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return plaintext data faster on unpadded decryption

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Andy Leiserson 2017-04-28 20:01:49 -07:00 committed by Andrzej Kurek
parent 5166a188eb
commit 38a29ee5d0
1 changed files with 12 additions and 2 deletions
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14
library/cipher.c
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@ -325,8 +325,10 @@ int mbedtls_cipher_update( mbedtls_cipher_context_t *ctx, const unsigned char *i
/* /*
* If there is not enough data for a full block, cache it. * If there is not enough data for a full block, cache it.
*/ */
if( ( ctx->operation == MBEDTLS_DECRYPT && if( ( ctx->operation == MBEDTLS_DECRYPT && NULL != ctx->add_padding &&
ilen <= block_size - ctx->unprocessed_len ) || ilen <= block_size - ctx->unprocessed_len ) ||
( ctx->operation == MBEDTLS_DECRYPT && NULL == ctx->add_padding &&
ilen < block_size - ctx->unprocessed_len ) ||
( ctx->operation == MBEDTLS_ENCRYPT && ( ctx->operation == MBEDTLS_ENCRYPT &&
ilen < block_size - ctx->unprocessed_len ) ) ilen < block_size - ctx->unprocessed_len ) )
{ {
@ -372,9 +374,17 @@ int mbedtls_cipher_update( mbedtls_cipher_context_t *ctx, const unsigned char *i
return MBEDTLS_ERR_CIPHER_INVALID_CONTEXT; return MBEDTLS_ERR_CIPHER_INVALID_CONTEXT;
} }
/* Encryption: only cache partial blocks
* Decryption w/ padding: always keep at least one whole block
* Decryption w/o padding: only cache partial blocks
*/
copy_len = ilen % block_size; copy_len = ilen % block_size;
if( copy_len == 0 && ctx->operation == MBEDTLS_DECRYPT ) if( copy_len == 0 &&
ctx->operation == MBEDTLS_DECRYPT &&
NULL != ctx->add_padding)
{
copy_len = block_size; copy_len = block_size;
}
memcpy( ctx->unprocessed_data, &( input[ilen - copy_len] ), memcpy( ctx->unprocessed_data, &( input[ilen - copy_len] ),
copy_len ); copy_len );