ossl_ec_key_to_string  590 ext/openssl/ossl_pkey_ec.c     return ossl_ec_key_to_string(self, cipher, passwd, EXPORT_PEM);
ossl_ec_key_to_string  601 ext/openssl/ossl_pkey_ec.c     return ossl_ec_key_to_string(self, Qnil, Qnil, EXPORT_DER);