int rv = 0;

	EVP_PKEY *mac_key = EVP_PKEY_new_raw_private_key(EVP_PKEY_HMAC, NULL,
	                                                 (const unsigned char *)("0123456789"),
	                                                 strlen("0123456789"));

    rv = EVP_PKEY_cmp(mac_key, mac_key);
    if (rv != 1) {
        printf("key compare failed. rv = %d\n", rv);
        return 0;
    }
    printf("key compare passed\n");

@ -130,8 +130,14 @@ int EVP_PKEY_cmp(const EVP_PKEY *a, const EVP_PKEY *b)
                return ret;
        }

        if (a->ameth->pub_cmp)
            return a->ameth->pub_cmp(a, b);
        if (a->ameth->pub_cmp) {
            ret = a->ameth->pub_cmp(a, b);
            if (ret == 0) {
                return 1;
            } else {
                return 0;
            }
        }
    }