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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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6
include/mbedtls/aead_chacha20_poly1305.h
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@ -124,6 +124,7 @@ int mbedtls_aead_chacha20_poly1305_starts( mbedtls_aead_chacha20_poly1305_contex
* \param aad_len The length (in bytes) of the AAD. The length has no
* restrictions.
* \param aad Buffer containing the AAD.
* This pointer can be NULL if aad_len == 0.
*
* \return MBEDTLS_ERR_AEAD_CHACHA20_POLY1305_BAD_INPUT_DATA is returned
* if \p ctx or \p aad are NULL.
@ -151,7 +152,9 @@ int mbedtls_aead_chacha20_poly1305_update_aad( mbedtls_aead_chacha20_poly1305_co
* \param ctx The ChaCha20-Poly1305 context.
* \param len The length (in bytes) of the data to encrypt or decrypt.
* \param input Buffer containing the data to encrypt or decrypt.
* This pointer can be NULL if len == 0.
* \param output Buffer to where the encrypted or decrypted data is written.
* This pointer can be NULL if len == 0.
*
* \return MBEDTLS_ERR_AEAD_CHACHA20_POLY1305_BAD_INPUT_DATA is returned
* if \p ctx, \p input, or \p output are NULL.
@ -195,9 +198,12 @@ int mbedtls_aead_chacha20_poly1305_finish( mbedtls_aead_chacha20_poly1305_contex
* parameter does not matter.
* \param aad_len The length (in bytes) of the AAD data to process.
* \param aad Buffer containing the additional authenticated data (AAD).
* This pointer can be NULL if aad_len == 0.
* \param ilen The length (in bytes) of the data to encrypt or decrypt.
* \param input Buffer containing the data to encrypt or decrypt.
* This pointer can be NULL if ilen == 0.
* \param output Buffer to where the encrypted or decrypted data is written.
* This pointer can be NULL if ilen == 0.
* \param mac Buffer to where the computed 128-bit (16 bytes) MAC is written.
*
* \return MBEDTLS_ERR_AEAD_CHACHA20_POLY1305_BAD_INPUT_DATA is returned

2
include/mbedtls/chacha20.h
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@ -136,7 +136,9 @@ int mbedtls_chacha20_keystream_block( const mbedtls_chacha20_context *ctx,
* \param ctx The ChaCha20 context.
* \param size The length (in bytes) to process. This can have any length.
* \param input Buffer containing the input data.
* This pointer can be NULL if size == 0.
* \param output Buffer containing the output data.
* This pointer can be NULL if size == 0.
*
* \return MBEDTLS_ERR_CHACHA20_BAD_INPUT_DATA if the ctx, input, or
* output pointers are NULL.

1
include/mbedtls/poly1305.h
View File

@ -85,6 +85,7 @@ int mbedtls_poly1305_setkey( mbedtls_poly1305_context *ctx,
* \param ctx The Poly1305 context.
* \param ilen The input length (in bytes). Any value is accepted.
* \param input Buffer containing the input data to Process.
* This pointer can be NULL if ilen == 0.
*
* \return MBEDTLS_ERR_POLY1305_BAD_INPUT_DATA is returned if ctx
* or input are NULL.

12
library/aead_chacha20_poly1305.c
View File

@ -174,10 +174,15 @@ int mbedtls_aead_chacha20_poly1305_update_aad( mbedtls_aead_chacha20_poly1305_co
size_t aad_len,
const unsigned char *aad )
{
if ( ( ctx == NULL ) || ( aad == NULL ) )
if ( ctx == NULL )
{
return( MBEDTLS_ERR_AEAD_CHACHA20_POLY1305_BAD_INPUT_DATA );
}
else if ( ( aad_len > 0U ) && ( aad == NULL ) )
{
/* aad pointer is allowed to be NULL if aad_len == 0 */
return( MBEDTLS_ERR_AEAD_CHACHA20_POLY1305_BAD_INPUT_DATA );
}
else if ( ctx->state != AEAD_CHACHA20_POLY1305_STATE_AAD )
{
return (MBEDTLS_ERR_AEAD_CHACHA20_POLY1305_BAD_STATE );
@ -197,6 +202,11 @@ int mbedtls_aead_chacha20_poly1305_update( mbedtls_aead_chacha20_poly1305_contex
{
return( MBEDTLS_ERR_AEAD_CHACHA20_POLY1305_BAD_INPUT_DATA );
}
else if ( ( len > 0U ) && ( ( input == NULL ) || ( output == NULL ) ) )
{
/* input and output pointers are allowed to be NULL if len == 0 */
return( MBEDTLS_ERR_AEAD_CHACHA20_POLY1305_BAD_INPUT_DATA );
}
else if ( ( ctx->state != AEAD_CHACHA20_POLY1305_STATE_AAD ) &&
( ctx->state != AEAD_CHACHA20_POLY1305_STATE_CIPHERTEXT ) )
{

7
library/chacha20.c
View File

@ -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 ) )

9
library/poly1305.c
View File

@ -293,12 +293,17 @@ int mbedtls_poly1305_update( mbedtls_poly1305_context *ctx,
size_t queue_free_len;
size_t nblocks;
if ( ( ctx == NULL ) || ( input == NULL ) )
if ( ctx == NULL )
{
return( MBEDTLS_ERR_POLY1305_BAD_INPUT_DATA );
}
else if ( ( ilen > 0U ) && ( input == NULL ) )
{
/* input pointer is allowed to be NULL only if ilen == 0 */
return( MBEDTLS_ERR_POLY1305_BAD_INPUT_DATA );
}
if ( ctx->queue_len > 0U )
if ( ( remaining > 0U ) && ( ctx->queue_len > 0U ) )
{
queue_free_len = ( POLY1305_BLOCK_SIZE_BYTES - ctx->queue_len );