diff --git a/tests/suites/test_suite_pk.function b/tests/suites/test_suite_pk.function
index 5255febb72..226598c724 100644
--- a/tests/suites/test_suite_pk.function
+++ b/tests/suites/test_suite_pk.function
@@ -84,25 +84,25 @@ exit:
 
 /** Generate a key of the desired type.
  *
- * \param pk        The PK object to fill. It must have been initialized
- *                  with mbedtls_pk_setup().
- * \param parameter - For RSA keys, the key size in bits.
- *                  - For EC keys, the curve (\c MBEDTLS_ECP_DP_xxx).
+ * \param pk               The PK object to fill. It must have been initialized
+ *                         with mbedtls_pk_setup().
+ * \param curve_or_keybits - For RSA keys, the key size in bits.
+ *                         - For EC keys, the curve (\c MBEDTLS_ECP_DP_xxx).
  *
- * \return          The status from the underlying type-specific key
- *                  generation function.
- * \return          -1 if the key type is not recognized.
+ * \return                 The status from the underlying type-specific key
+ *                         generation function.
+ * \return                 -1 if the key type is not recognized.
  */
-static int pk_genkey(mbedtls_pk_context *pk, int parameter)
+static int pk_genkey(mbedtls_pk_context *pk, int curve_or_keybits)
 {
-    ((void) pk);
-    (void) parameter;
+    (void) pk;
+    (void) curve_or_keybits;
 
 #if defined(MBEDTLS_RSA_C) && defined(MBEDTLS_GENPRIME)
     if (mbedtls_pk_get_type(pk) == MBEDTLS_PK_RSA) {
         return mbedtls_rsa_gen_key(mbedtls_pk_rsa(*pk),
                                    mbedtls_test_rnd_std_rand, NULL,
-                                   parameter, 3);
+                                   curve_or_keybits, 3);
     }
 #endif
 #if defined(MBEDTLS_PK_HAVE_ECC_KEYS)
@@ -112,7 +112,7 @@ static int pk_genkey(mbedtls_pk_context *pk, int parameter)
         int ret;
 
 #if defined(MBEDTLS_ECP_C)
-        ret = mbedtls_ecp_group_load(&mbedtls_pk_ec_rw(*pk)->grp, parameter);
+        ret = mbedtls_ecp_group_load(&mbedtls_pk_ec_rw(*pk)->grp, curve_or_keybits);
         if (ret != 0) {
             return ret;
         }
@@ -123,7 +123,7 @@ static int pk_genkey(mbedtls_pk_context *pk, int parameter)
 #endif /* MBEDTLS_ECP_C */
 
 #if defined(MBEDTLS_PK_USE_PSA_EC_DATA)
-        ret = pk_genkey_ec(pk, parameter);
+        ret = pk_genkey_ec(pk, curve_or_keybits);
         if (ret != 0) {
             return ret;
         }
@@ -319,7 +319,7 @@ exit:
 
 /* BEGIN_CASE depends_on:MBEDTLS_USE_PSA_CRYPTO */
 void pk_can_do_ext(int opaque_key, int key_type, int key_usage, int key_alg,
-                   int key_alg2, int parameter, int alg_check, int usage_check,
+                   int key_alg2, int curve_or_keybits, int alg_check, int usage_check,
                    int result)
 {
     mbedtls_pk_context pk;
@@ -336,7 +336,7 @@ void pk_can_do_ext(int opaque_key, int key_type, int key_usage, int key_alg,
             psa_set_key_enrollment_algorithm(&attributes, key_alg2);
         }
         psa_set_key_type(&attributes, key_type);
-        psa_set_key_bits(&attributes, parameter);
+        psa_set_key_bits(&attributes, curve_or_keybits);
 
         PSA_ASSERT(psa_generate_key(&attributes, &key));
 
@@ -350,7 +350,7 @@ void pk_can_do_ext(int opaque_key, int key_type, int key_usage, int key_alg,
     } else {
         TEST_EQUAL(mbedtls_pk_setup(&pk,
                                     mbedtls_pk_info_from_type(key_type)), 0);
-        TEST_EQUAL(pk_genkey(&pk, parameter), 0);
+        TEST_EQUAL(pk_genkey(&pk, curve_or_keybits), 0);
         TEST_EQUAL(mbedtls_pk_get_type(&pk), key_type);
     }
 
@@ -545,7 +545,7 @@ exit:
 /* END_CASE */
 
 /* BEGIN_CASE */
-void pk_utils(int type, int parameter, int bitlen, int len, char *name)
+void pk_utils(int type, int curve_or_keybits, int bitlen, int len, char *name)
 {
     mbedtls_pk_context pk;
 
@@ -553,7 +553,7 @@ void pk_utils(int type, int parameter, int bitlen, int len, char *name)
     USE_PSA_INIT();
 
     TEST_ASSERT(mbedtls_pk_setup(&pk, mbedtls_pk_info_from_type(type)) == 0);
-    TEST_ASSERT(pk_genkey(&pk, parameter) == 0);
+    TEST_ASSERT(pk_genkey(&pk, curve_or_keybits) == 0);
 
     TEST_ASSERT((int) mbedtls_pk_get_type(&pk) == type);
     TEST_ASSERT(mbedtls_pk_can_do(&pk, type));
@@ -857,7 +857,7 @@ exit:
 /* END_CASE */
 
 /* BEGIN_CASE depends_on:MBEDTLS_MD_CAN_SHA256 */
-void pk_sign_verify(int type, int parameter, int sign_ret, int verify_ret)
+void pk_sign_verify(int type, int curve_or_keybits, int sign_ret, int verify_ret)
 {
     mbedtls_pk_context pk;
     size_t sig_len;
@@ -883,7 +883,7 @@ void pk_sign_verify(int type, int parameter, int sign_ret, int verify_ret)
     memset(sig, 0, sizeof(sig));
 
     TEST_ASSERT(mbedtls_pk_setup(&pk, mbedtls_pk_info_from_type(type)) == 0);
-    TEST_ASSERT(pk_genkey(&pk, parameter) == 0);
+    TEST_ASSERT(pk_genkey(&pk, curve_or_keybits) == 0);
 
     TEST_ASSERT(mbedtls_pk_sign_restartable(&pk, MBEDTLS_MD_SHA256,
                                             hash, hash_len,
@@ -1304,8 +1304,7 @@ exit:
 /* END_CASE */
 
 /* BEGIN_CASE depends_on:MBEDTLS_MD_CAN_SHA256:MBEDTLS_USE_PSA_CRYPTO:MBEDTLS_TEST_PK_PSA_SIGN */
-void pk_psa_sign(int parameter_arg,
-                 int psa_type_arg, int expected_bits_arg)
+void pk_psa_sign(int curve_or_keybits, int psa_type, int expected_bits)
 {
     mbedtls_pk_context pk;
     unsigned char hash[32];
@@ -1318,8 +1317,6 @@ void pk_psa_sign(int parameter_arg,
     int ret;
     mbedtls_svc_key_id_t key_id;
     psa_key_attributes_t attributes = PSA_KEY_ATTRIBUTES_INIT;
-    psa_key_type_t expected_type = psa_type_arg;
-    size_t expected_bits = expected_bits_arg;
 
     /*
      * This tests making signatures with a wrapped PSA key:
@@ -1333,19 +1330,19 @@ void pk_psa_sign(int parameter_arg,
     USE_PSA_INIT();
 
 #if defined(MBEDTLS_RSA_C) && defined(MBEDTLS_GENPRIME)
-    if (PSA_KEY_TYPE_IS_RSA(psa_type_arg)) {
+    if (PSA_KEY_TYPE_IS_RSA(psa_type)) {
         /* Create legacy RSA public/private key in PK context. */
         TEST_ASSERT(mbedtls_pk_setup(&pk,
                                      mbedtls_pk_info_from_type(MBEDTLS_PK_RSA)) == 0);
         TEST_ASSERT(mbedtls_rsa_gen_key(mbedtls_pk_rsa(pk),
                                         mbedtls_test_rnd_std_rand, NULL,
-                                        parameter_arg, 3) == 0);
+                                        curve_or_keybits, 3) == 0);
         alg_psa = PSA_ALG_RSA_PKCS1V15_SIGN(PSA_ALG_SHA_256);
     } else
 #endif /* MBEDTLS_RSA_C && MBEDTLS_GENPRIME */
 #if defined(MBEDTLS_PK_CAN_ECDSA_SIGN)
-    if (PSA_KEY_TYPE_IS_ECC_KEY_PAIR(psa_type_arg)) {
-        mbedtls_ecp_group_id grpid = parameter_arg;
+    if (PSA_KEY_TYPE_IS_ECC_KEY_PAIR(psa_type)) {
+        mbedtls_ecp_group_id grpid = curve_or_keybits;
 
         /* Create legacy EC public/private key in PK context. */
         TEST_ASSERT(mbedtls_pk_setup(&pk,
@@ -1356,7 +1353,7 @@ void pk_psa_sign(int parameter_arg,
     } else
 #endif /* MBEDTLS_PK_CAN_ECDSA_SIGN */
     {
-        (void) parameter_arg;
+        (void) curve_or_keybits;
         TEST_ASSUME(!"Opaque PK key not supported in this configuration");
     }
 
@@ -1384,8 +1381,8 @@ void pk_psa_sign(int parameter_arg,
                                           PSA_ALG_NONE) == 0);
 
     PSA_ASSERT(psa_get_key_attributes(key_id, &attributes));
-    TEST_EQUAL(psa_get_key_type(&attributes), expected_type);
-    TEST_EQUAL(psa_get_key_bits(&attributes), expected_bits);
+    TEST_EQUAL(psa_get_key_type(&attributes), (psa_key_type_t) psa_type);
+    TEST_EQUAL(psa_get_key_bits(&attributes), (size_t) expected_bits);
     TEST_EQUAL(psa_get_key_lifetime(&attributes),
                PSA_KEY_LIFETIME_VOLATILE);
 
@@ -1396,7 +1393,7 @@ void pk_psa_sign(int parameter_arg,
                                 hash, sizeof(hash), sig, sizeof(sig), &sig_len,
                                 NULL, NULL) == 0);
     /* Only opaque EC keys support verification. */
-    if (PSA_KEY_TYPE_IS_ECC_KEY_PAIR(psa_type_arg)) {
+    if (PSA_KEY_TYPE_IS_ECC_KEY_PAIR(psa_type)) {
         TEST_ASSERT(mbedtls_pk_verify(&pk, MBEDTLS_MD_SHA256,
                                       hash, sizeof(hash), sig, sig_len) == 0);
     }
@@ -1438,7 +1435,7 @@ void pk_psa_sign(int parameter_arg,
                                 mbedtls_pk_info_from_type(MBEDTLS_PK_ECKEY)), 0);
     TEST_EQUAL(mbedtls_ecp_group_load(
                    &(mbedtls_pk_ec_rw(pk)->grp),
-                   (mbedtls_ecp_group_id) parameter_arg), 0);
+                   (mbedtls_ecp_group_id) curve_or_keybits), 0);
     TEST_EQUAL(mbedtls_ecp_point_read_binary(&(mbedtls_pk_ec_ro(pk)->grp),
                                              &(mbedtls_pk_ec_rw(pk)->Q),
                                              pkey_legacy_start, klen_legacy), 0);
@@ -1459,9 +1456,8 @@ exit:
 /* END_CASE */
 
 /* BEGIN_CASE depends_on:MBEDTLS_GENPRIME */
-void pk_sign_ext(int pk_type, int parameter, int key_pk_type, int md_alg)
+void pk_sign_ext(int pk_type, int curve_or_keybits, int key_pk_type, int md_alg)
 {
-    /* See the description of pk_genkey() for the description of the `parameter` argument. */
     mbedtls_pk_context pk;
     size_t sig_len;
     unsigned char sig[MBEDTLS_PK_SIGNATURE_MAX_SIZE];
@@ -1477,7 +1473,7 @@ void pk_sign_ext(int pk_type, int parameter, int key_pk_type, int md_alg)
 
     TEST_EQUAL(mbedtls_pk_setup(&pk,
                                 mbedtls_pk_info_from_type(pk_type)), 0);
-    TEST_EQUAL(pk_genkey(&pk, parameter), 0);
+    TEST_EQUAL(pk_genkey(&pk, curve_or_keybits), 0);
 
     TEST_EQUAL(mbedtls_pk_sign_ext(key_pk_type, &pk, md_alg, hash, hash_len,
                                    sig, sizeof(sig), &sig_len,
@@ -1498,9 +1494,8 @@ exit:
 /* END_CASE */
 
 /* BEGIN_CASE depends_on:MBEDTLS_RSA_C:MBEDTLS_GENPRIME:MBEDTLS_USE_PSA_CRYPTO */
-void pk_psa_wrap_sign_ext(int pk_type, int parameter, int key_pk_type, int md_alg)
+void pk_psa_wrap_sign_ext(int pk_type, int key_bits, int key_pk_type, int md_alg)
 {
-    /* See the description of mbedtls_rsa_gen_key() for the description of the `parameter` argument. */
     mbedtls_pk_context pk;
     size_t sig_len, pkey_len;
     mbedtls_svc_key_id_t key_id;
@@ -1524,7 +1519,7 @@ void pk_psa_wrap_sign_ext(int pk_type, int parameter, int key_pk_type, int md_al
                                 mbedtls_pk_info_from_type(pk_type)), 0);
     TEST_EQUAL(mbedtls_rsa_gen_key(mbedtls_pk_rsa(pk),
                                    mbedtls_test_rnd_std_rand, NULL,
-                                   parameter, 3), 0);
+                                   key_bits, 3), 0);
 
     /* Export underlying public key for re-importing in a legacy context. */
     ret = mbedtls_pk_write_pubkey_der(&pk, pkey, sizeof(pkey));