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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
+ *
+ * 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 */
generated by cgit v1.2.3 (git 2.25.1) at 2024-06-13 21:25:01 +0000