RSA_PKCS1_OpenSSL
if (rsa->engine != NULL || RSA_get_method(rsa) != RSA_PKCS1_OpenSSL())
ossl_rsa_meth = RSA_PKCS1_OpenSSL();
OSSL_DEPRECATEDIN_3_0 const RSA_METHOD *RSA_PKCS1_OpenSSL(void);