unsigned long ssl3_output_cert_chain(SSL *s, CERT_PKEY *cpk)
{
    unsigned char *p;
    unsigned long l = 3 + SSL_HM_HEADER_LENGTH(s);

    if (!ssl_add_cert_chain(s, cpk, &l))
        return 0;

    l -= 3 + SSL_HM_HEADER_LENGTH(s);
    p = ssl_handshake_start(s);
    l2n3(l, p);
    l += 3;

    if (!ssl_set_handshake_header(s, SSL3_MT_CERTIFICATE, l)) {
        SSLerr(SSL_F_SSL3_OUTPUT_CERT_CHAIN, ERR_R_INTERNAL_ERROR);
        return 0;
    }
    return l + SSL_HM_HEADER_LENGTH(s);
}