALT_SUPPORT */ - -#if defined(MBEDTLS_USE_PSA_CRYPTO) - -static void *pk_opaque_alloc_wrap( void ) -{ - void *ctx = mbedtls_calloc( 1, sizeof( psa_key_id_t ) ); - - /* no _init() function to call, an calloc() already zeroized */ - - return( ctx ); -} - -static void pk_opaque_free_wrap( void *ctx ) -{ - mbedtls_platform_zeroize( ctx, sizeof( psa_key_id_t ) ); - mbedtls_free( ctx ); -} - -static size_t pk_opaque_get_bitlen( const void *ctx ) -{ - const psa_key_id_t *key = (const psa_key_id_t *) ctx; - size_t bits; - psa_key_attributes_t attributes = PSA_KEY_ATTRIBUTES_INIT; - - if( PSA_SUCCESS != psa_get_key_attributes( *key, &attributes ) ) - return( 0 ); - - bits = psa_get_key_bits( &attributes ); - psa_reset_key_attributes( &attributes ); - return( bits ); -} - -static int pk_opaque_can_do( mbedtls_pk_type_t type ) -{ - /* For now opaque PSA keys can only wrap ECC keypairs, - * as checked by setup_psa(). - * Also, ECKEY_DH does not really make sense with the current API. */ - return( type == MBEDTLS_PK_ECKEY || - type == MBEDTLS_PK_ECDSA ); -} - -#if defined(MBEDTLS_ECDSA_C) - -/* - * Simultaneously convert and move raw MPI from the beginning of a buffer - * to an ASN.1 MPI at the end of the buffer. - * See also mbedtls_asn1_write_mpi(). - * - * p: pointer to the end of the output buffer - * start: start of the output buffer, and also of the mpi to write at the end - * n_len: length of the mpi to read from start - */ -static int asn1_write_mpibuf( unsigned char **p, unsigned char *start, - size_t n_len ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - size_t len = 0; - - if( (size_t)( *p - start ) < n_len ) - return( MBEDTLS_ERR_ASN1_BUF_TOO_SMALL ); - - len = n_len; - *p -= len; - memmove( *p, start, len ); - - /* ASN.1 DER encoding requires minimal length, so skip leading 0s. - * Neither r nor s should be 0, but as a failsafe measure, still detect - * that rather than overflowing the buffer in case of a PSA error. */ - while( len > 0 && **p == 0x00 ) - { - ++(*p); - --len; - } - - /* this is only reached if the signature was invalid */ - if( len == 0 ) - return( MBEDTLS_ERR_PK_HW_ACCEL_FAILED ); - - /* if the msb is 1, ASN.1 requires that we prepend a 0. - * Neither r nor s can be 0, so we can assume len > 0 at all times. */ - if( **p & 0x80 ) - { - if( *p - start < 1 ) - return( MBEDTLS_ERR_ASN1_BUF_TOO_SMALL ); - - *--(*p) = 0x00; - len += 1; - } - - MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( p, start, len ) ); - MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( p, start, - MBEDTLS_ASN1_INTEGER ) ); - - return( (int) len ); -} - -/* Transcode signature from PSA format to ASN.1 sequence. - * See ecdsa_signature_to_asn1 in ecdsa.c, but with byte buffers instead of - * MPIs, and in-place. - * - * [in/out] sig: the signature pre- and post-transcoding - * [in/out] sig_len: signature length pre- and post-transcoding - * [int] buf_len: the available size the in/out buffer - */ -static int pk_ecdsa_sig_asn1_from_psa( unsigned char *sig, size_t *sig_len, - size_t buf_len ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - size_t len = 0; - const size_t rs_len = *sig_len / 2; - unsigned char *p = sig + buf_len; - - MBEDTLS_ASN1_CHK_ADD( len, asn1_write_mpibuf( &p, sig + rs_len, rs_len ) ); - MBEDTLS_ASN1_CHK_ADD( len, asn1_write_mpibuf( &p, sig, rs_len ) ); - - MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &p, sig, len ) ); - MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &p, sig, - MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ); - - memmove( sig, p, len ); - *sig_len = len; - - return( 0 ); -} - -#endif /* MBEDTLS_ECDSA_C */ - -static int pk_opaque_sign_wrap( void *ctx, mbedtls_md_type_t md_alg, - const unsigned char *hash, size_t hash_len, - unsigned char *sig, size_t *sig_len, - int (*f_rng)(void *, unsigned char *, size_t), void *p_rng ) -{ -#if !defined(MBEDTLS_ECDSA_C) - ((void) ctx); - ((void) md_alg); - ((void) hash); - ((void) hash_len); - ((void) sig); - ((void) sig_len); - ((void) f_rng); - ((void) p_rng); - return( MBEDTLS_ERR_PK_FEATURE_UNAVAILABLE ); -#else /* !MBEDTLS_ECDSA_C */ - const psa_key_id_t *key = (const psa_key_id_t *) ctx; - psa_key_attributes_t attributes = PSA_KEY_ATTRIBUTES_INIT; - psa_algorithm_t alg = PSA_ALG_ECDSA( mbedtls_psa_translate_md( md_alg ) ); - size_t buf_len; - psa_status_t status; - - /* PSA has its own RNG */ - (void) f_rng; - (void) p_rng; - - /* PSA needs an output buffer of known size, but our API doesn't provide - * that information. Assume that the buffer is large enough for a - * maximal-length signature with that key (otherwise the application is - * buggy anyway). */ - status = psa_get_key_attributes( *key, &attributes ); - if( status != PSA_SUCCESS ) - return( mbedtls_psa_err_translate_pk( status ) ); - buf_len = MBEDTLS_ECDSA_MAX_SIG_LEN( psa_get_key_bits( &attributes ) ); - psa_reset_key_attributes( &attributes ); - if( buf_len > MBEDTLS_PK_SIGNATURE_MAX_SIZE ) - return( MBEDTLS_ERR_PK_BAD_INPUT_DATA ); - - /* make the signature */ - status = psa_sign_hash( *key, alg, hash, hash_len, - sig, buf_len, sig_len ); - if( status != PSA_SUCCESS ) - return( mbedtls_psa_err_translate_pk( status ) ); - - /* transcode it to ASN.1 sequence */ - return( pk_ecdsa_sig_asn1_from_psa( sig, sig_len, buf_len ) ); -#endif /* !MBEDTLS_ECDSA_C */ -} - -const mbedtls_pk_info_t mbedtls_pk_opaque_info = { - MBEDTLS_PK_OPAQUE, - "Opaque", - pk_opaque_get_bitlen, - pk_opaque_can_do, - NULL, /* verify - will be done later */ - pk_opaque_sign_wrap, -#if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE) - NULL, /* restartable verify - not relevant */ - NULL, /* restartable sign - not relevant */ -#endif - NULL, /* decrypt - will be done later */ - NULL, /* encrypt - will be done later */ - NULL, /* check_pair - could be done later or left NULL */ - pk_opaque_alloc_wrap, - pk_opaque_free_wrap, -#if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE) - NULL, /* restart alloc - not relevant */ - NULL, /* restart free - not relevant */ -#endif - NULL, /* debug - could be done later, or even left NULL */ -}; - -#endif /* MBEDTLS_USE_PSA_CRYPTO */ - -#endif /* MBEDTLS_PK_C */ |