OpenSSL::Timestamp::Request#algorithm

static VALUE
ossl_ts_req_get_algorithm(VALUE self)
{
    TS_REQ *req;
    TS_MSG_IMPRINT *mi;
    X509_ALGOR *algor;
    const ASN1_OBJECT *obj;

    GetTSRequest(self, req);
    mi = TS_REQ_get_msg_imprint(req);
    algor = TS_MSG_IMPRINT_get_algo(mi);
    X509_ALGOR_get0(&obj, NULL, NULL, algor);
    return ossl_asn1obj_to_string(obj);
}