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Add output parameter to mbedtls_gcm_finish

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Alternative implementations of GCM may delay the output of partial
blocks from mbedtls_gcm_update(). Add an output parameter to
mbedtls_gcm_finish() to allow such implementations to pass the final
partial block back to the caller. With the software implementation,
this final output is always empty.

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
This commit is contained in:
Gilles Peskine
2021-04-15 16:48:32 +02:00
parent 441907ec30
commit 9461e45a17
5 changed files with 37 additions and 10 deletions
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2
library/cipher.c
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@ -1101,6 +1101,7 @@ int mbedtls_cipher_write_tag( mbedtls_cipher_context_t *ctx,
#if defined(MBEDTLS_GCM_C)
if( MBEDTLS_MODE_GCM == ctx->cipher_info->mode )
return( mbedtls_gcm_finish( (mbedtls_gcm_context *) ctx->cipher_ctx,
NULL, 0,
tag, tag_len ) );
#endif
@ -1153,6 +1154,7 @@ int mbedtls_cipher_check_tag( mbedtls_cipher_context_t *ctx,
if( 0 != ( ret = mbedtls_gcm_finish(
(mbedtls_gcm_context *) ctx->cipher_ctx,
NULL, 0,
check_tag, tag_len ) ) )
{
return( ret );