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76bfab1303
* Part 1 Removing closing tags when no HTML or other output comes after the last PHP codeblock. * Further removals * nothing --------- Co-authored-by: slawkens <slawkens@gmail.com>
154 lines
4.2 KiB
PHP
154 lines
4.2 KiB
PHP
<?php
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/**#@+
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* @version 0.1.2
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* @since 0.1.2
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*/
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/**
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* @package POT
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* @author Wrzasq <wrzasq@gmail.com>
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* @author Jeroen Derks <jeroen@derks.it>
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* @copyright 2007 - 2008 (C) by Wrzasq
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* @license http://www.gnu.org/licenses/lgpl-3.0.txt GNU Lesser General Public License, Version 3
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* @license http://www.php.net/license/2_02.txt PHP License, Version 2.02
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*/
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/**
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* XTEA encryption/decryption mechanism.
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*
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* <p>
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* This code bases in large part on Jeroen Derks'es Crypt_Xtea's source code.
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* </p>
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*
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* @package POT
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*/
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class OTS_XTEA implements IOTS_Cipher
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{
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/**
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* Encryption key.
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*
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* @var array
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*/
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private $key;
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/**
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* Initializes new encryption session.
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*
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* <p>
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* Note: Your key must be exacly 128bit length (16 characters)! Class will not resize it for you.
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* </p>
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*
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* @param string $key Encryption key to be used.
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*/
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public function __construct($key)
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{
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$this->key = array_values( unpack('V4', $key) );
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}
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/**
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* Encrypt a string with XTEA algorithm.
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*
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* @param string $message Data to encrypt.
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* @return string Encrypted message.
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*/
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public function encrypt($message)
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{
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// resize data to 32 bits
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$n = strlen($message);
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$message = pack('v', $n) . str_pad($message, $n - ($n - 2) % 4 + 4, chr(0) );
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// convert data to long integers
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$message = array_values( unpack('V*', $message) );
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$length = count($message);
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// converts to unsigned integers
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foreach($message as $index => $result)
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{
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if($result < 0)
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{
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$message[$index] += 0xFFFFFFFF + 1;
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}
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}
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// resizes to 64 bits
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if($length % 2 == 1)
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{
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$message[] = 0;
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}
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$result = '';
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// encrypt the long data with the key
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for($i = 0; $i < $length; $i++)
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{
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$sum = 0;
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$delta = 0x9E3779B9;
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$y = $message[$i];
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$z = $message[++$i];
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for($j = 0; $j < 32; $j++)
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{
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$y = OTS_BinaryTools::unsignedAdd($y, OTS_BinaryTools::unsignedAdd( ($z << 4) ^ OTS_BinaryTools::unsignedRightShift($z, 5), $z) ^ OTS_BinaryTools::unsignedAdd($sum, $this->key[$sum & 3]) );
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$sum = OTS_BinaryTools::unsignedAdd($sum, $delta);
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$z = OTS_BinaryTools::unsignedAdd($z, OTS_BinaryTools::unsignedAdd( ($y << 4) ^ OTS_BinaryTools::unsignedRightShift($y, 5), $y) ^ OTS_BinaryTools::unsignedAdd($sum, $this->key[ OTS_BinaryTools::unsignedRightShift($sum, 11) & 3]) );
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}
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// append the enciphered longs to the result
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$result .= pack('VV', $y, $z);
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}
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return $result;
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}
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/**
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* Decrypt XTEA-encrypted string.
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*
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* @param string $message Encrypted message.
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* @return string Decrypted string.
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*/
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public function decrypt($message)
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{
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// convert data to long
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$message = array_values( unpack('V*', $message) );
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$length = count($message);
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// converts to unsigned integers
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foreach($message as $index => $result)
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{
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if($result < 0)
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{
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$message[$index] += 0xFFFFFFFF + 1;
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}
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}
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// decrypt the long data with the key
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$result = '';
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for($i = 0; $i < $length; $i++)
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{
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$sum = 0xC6EF3720;
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$delta = 0x61C88647;
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$y = $message[$i];
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$z = $message[++$i];
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for($j = 0; $j < 32; $j++)
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{
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$z = OTS_BinaryTools::unsignedAdd($z, -( OTS_BinaryTools::unsignedAdd( ($y << 4) ^ OTS_BinaryTools::unsignedRightShift($y, 5), $y) ^ OTS_BinaryTools::unsignedAdd($sum, $this->key[ OTS_BinaryTools::unsignedRightShift($sum, 11) & 3]) ) );
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$sum = OTS_BinaryTools::unsignedAdd($sum, $delta);
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$y = OTS_BinaryTools::unsignedAdd($y, -( OTS_BinaryTools::unsignedAdd( ($z << 4) ^ OTS_BinaryTools::unsignedRightShift($z, 5), $z) ^ OTS_BinaryTools::unsignedAdd($sum, $this->key[$sum & 3]) ) );
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}
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// append the deciphered longs to the result data
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$result .= pack('VV', $y, $z);
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}
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// reads message length
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$offset = unpack('v', $result);
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return substr($result, 2, $offset[1]);
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}
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}
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/**#@-*/
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