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Split cipher_update_ad() out or cipher_reset()

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This commit is contained in:
Manuel Pégourié-Gonnard 2013-09-03 13:54:12 +02:00
parent a235b5b5bd
commit 2adc40c346
6 changed files with 59 additions and 15 deletions
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22
library/cipher.c
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@ -415,14 +415,32 @@ int cipher_set_iv( cipher_context_t *ctx,
return 0;
}
int cipher_reset( cipher_context_t *ctx,
const unsigned char *ad, size_t ad_len )
int cipher_reset( cipher_context_t *ctx )
{
if( NULL == ctx || NULL == ctx->cipher_info )
return POLARSSL_ERR_CIPHER_BAD_INPUT_DATA;
ctx->unprocessed_len = 0;
return 0;
}
int cipher_update_ad( cipher_context_t *ctx,
const unsigned char *ad, size_t ad_len )
{
if( NULL == ctx || NULL == ctx->cipher_info )
return POLARSSL_ERR_CIPHER_BAD_INPUT_DATA;
#if defined(POLARSSL_GCM_C)
if( POLARSSL_MODE_GCM == ctx->cipher_info->mode )
{
/* Make sure we're called right after cipher_reset() */
if( ((gcm_context *) ctx->cipher_ctx)->len != 0 ||
((gcm_context *) ctx->cipher_ctx)->add_len != 0 )
{
return POLARSSL_ERR_CIPHER_FEATURE_UNAVAILABLE;
}
return gcm_starts( ctx->cipher_ctx, ctx->operation,
ctx->iv, ctx->iv_size, ad, ad_len );
}