Error out when get domain_parameters is not supported

From time being, domain_parameters could not be extracted
from driver. We need to return error to indicate this
situation. This is temporary and would be fixed after Mbed-TLS#6494.

Signed-off-by: Pengyu Lv <pengyu.lv@arm.com>

library/psa_crypto.c

@@ -1373,11 +1373,11 @@ psa_status_t psa_get_key_attributes(mbedtls_svc_key_id_t key,
 #endif /* MBEDTLS_PSA_CRYPTO_SE_C */
 
     switch (slot->attr.type) {
+        case PSA_KEY_TYPE_RSA_KEY_PAIR:
+        case PSA_KEY_TYPE_RSA_PUBLIC_KEY:
 #if (defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_RSA_KEY_PAIR_IMPORT) && \
     defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_RSA_KEY_PAIR_EXPORT)) || \
     defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_RSA_PUBLIC_KEY)
-        case PSA_KEY_TYPE_RSA_KEY_PAIR:
-        case PSA_KEY_TYPE_RSA_PUBLIC_KEY:
             /* TODO: reporting the public exponent for opaque keys
              * is not yet implemented.
              * https://github.com/ARMmbed/mbed-crypto/issues/216
@@ -1400,6 +1400,9 @@ psa_status_t psa_get_key_attributes(mbedtls_svc_key_id_t key,
                 mbedtls_free(rsa);
             }
             break;
+#else
+            attributes->domain_parameters = NULL;
+            attributes->domain_parameters_size = SIZE_MAX;
 #endif /* (defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_RSA_KEY_PAIR_IMPORT) && \
         * defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_RSA_KEY_PAIR_EXPORT)) ||
         * defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_RSA_PUBLIC_KEY) */

library/psa_crypto_client.c

@@ -53,6 +53,11 @@ psa_status_t psa_get_key_domain_parameters(
     const psa_key_attributes_t *attributes,
     uint8_t *data, size_t data_size, size_t *data_length)
 {
+    if (attributes->domain_parameters == NULL &&
+        attributes->domain_parameters_size == SIZE_MAX) {
+        return PSA_ERROR_NOT_SUPPORTED;
+    }
+
     if (attributes->domain_parameters_size > data_size) {
         return PSA_ERROR_BUFFER_TOO_SMALL;
     }