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Add ccm_init/free()

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Manuel Pégourié-Gonnard 2014-05-06 12:12:45 +02:00
parent a6916fada8
commit 9fe0d13e8d
4 changed files with 100 additions and 0 deletions
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39
library/ccm.c
View file

@ -42,6 +42,45 @@
#include "polarssl/ccm.h"
/*
* 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 ) );
}
#if defined(POLARSSL_SELF_TEST) && defined(POLARSSL_AES_C)