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