test: remove usage of mbedtls_pk_wrap_as_opaque() from tests

This is replaced with: mbedtls_pk_get_psa_attributes() +
mbedtls_pk_import_into_psa() + mbedtls_pk_setup_opaque().

Signed-off-by: Valerio Setti <valerio.setti@nordicsemi.no>
diff --git a/tests/suites/test_suite_x509write.function b/tests/suites/test_suite_x509write.function
index 3d84c72..1db7e1c 100644
--- a/tests/suites/test_suite_x509write.function
+++ b/tests/suites/test_suite_x509write.function
@@ -284,7 +284,7 @@
 {
     mbedtls_pk_context key;
     mbedtls_svc_key_id_t key_id = MBEDTLS_SVC_KEY_ID_INIT;
-    psa_algorithm_t md_alg_psa, alg_psa;
+    psa_key_attributes_t key_attr = PSA_KEY_ATTRIBUTES_INIT;
     mbedtls_x509write_csr req;
     unsigned char buf[4096];
     int ret;
@@ -297,24 +297,16 @@
 
     memset(&rnd_info, 0x2a, sizeof(mbedtls_test_rnd_pseudo_info));
 
-    md_alg_psa = mbedtls_md_psa_alg_from_type((mbedtls_md_type_t) md_type);
-    TEST_ASSERT(md_alg_psa != MBEDTLS_MD_NONE);
-
     mbedtls_pk_init(&key);
     TEST_ASSERT(mbedtls_pk_parse_keyfile(&key, key_file, NULL,
                                          mbedtls_test_rnd_std_rand, NULL) == 0);
 
-    if (mbedtls_pk_get_type(&key) == MBEDTLS_PK_ECKEY) {
-        alg_psa = PSA_ALG_ECDSA(md_alg_psa);
-    } else if (mbedtls_pk_get_type(&key) == MBEDTLS_PK_RSA) {
-        alg_psa = PSA_ALG_RSA_PKCS1V15_SIGN(md_alg_psa);
-    } else {
-        TEST_ASSUME(!"PK key type not supported in this configuration");
-    }
-
-    TEST_ASSERT(mbedtls_pk_wrap_as_opaque(&key, &key_id, alg_psa,
-                                          PSA_KEY_USAGE_SIGN_HASH,
-                                          PSA_ALG_NONE) == 0);
+    /* Turn the PK context into an opaque one. */
+    TEST_EQUAL(mbedtls_pk_get_psa_attributes(&key, PSA_KEY_USAGE_SIGN_HASH, &key_attr), 0);
+    TEST_EQUAL(mbedtls_pk_import_into_psa(&key, &key_attr, &key_id), 0);
+    mbedtls_pk_free(&key);
+    mbedtls_pk_init(&key);
+    TEST_EQUAL(mbedtls_pk_setup_opaque(&key, key_id), 0);
 
     mbedtls_x509write_csr_set_md_alg(&req, md_type);
     mbedtls_x509write_csr_set_key(&req, &key);
@@ -373,6 +365,7 @@
     mbedtls_test_rnd_pseudo_info rnd_info;
 #if defined(MBEDTLS_USE_PSA_CRYPTO)
     mbedtls_svc_key_id_t key_id = MBEDTLS_SVC_KEY_ID_INIT;
+    psa_key_attributes_t key_attr = PSA_KEY_ATTRIBUTES_INIT;
 #endif
     mbedtls_pk_type_t issuer_key_type;
     mbedtls_x509_san_list san_ip;
@@ -451,24 +444,14 @@
 #endif
 
 #if defined(MBEDTLS_USE_PSA_CRYPTO)
-    /* For Opaque PK contexts, wrap key as an Opaque RSA context. */
+    /* Turn the issuer PK context into an opaque one. */
     if (pk_wrap == 2) {
-        psa_algorithm_t alg_psa, md_alg_psa;
-
-        md_alg_psa = mbedtls_md_psa_alg_from_type((mbedtls_md_type_t) md_type);
-        TEST_ASSERT(md_alg_psa != MBEDTLS_MD_NONE);
-
-        if (mbedtls_pk_get_type(&issuer_key) == MBEDTLS_PK_ECKEY) {
-            alg_psa = PSA_ALG_ECDSA(md_alg_psa);
-        } else if (mbedtls_pk_get_type(&issuer_key) == MBEDTLS_PK_RSA) {
-            alg_psa = PSA_ALG_RSA_PKCS1V15_SIGN(md_alg_psa);
-        } else {
-            TEST_ASSUME(!"PK key type not supported in this configuration");
-        }
-
-        TEST_ASSERT(mbedtls_pk_wrap_as_opaque(&issuer_key, &key_id, alg_psa,
-                                              PSA_KEY_USAGE_SIGN_HASH,
-                                              PSA_ALG_NONE) == 0);
+        TEST_EQUAL(mbedtls_pk_get_psa_attributes(&issuer_key, PSA_KEY_USAGE_SIGN_HASH,
+                                                 &key_attr), 0);
+        TEST_EQUAL(mbedtls_pk_import_into_psa(&issuer_key, &key_attr, &key_id), 0);
+        mbedtls_pk_free(&issuer_key);
+        mbedtls_pk_init(&issuer_key);
+        TEST_EQUAL(mbedtls_pk_setup_opaque(&issuer_key, key_id), 0);
     }
 #endif /* MBEDTLS_USE_PSA_CRYPTO */