OpenSSL::Timestamp::Response#tsa_certificate

static VALUE
ossl_ts_resp_get_tsa_certificate(VALUE self)
{
    TS_RESP *resp;
    PKCS7 *p7;
    PKCS7_SIGNER_INFO *ts_info;
    const X509 *cert;

    GetTSResponse(self, resp);
    if (!(p7 = TS_RESP_get_token(resp)))
        return Qnil;
    ts_info = sk_PKCS7_SIGNER_INFO_value(p7->d.sign->signer_info, 0);
    cert = PKCS7_cert_from_signer_info(p7, ts_info);
    if (!cert)
        return Qnil;
    return ossl_x509_new(cert);
}