RSA_set_method
RSA_set_method(rsa, &kc_rsa_pkcs1_method);
RSA_set_method(rsa, meth);
OSSL_DEPRECATEDIN_3_0 int RSA_set_method(RSA *rsa, const RSA_METHOD *meth);
|| !TEST_int_gt(RSA_set_method(rsa, rsa_meth), 0)