mbedtls/library/ccm.c

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2014-05-02 13:17:29 +00:00
/*
* NIST SP800-38C compliant CCM implementation
*
* Copyright (C) 2014, Brainspark B.V.
*
* This file is part of PolarSSL (http://www.polarssl.org)
* Lead Maintainer: Paul Bakker <polarssl_maintainer at polarssl.org>
*
* All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
/*
* Definition of CCM:
* http://csrc.nist.gov/publications/nistpubs/800-38C/SP800-38C_updated-July20_2007.pdf
* RFC 3610 "Counter with CBC-MAC (CCM)"
*
* Related:
* RFC 5116 "An Interface and Algorithms for Authenticated Encryption"
*/
#if !defined(POLARSSL_CONFIG_FILE)
#include "polarssl/config.h"
#else
#include POLARSSL_CONFIG_FILE
#endif
#if defined(POLARSSL_CCM_C)
#include "polarssl/ccm.h"
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/*
* Initialize context
*/
int ccm_init( ccm_context *ctx, cipher_id_t cipher,
const unsigned char *key, unsigned int keysize )
{
int ret;
const cipher_info_t *cipher_info;
memset( ctx, 0, sizeof( ccm_context ) );
cipher_info = cipher_info_from_values( cipher, keysize, POLARSSL_MODE_ECB );
if( cipher_info == NULL )
return( POLARSSL_ERR_CCM_BAD_INPUT );
if( cipher_info->block_size != 16 )
return( POLARSSL_ERR_CCM_BAD_INPUT );
if( ( ret = cipher_init_ctx( &ctx->cipher_ctx, cipher_info ) ) != 0 )
return( ret );
if( ( ret = cipher_setkey( &ctx->cipher_ctx, key, keysize,
POLARSSL_ENCRYPT ) ) != 0 )
{
return( ret );
}
return( 0 );
}
/*
* Free context
*/
void ccm_free( ccm_context *ctx )
{
(void) cipher_free_ctx( &ctx->cipher_ctx );
memset( ctx, 0, sizeof( ccm_context ) );
}
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#if defined(POLARSSL_SELF_TEST) && defined(POLARSSL_AES_C)
#if defined(POLARSSL_PLATFORM_C)
#include "polarssl/platform.h"
#else
#define polarssl_printf printf
#endif
int ccm_self_test( int verbose )
{
if( verbose != 0 )
polarssl_printf( " CCM: skip\n" );
if( verbose != 0 )
polarssl_printf( "\n" );
return( 0 );
}
#endif /* POLARSSL_SELF_TEST && POLARSSL_AES_C */
#endif /* POLARSSL_CCM_C */