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Check return values from lower modules

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The cast to void was motivated by the assumption that the functions only
return non-zero when passed bad arguments, but that might not be true of
alternative implementation, for example on hardware failure.
This commit is contained in:
Manuel Pégourié-Gonnard 2018-05-24 18:43:42 +02:00
parent 1729789075
commit f4f01b6b7a
1 changed files with 48 additions and 29 deletions
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69
library/chachapoly.c
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@ -54,18 +54,19 @@
*
* \param ctx The ChaCha20-Poly1305 context.
*/
static void chachapoly_pad_aad( mbedtls_chachapoly_context *ctx )
static int chachapoly_pad_aad( mbedtls_chachapoly_context *ctx )
{
uint32_t partial_block_len = (uint32_t) ( ctx->aad_len % 16U );
unsigned char zeroes[15];
if( partial_block_len > 0U )
{
if( partial_block_len == 0U )
return( 0 );
memset( zeroes, 0, sizeof( zeroes ) );
(void) mbedtls_poly1305_update( &ctx->poly1305_ctx,
return( mbedtls_poly1305_update( &ctx->poly1305_ctx,
zeroes,
16U - partial_block_len );
}
16U - partial_block_len ) );
}
/**
@ -78,13 +79,13 @@ static void chachapoly_pad_ciphertext( mbedtls_chachapoly_context *ctx )
uint32_t partial_block_len = (uint32_t) ( ctx->ciphertext_len % 16U );
unsigned char zeroes[15];
if( partial_block_len > 0U )
{
if( partial_block_len == 0U )
return( 0 );
memset( zeroes, 0, sizeof( zeroes ) );
(void) mbedtls_poly1305_update( &ctx->poly1305_ctx,
return( mbedtls_poly1305_update( &ctx->poly1305_ctx,
zeroes,
16U - partial_block_len );
}
16U - partial_block_len ) );
}
void mbedtls_chachapoly_init( mbedtls_chachapoly_context *ctx )
@ -199,6 +200,8 @@ int mbedtls_chachapoly_update( mbedtls_chachapoly_context *ctx,
const unsigned char *input,
unsigned char *output )
{
int ret;
if( ctx == NULL )
{
return( MBEDTLS_ERR_POLY1305_BAD_INPUT_DATA );
@ -218,24 +221,32 @@ int mbedtls_chachapoly_update( mbedtls_chachapoly_context *ctx,
{
ctx->state = CHACHAPOLY_STATE_CIPHERTEXT;
chachapoly_pad_aad( ctx );
ret = chachapoly_pad_aad( ctx );
if( ret != 0 )
return( ret );
}
ctx->ciphertext_len += len;
if( ctx->mode == MBEDTLS_CHACHAPOLY_ENCRYPT )
{
/* Note: the following functions return an error only if one or more of
* the input pointers are NULL. Since we have checked their
* validity above, we can safety ignore the return value.
*/
(void) mbedtls_chacha20_update( &ctx->chacha20_ctx, len, input, output );
(void) mbedtls_poly1305_update( &ctx->poly1305_ctx, output, len );
ret = mbedtls_chacha20_update( &ctx->chacha20_ctx, len, input, output );
if( ret != 0 )
return( ret );
ret = mbedtls_poly1305_update( &ctx->poly1305_ctx, output, len );
if( ret != 0 )
return( ret );
}
else /* DECRYPT */
{
(void) mbedtls_poly1305_update( &ctx->poly1305_ctx, input, len );
(void) mbedtls_chacha20_update( &ctx->chacha20_ctx, len, input, output );
ret = mbedtls_poly1305_update( &ctx->poly1305_ctx, input, len );
if( ret != 0 )
return( ret );
ret = mbedtls_chacha20_update( &ctx->chacha20_ctx, len, input, output );
if( ret != 0 )
return( ret );
}
return( 0 );
@ -244,6 +255,7 @@ int mbedtls_chachapoly_update( mbedtls_chachapoly_context *ctx,
int mbedtls_chachapoly_finish( mbedtls_chachapoly_context *ctx,
unsigned char mac[16] )
{
int ret;
unsigned char len_block[16];
if( ( ctx == NULL ) || ( mac == NULL ) )
@ -257,11 +269,15 @@ int mbedtls_chachapoly_finish( mbedtls_chachapoly_context *ctx,
if( ctx->state == CHACHAPOLY_STATE_AAD )
{
chachapoly_pad_aad( ctx );
ret = chachapoly_pad_aad( ctx );
if( ret != 0 )
return( ret );
}
else if( ctx->state == CHACHAPOLY_STATE_CIPHERTEXT )
{
chachapoly_pad_ciphertext( ctx );
ret = chachapoly_pad_ciphertext( ctx );
if( ret != 0 )
return( ret );
}
ctx->state = CHACHAPOLY_STATE_FINISHED;
@ -286,10 +302,13 @@ int mbedtls_chachapoly_finish( mbedtls_chachapoly_context *ctx,
len_block[14] = (unsigned char)( ctx->ciphertext_len >> 48 );
len_block[15] = (unsigned char)( ctx->ciphertext_len >> 56 );
(void) mbedtls_poly1305_update( &ctx->poly1305_ctx, len_block, 16U );
(void) mbedtls_poly1305_finish( &ctx->poly1305_ctx, mac );
ret = mbedtls_poly1305_update( &ctx->poly1305_ctx, len_block, 16U );
if( ret != 0 )
return( ret );
return( 0 );
ret = mbedtls_poly1305_finish( &ctx->poly1305_ctx, mac );
return( ret );
}
int mbedtls_chachapoly_crypt_and_tag( mbedtls_chachapoly_context *ctx,