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cipher: handle ChaCha20 as a stream cipher

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That's what it is. So we shouldn't set a block size != 1.

While at it, move call to chachapoly_update() closer to the one for GCM, as
they are similar (AEAD).
This commit is contained in:
Manuel Pégourié-Gonnard 2018-05-10 12:30:19 +02:00
parent c0dfcd4bf1
commit 32902e6eae
3 changed files with 27 additions and 30 deletions
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34
library/cipher.c
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@ -367,6 +367,15 @@ int mbedtls_cipher_update( mbedtls_cipher_context_t *ctx, const unsigned char *i
}
#endif
#if defined(MBEDTLS_CHACHAPOLY_C)
if ( ctx->cipher_info->type == MBEDTLS_CIPHER_CHACHA20_POLY1305 )
{
*olen = ilen;
return mbedtls_chachapoly_update( (mbedtls_chachapoly_context*) ctx->cipher_ctx,
ilen, input, output );
}
#endif
if ( 0 == block_size )
{
return MBEDTLS_ERR_CIPHER_INVALID_CONTEXT;
@ -378,31 +387,6 @@ int mbedtls_cipher_update( mbedtls_cipher_context_t *ctx, const unsigned char *i
return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
}
#if defined(MBEDTLS_CHACHA20_C)
if ( ctx->cipher_info->type == MBEDTLS_CIPHER_CHACHA20 )
{
*olen = ilen;
return mbedtls_chacha20_update( (mbedtls_chacha20_context*) ctx->cipher_ctx,
ilen, input, output );
}
#endif
if( input == output &&
( ctx->unprocessed_len != 0 || ilen % mbedtls_cipher_get_block_size( ctx ) ) )
{
return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
}
#if defined(MBEDTLS_CHACHAPOLY_C)
if ( ctx->cipher_info->type == MBEDTLS_CIPHER_CHACHA20_POLY1305 )
{
*olen = ilen;
return mbedtls_chachapoly_update( (mbedtls_chachapoly_context*) ctx->cipher_ctx,
ilen, input, output );
}
#endif
#if defined(MBEDTLS_CIPHER_MODE_CBC)
if( ctx->cipher_info->mode == MBEDTLS_MODE_CBC )
{