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Make psa_key_derivation_setup return early if the key agreement is not supported

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Otherwise the systematically generated algorithm-not-supported tests
complain when they try to start an operation and succeed.

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
This commit is contained in:
Gilles Peskine 2021-04-29 21:34:33 +02:00
parent ea0d95e27b
commit 739c98c5e8
1 changed files with 14 additions and 0 deletions
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14
library/psa_crypto.c
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@ -4414,6 +4414,16 @@ static psa_status_t psa_key_derivation_setup_kdf(
operation->capacity = 255 * hash_size; operation->capacity = 255 * hash_size;
return( PSA_SUCCESS ); return( PSA_SUCCESS );
} }
static psa_status_t psa_key_agreement_try_support( psa_algorithm_t alg )
{
#if defined(PSA_WANT_ALG_ECDH)
if( alg == PSA_ALG_ECDH )
return( PSA_SUCCESS );
#endif
(void) alg;
return( PSA_ERROR_NOT_SUPPORTED );
}
#endif /* AT_LEAST_ONE_BUILTIN_KDF */ #endif /* AT_LEAST_ONE_BUILTIN_KDF */
psa_status_t psa_key_derivation_setup( psa_key_derivation_operation_t *operation, psa_status_t psa_key_derivation_setup( psa_key_derivation_operation_t *operation,
@ -4430,6 +4440,10 @@ psa_status_t psa_key_derivation_setup( psa_key_derivation_operation_t *operation
{ {
#if defined(AT_LEAST_ONE_BUILTIN_KDF) #if defined(AT_LEAST_ONE_BUILTIN_KDF)
psa_algorithm_t kdf_alg = PSA_ALG_KEY_AGREEMENT_GET_KDF( alg ); psa_algorithm_t kdf_alg = PSA_ALG_KEY_AGREEMENT_GET_KDF( alg );
psa_algorithm_t ka_alg = PSA_ALG_KEY_AGREEMENT_GET_BASE( alg );
status = psa_key_agreement_try_support( ka_alg );
if( status != PSA_SUCCESS )
return( status );
status = psa_key_derivation_setup_kdf( operation, kdf_alg ); status = psa_key_derivation_setup_kdf( operation, kdf_alg );
#else #else
return( PSA_ERROR_NOT_SUPPORTED ); return( PSA_ERROR_NOT_SUPPORTED );