OSSL_ASYM_CIPHER_PARAM_OAEP_DIGEST_PROPS
OSSL_ASYM_CIPHER_PARAM_OAEP_DIGEST_PROPS, mdprops);
*p++ = OSSL_PARAM_construct_utf8_string(OSSL_ASYM_CIPHER_PARAM_OAEP_DIGEST_PROPS,
OSSL_ASYM_CIPHER_PARAM_OAEP_DIGEST_PROPS);
OSSL_PARAM_utf8_string(OSSL_ASYM_CIPHER_PARAM_OAEP_DIGEST_PROPS, NULL, 0),