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psa_hmac_setup_internal: fix double call of psa_hash_setup

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In the common case (key no longer than the block size), psa_hash_setup
was being called twice in succession. With current implementations
this is just a small performance loss, but potentially with
alternative implementations this could have lead to a memory leak.
This commit is contained in:
Gilles Peskine 2018-07-17 16:22:47 +02:00 committed by itayzafrir
parent ff94abdf3a
commit 1e6bfdff5e
1 changed files with 3 additions and 4 deletions
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7
library/psa_crypto.c
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@ -1424,12 +1424,11 @@ static psa_status_t psa_hmac_setup_internal( psa_hmac_internal_data *hmac,
if( block_size == 0 )
return( PSA_ERROR_NOT_SUPPORTED );
status = psa_hash_setup( &hmac->hash_ctx, hash_alg );
if( status != PSA_SUCCESS )
return( status );
if( key_length > block_size )
{
status = psa_hash_setup( &hmac->hash_ctx, hash_alg );
if( status != PSA_SUCCESS )
goto cleanup;
status = psa_hash_update( &hmac->hash_ctx, key, key_length );
if( status != PSA_SUCCESS )
goto cleanup;