| /** |
| * \file cmac.c |
| * |
| * \brief NIST SP800-38B compliant CMAC implementation for AES and 3DES |
| * |
| * 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. |
| */ |
| |
| /* |
| * References: |
| * |
| * - NIST SP 800-38B Recommendation for Block Cipher Modes of Operation: The |
| * CMAC Mode for Authentication |
| * http://nvlpubs.nist.gov/nistpubs/SpecialPublications/NIST.SP.800-38b.pdf |
| * |
| * - RFC 4493 - The AES-CMAC Algorithm |
| * https://tools.ietf.org/html/rfc4493 |
| * |
| * - RFC 4615 - The Advanced Encryption Standard-Cipher-based Message |
| * Authentication Code-Pseudo-Random Function-128 (AES-CMAC-PRF-128) |
| * Algorithm for the Internet Key Exchange Protocol (IKE) |
| * https://tools.ietf.org/html/rfc4615 |
| * |
| * Additional test vectors: ISO/IEC 9797-1 |
| * |
| */ |
| |
| #include "common.h" |
| |
| #if defined(MBEDTLS_CMAC_C) |
| |
| # include "mbedtls/cmac.h" |
| # include "mbedtls/platform_util.h" |
| # include "mbedtls/error.h" |
| # include "mbedtls/platform.h" |
| |
| # include <string.h> |
| |
| # if !defined(MBEDTLS_CMAC_ALT) || defined(MBEDTLS_SELF_TEST) |
| |
| /* |
| * 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 bytes or 16 bytes - the block sizes for DES and AES. |
| */ |
| 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; |
| |
| if (blocksize == MBEDTLS_AES_BLOCK_SIZE) { |
| R_n = R_128; |
| } else if (blocksize == MBEDTLS_DES3_BLOCK_SIZE) { |
| R_n = R_64; |
| } else { |
| return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA; |
| } |
| |
| for (i = (int)blocksize - 1; 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[blocksize - 1] ^= R_n & mask; |
| |
| return 0; |
| } |
| |
| /* |
| * Generate subkeys |
| * |
| * - as specified by RFC 4493, section 2.3 Subkey Generation Algorithm |
| */ |
| static int cmac_generate_subkeys(mbedtls_cipher_context_t *ctx, |
| unsigned char *K1, |
| unsigned char *K2) |
| { |
| int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
| unsigned char L[MBEDTLS_CIPHER_BLKSIZE_MAX]; |
| size_t olen, block_size; |
| |
| mbedtls_platform_zeroize(L, sizeof(L)); |
| |
| block_size = ctx->cipher_info->block_size; |
| |
| /* Calculate Ek(0) */ |
| if ((ret = mbedtls_cipher_update(ctx, L, block_size, L, &olen)) != 0) |
| goto exit; |
| |
| /* |
| * Generate K1 and K2 |
| */ |
| if ((ret = cmac_multiply_by_u(K1, L, block_size)) != 0) |
| goto exit; |
| |
| if ((ret = cmac_multiply_by_u(K2, K1, block_size)) != 0) |
| goto exit; |
| |
| exit: |
| mbedtls_platform_zeroize(L, sizeof(L)); |
| |
| return ret; |
| } |
| # endif /* !defined(MBEDTLS_CMAC_ALT) || defined(MBEDTLS_SELF_TEST) */ |
| |
| # if !defined(MBEDTLS_CMAC_ALT) |
| static void cmac_xor_block(unsigned char *output, |
| const unsigned char *input1, |
| const unsigned char *input2, |
| const size_t block_size) |
| { |
| size_t idx; |
| |
| for (idx = 0; idx < block_size; idx++) |
| output[idx] = input1[idx] ^ input2[idx]; |
| } |
| |
| /* |
| * 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[MBEDTLS_CIPHER_BLKSIZE_MAX], |
| 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; |
| } |
| } |
| |
| int mbedtls_cipher_cmac_starts(mbedtls_cipher_context_t *ctx, |
| const unsigned char *key, |
| size_t keybits) |
| { |
| mbedtls_cipher_type_t type; |
| mbedtls_cmac_context_t *cmac_ctx; |
| int retval; |
| |
| if (ctx == NULL || ctx->cipher_info == NULL || key == NULL) |
| return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA; |
| |
| if ((retval = mbedtls_cipher_setkey(ctx, key, (int)keybits, |
| MBEDTLS_ENCRYPT)) != 0) |
| return retval; |
| |
| type = ctx->cipher_info->type; |
| |
| switch (type) { |
| case MBEDTLS_CIPHER_AES_128_ECB: |
| case MBEDTLS_CIPHER_AES_192_ECB: |
| case MBEDTLS_CIPHER_AES_256_ECB: |
| case MBEDTLS_CIPHER_DES_EDE3_ECB: |
| break; |
| default: |
| return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA; |
| } |
| |
| /* Allocated and initialise in the cipher context memory for the CMAC |
| * context */ |
| cmac_ctx = mbedtls_calloc(1, sizeof(mbedtls_cmac_context_t)); |
| if (cmac_ctx == NULL) |
| return MBEDTLS_ERR_CIPHER_ALLOC_FAILED; |
| |
| ctx->cmac_ctx = cmac_ctx; |
| |
| mbedtls_platform_zeroize(cmac_ctx->state, sizeof(cmac_ctx->state)); |
| |
| return 0; |
| } |
| |
| int mbedtls_cipher_cmac_update(mbedtls_cipher_context_t *ctx, |
| const unsigned char *input, |
| size_t ilen) |
| { |
| mbedtls_cmac_context_t *cmac_ctx; |
| unsigned char *state; |
| int ret = 0; |
| size_t n, j, olen, block_size; |
| |
| if (ctx == NULL || ctx->cipher_info == NULL || input == NULL || |
| ctx->cmac_ctx == NULL) |
| return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA; |
| |
| cmac_ctx = ctx->cmac_ctx; |
| block_size = ctx->cipher_info->block_size; |
| state = ctx->cmac_ctx->state; |
| |
| /* Is there data still to process from the last call, that's greater in |
| * size than a block? */ |
| if (cmac_ctx->unprocessed_len > 0 && |
| ilen > block_size - cmac_ctx->unprocessed_len) { |
| memcpy(&cmac_ctx->unprocessed_block[cmac_ctx->unprocessed_len], input, |
| block_size - cmac_ctx->unprocessed_len); |
| |
| cmac_xor_block(state, cmac_ctx->unprocessed_block, state, block_size); |
| |
| if ((ret = mbedtls_cipher_update(ctx, state, block_size, state, |
| &olen)) != 0) { |
| goto exit; |
| } |
| |
| input += block_size - cmac_ctx->unprocessed_len; |
| ilen -= block_size - cmac_ctx->unprocessed_len; |
| cmac_ctx->unprocessed_len = 0; |
| } |
| |
| /* n is the number of blocks including any final partial block */ |
| n = (ilen + block_size - 1) / block_size; |
| |
| /* Iterate across the input data in block sized chunks, excluding any |
| * final partial or complete block */ |
| for (j = 1; j < n; j++) { |
| cmac_xor_block(state, input, state, block_size); |
| |
| if ((ret = mbedtls_cipher_update(ctx, state, block_size, state, |
| &olen)) != 0) |
| goto exit; |
| |
| ilen -= block_size; |
| input += block_size; |
| } |
| |
| /* If there is data left over that wasn't aligned to a block */ |
| if (ilen > 0) { |
| memcpy(&cmac_ctx->unprocessed_block[cmac_ctx->unprocessed_len], input, |
| ilen); |
| cmac_ctx->unprocessed_len += ilen; |
| } |
| |
| exit: |
| return ret; |
| } |
| |
| int mbedtls_cipher_cmac_finish(mbedtls_cipher_context_t *ctx, |
| unsigned char *output) |
| { |
| mbedtls_cmac_context_t *cmac_ctx; |
| unsigned char *state, *last_block; |
| unsigned char K1[MBEDTLS_CIPHER_BLKSIZE_MAX]; |
| unsigned char K2[MBEDTLS_CIPHER_BLKSIZE_MAX]; |
| unsigned char M_last[MBEDTLS_CIPHER_BLKSIZE_MAX]; |
| int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
| size_t olen, block_size; |
| |
| if (ctx == NULL || ctx->cipher_info == NULL || ctx->cmac_ctx == NULL || |
| output == NULL) |
| return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA; |
| |
| cmac_ctx = ctx->cmac_ctx; |
| block_size = ctx->cipher_info->block_size; |
| state = cmac_ctx->state; |
| |
| mbedtls_platform_zeroize(K1, sizeof(K1)); |
| mbedtls_platform_zeroize(K2, sizeof(K2)); |
| cmac_generate_subkeys(ctx, K1, K2); |
| |
| last_block = cmac_ctx->unprocessed_block; |
| |
| /* Calculate last block */ |
| if (cmac_ctx->unprocessed_len < block_size) { |
| cmac_pad(M_last, block_size, last_block, cmac_ctx->unprocessed_len); |
| cmac_xor_block(M_last, M_last, K2, block_size); |
| } else { |
| /* Last block is complete block */ |
| cmac_xor_block(M_last, last_block, K1, block_size); |
| } |
| |
| cmac_xor_block(state, M_last, state, block_size); |
| if ((ret = mbedtls_cipher_update(ctx, state, block_size, state, &olen)) != |
| 0) { |
| goto exit; |
| } |
| |
| memcpy(output, state, block_size); |
| |
| exit: |
| /* Wipe the generated keys on the stack, and any other transients to avoid |
| * side channel leakage */ |
| mbedtls_platform_zeroize(K1, sizeof(K1)); |
| mbedtls_platform_zeroize(K2, sizeof(K2)); |
| |
| cmac_ctx->unprocessed_len = 0; |
| mbedtls_platform_zeroize(cmac_ctx->unprocessed_block, |
| sizeof(cmac_ctx->unprocessed_block)); |
| |
| mbedtls_platform_zeroize(state, MBEDTLS_CIPHER_BLKSIZE_MAX); |
| return ret; |
| } |
| |
| int mbedtls_cipher_cmac_reset(mbedtls_cipher_context_t *ctx) |
| { |
| mbedtls_cmac_context_t *cmac_ctx; |
| |
| if (ctx == NULL || ctx->cipher_info == NULL || ctx->cmac_ctx == NULL) |
| return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA; |
| |
| cmac_ctx = ctx->cmac_ctx; |
| |
| /* Reset the internal state */ |
| cmac_ctx->unprocessed_len = 0; |
| mbedtls_platform_zeroize(cmac_ctx->unprocessed_block, |
| sizeof(cmac_ctx->unprocessed_block)); |
| mbedtls_platform_zeroize(cmac_ctx->state, sizeof(cmac_ctx->state)); |
| |
| return 0; |
| } |
| |
| int mbedtls_cipher_cmac(const mbedtls_cipher_info_t *cipher_info, |
| const unsigned char *key, |
| size_t keylen, |
| const unsigned char *input, |
| size_t ilen, |
| unsigned char *output) |
| { |
| mbedtls_cipher_context_t ctx; |
| int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
| |
| if (cipher_info == NULL || key == NULL || input == NULL || output == NULL) |
| return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA; |
| |
| mbedtls_cipher_init(&ctx); |
| |
| if ((ret = mbedtls_cipher_setup(&ctx, cipher_info)) != 0) |
| goto exit; |
| |
| ret = mbedtls_cipher_cmac_starts(&ctx, key, keylen); |
| if (ret != 0) |
| goto exit; |
| |
| ret = mbedtls_cipher_cmac_update(&ctx, input, ilen); |
| if (ret != 0) |
| goto exit; |
| |
| ret = mbedtls_cipher_cmac_finish(&ctx, output); |
| |
| exit: |
| mbedtls_cipher_free(&ctx); |
| |
| return ret; |
| } |
| |
| # if defined(MBEDTLS_AES_C) |
| /* |
| * Implementation of AES-CMAC-PRF-128 defined in 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 output[16]) |
| { |
| int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
| const mbedtls_cipher_info_t *cipher_info; |
| unsigned char zero_key[MBEDTLS_AES_BLOCK_SIZE]; |
| unsigned char int_key[MBEDTLS_AES_BLOCK_SIZE]; |
| |
| if (key == NULL || input == NULL || output == NULL) |
| return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA; |
| |
| cipher_info = mbedtls_cipher_info_from_type(MBEDTLS_CIPHER_AES_128_ECB); |
| if (cipher_info == NULL) { |
| /* Failing at this point must be due to a build issue */ |
| ret = MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE; |
| goto exit; |
| } |
| |
| if (key_length == MBEDTLS_AES_BLOCK_SIZE) { |
| /* Use key as is */ |
| memcpy(int_key, key, MBEDTLS_AES_BLOCK_SIZE); |
| } else { |
| memset(zero_key, 0, MBEDTLS_AES_BLOCK_SIZE); |
| |
| ret = mbedtls_cipher_cmac(cipher_info, zero_key, 128, key, key_length, |
| int_key); |
| if (ret != 0) |
| goto exit; |
| } |
| |
| ret = mbedtls_cipher_cmac(cipher_info, int_key, 128, input, in_len, output); |
| |
| exit: |
| mbedtls_platform_zeroize(int_key, sizeof(int_key)); |
| |
| return ret; |
| } |
| # endif /* MBEDTLS_AES_C */ |
| |
| # endif /* !MBEDTLS_CMAC_ALT */ |
| |
| # if defined(MBEDTLS_SELF_TEST) |
| /* |
| * CMAC test data for SP800-38B |
| * http://csrc.nist.gov/groups/ST/toolkit/documents/Examples/AES_CMAC.pdf |
| * http://csrc.nist.gov/groups/ST/toolkit/documents/Examples/TDES_CMAC.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 |
| |
| # 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[] = { |
| /* PT */ |
| 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 /* MBEDTLS_AES_C || MBEDTLS_DES_C */ |
| |
| # if defined(MBEDTLS_AES_C) |
| /* Truncation point of message for AES CMAC tests */ |
| static const unsigned int aes_message_lengths[NB_CMAC_TESTS_PER_KEY] = { |
| /* Mlen */ |
| 0, 16, 20, 64 |
| }; |
| |
| /* CMAC-AES128 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][MBEDTLS_AES_BLOCK_SIZE] = { |
| { /* K1 */ |
| 0xfb, 0xee, 0xd6, 0x18, 0x35, 0x71, 0x33, 0x66, 0x7c, 0x85, 0xe0, 0x8f, |
| 0x72, 0x36, 0xa8, 0xde }, |
| { /* K2 */ |
| 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][MBEDTLS_AES_BLOCK_SIZE] = { |
| { /* Example #1 */ |
| 0xbb, 0x1d, 0x69, 0x29, 0xe9, 0x59, 0x37, 0x28, 0x7f, 0xa3, 0x7d, |
| 0x12, 0x9b, 0x75, 0x67, 0x46 }, |
| { /* Example #2 */ |
| 0x07, 0x0a, 0x16, 0xb4, 0x6b, 0x4d, 0x41, 0x44, 0xf7, 0x9b, 0xdd, |
| 0x9d, 0xd0, 0x4a, 0x28, 0x7c }, |
| { /* Example #3 */ |
| 0x7d, 0x85, 0x44, 0x9e, 0xa6, 0xea, 0x19, 0xc8, 0x23, 0xa7, 0xbf, |
| 0x78, 0x83, 0x7d, 0xfa, 0xde }, |
| { /* Example #4 */ |
| 0x51, 0xf0, 0xbe, 0xbf, 0x7e, 0x3b, 0x9d, 0x92, 0xfc, 0x49, 0x74, |
| 0x17, 0x79, 0x36, 0x3c, 0xfe } |
| }; |
| |
| /* CMAC-AES192 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][MBEDTLS_AES_BLOCK_SIZE] = { |
| { /* K1 */ |
| 0x44, 0x8a, 0x5b, 0x1c, 0x93, 0x51, 0x4b, 0x27, 0x3e, 0xe6, 0x43, 0x9d, |
| 0xd4, 0xda, 0xa2, 0x96 }, |
| { /* K2 */ |
| 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][MBEDTLS_AES_BLOCK_SIZE] = { |
| { /* Example #1 */ |
| 0xd1, 0x7d, 0xdf, 0x46, 0xad, 0xaa, 0xcd, 0xe5, 0x31, 0xca, 0xc4, |
| 0x83, 0xde, 0x7a, 0x93, 0x67 }, |
| { /* Example #2 */ |
| 0x9e, 0x99, 0xa7, 0xbf, 0x31, 0xe7, 0x10, 0x90, 0x06, 0x62, 0xf6, |
| 0x5e, 0x61, 0x7c, 0x51, 0x84 }, |
| { /* Example #3 */ |
| 0x3d, 0x75, 0xc1, 0x94, 0xed, 0x96, 0x07, 0x04, 0x44, 0xa9, 0xfa, |
| 0x7e, 0xc7, 0x40, 0xec, 0xf8 }, |
| { /* Example #4 */ |
| 0xa1, 0xd5, 0xdf, 0x0e, 0xed, 0x79, 0x0f, 0x79, 0x4d, 0x77, 0x58, |
| 0x96, 0x59, 0xf3, 0x9a, 0x11 } |
| }; |
| |
| /* CMAC-AES256 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][MBEDTLS_AES_BLOCK_SIZE] = { |
| { /* K1 */ |
| 0xca, 0xd1, 0xed, 0x03, 0x29, 0x9e, 0xed, 0xac, 0x2e, 0x9a, 0x99, 0x80, |
| 0x86, 0x21, 0x50, 0x2f }, |
| { /* K2 */ |
| 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][MBEDTLS_AES_BLOCK_SIZE] = { |
| { /* Example #1 */ |
| 0x02, 0x89, 0x62, 0xf6, 0x1b, 0x7b, 0xf8, 0x9e, 0xfc, 0x6b, 0x55, |
| 0x1f, 0x46, 0x67, 0xd9, 0x83 }, |
| { /* Example #2 */ |
| 0x28, 0xa7, 0x02, 0x3f, 0x45, 0x2e, 0x8f, 0x82, 0xbd, 0x4b, 0xf2, |
| 0x8d, 0x8c, 0x37, 0xc3, 0x5c }, |
| { /* Example #3 */ |
| 0x15, 0x67, 0x27, 0xdc, 0x08, 0x78, 0x94, 0x4a, 0x02, 0x3c, 0x1f, |
| 0xe0, 0x3b, 0xad, 0x6d, 0x93 }, |
| { /* Example #4 */ |
| 0xe1, 0x99, 0x21, 0x90, 0x54, 0x9f, 0x6e, 0xd5, 0x69, 0x6a, 0x2c, |
| 0x05, 0x6c, 0x31, 0x54, 0x10 } |
| }; |
| # endif /* MBEDTLS_AES_C */ |
| |
| # if defined(MBEDTLS_DES_C) |
| /* Truncation point of message for 3DES CMAC tests */ |
| static const unsigned int des3_message_lengths[NB_CMAC_TESTS_PER_KEY] = { 0, 16, |
| 20, |
| 32 }; |
| |
| /* CMAC-TDES (Generation) - 2 Key Test Data */ |
| static const unsigned char des3_2key_key[24] = { |
| /* Key1 */ |
| 0x01, 0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef, |
| /* Key2 */ |
| 0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xEF, 0x01, |
| /* Key3 */ |
| 0x01, 0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef |
| }; |
| static const unsigned char des3_2key_subkeys[2][8] = { |
| { /* K1 */ |
| 0x0d, 0xd2, 0xcb, 0x7a, 0x3d, 0x88, 0x88, 0xd9 }, |
| { /* K2 */ |
| 0x1b, 0xa5, 0x96, 0xf4, 0x7b, 0x11, 0x11, 0xb2 } |
| }; |
| static const unsigned char |
| des3_2key_expected_result[NB_CMAC_TESTS_PER_KEY][MBEDTLS_DES3_BLOCK_SIZE] = { |
| { /* Sample #1 */ |
| 0x79, 0xce, 0x52, 0xa7, 0xf7, 0x86, 0xa9, 0x60 }, |
| { /* Sample #2 */ |
| 0xcc, 0x18, 0xa0, 0xb7, 0x9a, 0xf2, 0x41, 0x3b }, |
| { /* Sample #3 */ |
| 0xc0, 0x6d, 0x37, 0x7e, 0xcd, 0x10, 0x19, 0x69 }, |
| { /* Sample #4 */ |
| 0x9c, 0xd3, 0x35, 0x80, 0xf9, 0xb6, 0x4d, 0xfb } |
| }; |
| |
| /* CMAC-TDES (Generation) - 3 Key Test Data */ |
| static const unsigned char des3_3key_key[24] = { |
| /* Key1 */ |
| 0x01, 0x23, 0x45, 0x67, 0x89, 0xaa, 0xcd, 0xef, |
| /* Key2 */ |
| 0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef, 0x01, |
| /* Key3 */ |
| 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef, 0x01, 0x23 |
| }; |
| static const unsigned char des3_3key_subkeys[2][8] = { |
| { /* K1 */ |
| 0x9d, 0x74, 0xe7, 0x39, 0x33, 0x17, 0x96, 0xc0 }, |
| { /* K2 */ |
| 0x3a, 0xe9, 0xce, 0x72, 0x66, 0x2f, 0x2d, 0x9b } |
| }; |
| static const unsigned char |
| des3_3key_expected_result[NB_CMAC_TESTS_PER_KEY][MBEDTLS_DES3_BLOCK_SIZE] = { |
| { /* Sample #1 */ |
| 0x7d, 0xb0, 0xd3, 0x7d, 0xf9, 0x36, 0xc5, 0x50 }, |
| { /* Sample #2 */ |
| 0x30, 0x23, 0x9c, 0xf1, 0xf5, 0x2e, 0x66, 0x09 }, |
| { /* Sample #3 */ |
| 0x6c, 0x9f, 0x3e, 0xe4, 0x92, 0x3f, 0x6b, 0xe2 }, |
| { /* Sample #4 */ |
| 0x99, 0x42, 0x9b, 0xd0, 0xbF, 0x79, 0x04, 0xe5 } |
| }; |
| |
| # endif /* MBEDTLS_DES_C */ |
| |
| # if defined(MBEDTLS_AES_C) |
| /* AES AES-CMAC-PRF-128 Test Data */ |
| static const unsigned char PRFK[] = { |
| /* Key */ |
| 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 }; |
| |
| /* Message */ |
| 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 int cmac_test_subkeys(int verbose, |
| const char *testname, |
| const unsigned char *key, |
| int keybits, |
| const unsigned char *subkeys, |
| mbedtls_cipher_type_t cipher_type, |
| int block_size, |
| int num_tests) |
| { |
| int i, ret = 0; |
| mbedtls_cipher_context_t ctx; |
| const mbedtls_cipher_info_t *cipher_info; |
| unsigned char K1[MBEDTLS_CIPHER_BLKSIZE_MAX]; |
| unsigned char K2[MBEDTLS_CIPHER_BLKSIZE_MAX]; |
| |
| cipher_info = mbedtls_cipher_info_from_type(cipher_type); |
| if (cipher_info == NULL) { |
| /* Failing at this point must be due to a build issue */ |
| return MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE; |
| } |
| |
| for (i = 0; i < num_tests; i++) { |
| if (verbose != 0) |
| mbedtls_printf(" %s CMAC subkey #%d: ", testname, i + 1); |
| |
| mbedtls_cipher_init(&ctx); |
| |
| if ((ret = mbedtls_cipher_setup(&ctx, cipher_info)) != 0) { |
| if (verbose != 0) |
| mbedtls_printf("test execution failed\n"); |
| |
| goto cleanup; |
| } |
| |
| if ((ret = mbedtls_cipher_setkey(&ctx, key, keybits, |
| MBEDTLS_ENCRYPT)) != 0) { |
| /* When CMAC is implemented by an alternative implementation, or |
| * the underlying primitive itself is implemented alternatively, |
| * AES-192 may be unavailable. This should not cause the selftest |
| * function to fail. */ |
| if ((ret == MBEDTLS_ERR_PLATFORM_FEATURE_UNSUPPORTED || |
| ret == MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE) && |
| cipher_type == MBEDTLS_CIPHER_AES_192_ECB) { |
| if (verbose != 0) |
| mbedtls_printf("skipped\n"); |
| goto next_test; |
| } |
| |
| if (verbose != 0) |
| mbedtls_printf("test execution failed\n"); |
| |
| goto cleanup; |
| } |
| |
| ret = cmac_generate_subkeys(&ctx, K1, K2); |
| if (ret != 0) { |
| if (verbose != 0) |
| mbedtls_printf("failed\n"); |
| |
| goto cleanup; |
| } |
| |
| if ((ret = memcmp(K1, subkeys, block_size)) != 0 || |
| (ret = memcmp(K2, &subkeys[block_size], block_size)) != 0) { |
| if (verbose != 0) |
| mbedtls_printf("failed\n"); |
| |
| goto cleanup; |
| } |
| |
| if (verbose != 0) |
| mbedtls_printf("passed\n"); |
| |
| next_test: |
| mbedtls_cipher_free(&ctx); |
| } |
| |
| ret = 0; |
| goto exit; |
| |
| cleanup: |
| mbedtls_cipher_free(&ctx); |
| |
| exit: |
| return ret; |
| } |
| |
| static 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 *expected_result, |
| mbedtls_cipher_type_t cipher_type, |
| int block_size, |
| int num_tests) |
| { |
| const mbedtls_cipher_info_t *cipher_info; |
| int i, ret = 0; |
| unsigned char output[MBEDTLS_CIPHER_BLKSIZE_MAX]; |
| |
| cipher_info = mbedtls_cipher_info_from_type(cipher_type); |
| if (cipher_info == NULL) { |
| /* Failing at this point must be due to a build issue */ |
| ret = MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE; |
| goto exit; |
| } |
| |
| for (i = 0; i < num_tests; i++) { |
| if (verbose != 0) |
| mbedtls_printf(" %s CMAC #%d: ", testname, i + 1); |
| |
| if ((ret = mbedtls_cipher_cmac(cipher_info, key, keybits, messages, |
| message_lengths[i], output)) != 0) { |
| /* When CMAC is implemented by an alternative implementation, or |
| * the underlying primitive itself is implemented alternatively, |
| * AES-192 and/or 3DES may be unavailable. This should not cause |
| * the selftest function to fail. */ |
| if ((ret == MBEDTLS_ERR_PLATFORM_FEATURE_UNSUPPORTED || |
| ret == MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE) && |
| (cipher_type == MBEDTLS_CIPHER_AES_192_ECB || |
| cipher_type == MBEDTLS_CIPHER_DES_EDE3_ECB)) { |
| if (verbose != 0) |
| mbedtls_printf("skipped\n"); |
| continue; |
| } |
| |
| if (verbose != 0) |
| mbedtls_printf("failed\n"); |
| goto exit; |
| } |
| |
| if ((ret = memcmp(output, &expected_result[i * block_size], |
| block_size)) != 0) { |
| if (verbose != 0) |
| mbedtls_printf("failed\n"); |
| goto exit; |
| } |
| |
| if (verbose != 0) |
| mbedtls_printf("passed\n"); |
| } |
| ret = 0; |
| |
| exit: |
| return ret; |
| } |
| |
| # if defined(MBEDTLS_AES_C) |
| static int test_aes128_cmac_prf(int verbose) |
| { |
| int i; |
| int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
| unsigned char output[MBEDTLS_AES_BLOCK_SIZE]; |
| |
| for (i = 0; i < NB_PRF_TESTS; i++) { |
| mbedtls_printf(" AES CMAC 128 PRF #%d: ", i); |
| ret = mbedtls_aes_cmac_prf_128(PRFK, PRFKlen[i], PRFM, 20, output); |
| if (ret != 0 || memcmp(output, PRFT[i], MBEDTLS_AES_BLOCK_SIZE) != 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 = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
| |
| # if defined(MBEDTLS_AES_C) |
| /* AES-128 */ |
| if ((ret = cmac_test_subkeys( |
| verbose, "AES 128", aes_128_key, 128, |
| (const unsigned char *)aes_128_subkeys, MBEDTLS_CIPHER_AES_128_ECB, |
| MBEDTLS_AES_BLOCK_SIZE, NB_CMAC_TESTS_PER_KEY)) != 0) { |
| return ret; |
| } |
| |
| if ((ret = cmac_test_wth_cipher( |
| verbose, "AES 128", aes_128_key, 128, test_message, |
| aes_message_lengths, |
| (const unsigned char *)aes_128_expected_result, |
| MBEDTLS_CIPHER_AES_128_ECB, MBEDTLS_AES_BLOCK_SIZE, |
| NB_CMAC_TESTS_PER_KEY)) != 0) { |
| return ret; |
| } |
| |
| /* AES-192 */ |
| if ((ret = cmac_test_subkeys( |
| verbose, "AES 192", aes_192_key, 192, |
| (const unsigned char *)aes_192_subkeys, MBEDTLS_CIPHER_AES_192_ECB, |
| MBEDTLS_AES_BLOCK_SIZE, NB_CMAC_TESTS_PER_KEY)) != 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_expected_result, |
| MBEDTLS_CIPHER_AES_192_ECB, MBEDTLS_AES_BLOCK_SIZE, |
| NB_CMAC_TESTS_PER_KEY)) != 0) { |
| return ret; |
| } |
| |
| /* AES-256 */ |
| if ((ret = cmac_test_subkeys( |
| verbose, "AES 256", aes_256_key, 256, |
| (const unsigned char *)aes_256_subkeys, MBEDTLS_CIPHER_AES_256_ECB, |
| MBEDTLS_AES_BLOCK_SIZE, NB_CMAC_TESTS_PER_KEY)) != 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_expected_result, |
| MBEDTLS_CIPHER_AES_256_ECB, MBEDTLS_AES_BLOCK_SIZE, |
| NB_CMAC_TESTS_PER_KEY)) != 0) { |
| return ret; |
| } |
| # endif /* MBEDTLS_AES_C */ |
| |
| # if defined(MBEDTLS_DES_C) |
| /* 3DES 2 key */ |
| if ((ret = cmac_test_subkeys(verbose, "3DES 2 key", des3_2key_key, 192, |
| (const unsigned char *)des3_2key_subkeys, |
| MBEDTLS_CIPHER_DES_EDE3_ECB, |
| MBEDTLS_DES3_BLOCK_SIZE, |
| NB_CMAC_TESTS_PER_KEY)) != 0) { |
| return ret; |
| } |
| |
| if ((ret = cmac_test_wth_cipher( |
| verbose, "3DES 2 key", des3_2key_key, 192, test_message, |
| des3_message_lengths, |
| (const unsigned char *)des3_2key_expected_result, |
| MBEDTLS_CIPHER_DES_EDE3_ECB, MBEDTLS_DES3_BLOCK_SIZE, |
| NB_CMAC_TESTS_PER_KEY)) != 0) { |
| return ret; |
| } |
| |
| /* 3DES 3 key */ |
| if ((ret = cmac_test_subkeys(verbose, "3DES 3 key", des3_3key_key, 192, |
| (const unsigned char *)des3_3key_subkeys, |
| MBEDTLS_CIPHER_DES_EDE3_ECB, |
| MBEDTLS_DES3_BLOCK_SIZE, |
| NB_CMAC_TESTS_PER_KEY)) != 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_expected_result, |
| MBEDTLS_CIPHER_DES_EDE3_ECB, MBEDTLS_DES3_BLOCK_SIZE, |
| NB_CMAC_TESTS_PER_KEY)) != 0) { |
| return ret; |
| } |
| # endif /* MBEDTLS_DES_C */ |
| |
| # if defined(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 */ |