857 lines
25 KiB
C
857 lines
25 KiB
C
/*
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* NIST SP800-38B compliant CMAC implementation
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*
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* Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed under the Apache License, Version 2.0 (the "License"); you may
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* not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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* This file is part of mbed TLS (https://tls.mbed.org)
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*/
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/*
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* Definition of CMAC:
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* http://csrc.nist.gov/publications/nistpubs/800-38B/SP_800-38B.pdf
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* RFC 4493 "The AES-CMAC Algorithm"
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*/
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#if !defined(MBEDTLS_CONFIG_FILE)
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#include "mbedtls/config.h"
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#else
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#include MBEDTLS_CONFIG_FILE
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#endif
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#if defined(MBEDTLS_CMAC_C)
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#include "mbedtls/cmac.h"
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#include <string.h>
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#if defined(MBEDTLS_SELF_TEST) && defined(MBEDTLS_AES_C)
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#if defined(MBEDTLS_PLATFORM_C)
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#include "mbedtls/platform.h"
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#else
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#include <stdio.h>
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#define mbedtls_printf printf
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#endif /* MBEDTLS_PLATFORM_C */
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#endif /* MBEDTLS_SELF_TEST && MBEDTLS_AES_C */
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/* Implementation that should never be optimized out by the compiler */
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static void mbedtls_zeroize( void *v, size_t n ) {
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volatile unsigned char *p = v; while( n-- ) *p++ = 0;
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}
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/*
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* Initialize context
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*/
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void mbedtls_cmac_init( mbedtls_cmac_context *ctx )
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{
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memset( ctx, 0, sizeof( mbedtls_cmac_context ) );
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}
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/*
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* Multiplication by u in the Galois field of GF(2^n)
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*
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* As explained in the paper, this can be computed:
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* If MSB(p) = 0, then p = (p << 1)
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* If MSB(p) = 1, then p = (p << 1) ^ R_n
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* with R_64 = 0x1B and R_128 = 0x87
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*
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* Input and output MUST not point to the same buffer
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* Block size must be 8 byes or 16 bytes.
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*/
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static int cmac_multiply_by_u( unsigned char *output,
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const unsigned char *input,
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size_t blocksize )
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{
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const unsigned char R_128 = 0x87;
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const unsigned char R_64 = 0x1B;
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unsigned char R_n, mask;
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unsigned char overflow = 0x00;
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int i, starting_index;
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starting_index = blocksize -1;
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if( blocksize == 16 )
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{
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R_n = R_128;
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} else if( blocksize == 8 )
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{
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R_n = R_64;
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} else
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{
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return( MBEDTLS_ERR_CMAC_BAD_INPUT );
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}
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for( i = starting_index; i >= 0; i-- )
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{
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output[i] = input[i] << 1 | overflow;
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overflow = input[i] >> 7;
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}
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/* mask = ( input[0] >> 7 ) ? 0xff : 0x00
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* using bit operations to avoid branches */
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/* MSVC has a warning about unary minus on unsigned, but this is
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* well-defined and precisely what we want to do here */
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#if defined(_MSC_VER)
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#pragma warning( push )
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#pragma warning( disable : 4146 )
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#endif
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mask = - ( input[0] >> 7 );
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#if defined(_MSC_VER)
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#pragma warning( pop )
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#endif
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output[starting_index] ^= R_n & mask;
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return( 0 );
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}
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/*
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* Generate subkeys
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*/
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static int cmac_generate_subkeys( mbedtls_cmac_context *ctx )
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{
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int ret;
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unsigned char *L;
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size_t olen, block_size;
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block_size = ctx->cipher_ctx.cipher_info->block_size;
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L = mbedtls_calloc( block_size, sizeof( unsigned char ) );
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if( L == NULL )
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{
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ret = MBEDTLS_ERR_CMAC_ALLOC_FAILED;
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goto exit;
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}
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/* Calculate Ek(0) */
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if( ( ret = mbedtls_cipher_update( &ctx->cipher_ctx,
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L, block_size, L, &olen ) ) != 0 )
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{
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goto exit;
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}
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/*
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* Generate K1 and K2
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*/
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if( ( ret = cmac_multiply_by_u( ctx->K1, L , block_size ) ) != 0 )
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goto exit;
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if( ( ret = cmac_multiply_by_u( ctx->K2, ctx->K1 , block_size ) ) != 0 )
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goto exit;
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exit:
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if( L != NULL )
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mbedtls_zeroize( L, sizeof( L ) );
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mbedtls_free( L );
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return( ret );
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}
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/*
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* Set key and prepare context for use
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*/
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int mbedtls_cmac_setkey( mbedtls_cmac_context *ctx,
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mbedtls_cipher_id_t cipher,
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const unsigned char *key,
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unsigned int keybits )
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{
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int ret;
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const mbedtls_cipher_info_t *cipher_info;
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cipher_info = mbedtls_cipher_info_from_values( cipher, keybits,
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MBEDTLS_MODE_ECB );
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if( cipher_info == NULL )
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return( MBEDTLS_ERR_CMAC_BAD_INPUT );
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mbedtls_cipher_free( &ctx->cipher_ctx );
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if( ( ret = mbedtls_cipher_setup( &ctx->cipher_ctx, cipher_info ) ) != 0 )
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return( ret );
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if( ( ret = mbedtls_cipher_setkey( &ctx->cipher_ctx, key, keybits,
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MBEDTLS_ENCRYPT ) ) != 0 )
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{
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return( ret );
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}
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ctx->K1 = mbedtls_calloc( cipher_info->block_size, sizeof( unsigned char ) );
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ctx->K2 = mbedtls_calloc( cipher_info->block_size, sizeof( unsigned char ) );
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if( ctx->K1 == NULL || ctx->K2 == NULL )
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{
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mbedtls_free(ctx->K1);
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mbedtls_free(ctx->K2);
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return( MBEDTLS_ERR_CMAC_ALLOC_FAILED );
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}
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return( cmac_generate_subkeys( ctx ) );
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}
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/*
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* Free context
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*/
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void mbedtls_cmac_free( mbedtls_cmac_context *ctx )
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{
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int block_size;
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block_size = ctx->cipher_ctx.cipher_info->block_size;
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mbedtls_cipher_free( &ctx->cipher_ctx );
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if( ctx->K1 != NULL )
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mbedtls_zeroize( ctx->K1, block_size * sizeof( unsigned char ) );
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if( ctx->K2 != NULL )
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mbedtls_zeroize( ctx->K2, block_size * sizeof( unsigned char ) );
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mbedtls_free( ctx->K1 );
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mbedtls_free( ctx->K2 );
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}
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/*
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* Create padded last block from (partial) last block.
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*
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* We can't use the padding option from the cipher layer, as it only works for
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* CBC and we use ECB mode, and anyway we need to XOR K1 or K2 in addition.
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*/
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static void cmac_pad( unsigned char padded_block[16],
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size_t padded_block_len,
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const unsigned char *last_block,
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size_t last_block_len )
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{
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size_t j;
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for( j = 0; j < padded_block_len; j++ )
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{
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if( j < last_block_len )
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padded_block[j] = last_block[j];
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else if( j == last_block_len )
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padded_block[j] = 0x80;
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else
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padded_block[j] = 0x00;
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}
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}
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/*
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* XOR Block
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* Here, macro results in smaller compiled code than static inline function
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*/
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#define XOR_BLOCK( o, i1, i2 ) \
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for( i = 0; i < block_size; i++ ) \
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( o )[i] = ( i1 )[i] ^ ( i2 )[i];
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/*
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* Update the CMAC state using an input block
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*/
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#define UPDATE_CMAC( x ) \
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do { \
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XOR_BLOCK( state, ( x ), state ); \
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if( ( ret = mbedtls_cipher_update( &ctx->cipher_ctx, \
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state, block_size, \
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state, &olen ) ) != 0 ) \
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{ \
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goto exit; \
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} \
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} while( 0 )
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/*
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* Generate tag on complete message
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*/
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int mbedtls_cmac_generate( mbedtls_cmac_context *ctx,
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const unsigned char *input, size_t in_len,
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unsigned char *tag, size_t tag_len )
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{
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unsigned char *state;
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unsigned char *M_last;
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int n, j, ret, needs_padding;
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size_t olen, block_size, i;
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ret = 0;
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block_size = ctx->cipher_ctx.cipher_info->block_size;
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state = mbedtls_calloc( block_size, sizeof( unsigned char ) );
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M_last = mbedtls_calloc( block_size, sizeof( unsigned char ) );
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if( state == NULL || M_last == NULL )
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{
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ret = MBEDTLS_ERR_CMAC_ALLOC_FAILED;
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goto exit;
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}
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if( tag_len < 2 || tag_len > block_size || tag_len % 2 != 0 )
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{
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ret = MBEDTLS_ERR_CMAC_BAD_INPUT;
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goto exit;
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}
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if( in_len == 0 )
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needs_padding = 1;
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else
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needs_padding = in_len % block_size != 0;
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n = in_len / block_size + needs_padding;
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/* Calculate last block */
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if( needs_padding )
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{
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cmac_pad( M_last, block_size, input + block_size * ( n - 1 ), in_len % block_size );
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XOR_BLOCK( M_last, M_last, ctx->K2 );
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}
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else
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{
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/* Last block is complete block */
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XOR_BLOCK( M_last, input + block_size * ( n - 1 ), ctx->K1 );
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}
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for( j = 0; j < n - 1; j++ )
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UPDATE_CMAC( input + block_size * j );
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UPDATE_CMAC( M_last );
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memcpy( tag, state, tag_len );
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exit:
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mbedtls_free( state );
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mbedtls_free( M_last );
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return( ret );
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}
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#undef XOR_BLOCK
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#undef UPDATE_CMAC
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/*
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* Verify tag on complete message
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*/
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int mbedtls_cmac_verify( mbedtls_cmac_context *ctx,
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const unsigned char *input, size_t in_len,
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const unsigned char *tag, size_t tag_len )
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{
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int ret;
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unsigned char *check_tag;
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unsigned char i;
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int diff;
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check_tag = mbedtls_calloc( ctx->cipher_ctx.cipher_info->block_size,
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sizeof( unsigned char ) );
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if( check_tag == NULL )
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{
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ret = MBEDTLS_ERR_CMAC_ALLOC_FAILED;
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goto exit;
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}
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if( ( ret = mbedtls_cmac_generate( ctx, input, in_len,
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check_tag, tag_len ) ) != 0 )
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{
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goto exit;
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}
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/* Check tag in "constant-time" */
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for( diff = 0, i = 0; i < tag_len; i++ )
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diff |= tag[i] ^ check_tag[i];
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if( diff != 0 )
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ret = MBEDTLS_ERR_CMAC_VERIFY_FAILED;
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goto exit;
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exit:
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mbedtls_free( check_tag );
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return( ret );
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}
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#ifdef MBEDTLS_AES_C
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/*
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* PRF based on CMAC with AES-128
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* See RFC 4615
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*/
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int mbedtls_aes_cmac_prf_128( const unsigned char *key, size_t key_length,
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const unsigned char *input, size_t in_len,
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unsigned char tag[16] )
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{
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int ret;
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mbedtls_cmac_context ctx;
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unsigned char zero_key[16];
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unsigned char int_key[16];
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mbedtls_cmac_init(&ctx );
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if( key_length == 16 )
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{
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/* Use key as is */
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memcpy( int_key, key, 16 );
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}
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else
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{
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mbedtls_cmac_context zero_ctx;
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/* Key is AES_CMAC( 0, key ) */
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mbedtls_cmac_init( &zero_ctx );
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memset( zero_key, 0, 16 );
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ret = mbedtls_cmac_setkey( &zero_ctx, MBEDTLS_CIPHER_ID_AES,
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zero_key, 8 * sizeof( zero_key ) );
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if( ret != 0 )
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goto exit;
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ret = mbedtls_cmac_generate( &zero_ctx, key, key_length, int_key, 16 );
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if( ret != 0 )
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goto exit;
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}
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ret = mbedtls_cmac_setkey( &ctx, MBEDTLS_CIPHER_ID_AES,
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int_key, 8 * sizeof( int_key ) );
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if( ret != 0 )
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goto exit;
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ret = mbedtls_cmac_generate( &ctx, input, in_len, tag, 16 );
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exit:
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mbedtls_zeroize( int_key, sizeof( int_key ) );
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mbedtls_cmac_free( &ctx );
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return( ret );
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}
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#endif /* MBEDTLS_AES_C */
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#ifdef MBEDTLS_SELF_TEST
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/*
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* CMAC test data from SP800-38B Appendix D.1 (corrected)
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* http://csrc.nist.gov/publications/nistpubs/800-38B/Updated_CMAC_Examples.pdf
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*
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* AES-CMAC-PRF-128 test data from RFC 4615
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* https://tools.ietf.org/html/rfc4615#page-4
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*/
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#define NB_CMAC_TESTS_PER_KEY 4
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#define NB_PRF_TESTS 3
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#define AES_BLOCK_SIZE 16
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#define DES3_BLOCK_SIZE 8
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#if defined(MBEDTLS_AES_C) || defined(MBEDTLS_DES_C)
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/* All CMAC test inputs are truncated from the same 64 byte buffer. */
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static const unsigned char test_message[] = {
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0x6b, 0xc1, 0xbe, 0xe2, 0x2e, 0x40, 0x9f, 0x96,
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0xe9, 0x3d, 0x7e, 0x11, 0x73, 0x93, 0x17, 0x2a,
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0xae, 0x2d, 0x8a, 0x57, 0x1e, 0x03, 0xac, 0x9c,
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0x9e, 0xb7, 0x6f, 0xac, 0x45, 0xaf, 0x8e, 0x51,
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0x30, 0xc8, 0x1c, 0x46, 0xa3, 0x5c, 0xe4, 0x11,
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0xe5, 0xfb, 0xc1, 0x19, 0x1a, 0x0a, 0x52, 0xef,
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0xf6, 0x9f, 0x24, 0x45, 0xdf, 0x4f, 0x9b, 0x17,
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0xad, 0x2b, 0x41, 0x7b, 0xe6, 0x6c, 0x37, 0x10
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};
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#endif /* defined(MBEDTLS_AES_C) || defined(MBEDTLS_DES_C) */
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#ifdef MBEDTLS_AES_C
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/* Truncation point of message for AES CMAC tests */
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static const unsigned int aes_message_lengths[NB_CMAC_TESTS_PER_KEY] = {
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0,
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16,
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40,
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64
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};
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/* AES 128 CMAC Test Data */
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static const unsigned char aes_128_key[16] = {
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0x2b, 0x7e, 0x15, 0x16, 0x28, 0xae, 0xd2, 0xa6,
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0xab, 0xf7, 0x15, 0x88, 0x09, 0xcf, 0x4f, 0x3c
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};
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static const unsigned char aes_128_subkeys[2][AES_BLOCK_SIZE] = {
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{
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0xfb, 0xee, 0xd6, 0x18, 0x35, 0x71, 0x33, 0x66,
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0x7c, 0x85, 0xe0, 0x8f, 0x72, 0x36, 0xa8, 0xde
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},
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{
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0xf7, 0xdd, 0xac, 0x30, 0x6a, 0xe2, 0x66, 0xcc,
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0xf9, 0x0b, 0xc1, 0x1e, 0xe4, 0x6d, 0x51, 0x3b
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}
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};
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static const unsigned char aes_128_expected_result[NB_CMAC_TESTS_PER_KEY][AES_BLOCK_SIZE] = {
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{
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0xbb, 0x1d, 0x69, 0x29, 0xe9, 0x59, 0x37, 0x28,
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0x7f, 0xa3, 0x7d, 0x12, 0x9b, 0x75, 0x67, 0x46
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},
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{
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0x07, 0x0a, 0x16, 0xb4, 0x6b, 0x4d, 0x41, 0x44,
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0xf7, 0x9b, 0xdd, 0x9d, 0xd0, 0x4a, 0x28, 0x7c
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},
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{
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0xdf, 0xa6, 0x67, 0x47, 0xde, 0x9a, 0xe6, 0x30,
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0x30, 0xca, 0x32, 0x61, 0x14, 0x97, 0xc8, 0x27
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},
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{
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0x51, 0xf0, 0xbe, 0xbf, 0x7e, 0x3b, 0x9d, 0x92,
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0xfc, 0x49, 0x74, 0x17, 0x79, 0x36, 0x3c, 0xfe
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}
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};
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/* AES 192 CMAC Test Data */
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static const unsigned char aes_192_key[24] = {
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0x8e, 0x73, 0xb0, 0xf7, 0xda, 0x0e, 0x64, 0x52,
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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 */
|
|
|
|
int test_cmac_with_cipher( int verbose,
|
|
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;
|
|
}
|
|
mbedtls_printf( "passed\n" );
|
|
}
|
|
exit:
|
|
mbedtls_free( tag );
|
|
mbedtls_cmac_free( &ctx );
|
|
return( ret );
|
|
}
|
|
|
|
#ifdef MBEDTLS_AES_C
|
|
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 = test_cmac_with_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 = test_cmac_with_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 = test_cmac_with_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 = test_cmac_with_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 = test_cmac_with_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 */
|