lib/mbedtls
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Allow some parameters to be NULL if the length is 0.

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This change permits users of the ChaCha20/Poly1305 algorithms
(and the AEAD construction thereof) to pass NULL pointers for
data that they do not need, and avoids the need to provide a valid
buffer for data that is not used.
This commit is contained in:
Daniel King
2016-05-17 15:56:26 -03:00
committed by Manuel Pégourié-Gonnard
parent b8025c5826
commit a310c5e42b
6 changed files with 33 additions and 4 deletions
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7
library/chacha20.c
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@ -291,10 +291,15 @@ int mbedtls_chacha20_update( mbedtls_chacha20_context *ctx,
size_t offset = 0U;
size_t i;
if ( ( ctx == NULL ) || ( input == NULL ) || ( output == NULL ) )
if ( ctx == NULL )
{
return( MBEDTLS_ERR_CHACHA20_BAD_INPUT_DATA );
}
else if ( ( size > 0U ) && ( ( input == NULL ) || ( output == NULL ) ) )
{
/* input and output pointers are allowed to be NULL only if size == 0 */
return( MBEDTLS_ERR_CHACHA20_BAD_INPUT_DATA );
}
/* Use leftover keystream bytes, if available */
while ( ( size > 0U ) && ( ctx->keystream_bytes_used < CHACHA20_BLOCK_SIZE_BYTES ) )