function do_associate($req)
{
// Performs the actions needed for openid.mode=associate. If
// srand was provided when constructing this server instance,
// this method supports the DH-SHA1 openid.session_type when
// requested. This function requires that $this->get_new_secret be
// overriden to function properly. Returns a Response object
// indicating what should be sent back to the consumer.
$reply = array();
$assoc_type = $req->get('openid.assoc_type', 'HMAC-SHA1');
$assoc = $this->estore->get($assoc_type);
$session_type = $req->get('session_type');
if ($session_type) {
if ($session_type == 'DH-SHA1') {
$p = $req->get('dh_modulus');
$g = $req->get('dh_gen');
$dh = DiffieHellman::fromBase64($p, $g, $this->srand);
$cpub = oidUtil::a2long(oidUtil::from_b64($req->get('dh_consumer_public')));
$dh_shared = $dh->decryptKeyExchange($cpub);
$mac_key = oidUtil::strxor($assoc->secret, oidUtil::sha1(oidUtil::long2a($dh_shared)));
$spub = $dh->createKeyExchange();
$reply['session_type'] = $session_type;
$reply['dh_server_public'] = oidUtil::to_b64(oidUtil::long2a($spub));
$reply['enc_mac_key'] = oidUtil::to_b64($mac_key);
// error_log( "assoc.secret: " . $assoc->secret );
// error_log( "dh_server_public: " . $reply['dh_server_public'] );
// error_log( "dh_server_public_raw: " . $spub );
// error_log( "enc_mac_key: " . $reply['enc_mac_key'] );
} else {
// raise ProtocolError('session_type must be DH-SHA1');
$error = 'session_type must be DH-SHA1';
return OpenIDServer::_error_page($error);
}
} else {
$reply['mac_key'] = oidUtil::to_b64($assoc->secret);
}
$reply['assoc_type'] = $assoc_type;
$reply['assoc_handle'] = $assoc->handle;
$reply['expires_in'] = $assoc->get_expires_in();
return response_page(oidUtil::kvform($reply));
}
