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sources/apps/files_encryption/3rdparty/Crypt_Blowfish/Blowfish.php 8.21 KB
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  <?php
  /* vim: set expandtab tabstop=4 shiftwidth=4 softtabstop=4: */
  
  /**
   * Crypt_Blowfish allows for encryption and decryption on the fly using
   * the Blowfish algorithm. Crypt_Blowfish does not require the mcrypt
   * PHP extension, it uses only PHP.
   * Crypt_Blowfish support encryption/decryption with or without a secret key.
   *
   *
   * PHP versions 4 and 5
   *
   * LICENSE: This source file is subject to version 3.0 of the PHP license
   * that is available through the world-wide-web at the following URI:
   * http://www.php.net/license/3_0.txt.  If you did not receive a copy of
   * the PHP License and are unable to obtain it through the web, please
   * send a note to license@php.net so we can mail you a copy immediately.
   *
   * @category   Encryption
   * @package    Crypt_Blowfish
   * @author     Matthew Fonda <mfonda@php.net>
   * @copyright  2005 Matthew Fonda
   * @license    http://www.php.net/license/3_0.txt  PHP License 3.0
   * @version    CVS: $Id: Blowfish.php,v 1.81 2005/05/30 18:40:36 mfonda Exp $
   * @link       http://pear.php.net/package/Crypt_Blowfish
   */
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  require_once 'PEAR.php';
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  /**
   *
   * Example usage:
   * $bf = new Crypt_Blowfish('some secret key!');
   * $encrypted = $bf->encrypt('this is some example plain text');
   * $plaintext = $bf->decrypt($encrypted);
   * echo "plain text: $plaintext";
   *
   *
   * @category   Encryption
   * @package    Crypt_Blowfish
   * @author     Matthew Fonda <mfonda@php.net>
   * @copyright  2005 Matthew Fonda
   * @license    http://www.php.net/license/3_0.txt  PHP License 3.0
   * @link       http://pear.php.net/package/Crypt_Blowfish
   * @version    @package_version@
   * @access     public
   */
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  class Legacy_Crypt_Blowfish
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  {
      /**
       * P-Array contains 18 32-bit subkeys
       *
       * @var array
       * @access private
       */
      var $_P = array();
      
      
      /**
       * Array of four S-Blocks each containing 256 32-bit entries
       *
       * @var array
       * @access private
       */
      var $_S = array();
  
      /**
       * Mcrypt td resource
       *
       * @var resource
       * @access private
       */
      var $_td = null;
  
      /**
       * Initialization vector
       *
       * @var string
       * @access private
       */
      var $_iv = null;
  
      
      /**
       * Crypt_Blowfish Constructor
       * Initializes the Crypt_Blowfish object, and gives a sets
       * the secret key
       *
       * @param string $key
       * @access public
       */
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      function Legacy_Crypt_Blowfish($key)
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      {
          if (extension_loaded('mcrypt')) {
              $this->_td = mcrypt_module_open(MCRYPT_BLOWFISH, '', 'ecb', '');
              $this->_iv = mcrypt_create_iv(8, MCRYPT_RAND);
          }
          $this->setKey($key);
      }
      
      /**
       * Deprecated isReady method
       *
       * @return bool
       * @access public
       * @deprecated
       */
      function isReady()
      {
          return true;
      }
      
      /**
       * Deprecated init method - init is now a private
       * method and has been replaced with _init
       *
       * @return bool
       * @access public
       * @deprecated
       * @see Crypt_Blowfish::_init()
       */
      function init()
      {
          $this->_init();
      }
      
      /**
       * Initializes the Crypt_Blowfish object
       *
       * @access private
       */
      function _init()
      {
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          $defaults = new \Crypt_Blowfish_DefaultKey();
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          $this->_P = $defaults->P;
          $this->_S = $defaults->S;
      }
              
      /**
       * Enciphers a single 64 bit block
       *
       * @param int &$Xl
       * @param int &$Xr
       * @access private
       */
      function _encipher(&$Xl, &$Xr)
      {
          for ($i = 0; $i < 16; $i++) {
              $temp = $Xl ^ $this->_P[$i];
              $Xl = ((($this->_S[0][($temp>>24) & 255] +
                              $this->_S[1][($temp>>16) & 255]) ^
                              $this->_S[2][($temp>>8) & 255]) +
                              $this->_S[3][$temp & 255]) ^ $Xr;
              $Xr = $temp;
          }
          $Xr = $Xl ^ $this->_P[16];
          $Xl = $temp ^ $this->_P[17];
      }
      
      
      /**
       * Deciphers a single 64 bit block
       *
       * @param int &$Xl
       * @param int &$Xr
       * @access private
       */
      function _decipher(&$Xl, &$Xr)
      {
          for ($i = 17; $i > 1; $i--) {
              $temp = $Xl ^ $this->_P[$i];
              $Xl = ((($this->_S[0][($temp>>24) & 255] +
                              $this->_S[1][($temp>>16) & 255]) ^
                              $this->_S[2][($temp>>8) & 255]) +
                              $this->_S[3][$temp & 255]) ^ $Xr;
              $Xr = $temp;
          }
          $Xr = $Xl ^ $this->_P[1];
          $Xl = $temp ^ $this->_P[0];
      }
      
      
      /**
       * Encrypts a string
       *
       * @param string $plainText
       * @return string Returns cipher text on success, PEAR_Error on failure
       * @access public
       */
      function encrypt($plainText)
      {
          if (!is_string($plainText)) {
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              \PEAR::raiseError('Plain text must be a string', 0, PEAR_ERROR_DIE);
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          }
  
          if (extension_loaded('mcrypt')) {
              return mcrypt_generic($this->_td, $plainText);
          }
  
          $cipherText = '';
          $len = strlen($plainText);
          $plainText .= str_repeat(chr(0),(8 - ($len%8))%8);
          for ($i = 0; $i < $len; $i += 8) {
              list(,$Xl,$Xr) = unpack("N2",substr($plainText,$i,8));
              $this->_encipher($Xl, $Xr);
              $cipherText .= pack("N2", $Xl, $Xr);
          }
          return $cipherText;
      }
      
      
      /**
       * Decrypts an encrypted string
       *
       * @param string $cipherText
       * @return string Returns plain text on success, PEAR_Error on failure
       * @access public
       */
      function decrypt($cipherText)
      {
          if (!is_string($cipherText)) {
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              \PEAR::raiseError('Cipher text must be a string', 1, PEAR_ERROR_DIE);
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          }
  
          if (extension_loaded('mcrypt')) {
              return mdecrypt_generic($this->_td, $cipherText);
          }
  
          $plainText = '';
          $len = strlen($cipherText);
          $cipherText .= str_repeat(chr(0),(8 - ($len%8))%8);
          for ($i = 0; $i < $len; $i += 8) {
              list(,$Xl,$Xr) = unpack("N2",substr($cipherText,$i,8));
              $this->_decipher($Xl, $Xr);
              $plainText .= pack("N2", $Xl, $Xr);
          }
          return $plainText;
      }
      
      
      /**
       * Sets the secret key
       * The key must be non-zero, and less than or equal to
       * 56 characters in length.
       *
       * @param string $key
       * @return bool  Returns true on success, PEAR_Error on failure
       * @access public
       */
      function setKey($key)
      {
          if (!is_string($key)) {
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              \PEAR::raiseError('Key must be a string', 2, PEAR_ERROR_DIE);
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          }
  
          $len = strlen($key);
  
          if ($len > 56 || $len == 0) {
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              \PEAR::raiseError('Key must be less than 56 characters and non-zero. Supplied key length: ' . $len, 3, PEAR_ERROR_DIE);
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          }
  
          if (extension_loaded('mcrypt')) {
              mcrypt_generic_init($this->_td, $key, $this->_iv);
              return true;
          }
  
          require_once 'Blowfish/DefaultKey.php';
          $this->_init();
          
          $k = 0;
          $data = 0;
          $datal = 0;
          $datar = 0;
          
          for ($i = 0; $i < 18; $i++) {
              $data = 0;
              for ($j = 4; $j > 0; $j--) {
                      $data = $data << 8 | ord($key{$k});
                      $k = ($k+1) % $len;
              }
              $this->_P[$i] ^= $data;
          }
          
          for ($i = 0; $i <= 16; $i += 2) {
              $this->_encipher($datal, $datar);
              $this->_P[$i] = $datal;
              $this->_P[$i+1] = $datar;
          }
          for ($i = 0; $i < 256; $i += 2) {
              $this->_encipher($datal, $datar);
              $this->_S[0][$i] = $datal;
              $this->_S[0][$i+1] = $datar;
          }
          for ($i = 0; $i < 256; $i += 2) {
              $this->_encipher($datal, $datar);
              $this->_S[1][$i] = $datal;
              $this->_S[1][$i+1] = $datar;
          }
          for ($i = 0; $i < 256; $i += 2) {
              $this->_encipher($datal, $datar);
              $this->_S[2][$i] = $datal;
              $this->_S[2][$i+1] = $datar;
          }
          for ($i = 0; $i < 256; $i += 2) {
              $this->_encipher($datal, $datar);
              $this->_S[3][$i] = $datal;
              $this->_S[3][$i+1] = $datar;
          }
          
          return true;
      }
      
  }