RSA_meth_set_sign
LCRYPTO_USED(RSA_meth_set_sign);
int RSA_meth_set_sign(RSA_METHOD *rsa, int (*sign)(int type,
LCRYPTO_ALIAS(RSA_meth_set_sign);
if (!RSA_meth_set_sign(sign_verify_method, rsa_method_app_data_sign))