OSSL_PKEY_PARAM_ENGINE
*p++ = OSSL_PARAM_construct_utf8_string(OSSL_PKEY_PARAM_ENGINE,
# define OSSL_ASYM_CIPHER_PARAM_ENGINE OSSL_PKEY_PARAM_ENGINE
OSSL_PKEY_PARAM_ENGINE,
OSSL_PARAM_utf8_string(OSSL_PKEY_PARAM_ENGINE, NULL, 0),
OSSL_PARAM_utf8_string(OSSL_PKEY_PARAM_ENGINE, NULL, 0),