| /* |
| * \file cmac.c |
| * \brief NIST SP800-38B compliant CMAC implementation |
| * |
| * Copyright (C) 2006-2016, ARM Limited, All Rights Reserved |
| * 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. |
| * |
| * This file is part of mbed TLS (https://tls.mbed.org) |
| */ |
| |
| /* |
| * References: |
| * - CMAC: NIST SP 800-38B |
| * - CMAC PRF: RFC 4493 |
| * - Additional test vectors: ISO/IEC 9797-1 |
| */ |
| |
| #if !defined(MBEDTLS_CONFIG_FILE) |
| #include "mbedtls/config.h" |
| #else |
| #include MBEDTLS_CONFIG_FILE |
| #endif |
| |
| #if defined(MBEDTLS_CMAC_C) |
| |
| #include "mbedtls/cmac.h" |
| |
| #include <string.h> |
| |
| |
| #if defined(MBEDTLS_PLATFORM_C) |
| #include "mbedtls/platform.h" |
| #else |
| #include <stdlib.h> |
| #define mbedtls_calloc calloc |
| #define mbedtls_free free |
| #if defined(MBEDTLS_SELF_TEST) && ( defined(MBEDTLS_AES_C) || defined(MBEDTLS_DES_C) ) |
| #include <stdio.h> |
| #define mbedtls_printf printf |
| #endif /* defined(MBEDTLS_SELF_TEST) && ( defined(MBEDTLS_AES_C) || defined(MBEDTLS_DES_C) )*/ |
| #endif /* MBEDTLS_PLATFORM_C */ |
| |
| |
| /* Implementation that should never be optimized out by the compiler */ |
| static void mbedtls_zeroize( void *v, size_t n ) { |
| volatile unsigned char *p = v; while( n-- ) *p++ = 0; |
| } |
| |
| /* |
| * Initialize context |
| */ |
| void mbedtls_cmac_init( mbedtls_cmac_context *ctx ) |
| { |
| memset( ctx, 0, sizeof( mbedtls_cmac_context ) ); |
| } |
| |
| /* |
| * Multiplication by u in the Galois field of GF(2^n) |
| * |
| * As explained in NIST SP 800-38B, this can be computed: |
| * If MSB(p) = 0, then p = (p << 1) |
| * If MSB(p) = 1, then p = (p << 1) ^ R_n |
| * with R_64 = 0x1B and R_128 = 0x87 |
| * |
| * Input and output MUST not point to the same buffer |
| * Block size must be 8 byes or 16 bytes. |
| */ |
| static int cmac_multiply_by_u( unsigned char *output, |
| const unsigned char *input, |
| size_t blocksize ) |
| { |
| const unsigned char R_128 = 0x87; |
| const unsigned char R_64 = 0x1B; |
| unsigned char R_n, mask; |
| unsigned char overflow = 0x00; |
| int i, starting_index; |
| |
| starting_index = blocksize -1; |
| |
| if( blocksize == 16 ) |
| { |
| R_n = R_128; |
| } else if( blocksize == 8 ) |
| { |
| R_n = R_64; |
| } else |
| { |
| return( MBEDTLS_ERR_CMAC_BAD_INPUT ); |
| } |
| |
| for( i = starting_index; i >= 0; i-- ) |
| { |
| output[i] = input[i] << 1 | overflow; |
| overflow = input[i] >> 7; |
| } |
| |
| /* mask = ( input[0] >> 7 ) ? 0xff : 0x00 |
| * using bit operations to avoid branches */ |
| /* MSVC has a warning about unary minus on unsigned, but this is |
| * well-defined and precisely what we want to do here */ |
| #if defined(_MSC_VER) |
| #pragma warning( push ) |
| #pragma warning( disable : 4146 ) |
| #endif |
| mask = - ( input[0] >> 7 ); |
| #if defined(_MSC_VER) |
| #pragma warning( pop ) |
| #endif |
| |
| output[starting_index] ^= R_n & mask; |
| return( 0 ); |
| } |
| |
| /* |
| * Generate subkeys |
| */ |
| static int cmac_generate_subkeys( mbedtls_cmac_context *ctx ) |
| { |
| int ret; |
| unsigned char *L; |
| size_t olen, block_size; |
| |
| block_size = ctx->cipher_ctx.cipher_info->block_size; |
| |
| L = mbedtls_calloc( block_size, sizeof( unsigned char ) ); |
| if( L == NULL ) |
| { |
| ret = MBEDTLS_ERR_CMAC_ALLOC_FAILED; |
| goto exit; |
| } |
| /* Calculate Ek(0) */ |
| if( ( ret = mbedtls_cipher_update( &ctx->cipher_ctx, |
| L, block_size, L, &olen ) ) != 0 ) |
| { |
| goto exit; |
| } |
| |
| /* |
| * Generate K1 and K2 |
| */ |
| if( ( ret = cmac_multiply_by_u( ctx->K1, L , block_size ) ) != 0 ) |
| goto exit; |
| if( ( ret = cmac_multiply_by_u( ctx->K2, ctx->K1 , block_size ) ) != 0 ) |
| goto exit; |
| |
| exit: |
| if( L != NULL ) |
| mbedtls_zeroize( L, sizeof( L ) ); |
| mbedtls_free( L ); |
| return( ret ); |
| } |
| |
| /* |
| * Set key and prepare context for use |
| */ |
| int mbedtls_cmac_setkey( mbedtls_cmac_context *ctx, |
| mbedtls_cipher_id_t cipher, |
| const unsigned char *key, |
| unsigned int keybits ) |
| { |
| int ret; |
| const mbedtls_cipher_info_t *cipher_info; |
| |
| cipher_info = mbedtls_cipher_info_from_values( cipher, keybits, |
| MBEDTLS_MODE_ECB ); |
| if( cipher_info == NULL ) |
| return( MBEDTLS_ERR_CMAC_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 ); |
| } |
| |
| ctx->K1 = mbedtls_calloc( cipher_info->block_size, sizeof( unsigned char ) ); |
| ctx->K2 = mbedtls_calloc( cipher_info->block_size, sizeof( unsigned char ) ); |
| |
| if( ctx->K1 == NULL || ctx->K2 == NULL ) |
| { |
| mbedtls_free(ctx->K1); |
| mbedtls_free(ctx->K2); |
| return( MBEDTLS_ERR_CMAC_ALLOC_FAILED ); |
| } |
| |
| return( cmac_generate_subkeys( ctx ) ); |
| } |
| |
| /* |
| * Free context |
| */ |
| void mbedtls_cmac_free( mbedtls_cmac_context *ctx ) |
| { |
| int block_size; |
| block_size = ctx->cipher_ctx.cipher_info->block_size; |
| mbedtls_cipher_free( &ctx->cipher_ctx ); |
| |
| if( ctx->K1 != NULL ) |
| mbedtls_zeroize( ctx->K1, block_size * sizeof( unsigned char ) ); |
| if( ctx->K2 != NULL ) |
| mbedtls_zeroize( ctx->K2, block_size * sizeof( unsigned char ) ); |
| mbedtls_free( ctx->K1 ); |
| mbedtls_free( ctx->K2 ); |
| } |
| |
| /* |
| * Create padded last block from (partial) last block. |
| * |
| * We can't use the padding option from the cipher layer, as it only works for |
| * CBC and we use ECB mode, and anyway we need to XOR K1 or K2 in addition. |
| */ |
| static void cmac_pad( unsigned char padded_block[16], |
| size_t padded_block_len, |
| const unsigned char *last_block, |
| size_t last_block_len ) |
| { |
| size_t j; |
| |
| for( j = 0; j < padded_block_len; j++ ) |
| { |
| if( j < last_block_len ) |
| padded_block[j] = last_block[j]; |
| else if( j == last_block_len ) |
| padded_block[j] = 0x80; |
| else |
| padded_block[j] = 0x00; |
| } |
| } |
| |
| /* |
| * XOR Block |
| * Here, macro results in smaller compiled code than static inline function |
| */ |
| #define XOR_BLOCK( o, i1, i2 ) \ |
| for( i = 0; i < block_size; i++ ) \ |
| ( o )[i] = ( i1 )[i] ^ ( i2 )[i]; |
| |
| /* |
| * Update the CMAC state using an input block |
| */ |
| #define UPDATE_CMAC( x ) \ |
| do { \ |
| XOR_BLOCK( state, ( x ), state ); \ |
| if( ( ret = mbedtls_cipher_update( &ctx->cipher_ctx, \ |
| state, block_size, \ |
| state, &olen ) ) != 0 ) \ |
| { \ |
| goto exit; \ |
| } \ |
| } while( 0 ) |
| |
| /* |
| * Generate tag on complete message |
| */ |
| int mbedtls_cmac_generate( mbedtls_cmac_context *ctx, |
| const unsigned char *input, size_t in_len, |
| unsigned char *tag, size_t tag_len ) |
| { |
| unsigned char *state; |
| unsigned char *M_last; |
| int n, j, ret, needs_padding; |
| size_t olen, block_size, i; |
| |
| ret = 0; |
| block_size = ctx->cipher_ctx.cipher_info->block_size; |
| |
| state = mbedtls_calloc( block_size, sizeof( unsigned char ) ); |
| M_last = mbedtls_calloc( block_size, sizeof( unsigned char ) ); |
| |
| if( state == NULL || M_last == NULL ) |
| { |
| ret = MBEDTLS_ERR_CMAC_ALLOC_FAILED; |
| goto exit; |
| } |
| |
| if( tag_len < 2 || tag_len > block_size || tag_len % 2 != 0 ) |
| { |
| ret = MBEDTLS_ERR_CMAC_BAD_INPUT; |
| goto exit; |
| } |
| |
| if( in_len == 0 ) |
| needs_padding = 1; |
| else |
| needs_padding = in_len % block_size != 0; |
| |
| n = in_len / block_size + needs_padding; |
| |
| /* Calculate last block */ |
| if( needs_padding ) |
| { |
| cmac_pad( M_last, block_size, input + block_size * ( n - 1 ), in_len % block_size ); |
| XOR_BLOCK( M_last, M_last, ctx->K2 ); |
| } |
| else |
| { |
| /* Last block is complete block */ |
| XOR_BLOCK( M_last, input + block_size * ( n - 1 ), ctx->K1 ); |
| } |
| |
| for( j = 0; j < n - 1; j++ ) |
| UPDATE_CMAC( input + block_size * j ); |
| |
| UPDATE_CMAC( M_last ); |
| |
| memcpy( tag, state, tag_len ); |
| |
| exit: |
| mbedtls_free( state ); |
| mbedtls_free( M_last ); |
| return( ret ); |
| } |
| |
| #undef XOR_BLOCK |
| #undef UPDATE_CMAC |
| |
| /* |
| * Verify tag on complete message |
| */ |
| int mbedtls_cmac_verify( mbedtls_cmac_context *ctx, |
| const unsigned char *input, size_t in_len, |
| const unsigned char *tag, size_t tag_len ) |
| { |
| int ret; |
| unsigned char *check_tag; |
| unsigned char i; |
| int diff; |
| |
| check_tag = mbedtls_calloc( ctx->cipher_ctx.cipher_info->block_size, |
| sizeof( unsigned char ) ); |
| if( check_tag == NULL ) |
| { |
| ret = MBEDTLS_ERR_CMAC_ALLOC_FAILED; |
| goto exit; |
| } |
| |
| if( ( ret = mbedtls_cmac_generate( ctx, input, in_len, |
| check_tag, tag_len ) ) != 0 ) |
| { |
| goto exit; |
| } |
| |
| /* Check tag in "constant-time" */ |
| for( diff = 0, i = 0; i < tag_len; i++ ) |
| diff |= tag[i] ^ check_tag[i]; |
| |
| if( diff != 0 ) |
| { |
| ret = MBEDTLS_ERR_CMAC_VERIFY_FAILED; |
| goto exit; |
| } |
| else |
| { |
| ret = 0; |
| goto exit; |
| } |
| |
| exit: |
| mbedtls_free( check_tag ); |
| return( ret ); |
| } |
| |
| #ifdef MBEDTLS_AES_C |
| /* |
| * PRF based on CMAC with AES-128 |
| * See RFC 4615 |
| */ |
| int mbedtls_aes_cmac_prf_128( const unsigned char *key, size_t key_length, |
| const unsigned char *input, size_t in_len, |
| unsigned char tag[16] ) |
| { |
| int ret; |
| mbedtls_cmac_context ctx; |
| unsigned char zero_key[16]; |
| unsigned char int_key[16]; |
| |
| mbedtls_cmac_init(&ctx ); |
| |
| if( key_length == 16 ) |
| { |
| /* Use key as is */ |
| memcpy( int_key, key, 16 ); |
| } |
| else |
| { |
| mbedtls_cmac_context zero_ctx; |
| |
| /* Key is AES_CMAC( 0, key ) */ |
| mbedtls_cmac_init( &zero_ctx ); |
| memset( zero_key, 0, 16 ); |
| ret = mbedtls_cmac_setkey( &zero_ctx, MBEDTLS_CIPHER_ID_AES, |
| zero_key, 8 * sizeof( zero_key ) ); |
| if( ret != 0 ) |
| goto exit; |
| |
| ret = mbedtls_cmac_generate( &zero_ctx, key, key_length, int_key, 16 ); |
| if( ret != 0 ) |
| goto exit; |
| } |
| |
| ret = mbedtls_cmac_setkey( &ctx, MBEDTLS_CIPHER_ID_AES, |
| int_key, 8 * sizeof( int_key ) ); |
| if( ret != 0 ) |
| goto exit; |
| |
| ret = mbedtls_cmac_generate( &ctx, input, in_len, tag, 16 ); |
| |
| exit: |
| mbedtls_zeroize( int_key, sizeof( int_key ) ); |
| mbedtls_cmac_free( &ctx ); |
| return( ret ); |
| } |
| #endif /* MBEDTLS_AES_C */ |
| |
| #ifdef MBEDTLS_SELF_TEST |
| /* |
| * CMAC test data from SP800-38B Appendix D.1 (corrected) |
| * http://csrc.nist.gov/publications/nistpubs/800-38B/Updated_CMAC_Examples.pdf |
| * |
| * AES-CMAC-PRF-128 test data from RFC 4615 |
| * https://tools.ietf.org/html/rfc4615#page-4 |
| */ |
| |
| #define NB_CMAC_TESTS_PER_KEY 4 |
| #define NB_PRF_TESTS 3 |
| #define AES_BLOCK_SIZE 16 |
| #define DES3_BLOCK_SIZE 8 |
| |
| #if defined(MBEDTLS_AES_C) || defined(MBEDTLS_DES_C) |
| /* All CMAC test inputs are truncated from the same 64 byte buffer. */ |
| static const unsigned char test_message[] = { |
| 0x6b, 0xc1, 0xbe, 0xe2, 0x2e, 0x40, 0x9f, 0x96, |
| 0xe9, 0x3d, 0x7e, 0x11, 0x73, 0x93, 0x17, 0x2a, |
| 0xae, 0x2d, 0x8a, 0x57, 0x1e, 0x03, 0xac, 0x9c, |
| 0x9e, 0xb7, 0x6f, 0xac, 0x45, 0xaf, 0x8e, 0x51, |
| 0x30, 0xc8, 0x1c, 0x46, 0xa3, 0x5c, 0xe4, 0x11, |
| 0xe5, 0xfb, 0xc1, 0x19, 0x1a, 0x0a, 0x52, 0xef, |
| 0xf6, 0x9f, 0x24, 0x45, 0xdf, 0x4f, 0x9b, 0x17, |
| 0xad, 0x2b, 0x41, 0x7b, 0xe6, 0x6c, 0x37, 0x10 |
| }; |
| |
| |
| #endif /* defined(MBEDTLS_AES_C) || defined(MBEDTLS_DES_C) */ |
| |
| #ifdef MBEDTLS_AES_C |
| /* Truncation point of message for AES CMAC tests */ |
| static const unsigned int aes_message_lengths[NB_CMAC_TESTS_PER_KEY] = { |
| 0, |
| 16, |
| 40, |
| 64 |
| }; |
| |
| /* AES 128 CMAC Test Data */ |
| static const unsigned char aes_128_key[16] = { |
| 0x2b, 0x7e, 0x15, 0x16, 0x28, 0xae, 0xd2, 0xa6, |
| 0xab, 0xf7, 0x15, 0x88, 0x09, 0xcf, 0x4f, 0x3c |
| }; |
| static const unsigned char aes_128_subkeys[2][AES_BLOCK_SIZE] = { |
| { |
| 0xfb, 0xee, 0xd6, 0x18, 0x35, 0x71, 0x33, 0x66, |
| 0x7c, 0x85, 0xe0, 0x8f, 0x72, 0x36, 0xa8, 0xde |
| }, |
| { |
| 0xf7, 0xdd, 0xac, 0x30, 0x6a, 0xe2, 0x66, 0xcc, |
| 0xf9, 0x0b, 0xc1, 0x1e, 0xe4, 0x6d, 0x51, 0x3b |
| } |
| }; |
| static const unsigned char aes_128_expected_result[NB_CMAC_TESTS_PER_KEY][AES_BLOCK_SIZE] = { |
| { |
| 0xbb, 0x1d, 0x69, 0x29, 0xe9, 0x59, 0x37, 0x28, |
| 0x7f, 0xa3, 0x7d, 0x12, 0x9b, 0x75, 0x67, 0x46 |
| }, |
| { |
| 0x07, 0x0a, 0x16, 0xb4, 0x6b, 0x4d, 0x41, 0x44, |
| 0xf7, 0x9b, 0xdd, 0x9d, 0xd0, 0x4a, 0x28, 0x7c |
| }, |
| { |
| 0xdf, 0xa6, 0x67, 0x47, 0xde, 0x9a, 0xe6, 0x30, |
| 0x30, 0xca, 0x32, 0x61, 0x14, 0x97, 0xc8, 0x27 |
| }, |
| { |
| 0x51, 0xf0, 0xbe, 0xbf, 0x7e, 0x3b, 0x9d, 0x92, |
| 0xfc, 0x49, 0x74, 0x17, 0x79, 0x36, 0x3c, 0xfe |
| } |
| }; |
| |
| /* AES 192 CMAC Test Data */ |
| static const unsigned char aes_192_key[24] = { |
| 0x8e, 0x73, 0xb0, 0xf7, 0xda, 0x0e, 0x64, 0x52, |
| 0xc8, 0x10, 0xf3, 0x2b, 0x80, 0x90, 0x79, 0xe5, |
| 0x62, 0xf8, 0xea, 0xd2, 0x52, 0x2c, 0x6b, 0x7b |
| }; |
| static const unsigned char aes_192_subkeys[2][AES_BLOCK_SIZE] = { |
| { |
| 0x44, 0x8a, 0x5b, 0x1c, 0x93, 0x51, 0x4b, 0x27, |
| 0x3e, 0xe6, 0x43, 0x9d, 0xd4, 0xda, 0xa2, 0x96 |
| }, |
| { |
| 0x89, 0x14, 0xb6, 0x39, 0x26, 0xa2, 0x96, 0x4e, |
| 0x7d, 0xcc, 0x87, 0x3b, 0xa9, 0xb5, 0x45, 0x2c |
| } |
| }; |
| static const unsigned char aes_192_expected_result[NB_CMAC_TESTS_PER_KEY][AES_BLOCK_SIZE] = { |
| { |
| 0xd1, 0x7d, 0xdf, 0x46, 0xad, 0xaa, 0xcd, 0xe5, |
| 0x31, 0xca, 0xc4, 0x83, 0xde, 0x7a, 0x93, 0x67 |
| }, |
| { |
| 0x9e, 0x99, 0xa7, 0xbf, 0x31, 0xe7, 0x10, 0x90, |
| 0x06, 0x62, 0xf6, 0x5e, 0x61, 0x7c, 0x51, 0x84 |
| }, |
| { |
| 0x8a, 0x1d, 0xe5, 0xbe, 0x2e, 0xb3, 0x1a, 0xad, |
| 0x08, 0x9a, 0x82, 0xe6, 0xee, 0x90, 0x8b, 0x0e |
| }, |
| { |
| 0xa1, 0xd5, 0xdf, 0x0e, 0xed, 0x79, 0x0f, 0x79, |
| 0x4d, 0x77, 0x58, 0x96, 0x59, 0xf3, 0x9a, 0x11 |
| } |
| }; |
| |
| /* AES 256 CMAC Test Data */ |
| static const unsigned char aes_256_key[32] = { |
| 0x60, 0x3d, 0xeb, 0x10, 0x15, 0xca, 0x71, 0xbe, |
| 0x2b, 0x73, 0xae, 0xf0, 0x85, 0x7d, 0x77, 0x81, |
| 0x1f, 0x35, 0x2c, 0x07, 0x3b, 0x61, 0x08, 0xd7, |
| 0x2d, 0x98, 0x10, 0xa3, 0x09, 0x14, 0xdf, 0xf4 |
| }; |
| static const unsigned char aes_256_subkeys[2][AES_BLOCK_SIZE] = { |
| { |
| 0xca, 0xd1, 0xed, 0x03, 0x29, 0x9e, 0xed, 0xac, |
| 0x2e, 0x9a, 0x99, 0x80, 0x86, 0x21, 0x50, 0x2f |
| }, |
| { |
| 0x95, 0xa3, 0xda, 0x06, 0x53, 0x3d, 0xdb, 0x58, |
| 0x5d, 0x35, 0x33, 0x01, 0x0c, 0x42, 0xa0, 0xd9 |
| } |
| }; |
| static const unsigned char aes_256_expected_result[NB_CMAC_TESTS_PER_KEY][AES_BLOCK_SIZE] = { |
| { |
| 0x02, 0x89, 0x62, 0xf6, 0x1b, 0x7b, 0xf8, 0x9e, |
| 0xfc, 0x6b, 0x55, 0x1f, 0x46, 0x67, 0xd9, 0x83 |
| }, |
| { |
| 0x28, 0xa7, 0x02, 0x3f, 0x45, 0x2e, 0x8f, 0x82, |
| 0xbd, 0x4b, 0xf2, 0x8d, 0x8c, 0x37, 0xc3, 0x5c |
| }, |
| { |
| 0xaa, 0xf3, 0xd8, 0xf1, 0xde, 0x56, 0x40, 0xc2, |
| 0x32, 0xf5, 0xb1, 0x69, 0xb9, 0xc9, 0x11, 0xe6 |
| }, |
| { |
| 0xe1, 0x99, 0x21, 0x90, 0x54, 0x9f, 0x6e, 0xd5, |
| 0x69, 0x6a, 0x2c, 0x05, 0x6c, 0x31, 0x54, 0x10 |
| } |
| }; |
| #endif /* MBEDTLS_AES_C */ |
| |
| #ifdef MBEDTLS_DES_C |
| /* Truncation point of message for 3DES CMAC tests */ |
| static const unsigned int des3_message_lengths[NB_CMAC_TESTS_PER_KEY] = { |
| 0, |
| 8, |
| 20, |
| 32 |
| }; |
| |
| /* 3DES 2 Key CMAC Test Data */ |
| static const unsigned char des3_2key_key[24] = { |
| 0x4c, 0xf1, 0x51, 0x34, 0xa2, 0x85, 0x0d, 0xd5, |
| 0x8a, 0x3d, 0x10, 0xba, 0x80, 0x57, 0x0d, 0x38, |
| 0x4c, 0xf1, 0x51, 0x34, 0xa2, 0x85, 0x0d, 0xd5 |
| }; |
| static const unsigned char des3_2key_subkeys[2][8] = { |
| { |
| 0x8e, 0xcf, 0x37, 0x3e, 0xd7, 0x1a, 0xfa, 0xef |
| }, |
| { |
| 0x1d, 0x9e, 0x6e, 0x7d, 0xae, 0x35, 0xf5, 0xc5 |
| } |
| }; |
| static const unsigned char des3_2key_expected_result[NB_CMAC_TESTS_PER_KEY][DES3_BLOCK_SIZE] = { |
| { |
| 0xbd, 0x2e, 0xbf, 0x9a, 0x3b, 0xa0, 0x03, 0x61 |
| }, |
| { |
| 0x4f, 0xf2, 0xab, 0x81, 0x3c, 0x53, 0xce, 0x83 |
| }, |
| { |
| 0x62, 0xdd, 0x1b, 0x47, 0x19, 0x02, 0xbd, 0x4e |
| }, |
| { |
| 0x31, 0xb1, 0xe4, 0x31, 0xda, 0xbc, 0x4e, 0xb8 |
| } |
| }; |
| |
| /* 3DES 3 Key CMAC Test Data */ |
| static const unsigned char des3_3key_key[24] = { |
| 0x8a, 0xa8, 0x3b, 0xf8, 0xcb, 0xda, 0x10, 0x62, |
| 0x0b, 0xc1, 0xbf, 0x19, 0xfb, 0xb6, 0xcd, 0x58, |
| 0xbc, 0x31, 0x3d, 0x4a, 0x37, 0x1c, 0xa8, 0xb5 |
| }; |
| static const unsigned char des3_3key_subkeys[2][8] = { |
| { |
| 0x91, 0x98, 0xe9, 0xd3, 0x14, 0xe6, 0x53, 0x5f |
| }, |
| { |
| 0x23, 0x31, 0xd3, 0xa6, 0x29, 0xcc, 0xa6, 0xa5 |
| } |
| }; |
| static const unsigned char des3_3key_expected_result[NB_CMAC_TESTS_PER_KEY][DES3_BLOCK_SIZE] = { |
| { |
| 0xb7, 0xa6, 0x88, 0xe1, 0x22, 0xff, 0xaf, 0x95 |
| }, |
| { |
| 0x8e, 0x8f, 0x29, 0x31, 0x36, 0x28, 0x37, 0x97 |
| }, |
| { |
| 0x74, 0x3d, 0xdb, 0xe0, 0xce, 0x2d, 0xc2, 0xed |
| }, |
| { |
| 0x33, 0xe6, 0xb1, 0x09, 0x24, 0x00, 0xea, 0xe5 |
| } |
| }; |
| |
| #endif /* MBEDTLS_DES_C */ |
| |
| #ifdef MBEDTLS_AES_C |
| /* AES AES-CMAC-PRF-128 Test Data */ |
| static const unsigned char PRFK[] = { |
| 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, |
| 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, |
| 0xed, 0xcb |
| }; |
| |
| /* Sizes in bytes */ |
| static const size_t PRFKlen[NB_PRF_TESTS] = { |
| 18, |
| 16, |
| 10 |
| }; |
| |
| /* PRF M */ |
| static const unsigned char PRFM[] = { |
| 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, |
| 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, |
| 0x10, 0x11, 0x12, 0x13 |
| }; |
| |
| static const unsigned char PRFT[NB_PRF_TESTS][16] = { |
| { |
| 0x84, 0xa3, 0x48, 0xa4, 0xa4, 0x5d, 0x23, 0x5b, |
| 0xab, 0xff, 0xfc, 0x0d, 0x2b, 0x4d, 0xa0, 0x9a |
| }, |
| { |
| 0x98, 0x0a, 0xe8, 0x7b, 0x5f, 0x4c, 0x9c, 0x52, |
| 0x14, 0xf5, 0xb6, 0xa8, 0x45, 0x5e, 0x4c, 0x2d |
| }, |
| { |
| 0x29, 0x0d, 0x9e, 0x11, 0x2e, 0xdb, 0x09, 0xee, |
| 0x14, 0x1f, 0xcf, 0x64, 0xc0, 0xb7, 0x2f, 0x3d |
| } |
| }; |
| #endif /* MBEDTLS_AES_C */ |
| |
| static inline int cmac_test_wth_cipher( int verbose, |
| const char* testname, |
| const unsigned char* key, |
| int keybits, |
| const unsigned char* messages, |
| const unsigned int message_lengths[4], |
| const unsigned char* subkeys, |
| const unsigned char* expected_result, |
| mbedtls_cipher_id_t cipher_id, |
| int block_size ) |
| { |
| const int num_tests = 4; |
| mbedtls_cmac_context ctx; |
| int i, ret; |
| unsigned char* tag; |
| |
| tag = mbedtls_calloc( block_size, sizeof( unsigned char ) ); |
| if( tag == NULL ) |
| { |
| ret = MBEDTLS_ERR_CMAC_ALLOC_FAILED; |
| goto exit; |
| } |
| |
| mbedtls_cmac_init( &ctx ); |
| |
| if( ( ret = mbedtls_cmac_setkey( &ctx, cipher_id, key, keybits ) ) != 0 ) |
| { |
| if( verbose != 0 ) |
| mbedtls_printf( " CMAC: setup failed\n" ); |
| goto exit; |
| } |
| |
| if( ( ret = memcmp( ctx.K1, subkeys, block_size ) != 0 ) || |
| ( ret = memcmp( ctx.K2, &subkeys[block_size], block_size ) != 0 ) ) |
| { |
| if( verbose != 0 ) |
| mbedtls_printf( " CMAC: subkey generation failed\n" ); |
| goto exit; |
| } |
| |
| for( i = 0; i < num_tests; i++ ) |
| { |
| if( verbose != 0 ) |
| mbedtls_printf( " %s CMAC #%u: ", testname, i +1 ); |
| |
| if( ( ret = mbedtls_cmac_generate( &ctx, messages, message_lengths[i], tag, block_size ) ) != 0 ) |
| { |
| if( verbose != 0 ) |
| mbedtls_printf( "failed\n" ); |
| goto exit; |
| } |
| |
| if( ( ret = memcmp( tag, &expected_result[i * block_size], block_size ) ) != 0 ) |
| { |
| if( verbose != 0 ) |
| mbedtls_printf( "failed\n" ); |
| goto exit; |
| } |
| |
| if( ( ret = mbedtls_cmac_verify( &ctx, messages, message_lengths[i], &expected_result[i * block_size], block_size ) != 0 ) ) |
| { |
| if( verbose != 0 ) |
| mbedtls_printf( "failed\n" ); |
| goto exit; |
| } |
| |
| if( verbose != 0 ) |
| mbedtls_printf( "passed\n" ); |
| } |
| exit: |
| mbedtls_free( tag ); |
| mbedtls_cmac_free( &ctx ); |
| return( ret ); |
| } |
| |
| #ifdef MBEDTLS_AES_C |
| static inline int test_aes128_cmac_prf( int verbose ) |
| { |
| int i; |
| int ret; |
| unsigned char tag[16]; |
| for( i = 0; i < NB_PRF_TESTS; i++ ) |
| { |
| mbedtls_printf( " AES CMAC 128 PRF #%u: ", i ); |
| ret = mbedtls_aes_cmac_prf_128( PRFK, PRFKlen[i], PRFM, 20, tag ); |
| if( ret != 0 || |
| memcmp( tag, PRFT[i], 16 ) != 0 ) |
| { |
| if( verbose != 0 ) |
| mbedtls_printf( "failed\n" ); |
| |
| return( ret ); |
| } else if( verbose != 0 ) |
| { |
| mbedtls_printf( "passed\n" ); |
| } |
| } |
| return( ret ); |
| } |
| #endif /* MBEDTLS_AES_C */ |
| |
| int mbedtls_cmac_self_test( int verbose ) |
| { |
| int ret; |
| |
| #ifdef MBEDTLS_AES_C |
| if( ( ret = cmac_test_wth_cipher( verbose, |
| "AES 128", |
| aes_128_key, |
| 128, |
| test_message, |
| aes_message_lengths, |
| (const unsigned char*) aes_128_subkeys, |
| (const unsigned char*) aes_128_expected_result, |
| MBEDTLS_CIPHER_ID_AES, |
| AES_BLOCK_SIZE ) !=0 ) ) |
| { |
| return( ret ); |
| } |
| |
| if( ( ret = cmac_test_wth_cipher( verbose, |
| "AES 192", |
| aes_192_key, |
| 192, |
| test_message, |
| aes_message_lengths, |
| (const unsigned char*) aes_192_subkeys, |
| (const unsigned char*) aes_192_expected_result, |
| MBEDTLS_CIPHER_ID_AES, |
| AES_BLOCK_SIZE ) !=0 ) ) |
| { |
| return( ret ); |
| } |
| |
| if( ( ret = cmac_test_wth_cipher ( verbose, |
| "AES 256", |
| aes_256_key, |
| 256, |
| test_message, |
| aes_message_lengths, |
| (const unsigned char*) aes_256_subkeys, |
| (const unsigned char*) aes_256_expected_result, |
| MBEDTLS_CIPHER_ID_AES, |
| AES_BLOCK_SIZE ) !=0 ) ) |
| { |
| return( ret ); |
| } |
| #endif /* MBEDTLS_AES_C */ |
| |
| #ifdef MBEDTLS_DES_C |
| if( ( ret = cmac_test_wth_cipher( verbose, |
| "3DES 2 key", |
| des3_2key_key, |
| 192, |
| test_message, |
| des3_message_lengths, |
| (const unsigned char*) des3_2key_subkeys, |
| (const unsigned char*) des3_2key_expected_result, |
| MBEDTLS_CIPHER_ID_3DES, |
| DES3_BLOCK_SIZE ) !=0 ) ) |
| { |
| return( ret ); |
| } |
| |
| if( ( ret = cmac_test_wth_cipher( verbose, |
| "3DES 3 key", |
| des3_3key_key, |
| 192, |
| test_message, |
| des3_message_lengths, |
| (const unsigned char*) des3_3key_subkeys, |
| (const unsigned char*) des3_3key_expected_result, |
| MBEDTLS_CIPHER_ID_3DES, |
| DES3_BLOCK_SIZE ) !=0 ) ) |
| { |
| return( ret ); |
| } |
| #endif /* MBEDTLS_DES_C */ |
| |
| #ifdef MBEDTLS_AES_C |
| if( ( ret = test_aes128_cmac_prf( verbose ) != 0 ) ) |
| return( ret ); |
| #endif /* MBEDTLS_AES_C */ |
| |
| if( verbose != 0 ) |
| mbedtls_printf( "\n" ); |
| |
| return( 0 ); |
| } |
| |
| #endif /* MBEDTLS_SELF_TEST */ |
| |
| #endif /* MBEDTLS_CMAC_C */ |
