construct_kbkdf_params
params = construct_kbkdf_params("blah", "HMAC", key, 1, "prf", "test", &r);
params = construct_kbkdf_params("sha256", "blah", key, 1, "prf", "test", &r);
params = construct_kbkdf_params("sha256", "HMAC", key, 1, "prf", "test", &r);
params = construct_kbkdf_params("sha256", "HMAC", key, 0, "prf", "test", &r);
params = construct_kbkdf_params("sha256", "HMAC", key, 1, "prf", "test", &r);
params = construct_kbkdf_params("sha256", "HMAC", key, 1, "prf", "test", &r);