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Refactor some argument checks for readability

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No intended behavior change.
This commit is contained in:
Gilles Peskine 2018-06-04 17:17:16 +02:00 committed by itayzafrir
parent 7e9288520f
commit 89d789c9bc
1 changed files with 27 additions and 15 deletions
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42
library/psa_crypto.c
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@ -1456,13 +1456,22 @@ psa_status_t psa_cipher_update( psa_cipher_operation_t *operation,
size_t *output_length )
{
int ret = MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE;
size_t expected_output_size =
( ( operation->ctx.cipher.unprocessed_len + input_length ) /
operation->block_size ) * operation->block_size;
if( ( ( PSA_ALG_IS_STREAM_CIPHER( operation->alg ) ) &&
( output_size < input_length ) ) ||
( ( PSA_ALG_IS_BLOCK_CIPHER( operation->alg ) ) &&
( output_size < expected_output_size ) ) )
size_t expected_output_size;
if( PSA_ALG_IS_BLOCK_CIPHER( operation->alg ) )
{
/* Take the unprocessed partial block left over from previous
* update calls, if any, plus the input to this call. Remove
* the last partial block, if any. You get the data that will be
* output in this call. */
expected_output_size =
( operation->ctx.cipher.unprocessed_len + input_length )
/ operation->block_size * operation->block_size;
}
else
{
expected_output_size = input_length;
}
if( output_size < expected_output_size )
return( PSA_ERROR_BUFFER_TOO_SMALL );
ret = mbedtls_cipher_update( &operation->ctx.cipher, input,
@ -1493,14 +1502,17 @@ psa_status_t psa_cipher_finish( psa_cipher_operation_t *operation,
{
if( operation->ctx.cipher.unprocessed_len > operation->block_size )
return( PSA_ERROR_INVALID_ARGUMENT );
if( ( ( operation->alg & PSA_ALG_BLOCK_CIPHER_PADDING_MASK )
== PSA_ALG_BLOCK_CIPHER_PAD_NONE )
&& ( operation->ctx.cipher.unprocessed_len != 0 ) )
return( PSA_ERROR_INVALID_ARGUMENT );
if( ( ( operation->alg & PSA_ALG_BLOCK_CIPHER_PADDING_MASK )
== PSA_ALG_BLOCK_CIPHER_PAD_PKCS7 )
&& ( *output_length != operation->block_size ) )
return( PSA_ERROR_INVALID_ARGUMENT );
switch( operation->alg & PSA_ALG_BLOCK_CIPHER_PADDING_MASK )
{
case PSA_ALG_BLOCK_CIPHER_PAD_NONE:
if( operation->ctx.cipher.unprocessed_len != 0 )
return( PSA_ERROR_INVALID_ARGUMENT );
break;
case PSA_ALG_BLOCK_CIPHER_PAD_PKCS7:
if( *output_length != operation->block_size )
return( PSA_ERROR_INVALID_ARGUMENT );
break;
}
}
ret = mbedtls_cipher_finish( &operation->ctx.cipher, temp_output_buffer,