cryptlib.php

<?php
/*
	From phpSecLib - Comments and most line breaks/spacing removed to save
	space
*/
define('CRYPT_RIJNDAEL_MODE_CTR', -1);
define('CRYPT_RIJNDAEL_MODE_ECB', 1);
define('CRYPT_RIJNDAEL_MODE_CBC', 2);
define('CRYPT_RIJNDAEL_MODE_CFB', 3);
define('CRYPT_RIJNDAEL_MODE_OFB', 4);
define('CRYPT_RIJNDAEL_MODE_INTERNAL', 1);

define('CRYPT_RIJNDAEL_MODE_MCRYPT', 2);

class Crypt_Rijndael {
var $mode;

var $key="\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0";

var $iv='';

var $encryptIV='';

var $decryptIV='';

var $continuousBuffer=false;

var $padding=true;

var $changed=true;

var $explicit_key_length=false;

var $w;

var $dw;

var $block_size=16;

var $Nb=4;

var $key_size=16;

var $Nk=4;

var $Nr;

var $c;

var $t0;

var $t1;
var $t2;
var $t3;
var $dt0;
var $dt1;
var $dt2;
var $dt3;
var $paddable=false;
var $enbuffer=array('encrypted' => '', 'xor' => '');
var $debuffer=array('ciphertext' => '');
function Crypt_Rijndael($mode=CRYPT_RIJNDAEL_MODE_CBC)
{
switch ($mode) {
case CRYPT_RIJNDAEL_MODE_ECB:
case CRYPT_RIJNDAEL_MODE_CBC:
$this->paddable=true;
$this->mode=$mode;
break;
case CRYPT_RIJNDAEL_MODE_CTR:
case CRYPT_RIJNDAEL_MODE_CFB:
case CRYPT_RIJNDAEL_MODE_OFB:
$this->mode=$mode;
break;
default:
$this->paddable=true;
$this->mode=CRYPT_RIJNDAEL_MODE_CBC;
}

$t3=&$this->t3;
$t2=&$this->t2;
$t1=&$this->t1;
$t0=&$this->t0;

$dt3=&$this->dt3;
$dt2=&$this->dt2;
$dt1=&$this->dt1;
$dt0=&$this->dt0;
$t3=array(
0x6363A5C6, 0x7C7C84F8, 0x777799EE, 0x7B7B8DF6, 0xF2F20DFF, 0x6B6BBDD6, 0x6F6FB1DE, 0xC5C55491, 
0x30305060, 0x01010302, 0x6767A9CE, 0x2B2B7D56, 0xFEFE19E7, 0xD7D762B5, 0xABABE64D, 0x76769AEC, 
0xCACA458F, 0x82829D1F, 0xC9C94089, 0x7D7D87FA, 0xFAFA15EF, 0x5959EBB2, 0x4747C98E, 0xF0F00BFB, 
0xADADEC41, 0xD4D467B3, 0xA2A2FD5F, 0xAFAFEA45, 0x9C9CBF23, 0xA4A4F753, 0x727296E4, 0xC0C05B9B, 
0xB7B7C275, 0xFDFD1CE1, 0x9393AE3D, 0x26266A4C, 0x36365A6C, 0x3F3F417E, 0xF7F702F5, 0xCCCC4F83, 
0x34345C68, 0xA5A5F451, 0xE5E534D1, 0xF1F108F9, 0x717193E2, 0xD8D873AB, 0x31315362, 0x15153F2A, 
0x04040C08, 0xC7C75295, 0x23236546, 0xC3C35E9D, 0x18182830, 0x9696A137, 0x05050F0A, 0x9A9AB52F, 
0x0707090E, 0x12123624, 0x80809B1B, 0xE2E23DDF, 0xEBEB26CD, 0x2727694E, 0xB2B2CD7F, 0x75759FEA, 
0x09091B12, 0x83839E1D, 0x2C2C7458, 0x1A1A2E34, 0x1B1B2D36, 0x6E6EB2DC, 0x5A5AEEB4, 0xA0A0FB5B, 
0x5252F6A4, 0x3B3B4D76, 0xD6D661B7, 0xB3B3CE7D, 0x29297B52, 0xE3E33EDD, 0x2F2F715E, 0x84849713, 
0x5353F5A6, 0xD1D168B9, 0x00000000, 0xEDED2CC1, 0x20206040, 0xFCFC1FE3, 0xB1B1C879, 0x5B5BEDB6, 
0x6A6ABED4, 0xCBCB468D, 0xBEBED967, 0x39394B72, 0x4A4ADE94, 0x4C4CD498, 0x5858E8B0, 0xCFCF4A85, 
0xD0D06BBB, 0xEFEF2AC5, 0xAAAAE54F, 0xFBFB16ED, 0x4343C586, 0x4D4DD79A, 0x33335566, 0x85859411, 
0x4545CF8A, 0xF9F910E9, 0x02020604, 0x7F7F81FE, 0x5050F0A0, 0x3C3C4478, 0x9F9FBA25, 0xA8A8E34B, 
0x5151F3A2, 0xA3A3FE5D, 0x4040C080, 0x8F8F8A05, 0x9292AD3F, 0x9D9DBC21, 0x38384870, 0xF5F504F1, 
0xBCBCDF63, 0xB6B6C177, 0xDADA75AF, 0x21216342, 0x10103020, 0xFFFF1AE5, 0xF3F30EFD, 0xD2D26DBF, 
0xCDCD4C81, 0x0C0C1418, 0x13133526, 0xECEC2FC3, 0x5F5FE1BE, 0x9797A235, 0x4444CC88, 0x1717392E, 
0xC4C45793, 0xA7A7F255, 0x7E7E82FC, 0x3D3D477A, 0x6464ACC8, 0x5D5DE7BA, 0x19192B32, 0x737395E6, 
0x6060A0C0, 0x81819819, 0x4F4FD19E, 0xDCDC7FA3, 0x22226644, 0x2A2A7E54, 0x9090AB3B, 0x8888830B, 
0x4646CA8C, 0xEEEE29C7, 0xB8B8D36B, 0x14143C28, 0xDEDE79A7, 0x5E5EE2BC, 0x0B0B1D16, 0xDBDB76AD, 
0xE0E03BDB, 0x32325664, 0x3A3A4E74, 0x0A0A1E14, 0x4949DB92, 0x06060A0C, 0x24246C48, 0x5C5CE4B8, 
0xC2C25D9F, 0xD3D36EBD, 0xACACEF43, 0x6262A6C4, 0x9191A839, 0x9595A431, 0xE4E437D3, 0x79798BF2, 
0xE7E732D5, 0xC8C8438B, 0x3737596E, 0x6D6DB7DA, 0x8D8D8C01, 0xD5D564B1, 0x4E4ED29C, 0xA9A9E049, 
0x6C6CB4D8, 0x5656FAAC, 0xF4F407F3, 0xEAEA25CF, 0x6565AFCA, 0x7A7A8EF4, 0xAEAEE947, 0x08081810, 
0xBABAD56F, 0x787888F0, 0x25256F4A, 0x2E2E725C, 0x1C1C2438, 0xA6A6F157, 0xB4B4C773, 0xC6C65197, 
0xE8E823CB, 0xDDDD7CA1, 0x74749CE8, 0x1F1F213E, 0x4B4BDD96, 0xBDBDDC61, 0x8B8B860D, 0x8A8A850F, 
0x707090E0, 0x3E3E427C, 0xB5B5C471, 0x6666AACC, 0x4848D890, 0x03030506, 0xF6F601F7, 0x0E0E121C, 
0x6161A3C2, 0x35355F6A, 0x5757F9AE, 0xB9B9D069, 0x86869117, 0xC1C15899, 0x1D1D273A, 0x9E9EB927, 
0xE1E138D9, 0xF8F813EB, 0x9898B32B, 0x11113322, 0x6969BBD2, 0xD9D970A9, 0x8E8E8907, 0x9494A733, 
0x9B9BB62D, 0x1E1E223C, 0x87879215, 0xE9E920C9, 0xCECE4987, 0x5555FFAA, 0x28287850, 0xDFDF7AA5, 
0x8C8C8F03, 0xA1A1F859, 0x89898009, 0x0D0D171A, 0xBFBFDA65, 0xE6E631D7, 0x4242C684, 0x6868B8D0, 
0x4141C382, 0x9999B029, 0x2D2D775A, 0x0F0F111E, 0xB0B0CB7B, 0x5454FCA8, 0xBBBBD66D, 0x16163A2C
);

$dt3=array(
0xF4A75051, 0x4165537E, 0x17A4C31A, 0x275E963A, 0xAB6BCB3B, 0x9D45F11F, 0xFA58ABAC, 0xE303934B, 
0x30FA5520, 0x766DF6AD, 0xCC769188, 0x024C25F5, 0xE5D7FC4F, 0x2ACBD7C5, 0x35448026, 0x62A38FB5, 
0xB15A49DE, 0xBA1B6725, 0xEA0E9845, 0xFEC0E15D, 0x2F7502C3, 0x4CF01281, 0x4697A38D, 0xD3F9C66B, 
0x8F5FE703, 0x929C9515, 0x6D7AEBBF, 0x5259DA95, 0xBE832DD4, 0x7421D358, 0xE0692949, 0xC9C8448E, 
0xC2896A75, 0x8E7978F4, 0x583E6B99, 0xB971DD27, 0xE14FB6BE, 0x88AD17F0, 0x20AC66C9, 0xCE3AB47D, 
0xDF4A1863, 0x1A3182E5, 0x51336097, 0x537F4562, 0x6477E0B1, 0x6BAE84BB, 0x81A01CFE, 0x082B94F9, 
0x48685870, 0x45FD198F, 0xDE6C8794, 0x7BF8B752, 0x73D323AB, 0x4B02E272, 0x1F8F57E3, 0x55AB2A66, 
0xEB2807B2, 0xB5C2032F, 0xC57B9A86, 0x3708A5D3, 0x2887F230, 0xBFA5B223, 0x036ABA02, 0x16825CED, 
0xCF1C2B8A, 0x79B492A7, 0x07F2F0F3, 0x69E2A14E, 0xDAF4CD65, 0x05BED506, 0x34621FD1, 0xA6FE8AC4, 
0x2E539D34, 0xF355A0A2, 0x8AE13205, 0xF6EB75A4, 0x83EC390B, 0x60EFAA40, 0x719F065E, 0x6E1051BD, 
0x218AF93E, 0xDD063D96, 0x3E05AEDD, 0xE6BD464D, 0x548DB591, 0xC45D0571, 0x06D46F04, 0x5015FF60, 
0x98FB2419, 0xBDE997D6, 0x4043CC89, 0xD99E7767, 0xE842BDB0, 0x898B8807, 0x195B38E7, 0xC8EEDB79, 
0x7C0A47A1, 0x420FE97C, 0x841EC9F8, 0x00000000, 0x80868309, 0x2BED4832, 0x1170AC1E, 0x5A724E6C, 
0x0EFFFBFD, 0x8538560F, 0xAED51E3D, 0x2D392736, 0x0FD9640A, 0x5CA62168, 0x5B54D19B, 0x362E3A24, 
0x0A67B10C, 0x57E70F93, 0xEE96D2B4, 0x9B919E1B, 0xC0C54F80, 0xDC20A261, 0x774B695A, 0x121A161C, 
0x93BA0AE2, 0xA02AE5C0, 0x22E0433C, 0x1B171D12, 0x090D0B0E, 0x8BC7ADF2, 0xB6A8B92D, 0x1EA9C814, 
0xF1198557, 0x75074CAF, 0x99DDBBEE, 0x7F60FDA3, 0x01269FF7, 0x72F5BC5C, 0x663BC544, 0xFB7E345B, 
0x4329768B, 0x23C6DCCB, 0xEDFC68B6, 0xE4F163B8, 0x31DCCAD7, 0x63851042, 0x97224013, 0xC6112084, 
0x4A247D85, 0xBB3DF8D2, 0xF93211AE, 0x29A16DC7, 0x9E2F4B1D, 0xB230F3DC, 0x8652EC0D, 0xC1E3D077, 
0xB3166C2B, 0x70B999A9, 0x9448FA11, 0xE9642247, 0xFC8CC4A8, 0xF03F1AA0, 0x7D2CD856, 0x3390EF22, 
0x494EC787, 0x38D1C1D9, 0xCAA2FE8C, 0xD40B3698, 0xF581CFA6, 0x7ADE28A5, 0xB78E26DA, 0xADBFA43F, 
0x3A9DE42C, 0x78920D50, 0x5FCC9B6A, 0x7E466254, 0x8D13C2F6, 0xD8B8E890, 0x39F75E2E, 0xC3AFF582, 
0x5D80BE9F, 0xD0937C69, 0xD52DA96F, 0x2512B3CF, 0xAC993BC8, 0x187DA710, 0x9C636EE8, 0x3BBB7BDB, 
0x267809CD, 0x5918F46E, 0x9AB701EC, 0x4F9AA883, 0x956E65E6, 0xFFE67EAA, 0xBCCF0821, 0x15E8E6EF, 
0xE79BD9BA, 0x6F36CE4A, 0x9F09D4EA, 0xB07CD629, 0xA4B2AF31, 0x3F23312A, 0xA59430C6, 0xA266C035, 
0x4EBC3774, 0x82CAA6FC, 0x90D0B0E0, 0xA7D81533, 0x04984AF1, 0xECDAF741, 0xCD500E7F, 0x91F62F17, 
0x4DD68D76, 0xEFB04D43, 0xAA4D54CC, 0x9604DFE4, 0xD1B5E39E, 0x6A881B4C, 0x2C1FB8C1, 0x65517F46, 
0x5EEA049D, 0x8C355D01, 0x877473FA, 0x0B412EFB, 0x671D5AB3, 0xDBD25292, 0x105633E9, 0xD647136D, 
0xD7618C9A, 0xA10C7A37, 0xF8148E59, 0x133C89EB, 0xA927EECE, 0x61C935B7, 0x1CE5EDE1, 0x47B13C7A, 
0xD2DF599C, 0xF2733F55, 0x14CE7918, 0xC737BF73, 0xF7CDEA53, 0xFDAA5B5F, 0x3D6F14DF, 0x44DB8678, 
0xAFF381CA, 0x68C43EB9, 0x24342C38, 0xA3405FC2, 0x1DC37216, 0xE2250CBC, 0x3C498B28, 0x0D9541FF, 
0xA8017139, 0x0CB3DE08, 0xB4E49CD8, 0x56C19064, 0xCB84617B, 0x32B670D5, 0x6C5C7448, 0xB85742D0
);

for ($i=0; $i < 256; $i++) {
$t2[$i <<  8]=(($t3[$i] <<  8) & 0xFFFFFF00) | (($t3[$i] >> 24) & 0x000000FF);
$t1[$i << 16]=(($t3[$i] << 16) & 0xFFFF0000) | (($t3[$i] >> 16) & 0x0000FFFF);
$t0[$i << 24]=(($t3[$i] << 24) & 0xFF000000) | (($t3[$i] >>  8) & 0x00FFFFFF);

$dt2[$i <<  8]=(($this->dt3[$i] <<  8) & 0xFFFFFF00) | (($dt3[$i] >> 24) & 0x000000FF);
$dt1[$i << 16]=(($this->dt3[$i] << 16) & 0xFFFF0000) | (($dt3[$i] >> 16) & 0x0000FFFF);
$dt0[$i << 24]=(($this->dt3[$i] << 24) & 0xFF000000) | (($dt3[$i] >>  8) & 0x00FFFFFF);
}
}
function setKey($key)
{
$this->key=$key;
$this->changed=true;
}
function setIV($iv)
{
$this->encryptIV=$this->decryptIV=$this->iv=str_pad(substr($iv, 0, $this->block_size), $this->block_size, chr(0));
}
function setKeyLength($length)
{
$length >>= 5;
if ($length > 8) {
$length=8;
} else if ($length < 4) {
$length=4;
}
$this->Nk=$length;
$this->key_size=$length << 2;

$this->explicit_key_length=true;
$this->changed=true;
}
function setPassword($password, $method='pbkdf2')
{
$key='';

switch ($method) {
default:
list(, , $hash, $salt, $count)=func_get_args();
if (!isset($hash)) {
$hash='sha1';
}
if (!isset($salt)) {
$salt='phpseclib/salt';
}
if (!isset($count)) {
$count=1000;
}

if (!class_exists('Crypt_Hash')) {
require_once('Crypt/Hash.php');
}

$i=1;
while (strlen($key) < $this->key_size) {
$hmac=new Crypt_Hash();
$hmac->setHash($hash);
$hmac->setKey($password);
$f=$u=$hmac->hash($salt . pack('N', $i++));
for ($j=2; $j <= $count; $j++) {
$u=$hmac->hash($u);
$f^= $u;
}
$key.= $f;
}
}

$this->setKey(substr($key, 0, $this->key_size));
}
function setBlockLength($length)
{
$length >>= 5;
if ($length > 8) {
$length=8;
} else if ($length < 4) {
$length=4;
}
$this->Nb=$length;
$this->block_size=$length << 2;
$this->changed=true;
}
function _generate_xor($length, &$iv)
{
$xor='';
$block_size=$this->block_size;
$num_blocks=floor(($length + ($block_size - 1)) / $block_size);
for ($i=0; $i < $num_blocks; $i++) {
$xor.= $iv;
for ($j=4; $j <= $block_size; $j+=4) {
$temp=substr($iv, -$j, 4);
switch ($temp) {
case "\xFF\xFF\xFF\xFF":
$iv=substr_replace($iv, "\x00\x00\x00\x00", -$j, 4);
break;
case "\x7F\xFF\xFF\xFF":
$iv=substr_replace($iv, "\x80\x00\x00\x00", -$j, 4);
break 2;
default:
extract(unpack('Ncount', $temp));
$iv=substr_replace($iv, pack('N', $count + 1), -$j, 4);
break 2;
}
}
}

return $xor;
}
function encrypt($plaintext)
{
$this->_setup();
if ($this->paddable) {
$plaintext=$this->_pad($plaintext);
}

$block_size=$this->block_size;
$buffer=&$this->enbuffer;
$continuousBuffer=$this->continuousBuffer;
$ciphertext='';
switch ($this->mode) {
case CRYPT_RIJNDAEL_MODE_ECB:
for ($i=0; $i < strlen($plaintext); $i+=$block_size) {
$ciphertext.= $this->_encryptBlock(substr($plaintext, $i, $block_size));
}
break;
case CRYPT_RIJNDAEL_MODE_CBC:
$xor=$this->encryptIV;
for ($i=0; $i < strlen($plaintext); $i+=$block_size) {
$block=substr($plaintext, $i, $block_size);
$block=$this->_encryptBlock($block ^ $xor);
$xor=$block;
$ciphertext.= $block;
}
if ($this->continuousBuffer) {
$this->encryptIV=$xor;
}
break;
case CRYPT_RIJNDAEL_MODE_CTR:
$xor=$this->encryptIV;
if (!empty($buffer['encrypted'])) {
for ($i=0; $i < strlen($plaintext); $i+=$block_size) {
$block=substr($plaintext, $i, $block_size);
$buffer['encrypted'].= $this->_encryptBlock($this->_generate_xor($block_size, $xor));
$key=$this->_string_shift($buffer['encrypted'], $block_size);
$ciphertext.= $block ^ $key;
}
} else {
for ($i=0; $i < strlen($plaintext); $i+=$block_size) {
$block=substr($plaintext, $i, $block_size);
$key=$this->_encryptBlock($this->_generate_xor($block_size, $xor));
$ciphertext.= $block ^ $key;
}
}
if ($this->continuousBuffer) {
$this->encryptIV=$xor;
if ($start=strlen($plaintext) % $block_size) {
$buffer['encrypted']=substr($key, $start) . $buffer['encrypted'];
}
}
break;
case CRYPT_RIJNDAEL_MODE_CFB:
if (!empty($buffer['xor'])) {
$ciphertext=$plaintext ^ $buffer['xor'];
$iv=$buffer['encrypted'] . $ciphertext;
$start=strlen($ciphertext);
$buffer['encrypted'].= $ciphertext;
$buffer['xor']=substr($buffer['xor'], strlen($ciphertext));
} else {
$ciphertext='';
$iv=$this->encryptIV;
$start=0;
}

for ($i=$start; $i < strlen($plaintext); $i+=$block_size) {
$block=substr($plaintext, $i, $block_size);
$xor=$this->_encryptBlock($iv);
$iv=$block ^ $xor;
if ($continuousBuffer && strlen($iv) != $block_size) {
$buffer=array(
'encrypted' => $iv,
'xor' => substr($xor, strlen($iv))
);
}
$ciphertext.= $iv;
}

if ($this->continuousBuffer) {
$this->encryptIV=$iv;
}
break;
case CRYPT_RIJNDAEL_MODE_OFB:
$xor=$this->encryptIV;
if (strlen($buffer)) {
for ($i=0; $i < strlen($plaintext); $i+=$block_size) {
$xor=$this->_encryptBlock($xor);
$buffer.= $xor;
$key=$this->_string_shift($buffer, $block_size);
$ciphertext.= substr($plaintext, $i, $block_size) ^ $key;
}
} else {
for ($i=0; $i < strlen($plaintext); $i+=$block_size) {
$xor=$this->_encryptBlock($xor);
$ciphertext.= substr($plaintext, $i, $block_size) ^ $xor;
}
$key=$xor;
}
if ($this->continuousBuffer) {
$this->encryptIV=$xor;
if ($start=strlen($plaintext) % $block_size) {
 $buffer=substr($key, $start) . $buffer;
}
}
}

return $ciphertext;
}
function decrypt($ciphertext)
{
$this->_setup();

if ($this->paddable) {
// we pad with chr(0) since that's what mcrypt_generic does.  to quote from http://php.net/function.mcrypt-generic :
// "The data is padded with "\0" to make sure the length of the data is n * blocksize."
$ciphertext=str_pad($ciphertext, strlen($ciphertext) + ($this->block_size - strlen($ciphertext) % $this->block_size) % $this->block_size, chr(0));
}

$block_size=$this->block_size;
$buffer=&$this->debuffer;
$continuousBuffer=$this->continuousBuffer;
$plaintext='';
switch ($this->mode) {
case CRYPT_RIJNDAEL_MODE_ECB:
for ($i=0; $i < strlen($ciphertext); $i+=$block_size) {
$plaintext.= $this->_decryptBlock(substr($ciphertext, $i, $block_size));
}
break;
case CRYPT_RIJNDAEL_MODE_CBC:
$xor=$this->decryptIV;
for ($i=0; $i < strlen($ciphertext); $i+=$block_size) {
$block=substr($ciphertext, $i, $block_size);
$plaintext.= $this->_decryptBlock($block) ^ $xor;
$xor=$block;
}
if ($this->continuousBuffer) {
$this->decryptIV=$xor;
}
break;
case CRYPT_RIJNDAEL_MODE_CTR:
$xor=$this->decryptIV;
if (!empty($buffer['ciphertext'])) {
for ($i=0; $i < strlen($ciphertext); $i+=$block_size) {
$block=substr($ciphertext, $i, $block_size);
$buffer['ciphertext'].= $this->_encryptBlock($this->_generate_xor($block_size, $xor));
$key=$this->_string_shift($buffer['ciphertext'], $block_size);
$plaintext.= $block ^ $key;
}
} else {
for ($i=0; $i < strlen($ciphertext); $i+=$block_size) {
$block=substr($ciphertext, $i, $block_size);
$key=$this->_encryptBlock($this->_generate_xor($block_size, $xor));
$plaintext.= $block ^ $key;
}
}
if ($this->continuousBuffer) {
$this->decryptIV=$xor;
if ($start=strlen($ciphertext) % $block_size) {
$buffer['ciphertext']=substr($key, $start) . $buffer['encrypted'];
}
}
break;
case CRYPT_RIJNDAEL_MODE_CFB:
if (!empty($buffer['ciphertext'])) {
$plaintext=$ciphertext ^ substr($this->decryptIV, strlen($buffer['ciphertext']));
$buffer['ciphertext'].= substr($ciphertext, 0, strlen($plaintext));
if (strlen($buffer['ciphertext']) == $block_size) {
$xor=$this->_encryptBlock($buffer['ciphertext']);
$buffer['ciphertext']='';
}
$start=strlen($plaintext);
$block=$this->decryptIV;
} else {
$plaintext='';
$xor=$this->_encryptBlock($this->decryptIV);
$start=0;
}

for ($i=$start; $i < strlen($ciphertext); $i+=$block_size) {
$block=substr($ciphertext, $i, $block_size);
$plaintext.= $block ^ $xor;
if ($continuousBuffer && strlen($block) != $block_size) {
$buffer['ciphertext'].= $block;
$block=$xor;
} else if (strlen($block) == $block_size) {
$xor=$this->_encryptBlock($block);
}
}
if ($this->continuousBuffer) {
$this->decryptIV=$block;
}
break;
case CRYPT_RIJNDAEL_MODE_OFB:
$xor=$this->decryptIV;
if (strlen($buffer)) {
for ($i=0; $i < strlen($ciphertext); $i+=$block_size) {
$xor=$this->_encryptBlock($xor);
$buffer.= $xor;
$key=$this->_string_shift($buffer, $block_size);
$plaintext.= substr($ciphertext, $i, $block_size) ^ $key;
}
} else {
for ($i=0; $i < strlen($ciphertext); $i+=$block_size) {
$xor=$this->_encryptBlock($xor);
$plaintext.= substr($ciphertext, $i, $block_size) ^ $xor;
}
$key=$xor;
}
if ($this->continuousBuffer) {
$this->decryptIV=$xor;
if ($start=strlen($ciphertext) % $block_size) {
 $buffer=substr($key, $start) . $buffer;
}
}
}

return $this->paddable ? $this->_unpad($plaintext) : $plaintext;
}
function _encryptBlock($in)
{
$state=array();
$words=unpack('N*word', $in);

$w=$this->w;
$t0=$this->t0;
$t1=$this->t1;
$t2=$this->t2;
$t3=$this->t3;
$Nb=$this->Nb;
$Nr=$this->Nr;
$c=$this->c;

$i=0;
foreach ($words as $word) {
$state[]=$word ^ $w[0][$i++];
}
$temp=array();
for ($round=1; $round < $Nr; $round++) {
$i=0; // $c[0] == 0
$j=$c[1];
$k=$c[2];
$l=$c[3];

while ($i < $this->Nb) {
$temp[$i]=$t0[$state[$i] & 0xFF000000] ^ 
$t1[$state[$j] & 0x00FF0000] ^ 
$t2[$state[$k] & 0x0000FF00] ^ 
$t3[$state[$l] & 0x000000FF] ^ 
$w[$round][$i];
$i++;
$j=($j + 1) % $Nb;
$k=($k + 1) % $Nb;
$l=($l + 1) % $Nb;
}

for ($i=0; $i < $Nb; $i++) {
$state[$i]=$temp[$i];
}
}

for ($i=0; $i < $Nb; $i++) {
$state[$i]=$this->_subWord($state[$i]);
}

$i=0;
$j=$c[1];
$k=$c[2];
$l=$c[3];
while ($i < $this->Nb) {
$temp[$i]=($state[$i] & 0xFF000000) ^ 
($state[$j] & 0x00FF0000) ^ 
($state[$k] & 0x0000FF00) ^ 
($state[$l] & 0x000000FF) ^
 $w[$Nr][$i];
$i++;
$j=($j + 1) % $Nb;
$k=($k + 1) % $Nb;
$l=($l + 1) % $Nb;
}
$state=$temp;

array_unshift($state, 'N*');

return call_user_func_array('pack', $state);
}
function _decryptBlock($in)
{
$state=array();
$words=unpack('N*word', $in);

$num_states=count($state);
$dw=$this->dw;
$dt0=$this->dt0;
$dt1=$this->dt1;
$dt2=$this->dt2;
$dt3=$this->dt3;
$Nb=$this->Nb;
$Nr=$this->Nr;
$c=$this->c;
$i=0;
foreach ($words as $word) {
$state[]=$word ^ $dw[$Nr][$i++];
}

$temp=array();
for ($round=$Nr - 1; $round > 0; $round--) {
$i=0;
$j=$Nb - $c[1];
$k=$Nb - $c[2];
$l=$Nb - $c[3];

while ($i < $Nb) {
$temp[$i]=$dt0[$state[$i] & 0xFF000000] ^ 
$dt1[$state[$j] & 0x00FF0000] ^ 
$dt2[$state[$k] & 0x0000FF00] ^ 
$dt3[$state[$l] & 0x000000FF] ^ 
$dw[$round][$i];
$i++;
$j=($j + 1) % $Nb;
$k=($k + 1) % $Nb;
$l=($l + 1) % $Nb;
}

for ($i=0; $i < $Nb; $i++) {
$state[$i]=$temp[$i];
}
}
$i=0;
$j=$Nb - $c[1];
$k=$Nb - $c[2];
$l=$Nb - $c[3];

while ($i < $Nb) {
$temp[$i]=$dw[0][$i] ^ 
$this->_invSubWord(($state[$i] & 0xFF000000) | 
   ($state[$j] & 0x00FF0000) | 
   ($state[$k] & 0x0000FF00) | 
   ($state[$l] & 0x000000FF));
$i++;
$j=($j + 1) % $Nb;
$k=($k + 1) % $Nb;
$l=($l + 1) % $Nb;
}

$state=$temp;

array_unshift($state, 'N*');

return call_user_func_array('pack', $state);
}

function _setup()
{
static $rcon=array(0,
0x01000000, 0x02000000, 0x04000000, 0x08000000, 0x10000000,
0x20000000, 0x40000000, 0x80000000, 0x1B000000, 0x36000000,
0x6C000000, 0xD8000000, 0xAB000000, 0x4D000000, 0x9A000000,
0x2F000000, 0x5E000000, 0xBC000000, 0x63000000, 0xC6000000,
0x97000000, 0x35000000, 0x6A000000, 0xD4000000, 0xB3000000,
0x7D000000, 0xFA000000, 0xEF000000, 0xC5000000, 0x91000000
);

if (!$this->changed) {
return;
}

if (!$this->explicit_key_length) {
$length=strlen($this->key) >> 2;
if ($length > 8) {
$length=8;
} else if ($length < 4) {
$length=4;
}
$this->Nk=$length;
$this->key_size=$length << 2;
}

$this->key=str_pad(substr($this->key, 0, $this->key_size), $this->key_size, chr(0));
$this->encryptIV=$this->decryptIV=$this->iv=str_pad(substr($this->iv, 0, $this->block_size), $this->block_size, chr(0));

$this->Nr=max($this->Nk, $this->Nb) + 6;

switch ($this->Nb) {
case 4:
case 5:
case 6:
$this->c=array(0, 1, 2, 3);
break;
case 7:
$this->c=array(0, 1, 2, 4);
break;
case 8:
$this->c=array(0, 1, 3, 4);
}

$key=$this->key;

$w=array_values(unpack('N*words', $key));

$length=$this->Nb * ($this->Nr + 1);
for ($i=$this->Nk; $i < $length; $i++) {
$temp=$w[$i - 1];
if ($i % $this->Nk == 0) {
$temp=(($temp << 8) & 0xFFFFFF00) | (($temp >> 24) & 0x000000FF);
$temp=$this->_subWord($temp) ^ $rcon[$i / $this->Nk];
} else if ($this->Nk > 6 && $i % $this->Nk == 4) {
$temp=$this->_subWord($temp);
}
$w[$i]=$w[$i - $this->Nk] ^ $temp;
}
$temp=array();
for ($i=$row=$col=0; $i < $length; $i++, $col++) {
if ($col == $this->Nb) {
if ($row == 0) {
$this->dw[0]=$this->w[0];
} else {
$j=0;
while ($j < $this->Nb) {
$dw=$this->_subWord($this->w[$row][$j]);
$temp[$j]=$this->dt0[$dw & 0xFF000000] ^ 
$this->dt1[$dw & 0x00FF0000] ^ 
$this->dt2[$dw & 0x0000FF00] ^ 
$this->dt3[$dw & 0x000000FF];
$j++;
}
$this->dw[$row]=$temp;
}

$col=0;
$row++;
}
$this->w[$row][$col]=$w[$i];
}

$this->dw[$row]=$this->w[$row];

$this->changed=false;
}
function _subWord($word)
{
static $sbox0, $sbox1, $sbox2, $sbox3;

if (empty($sbox0)) {
$sbox0=array(
0x63, 0x7C, 0x77, 0x7B, 0xF2, 0x6B, 0x6F, 0xC5, 0x30, 0x01, 0x67, 0x2B, 0xFE, 0xD7, 0xAB, 0x76,
0xCA, 0x82, 0xC9, 0x7D, 0xFA, 0x59, 0x47, 0xF0, 0xAD, 0xD4, 0xA2, 0xAF, 0x9C, 0xA4, 0x72, 0xC0,
0xB7, 0xFD, 0x93, 0x26, 0x36, 0x3F, 0xF7, 0xCC, 0x34, 0xA5, 0xE5, 0xF1, 0x71, 0xD8, 0x31, 0x15,
0x04, 0xC7, 0x23, 0xC3, 0x18, 0x96, 0x05, 0x9A, 0x07, 0x12, 0x80, 0xE2, 0xEB, 0x27, 0xB2, 0x75,
0x09, 0x83, 0x2C, 0x1A, 0x1B, 0x6E, 0x5A, 0xA0, 0x52, 0x3B, 0xD6, 0xB3, 0x29, 0xE3, 0x2F, 0x84,
0x53, 0xD1, 0x00, 0xED, 0x20, 0xFC, 0xB1, 0x5B, 0x6A, 0xCB, 0xBE, 0x39, 0x4A, 0x4C, 0x58, 0xCF,
0xD0, 0xEF, 0xAA, 0xFB, 0x43, 0x4D, 0x33, 0x85, 0x45, 0xF9, 0x02, 0x7F, 0x50, 0x3C, 0x9F, 0xA8,
0x51, 0xA3, 0x40, 0x8F, 0x92, 0x9D, 0x38, 0xF5, 0xBC, 0xB6, 0xDA, 0x21, 0x10, 0xFF, 0xF3, 0xD2,
0xCD, 0x0C, 0x13, 0xEC, 0x5F, 0x97, 0x44, 0x17, 0xC4, 0xA7, 0x7E, 0x3D, 0x64, 0x5D, 0x19, 0x73,
0x60, 0x81, 0x4F, 0xDC, 0x22, 0x2A, 0x90, 0x88, 0x46, 0xEE, 0xB8, 0x14, 0xDE, 0x5E, 0x0B, 0xDB,
0xE0, 0x32, 0x3A, 0x0A, 0x49, 0x06, 0x24, 0x5C, 0xC2, 0xD3, 0xAC, 0x62, 0x91, 0x95, 0xE4, 0x79,
0xE7, 0xC8, 0x37, 0x6D, 0x8D, 0xD5, 0x4E, 0xA9, 0x6C, 0x56, 0xF4, 0xEA, 0x65, 0x7A, 0xAE, 0x08,
0xBA, 0x78, 0x25, 0x2E, 0x1C, 0xA6, 0xB4, 0xC6, 0xE8, 0xDD, 0x74, 0x1F, 0x4B, 0xBD, 0x8B, 0x8A,
0x70, 0x3E, 0xB5, 0x66, 0x48, 0x03, 0xF6, 0x0E, 0x61, 0x35, 0x57, 0xB9, 0x86, 0xC1, 0x1D, 0x9E,
0xE1, 0xF8, 0x98, 0x11, 0x69, 0xD9, 0x8E, 0x94, 0x9B, 0x1E, 0x87, 0xE9, 0xCE, 0x55, 0x28, 0xDF,
0x8C, 0xA1, 0x89, 0x0D, 0xBF, 0xE6, 0x42, 0x68, 0x41, 0x99, 0x2D, 0x0F, 0xB0, 0x54, 0xBB, 0x16
);

$sbox1=array();
$sbox2=array();
$sbox3=array();

for ($i=0; $i < 256; $i++) {
$sbox1[$i <<  8]=$sbox0[$i] <<  8;
$sbox2[$i << 16]=$sbox0[$i] << 16;
$sbox3[$i << 24]=$sbox0[$i] << 24;
}
}

return $sbox0[$word & 0x000000FF] | 
   $sbox1[$word & 0x0000FF00] | 
   $sbox2[$word & 0x00FF0000] | 
   $sbox3[$word & 0xFF000000];
}
function _invSubWord($word)
{
static $sbox0, $sbox1, $sbox2, $sbox3;

if (empty($sbox0)) {
$sbox0=array(
0x52, 0x09, 0x6A, 0xD5, 0x30, 0x36, 0xA5, 0x38, 0xBF, 0x40, 0xA3, 0x9E, 0x81, 0xF3, 0xD7, 0xFB,
0x7C, 0xE3, 0x39, 0x82, 0x9B, 0x2F, 0xFF, 0x87, 0x34, 0x8E, 0x43, 0x44, 0xC4, 0xDE, 0xE9, 0xCB,
0x54, 0x7B, 0x94, 0x32, 0xA6, 0xC2, 0x23, 0x3D, 0xEE, 0x4C, 0x95, 0x0B, 0x42, 0xFA, 0xC3, 0x4E,
0x08, 0x2E, 0xA1, 0x66, 0x28, 0xD9, 0x24, 0xB2, 0x76, 0x5B, 0xA2, 0x49, 0x6D, 0x8B, 0xD1, 0x25,
0x72, 0xF8, 0xF6, 0x64, 0x86, 0x68, 0x98, 0x16, 0xD4, 0xA4, 0x5C, 0xCC, 0x5D, 0x65, 0xB6, 0x92,
0x6C, 0x70, 0x48, 0x50, 0xFD, 0xED, 0xB9, 0xDA, 0x5E, 0x15, 0x46, 0x57, 0xA7, 0x8D, 0x9D, 0x84,
0x90, 0xD8, 0xAB, 0x00, 0x8C, 0xBC, 0xD3, 0x0A, 0xF7, 0xE4, 0x58, 0x05, 0xB8, 0xB3, 0x45, 0x06,
0xD0, 0x2C, 0x1E, 0x8F, 0xCA, 0x3F, 0x0F, 0x02, 0xC1, 0xAF, 0xBD, 0x03, 0x01, 0x13, 0x8A, 0x6B,
0x3A, 0x91, 0x11, 0x41, 0x4F, 0x67, 0xDC, 0xEA, 0x97, 0xF2, 0xCF, 0xCE, 0xF0, 0xB4, 0xE6, 0x73,
0x96, 0xAC, 0x74, 0x22, 0xE7, 0xAD, 0x35, 0x85, 0xE2, 0xF9, 0x37, 0xE8, 0x1C, 0x75, 0xDF, 0x6E,
0x47, 0xF1, 0x1A, 0x71, 0x1D, 0x29, 0xC5, 0x89, 0x6F, 0xB7, 0x62, 0x0E, 0xAA, 0x18, 0xBE, 0x1B,
0xFC, 0x56, 0x3E, 0x4B, 0xC6, 0xD2, 0x79, 0x20, 0x9A, 0xDB, 0xC0, 0xFE, 0x78, 0xCD, 0x5A, 0xF4,
0x1F, 0xDD, 0xA8, 0x33, 0x88, 0x07, 0xC7, 0x31, 0xB1, 0x12, 0x10, 0x59, 0x27, 0x80, 0xEC, 0x5F,
0x60, 0x51, 0x7F, 0xA9, 0x19, 0xB5, 0x4A, 0x0D, 0x2D, 0xE5, 0x7A, 0x9F, 0x93, 0xC9, 0x9C, 0xEF,
0xA0, 0xE0, 0x3B, 0x4D, 0xAE, 0x2A, 0xF5, 0xB0, 0xC8, 0xEB, 0xBB, 0x3C, 0x83, 0x53, 0x99, 0x61,
0x17, 0x2B, 0x04, 0x7E, 0xBA, 0x77, 0xD6, 0x26, 0xE1, 0x69, 0x14, 0x63, 0x55, 0x21, 0x0C, 0x7D
);

$sbox1=array();
$sbox2=array();
$sbox3=array();

for ($i=0; $i < 256; $i++) {
$sbox1[$i <<  8]=$sbox0[$i] <<  8;
$sbox2[$i << 16]=$sbox0[$i] << 16;
$sbox3[$i << 24]=$sbox0[$i] << 24;
}
}

return $sbox0[$word & 0x000000FF] | 
   $sbox1[$word & 0x0000FF00] | 
   $sbox2[$word & 0x00FF0000] | 
   $sbox3[$word & 0xFF000000];
}
function enablePadding()
{
$this->padding=true;
}
function disablePadding()
{
$this->padding=false;
}
function _pad($text)
{
$length=strlen($text);

if (!$this->padding) {
if ($length % $this->block_size == 0) {
return $text;
} else {
user_error("The plaintext's length ($length) is not a multiple of the block size ({$this->block_size})", E_USER_NOTICE);
$this->padding=true;
}
}

$pad=$this->block_size - ($length % $this->block_size);

return str_pad($text, $length + $pad, chr($pad));
}
function _unpad($text)
{
if (!$this->padding) {
return $text;
}

$length=ord($text[strlen($text) - 1]);

if (!$length || $length > $this->block_size) {
return false;
}

return substr($text, 0, -$length);
}
function enableContinuousBuffer()
{
$this->continuousBuffer=true;
}
function disableContinuousBuffer()
{
$this->continuousBuffer=false;
$this->encryptIV=$this->iv;
$this->decryptIV=$this->iv;
}
function _string_shift(&$string, $index=1)
{
$substr=substr($string, 0, $index);
$string=substr($string, $index);
return $substr;
}
}

define('CRYPT_AES_MODE_CTR', -1);
define('CRYPT_AES_MODE_ECB', 1);
define('CRYPT_AES_MODE_CBC', 2);
define('CRYPT_AES_MODE_CFB', 3);
define('CRYPT_AES_MODE_OFB', 4);
define('CRYPT_AES_MODE_INTERNAL', 1);
define('CRYPT_AES_MODE_MCRYPT', 2);
class Crypt_AES extends Crypt_Rijndael {
var $enmcrypt;
var $demcrypt;
var $ecb;
function Crypt_AES($mode=CRYPT_AES_MODE_CBC)
{
if ( !defined('CRYPT_AES_MODE') ) {
switch (true) {
case extension_loaded('mcrypt') && in_array('rijndael-128', mcrypt_list_algorithms()):
define('CRYPT_AES_MODE', CRYPT_AES_MODE_MCRYPT);
break;
default:
define('CRYPT_AES_MODE', CRYPT_AES_MODE_INTERNAL);
}
}

switch ( CRYPT_AES_MODE ) {
case CRYPT_AES_MODE_MCRYPT:
switch ($mode) {
case CRYPT_AES_MODE_ECB:
$this->paddable=true;
$this->mode=MCRYPT_MODE_ECB;
break;
case CRYPT_AES_MODE_CTR:
$this->mode='ctr';
break;
case CRYPT_AES_MODE_CFB:
$this->mode='ncfb';
break;
case CRYPT_AES_MODE_OFB:
$this->mode=MCRYPT_MODE_NOFB;
break;
case CRYPT_AES_MODE_CBC:
default:
$this->paddable=true;
$this->mode=MCRYPT_MODE_CBC;
}

$this->debuffer=$this->enbuffer='';

break;
default:
switch ($mode) {
case CRYPT_AES_MODE_ECB:
$this->paddable=true;
$this->mode=CRYPT_RIJNDAEL_MODE_ECB;
break;
case CRYPT_AES_MODE_CTR:
$this->mode=CRYPT_RIJNDAEL_MODE_CTR;
break;
case CRYPT_AES_MODE_CFB:
$this->mode=CRYPT_RIJNDAEL_MODE_CFB;
break;
case CRYPT_AES_MODE_OFB:
$this->mode=CRYPT_RIJNDAEL_MODE_OFB;
break;
case CRYPT_AES_MODE_CBC:
default:
$this->paddable=true;
$this->mode=CRYPT_RIJNDAEL_MODE_CBC;
}
}

if (CRYPT_AES_MODE == CRYPT_AES_MODE_INTERNAL) {
parent::Crypt_Rijndael($this->mode);
}
}
function setBlockLength($length)
{
return;
}
function setIV($iv)
{
parent::setIV($iv);
if ( CRYPT_AES_MODE == CRYPT_AES_MODE_MCRYPT ) {
$this->changed=true;
}
}
function encrypt($plaintext)
{
if ( CRYPT_AES_MODE == CRYPT_AES_MODE_MCRYPT ) {
$changed=$this->changed;
$this->_mcryptSetup();
if ($this->mode == 'ncfb') {
if ($changed) {
$this->ecb=mcrypt_module_open(MCRYPT_RIJNDAEL_128, '', MCRYPT_MODE_ECB, '');
mcrypt_generic_init($this->ecb, $this->key, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0");
}

if (strlen($this->enbuffer)) {
$ciphertext=$plaintext ^ substr($this->encryptIV, strlen($this->enbuffer));
$this->enbuffer.= $ciphertext;
if (strlen($this->enbuffer) == 16) {
$this->encryptIV=$this->enbuffer;
$this->enbuffer='';
mcrypt_generic_init($this->enmcrypt, $this->key, $this->encryptIV);
}
$plaintext=substr($plaintext, strlen($ciphertext));
} else {
$ciphertext='';
}

$last_pos=strlen($plaintext) & 0xFFFFFFF0;
$ciphertext.= $last_pos ? mcrypt_generic($this->enmcrypt, substr($plaintext, 0, $last_pos)) : '';

if (strlen($plaintext) & 0xF) {
if (strlen($ciphertext)) {
$this->encryptIV=substr($ciphertext, -16);
}
$this->encryptIV=mcrypt_generic($this->ecb, $this->encryptIV);
$this->enbuffer=substr($plaintext, $last_pos) ^ $this->encryptIV;
$ciphertext.= $this->enbuffer;
}

return $ciphertext;
}

if ($this->paddable) {
$plaintext=$this->_pad($plaintext);
}

$ciphertext=mcrypt_generic($this->enmcrypt, $plaintext);

if (!$this->continuousBuffer) {
mcrypt_generic_init($this->enmcrypt, $this->key, $this->iv);
}

return $ciphertext;
}

return parent::encrypt($plaintext);
}
function decrypt($ciphertext)
{
if ( CRYPT_AES_MODE == CRYPT_AES_MODE_MCRYPT ) {
$changed=$this->changed;
$this->_mcryptSetup();
if ($this->mode == 'ncfb') {
if ($changed) {
$this->ecb=mcrypt_module_open(MCRYPT_RIJNDAEL_128, '', MCRYPT_MODE_ECB, '');
mcrypt_generic_init($this->ecb, $this->key, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0");
}

if (strlen($this->debuffer)) {
$plaintext=$ciphertext ^ substr($this->decryptIV, strlen($this->debuffer));

$this->debuffer.= substr($ciphertext, 0, strlen($plaintext));
if (strlen($this->debuffer) == 16) {
$this->decryptIV=$this->debuffer;
$this->debuffer='';
mcrypt_generic_init($this->demcrypt, $this->key, $this->decryptIV);
}
$ciphertext=substr($ciphertext, strlen($plaintext));
} else {
$plaintext='';
}

$last_pos=strlen($ciphertext) & 0xFFFFFFF0;
$plaintext.= $last_pos ? mdecrypt_generic($this->demcrypt, substr($ciphertext, 0, $last_pos)) : '';

if (strlen($ciphertext) & 0xF) {
if (strlen($plaintext)) {
$this->decryptIV=substr($ciphertext, $last_pos - 16, 16);
}
$this->decryptIV=mcrypt_generic($this->ecb, $this->decryptIV);
$this->debuffer=substr($ciphertext, $last_pos);
$plaintext.= $this->debuffer ^ $this->decryptIV;
}

return $plaintext;
}

if ($this->paddable) {
$ciphertext=str_pad($ciphertext, (strlen($ciphertext) + 15) & 0xFFFFFFF0, chr(0));
}

$plaintext=mdecrypt_generic($this->demcrypt, $ciphertext);

if (!$this->continuousBuffer) {
mcrypt_generic_init($this->demcrypt, $this->key, $this->iv);
}

return $this->paddable ? $this->_unpad($plaintext) : $plaintext;
}

return parent::decrypt($ciphertext);
}
function _mcryptSetup()
{
if (!$this->changed) {
return;
}

if (!$this->explicit_key_length) {
$length=strlen($this->key) >> 2;
if ($length > 8) {
$length=8;
} else if ($length < 4) {
$length=4;
}
$this->Nk=$length;
$this->key_size=$length << 2;
}

switch ($this->Nk) {
case 4:
$this->key_size=16;
break;
case 5:
case 6:
$this->key_size=24;
break;
case 7:
case 8:
$this->key_size=32;
}

$this->key=str_pad(substr($this->key, 0, $this->key_size), $this->key_size, chr(0));
$this->encryptIV=$this->decryptIV=$this->iv=str_pad(substr($this->iv, 0, 16), 16, chr(0));

if (!isset($this->enmcrypt)) {
$mode=$this->mode;

$this->demcrypt=mcrypt_module_open(MCRYPT_RIJNDAEL_128, '', $mode, '');
$this->enmcrypt=mcrypt_module_open(MCRYPT_RIJNDAEL_128, '', $mode, '');
}

mcrypt_generic_init($this->demcrypt, $this->key, $this->iv);
mcrypt_generic_init($this->enmcrypt, $this->key, $this->iv);

$this->changed=false;
}
function _encryptBlock($in)
{
$state=unpack('N*word', $in);

$Nr=$this->Nr;
$w=$this->w;
$t0=$this->t0;
$t1=$this->t1;
$t2=$this->t2;
$t3=$this->t3;

$state=array(
$state['word1'] ^ $w[0][0],
$state['word2'] ^ $w[0][1],
$state['word3'] ^ $w[0][2],
$state['word4'] ^ $w[0][3]
);
for ($round=1; $round < $this->Nr; $round++) {
$state=array(
$t0[$state[0] & 0xFF000000] ^ $t1[$state[1] & 0x00FF0000] ^ $t2[$state[2] & 0x0000FF00] ^ $t3[$state[3] & 0x000000FF] ^ $w[$round][0],
$t0[$state[1] & 0xFF000000] ^ $t1[$state[2] & 0x00FF0000] ^ $t2[$state[3] & 0x0000FF00] ^ $t3[$state[0] & 0x000000FF] ^ $w[$round][1],
$t0[$state[2] & 0xFF000000] ^ $t1[$state[3] & 0x00FF0000] ^ $t2[$state[0] & 0x0000FF00] ^ $t3[$state[1] & 0x000000FF] ^ $w[$round][2],
$t0[$state[3] & 0xFF000000] ^ $t1[$state[0] & 0x00FF0000] ^ $t2[$state[1] & 0x0000FF00] ^ $t3[$state[2] & 0x000000FF] ^ $w[$round][3]
);

}
$state=array(
$this->_subWord($state[0]),
$this->_subWord($state[1]),
$this->_subWord($state[2]),
$this->_subWord($state[3])
);

$state=array(
($state[0] & 0xFF000000) ^ ($state[1] & 0x00FF0000) ^ ($state[2] & 0x0000FF00) ^ ($state[3] & 0x000000FF) ^ $this->w[$this->Nr][0],
($state[1] & 0xFF000000) ^ ($state[2] & 0x00FF0000) ^ ($state[3] & 0x0000FF00) ^ ($state[0] & 0x000000FF) ^ $this->w[$this->Nr][1],
($state[2] & 0xFF000000) ^ ($state[3] & 0x00FF0000) ^ ($state[0] & 0x0000FF00) ^ ($state[1] & 0x000000FF) ^ $this->w[$this->Nr][2],
($state[3] & 0xFF000000) ^ ($state[0] & 0x00FF0000) ^ ($state[1] & 0x0000FF00) ^ ($state[2] & 0x000000FF) ^ $this->w[$this->Nr][3]
);

return pack('N*', $state[0], $state[1], $state[2], $state[3]);
}

function _decryptBlock($in)
{
$state=unpack('N*word', $in);

$Nr=$this->Nr;
$dw=$this->dw;
$dt0=$this->dt0;
$dt1=$this->dt1;
$dt2=$this->dt2;
$dt3=$this->dt3;

$state=array(
$state['word1'] ^ $dw[$this->Nr][0],
$state['word2'] ^ $dw[$this->Nr][1],
$state['word3'] ^ $dw[$this->Nr][2],
$state['word4'] ^ $dw[$this->Nr][3]
);

for ($round=$this->Nr - 1; $round > 0; $round--) {
$state=array(
$dt0[$state[0] & 0xFF000000] ^ $dt1[$state[3] & 0x00FF0000] ^ $dt2[$state[2] & 0x0000FF00] ^ $dt3[$state[1] & 0x000000FF] ^ $dw[$round][0],
$dt0[$state[1] & 0xFF000000] ^ $dt1[$state[0] & 0x00FF0000] ^ $dt2[$state[3] & 0x0000FF00] ^ $dt3[$state[2] & 0x000000FF] ^ $dw[$round][1],
$dt0[$state[2] & 0xFF000000] ^ $dt1[$state[1] & 0x00FF0000] ^ $dt2[$state[0] & 0x0000FF00] ^ $dt3[$state[3] & 0x000000FF] ^ $dw[$round][2],
$dt0[$state[3] & 0xFF000000] ^ $dt1[$state[2] & 0x00FF0000] ^ $dt2[$state[1] & 0x0000FF00] ^ $dt3[$state[0] & 0x000000FF] ^ $dw[$round][3]
);
}

$state=array(
$this->_invSubWord(($state[0] & 0xFF000000) ^ ($state[3] & 0x00FF0000) ^ ($state[2] & 0x0000FF00) ^ ($state[1] & 0x000000FF)) ^ $dw[0][0],
$this->_invSubWord(($state[1] & 0xFF000000) ^ ($state[0] & 0x00FF0000) ^ ($state[3] & 0x0000FF00) ^ ($state[2] & 0x000000FF)) ^ $dw[0][1],
$this->_invSubWord(($state[2] & 0xFF000000) ^ ($state[1] & 0x00FF0000) ^ ($state[0] & 0x0000FF00) ^ ($state[3] & 0x000000FF)) ^ $dw[0][2],
$this->_invSubWord(($state[3] & 0xFF000000) ^ ($state[2] & 0x00FF0000) ^ ($state[1] & 0x0000FF00) ^ ($state[0] & 0x000000FF)) ^ $dw[0][3]
);

return pack('N*', $state[0], $state[1], $state[2], $state[3]);
}
}
?>