diff options
Diffstat (limited to 'lib/mbedtls-2.27.0/library/ccm.c')
-rw-r--r-- | lib/mbedtls-2.27.0/library/ccm.c | 547 |
1 files changed, 0 insertions, 547 deletions
diff --git a/lib/mbedtls-2.27.0/library/ccm.c b/lib/mbedtls-2.27.0/library/ccm.c deleted file mode 100644 index 424ee77..0000000 --- a/lib/mbedtls-2.27.0/library/ccm.c +++ /dev/null @@ -1,547 +0,0 @@ -/* - * NIST SP800-38C compliant CCM implementation - * - * 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. - */ - -/* - * Definition of CCM: - * http://csrc.nist.gov/publications/nistpubs/800-38C/SP800-38C_updated-July20_2007.pdf - * RFC 3610 "Counter with CBC-MAC (CCM)" - * - * Related: - * RFC 5116 "An Interface and Algorithms for Authenticated Encryption" - */ - -#include "common.h" - -#if defined(MBEDTLS_CCM_C) - -#include "mbedtls/ccm.h" -#include "mbedtls/platform_util.h" -#include "mbedtls/error.h" - -#include <string.h> - -#if defined(MBEDTLS_SELF_TEST) && defined(MBEDTLS_AES_C) -#if defined(MBEDTLS_PLATFORM_C) -#include "mbedtls/platform.h" -#else -#include <stdio.h> -#define mbedtls_printf printf -#endif /* MBEDTLS_PLATFORM_C */ -#endif /* MBEDTLS_SELF_TEST && MBEDTLS_AES_C */ - -#if !defined(MBEDTLS_CCM_ALT) - -#define CCM_VALIDATE_RET( cond ) \ - MBEDTLS_INTERNAL_VALIDATE_RET( cond, MBEDTLS_ERR_CCM_BAD_INPUT ) -#define CCM_VALIDATE( cond ) \ - MBEDTLS_INTERNAL_VALIDATE( cond ) - -#define CCM_ENCRYPT 0 -#define CCM_DECRYPT 1 - -/* - * Initialize context - */ -void mbedtls_ccm_init( mbedtls_ccm_context *ctx ) -{ - CCM_VALIDATE( ctx != NULL ); - memset( ctx, 0, sizeof( mbedtls_ccm_context ) ); -} - -int mbedtls_ccm_setkey( mbedtls_ccm_context *ctx, - mbedtls_cipher_id_t cipher, - const unsigned char *key, - unsigned int keybits ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - const mbedtls_cipher_info_t *cipher_info; - - CCM_VALIDATE_RET( ctx != NULL ); - CCM_VALIDATE_RET( key != NULL ); - - cipher_info = mbedtls_cipher_info_from_values( cipher, keybits, - MBEDTLS_MODE_ECB ); - if( cipher_info == NULL ) - return( MBEDTLS_ERR_CCM_BAD_INPUT ); - - if( cipher_info->block_size != 16 ) - return( MBEDTLS_ERR_CCM_BAD_INPUT ); - - mbedtls_cipher_free( &ctx->cipher_ctx ); - - if( ( ret = mbedtls_cipher_setup( &ctx->cipher_ctx, cipher_info ) ) != 0 ) - return( ret ); - - if( ( ret = mbedtls_cipher_setkey( &ctx->cipher_ctx, key, keybits, - MBEDTLS_ENCRYPT ) ) != 0 ) - { - return( ret ); - } - - return( 0 ); -} - -/* - * Free context - */ -void mbedtls_ccm_free( mbedtls_ccm_context *ctx ) -{ - if( ctx == NULL ) - return; - mbedtls_cipher_free( &ctx->cipher_ctx ); - mbedtls_platform_zeroize( ctx, sizeof( mbedtls_ccm_context ) ); -} - -/* - * Macros for common operations. - * Results in smaller compiled code than static inline functions. - */ - -/* - * Update the CBC-MAC state in y using a block in b - * (Always using b as the source helps the compiler optimise a bit better.) - */ -#define UPDATE_CBC_MAC \ - for( i = 0; i < 16; i++ ) \ - y[i] ^= b[i]; \ - \ - if( ( ret = mbedtls_cipher_update( &ctx->cipher_ctx, y, 16, y, &olen ) ) != 0 ) \ - return( ret ); - -/* - * Encrypt or decrypt a partial block with CTR - * Warning: using b for temporary storage! src and dst must not be b! - * This avoids allocating one more 16 bytes buffer while allowing src == dst. - */ -#define CTR_CRYPT( dst, src, len ) \ - do \ - { \ - if( ( ret = mbedtls_cipher_update( &ctx->cipher_ctx, ctr, \ - 16, b, &olen ) ) != 0 ) \ - { \ - return( ret ); \ - } \ - \ - for( i = 0; i < (len); i++ ) \ - (dst)[i] = (src)[i] ^ b[i]; \ - } while( 0 ) - -/* - * Authenticated encryption or decryption - */ -static int ccm_auth_crypt( mbedtls_ccm_context *ctx, int mode, size_t length, - const unsigned char *iv, size_t iv_len, - const unsigned char *add, size_t add_len, - const unsigned char *input, unsigned char *output, - unsigned char *tag, size_t tag_len ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - unsigned char i; - unsigned char q; - size_t len_left, olen; - unsigned char b[16]; - unsigned char y[16]; - unsigned char ctr[16]; - const unsigned char *src; - unsigned char *dst; - - /* - * Check length requirements: SP800-38C A.1 - * Additional requirement: a < 2^16 - 2^8 to simplify the code. - * 'length' checked later (when writing it to the first block) - * - * Also, loosen the requirements to enable support for CCM* (IEEE 802.15.4). - */ - if( tag_len == 2 || tag_len > 16 || tag_len % 2 != 0 ) - return( MBEDTLS_ERR_CCM_BAD_INPUT ); - - /* Also implies q is within bounds */ - if( iv_len < 7 || iv_len > 13 ) - return( MBEDTLS_ERR_CCM_BAD_INPUT ); - - if( add_len >= 0xFF00 ) - return( MBEDTLS_ERR_CCM_BAD_INPUT ); - - q = 16 - 1 - (unsigned char) iv_len; - - /* - * First block B_0: - * 0 .. 0 flags - * 1 .. iv_len nonce (aka iv) - * iv_len+1 .. 15 length - * - * With flags as (bits): - * 7 0 - * 6 add present? - * 5 .. 3 (t - 2) / 2 - * 2 .. 0 q - 1 - */ - b[0] = 0; - b[0] |= ( add_len > 0 ) << 6; - b[0] |= ( ( tag_len - 2 ) / 2 ) << 3; - b[0] |= q - 1; - - memcpy( b + 1, iv, iv_len ); - - for( i = 0, len_left = length; i < q; i++, len_left >>= 8 ) - b[15-i] = (unsigned char)( len_left & 0xFF ); - - if( len_left > 0 ) - return( MBEDTLS_ERR_CCM_BAD_INPUT ); - - - /* Start CBC-MAC with first block */ - memset( y, 0, 16 ); - UPDATE_CBC_MAC; - - /* - * If there is additional data, update CBC-MAC with - * add_len, add, 0 (padding to a block boundary) - */ - if( add_len > 0 ) - { - size_t use_len; - len_left = add_len; - src = add; - - memset( b, 0, 16 ); - b[0] = (unsigned char)( ( add_len >> 8 ) & 0xFF ); - b[1] = (unsigned char)( ( add_len ) & 0xFF ); - - use_len = len_left < 16 - 2 ? len_left : 16 - 2; - memcpy( b + 2, src, use_len ); - len_left -= use_len; - src += use_len; - - UPDATE_CBC_MAC; - - while( len_left > 0 ) - { - use_len = len_left > 16 ? 16 : len_left; - - memset( b, 0, 16 ); - memcpy( b, src, use_len ); - UPDATE_CBC_MAC; - - len_left -= use_len; - src += use_len; - } - } - - /* - * Prepare counter block for encryption: - * 0 .. 0 flags - * 1 .. iv_len nonce (aka iv) - * iv_len+1 .. 15 counter (initially 1) - * - * With flags as (bits): - * 7 .. 3 0 - * 2 .. 0 q - 1 - */ - ctr[0] = q - 1; - memcpy( ctr + 1, iv, iv_len ); - memset( ctr + 1 + iv_len, 0, q ); - ctr[15] = 1; - - /* - * Authenticate and {en,de}crypt the message. - * - * The only difference between encryption and decryption is - * the respective order of authentication and {en,de}cryption. - */ - len_left = length; - src = input; - dst = output; - - while( len_left > 0 ) - { - size_t use_len = len_left > 16 ? 16 : len_left; - - if( mode == CCM_ENCRYPT ) - { - memset( b, 0, 16 ); - memcpy( b, src, use_len ); - UPDATE_CBC_MAC; - } - - CTR_CRYPT( dst, src, use_len ); - - if( mode == CCM_DECRYPT ) - { - memset( b, 0, 16 ); - memcpy( b, dst, use_len ); - UPDATE_CBC_MAC; - } - - dst += use_len; - src += use_len; - len_left -= use_len; - - /* - * Increment counter. - * No need to check for overflow thanks to the length check above. - */ - for( i = 0; i < q; i++ ) - if( ++ctr[15-i] != 0 ) - break; - } - - /* - * Authentication: reset counter and crypt/mask internal tag - */ - for( i = 0; i < q; i++ ) - ctr[15-i] = 0; - - CTR_CRYPT( y, y, 16 ); - memcpy( tag, y, tag_len ); - - return( 0 ); -} - -/* - * Authenticated encryption - */ -int mbedtls_ccm_star_encrypt_and_tag( mbedtls_ccm_context *ctx, size_t length, - const unsigned char *iv, size_t iv_len, - const unsigned char *add, size_t add_len, - const unsigned char *input, unsigned char *output, - unsigned char *tag, size_t tag_len ) -{ - CCM_VALIDATE_RET( ctx != NULL ); - CCM_VALIDATE_RET( iv != NULL ); - CCM_VALIDATE_RET( add_len == 0 || add != NULL ); - CCM_VALIDATE_RET( length == 0 || input != NULL ); - CCM_VALIDATE_RET( length == 0 || output != NULL ); - CCM_VALIDATE_RET( tag_len == 0 || tag != NULL ); - return( ccm_auth_crypt( ctx, CCM_ENCRYPT, length, iv, iv_len, - add, add_len, input, output, tag, tag_len ) ); -} - -int mbedtls_ccm_encrypt_and_tag( mbedtls_ccm_context *ctx, size_t length, - const unsigned char *iv, size_t iv_len, - const unsigned char *add, size_t add_len, - const unsigned char *input, unsigned char *output, - unsigned char *tag, size_t tag_len ) -{ - CCM_VALIDATE_RET( ctx != NULL ); - CCM_VALIDATE_RET( iv != NULL ); - CCM_VALIDATE_RET( add_len == 0 || add != NULL ); - CCM_VALIDATE_RET( length == 0 || input != NULL ); - CCM_VALIDATE_RET( length == 0 || output != NULL ); - CCM_VALIDATE_RET( tag_len == 0 || tag != NULL ); - if( tag_len == 0 ) - return( MBEDTLS_ERR_CCM_BAD_INPUT ); - - return( mbedtls_ccm_star_encrypt_and_tag( ctx, length, iv, iv_len, add, - add_len, input, output, tag, tag_len ) ); -} - -/* - * Authenticated decryption - */ -int mbedtls_ccm_star_auth_decrypt( mbedtls_ccm_context *ctx, size_t length, - const unsigned char *iv, size_t iv_len, - const unsigned char *add, size_t add_len, - const unsigned char *input, unsigned char *output, - const unsigned char *tag, size_t tag_len ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - unsigned char check_tag[16]; - unsigned char i; - int diff; - - CCM_VALIDATE_RET( ctx != NULL ); - CCM_VALIDATE_RET( iv != NULL ); - CCM_VALIDATE_RET( add_len == 0 || add != NULL ); - CCM_VALIDATE_RET( length == 0 || input != NULL ); - CCM_VALIDATE_RET( length == 0 || output != NULL ); - CCM_VALIDATE_RET( tag_len == 0 || tag != NULL ); - - if( ( ret = ccm_auth_crypt( ctx, CCM_DECRYPT, length, - iv, iv_len, add, add_len, - input, output, check_tag, tag_len ) ) != 0 ) - { - return( ret ); - } - - /* Check tag in "constant-time" */ - for( diff = 0, i = 0; i < tag_len; i++ ) - diff |= tag[i] ^ check_tag[i]; - - if( diff != 0 ) - { - mbedtls_platform_zeroize( output, length ); - return( MBEDTLS_ERR_CCM_AUTH_FAILED ); - } - - return( 0 ); -} - -int mbedtls_ccm_auth_decrypt( mbedtls_ccm_context *ctx, size_t length, - const unsigned char *iv, size_t iv_len, - const unsigned char *add, size_t add_len, - const unsigned char *input, unsigned char *output, - const unsigned char *tag, size_t tag_len ) -{ - CCM_VALIDATE_RET( ctx != NULL ); - CCM_VALIDATE_RET( iv != NULL ); - CCM_VALIDATE_RET( add_len == 0 || add != NULL ); - CCM_VALIDATE_RET( length == 0 || input != NULL ); - CCM_VALIDATE_RET( length == 0 || output != NULL ); - CCM_VALIDATE_RET( tag_len == 0 || tag != NULL ); - - if( tag_len == 0 ) - return( MBEDTLS_ERR_CCM_BAD_INPUT ); - - return( mbedtls_ccm_star_auth_decrypt( ctx, length, iv, iv_len, add, - add_len, input, output, tag, tag_len ) ); -} -#endif /* !MBEDTLS_CCM_ALT */ - -#if defined(MBEDTLS_SELF_TEST) && defined(MBEDTLS_AES_C) -/* - * Examples 1 to 3 from SP800-38C Appendix C - */ - -#define NB_TESTS 3 -#define CCM_SELFTEST_PT_MAX_LEN 24 -#define CCM_SELFTEST_CT_MAX_LEN 32 -/* - * The data is the same for all tests, only the used length changes - */ -static const unsigned char key_test_data[] = { - 0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, - 0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f -}; - -static const unsigned char iv_test_data[] = { - 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, - 0x18, 0x19, 0x1a, 0x1b -}; - -static const unsigned char ad_test_data[] = { - 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, - 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, - 0x10, 0x11, 0x12, 0x13 -}; - -static const unsigned char msg_test_data[CCM_SELFTEST_PT_MAX_LEN] = { - 0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, - 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, - 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, -}; - -static const size_t iv_len_test_data [NB_TESTS] = { 7, 8, 12 }; -static const size_t add_len_test_data[NB_TESTS] = { 8, 16, 20 }; -static const size_t msg_len_test_data[NB_TESTS] = { 4, 16, 24 }; -static const size_t tag_len_test_data[NB_TESTS] = { 4, 6, 8 }; - -static const unsigned char res_test_data[NB_TESTS][CCM_SELFTEST_CT_MAX_LEN] = { - { 0x71, 0x62, 0x01, 0x5b, 0x4d, 0xac, 0x25, 0x5d }, - { 0xd2, 0xa1, 0xf0, 0xe0, 0x51, 0xea, 0x5f, 0x62, - 0x08, 0x1a, 0x77, 0x92, 0x07, 0x3d, 0x59, 0x3d, - 0x1f, 0xc6, 0x4f, 0xbf, 0xac, 0xcd }, - { 0xe3, 0xb2, 0x01, 0xa9, 0xf5, 0xb7, 0x1a, 0x7a, - 0x9b, 0x1c, 0xea, 0xec, 0xcd, 0x97, 0xe7, 0x0b, - 0x61, 0x76, 0xaa, 0xd9, 0xa4, 0x42, 0x8a, 0xa5, - 0x48, 0x43, 0x92, 0xfb, 0xc1, 0xb0, 0x99, 0x51 } -}; - -int mbedtls_ccm_self_test( int verbose ) -{ - mbedtls_ccm_context ctx; - /* - * Some hardware accelerators require the input and output buffers - * would be in RAM, because the flash is not accessible. - * Use buffers on the stack to hold the test vectors data. - */ - unsigned char plaintext[CCM_SELFTEST_PT_MAX_LEN]; - unsigned char ciphertext[CCM_SELFTEST_CT_MAX_LEN]; - size_t i; - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - - mbedtls_ccm_init( &ctx ); - - if( mbedtls_ccm_setkey( &ctx, MBEDTLS_CIPHER_ID_AES, key_test_data, - 8 * sizeof key_test_data ) != 0 ) - { - if( verbose != 0 ) - mbedtls_printf( " CCM: setup failed" ); - - return( 1 ); - } - - for( i = 0; i < NB_TESTS; i++ ) - { - if( verbose != 0 ) - mbedtls_printf( " CCM-AES #%u: ", (unsigned int) i + 1 ); - - memset( plaintext, 0, CCM_SELFTEST_PT_MAX_LEN ); - memset( ciphertext, 0, CCM_SELFTEST_CT_MAX_LEN ); - memcpy( plaintext, msg_test_data, msg_len_test_data[i] ); - - ret = mbedtls_ccm_encrypt_and_tag( &ctx, msg_len_test_data[i], - iv_test_data, iv_len_test_data[i], - ad_test_data, add_len_test_data[i], - plaintext, ciphertext, - ciphertext + msg_len_test_data[i], - tag_len_test_data[i] ); - - if( ret != 0 || - memcmp( ciphertext, res_test_data[i], - msg_len_test_data[i] + tag_len_test_data[i] ) != 0 ) - { - if( verbose != 0 ) - mbedtls_printf( "failed\n" ); - - return( 1 ); - } - memset( plaintext, 0, CCM_SELFTEST_PT_MAX_LEN ); - - ret = mbedtls_ccm_auth_decrypt( &ctx, msg_len_test_data[i], - iv_test_data, iv_len_test_data[i], - ad_test_data, add_len_test_data[i], - ciphertext, plaintext, - ciphertext + msg_len_test_data[i], - tag_len_test_data[i] ); - - if( ret != 0 || - memcmp( plaintext, msg_test_data, msg_len_test_data[i] ) != 0 ) - { - if( verbose != 0 ) - mbedtls_printf( "failed\n" ); - - return( 1 ); - } - - if( verbose != 0 ) - mbedtls_printf( "passed\n" ); - } - - mbedtls_ccm_free( &ctx ); - - if( verbose != 0 ) - mbedtls_printf( "\n" ); - - return( 0 ); -} - -#endif /* MBEDTLS_SELF_TEST && MBEDTLS_AES_C */ - -#endif /* MBEDTLS_CCM_C */ |