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mbedtls/library/cmac.c
Minos Galanakis b70f0fd9a9 Merge branch 'development' into 'development-restricted' 
Signed-off-by: Minos Galanakis <minos.galanakis@arm.com>
2024-03-19 22:24:40 +00:00

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/**
* \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 OR GPL-2.0-or-later
*/
/*
* 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 "constant_time_internal.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;
unsigned char R_n;
uint32_t overflow = 0x00;
int i;
if (blocksize == MBEDTLS_AES_BLOCK_SIZE) {
R_n = R_128;
}
#if defined(MBEDTLS_DES_C)
else if (blocksize == MBEDTLS_DES3_BLOCK_SIZE) {
const unsigned char R_64 = 0x1B;
R_n = R_64;
}
#endif
else {
return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA;
}
for (i = (int) blocksize - 4; i >= 0; i -= 4) {
uint32_t i32 = MBEDTLS_GET_UINT32_BE(&input[i], 0);
uint32_t new_overflow = i32 >> 31;
i32 = (i32 << 1) | overflow;
MBEDTLS_PUT_UINT32_BE(i32, &output[i], 0);
overflow = new_overflow;
}
R_n = (unsigned char) mbedtls_ct_uint_if_else_0(mbedtls_ct_bool(input[0] >> 7), R_n);
output[blocksize - 1] ^= R_n;
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_CMAC_MAX_BLOCK_SIZE];
size_t olen, block_size;
mbedtls_platform_zeroize(L, sizeof(L));
block_size = mbedtls_cipher_info_get_block_size(ctx->cipher_info);
/* 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)
/*
* 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_CMAC_MAX_BLOCK_SIZE],
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 = mbedtls_cipher_info_get_type(ctx->cipher_info);
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 = mbedtls_cipher_info_get_block_size(ctx->cipher_info);
state = ctx->cmac_ctx->state;
/* Without the MBEDTLS_ASSUME below, gcc -O3 will generate a warning of the form
* error: writing 16 bytes into a region of size 0 [-Werror=stringop-overflow=] */
MBEDTLS_ASSUME(block_size <= MBEDTLS_CMAC_MAX_BLOCK_SIZE);
/* 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);
mbedtls_xor_no_simd(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++) {
mbedtls_xor_no_simd(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_CMAC_MAX_BLOCK_SIZE];
unsigned char K2[MBEDTLS_CMAC_MAX_BLOCK_SIZE];
unsigned char M_last[MBEDTLS_CMAC_MAX_BLOCK_SIZE];
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 = mbedtls_cipher_info_get_block_size(ctx->cipher_info);
MBEDTLS_ASSUME(block_size <= MBEDTLS_CMAC_MAX_BLOCK_SIZE); // silence GCC warning
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);
mbedtls_xor(M_last, M_last, K2, block_size);
} else {
/* Last block is complete block */
mbedtls_xor(M_last, last_block, K1, block_size);
}
mbedtls_xor(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_CMAC_MAX_BLOCK_SIZE);
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 */
#if !defined(MBEDTLS_AES_ONLY_128_BIT_KEY_LENGTH)
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
}
};
#endif /* !MBEDTLS_AES_ONLY_128_BIT_KEY_LENGTH */
/* CMAC-AES256 Test Data */
#if !defined(MBEDTLS_AES_ONLY_128_BIT_KEY_LENGTH)
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_ONLY_128_BIT_KEY_LENGTH */
#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_CMAC_MAX_BLOCK_SIZE];
unsigned char K2[MBEDTLS_CMAC_MAX_BLOCK_SIZE];
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_CMAC_MAX_BLOCK_SIZE];
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 !defined(MBEDTLS_AES_ONLY_128_BIT_KEY_LENGTH)
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;
}
#endif /* !MBEDTLS_AES_ONLY_128_BIT_KEY_LENGTH */
/* AES-256 */
#if !defined(MBEDTLS_AES_ONLY_128_BIT_KEY_LENGTH)
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_ONLY_128_BIT_KEY_LENGTH */
#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 */
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