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[www-register-wizard.git] / libraries / Encrypt.php
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-<?php  if ( ! defined('BASEPATH')) exit('No direct script access allowed');\r
-/**\r
- * CodeIgniter\r
- *\r
- * An open source application development framework for PHP 4.3.2 or newer\r
- *\r
- * @package            CodeIgniter\r
- * @author             ExpressionEngine Dev Team\r
- * @copyright  Copyright (c) 2008, EllisLab, Inc.\r
- * @license            http://codeigniter.com/user_guide/license.html\r
- * @link               http://codeigniter.com\r
- * @since              Version 1.0\r
- * @filesource\r
- */\r
-\r
-// ------------------------------------------------------------------------\r
-\r
-/**\r
- * CodeIgniter Encryption Class\r
- *\r
- * Provides two-way keyed encoding using XOR Hashing and Mcrypt\r
- *\r
- * @package            CodeIgniter\r
- * @subpackage Libraries\r
- * @category   Libraries\r
- * @author             ExpressionEngine Dev Team\r
- * @link               http://codeigniter.com/user_guide/libraries/encryption.html\r
- */\r
-class CI_Encrypt {\r
-\r
-       var $CI;\r
-       var $encryption_key     = '';\r
-       var $_hash_type = 'sha1';\r
-       var $_mcrypt_exists = FALSE;\r
-       var $_mcrypt_cipher;\r
-       var $_mcrypt_mode;\r
-\r
-       /**\r
-        * Constructor\r
-        *\r
-        * Simply determines whether the mcrypt library exists.\r
-        *\r
-        */\r
-       function CI_Encrypt()\r
-       {\r
-               $this->CI =& get_instance();\r
-               $this->_mcrypt_exists = ( ! function_exists('mcrypt_encrypt')) ? FALSE : TRUE;\r
-               log_message('debug', "Encrypt Class Initialized");\r
-       }\r
-\r
-       // --------------------------------------------------------------------\r
-\r
-       /**\r
-        * Fetch the encryption key\r
-        *\r
-        * Returns it as MD5 in order to have an exact-length 128 bit key.\r
-        * Mcrypt is sensitive to keys that are not the correct length\r
-        *\r
-        * @access      public\r
-        * @param       string\r
-        * @return      string\r
-        */\r
-       function get_key($key = '')\r
-       {\r
-               if ($key == '')\r
-               {\r
-                       if ($this->encryption_key != '')\r
-                       {\r
-                               return $this->encryption_key;\r
-                       }\r
-\r
-                       $CI =& get_instance();\r
-                       $key = $CI->config->item('encryption_key');\r
-\r
-                       if ($key === FALSE)\r
-                       {\r
-                               show_error('In order to use the encryption class requires that you set an encryption key in your config file.');\r
-                       }\r
-               }\r
-\r
-               return md5($key);\r
-       }\r
-\r
-       // --------------------------------------------------------------------\r
-\r
-       /**\r
-        * Set the encryption key\r
-        *\r
-        * @access      public\r
-        * @param       string\r
-        * @return      void\r
-        */\r
-       function set_key($key = '')\r
-       {\r
-               $this->encryption_key = $key;\r
-       }\r
-\r
-       // --------------------------------------------------------------------\r
-\r
-       /**\r
-        * Encode\r
-        *\r
-        * Encodes the message string using bitwise XOR encoding.\r
-        * The key is combined with a random hash, and then it\r
-        * too gets converted using XOR. The whole thing is then run\r
-        * through mcrypt (if supported) using the randomized key.\r
-        * The end result is a double-encrypted message string\r
-        * that is randomized with each call to this function,\r
-        * even if the supplied message and key are the same.\r
-        *\r
-        * @access      public\r
-        * @param       string  the string to encode\r
-        * @param       string  the key\r
-        * @return      string\r
-        */\r
-       function encode($string, $key = '')\r
-       {\r
-               $key = $this->get_key($key);\r
-               $enc = $this->_xor_encode($string, $key);\r
-               \r
-               if ($this->_mcrypt_exists === TRUE)\r
-               {\r
-                       $enc = $this->mcrypt_encode($enc, $key);\r
-               }\r
-               return base64_encode($enc);\r
-       }\r
-\r
-       // --------------------------------------------------------------------\r
-\r
-       /**\r
-        * Decode\r
-        *\r
-        * Reverses the above process\r
-        *\r
-        * @access      public\r
-        * @param       string\r
-        * @param       string\r
-        * @return      string\r
-        */\r
-       function decode($string, $key = '')\r
-       {\r
-               $key = $this->get_key($key);\r
-               \r
-               if (preg_match('/[^a-zA-Z0-9\/\+=]/', $string))\r
-               {\r
-                       return FALSE;\r
-               }\r
-\r
-               $dec = base64_decode($string);\r
-\r
-               if ($this->_mcrypt_exists === TRUE)\r
-               {\r
-                       if (($dec = $this->mcrypt_decode($dec, $key)) === FALSE)\r
-                       {\r
-                               return FALSE;\r
-                       }\r
-               }\r
-\r
-               return $this->_xor_decode($dec, $key);\r
-       }\r
-\r
-       // --------------------------------------------------------------------\r
-\r
-       /**\r
-        * XOR Encode\r
-        *\r
-        * Takes a plain-text string and key as input and generates an\r
-        * encoded bit-string using XOR\r
-        *\r
-        * @access      private\r
-        * @param       string\r
-        * @param       string\r
-        * @return      string\r
-        */\r
-       function _xor_encode($string, $key)\r
-       {\r
-               $rand = '';\r
-               while (strlen($rand) < 32)\r
-               {\r
-                       $rand .= mt_rand(0, mt_getrandmax());\r
-               }\r
-\r
-               $rand = $this->hash($rand);\r
-\r
-               $enc = '';\r
-               for ($i = 0; $i < strlen($string); $i++)\r
-               {                       \r
-                       $enc .= substr($rand, ($i % strlen($rand)), 1).(substr($rand, ($i % strlen($rand)), 1) ^ substr($string, $i, 1));\r
-               }\r
-\r
-               return $this->_xor_merge($enc, $key);\r
-       }\r
-\r
-       // --------------------------------------------------------------------\r
-\r
-       /**\r
-        * XOR Decode\r
-        *\r
-        * Takes an encoded string and key as input and generates the\r
-        * plain-text original message\r
-        *\r
-        * @access      private\r
-        * @param       string\r
-        * @param       string\r
-        * @return      string\r
-        */\r
-       function _xor_decode($string, $key)\r
-       {\r
-               $string = $this->_xor_merge($string, $key);\r
-\r
-               $dec = '';\r
-               for ($i = 0; $i < strlen($string); $i++)\r
-               {\r
-                       $dec .= (substr($string, $i++, 1) ^ substr($string, $i, 1));\r
-               }\r
-\r
-               return $dec;\r
-       }\r
-\r
-       // --------------------------------------------------------------------\r
-\r
-       /**\r
-        * XOR key + string Combiner\r
-        *\r
-        * Takes a string and key as input and computes the difference using XOR\r
-        *\r
-        * @access      private\r
-        * @param       string\r
-        * @param       string\r
-        * @return      string\r
-        */\r
-       function _xor_merge($string, $key)\r
-       {\r
-               $hash = $this->hash($key);\r
-               $str = '';\r
-               for ($i = 0; $i < strlen($string); $i++)\r
-               {\r
-                       $str .= substr($string, $i, 1) ^ substr($hash, ($i % strlen($hash)), 1);\r
-               }\r
-\r
-               return $str;\r
-       }\r
-\r
-       // --------------------------------------------------------------------\r
-\r
-       /**\r
-        * Encrypt using Mcrypt\r
-        *\r
-        * @access      public\r
-        * @param       string\r
-        * @param       string\r
-        * @return      string\r
-        */\r
-       function mcrypt_encode($data, $key)\r
-       {\r
-               $init_size = mcrypt_get_iv_size($this->_get_cipher(), $this->_get_mode());\r
-               $init_vect = mcrypt_create_iv($init_size, MCRYPT_RAND);\r
-               return $this->_add_cipher_noise($init_vect.mcrypt_encrypt($this->_get_cipher(), $key, $data, $this->_get_mode(), $init_vect), $key);\r
-       }\r
-\r
-       // --------------------------------------------------------------------\r
-\r
-       /**\r
-        * Decrypt using Mcrypt\r
-        *\r
-        * @access      public\r
-        * @param       string\r
-        * @param       string\r
-        * @return      string\r
-        */\r
-       function mcrypt_decode($data, $key)\r
-       {\r
-               $data = $this->_remove_cipher_noise($data, $key);\r
-               $init_size = mcrypt_get_iv_size($this->_get_cipher(), $this->_get_mode());\r
-\r
-               if ($init_size > strlen($data))\r
-               {\r
-                       return FALSE;\r
-               }\r
-\r
-               $init_vect = substr($data, 0, $init_size);\r
-               $data = substr($data, $init_size);\r
-               return rtrim(mcrypt_decrypt($this->_get_cipher(), $key, $data, $this->_get_mode(), $init_vect), "\0");\r
-       }\r
-\r
-       // --------------------------------------------------------------------\r
-\r
-       /**\r
-        * Adds permuted noise to the IV + encrypted data to protect\r
-        * against Man-in-the-middle attacks on CBC mode ciphers\r
-        * http://www.ciphersbyritter.com/GLOSSARY.HTM#IV\r
-        *\r
-        * Function description\r
-        *\r
-        * @access      private\r
-        * @param       string\r
-        * @param       string\r
-        * @return      string\r
-        */\r
-       function _add_cipher_noise($data, $key)\r
-       {\r
-               $keyhash = $this->hash($key);\r
-               $keylen = strlen($keyhash);\r
-               $str = '';\r
-\r
-               for ($i = 0, $j = 0, $len = strlen($data); $i < $len; ++$i, ++$j)\r
-               {\r
-                       if ($j >= $keylen)\r
-                       {\r
-                               $j = 0;\r
-                       }\r
-\r
-                       $str .= chr((ord($data[$i]) + ord($keyhash[$j])) % 256);\r
-               }\r
-\r
-               return $str;\r
-       }\r
-\r
-       // --------------------------------------------------------------------\r
-\r
-       /**\r
-        * Removes permuted noise from the IV + encrypted data, reversing\r
-        * _add_cipher_noise()\r
-        *\r
-        * Function description\r
-        *\r
-        * @access      public\r
-        * @param       type\r
-        * @return      type\r
-        */\r
-       function _remove_cipher_noise($data, $key)\r
-       {\r
-               $keyhash = $this->hash($key);\r
-               $keylen = strlen($keyhash);\r
-               $str = '';\r
-\r
-               for ($i = 0, $j = 0, $len = strlen($data); $i < $len; ++$i, ++$j)\r
-               {\r
-                       if ($j >= $keylen)\r
-                       {\r
-                               $j = 0;\r
-                       }\r
-\r
-                       $temp = ord($data[$i]) - ord($keyhash[$j]);\r
-\r
-                       if ($temp < 0)\r
-                       {\r
-                               $temp = $temp + 256;\r
-                       }\r
-                       \r
-                       $str .= chr($temp);\r
-               }\r
-\r
-               return $str;\r
-       }\r
-\r
-       // --------------------------------------------------------------------\r
-       \r
-       /**\r
-        * Set the Mcrypt Cipher\r
-        *\r
-        * @access      public\r
-        * @param       constant\r
-        * @return      string\r
-        */\r
-       function set_cipher($cipher)\r
-       {\r
-               $this->_mcrypt_cipher = $cipher;\r
-       }\r
-\r
-       // --------------------------------------------------------------------\r
-\r
-       /**\r
-        * Set the Mcrypt Mode\r
-        *\r
-        * @access      public\r
-        * @param       constant\r
-        * @return      string\r
-        */\r
-       function set_mode($mode)\r
-       {\r
-               $this->_mcrypt_mode = $mode;\r
-       }\r
-\r
-       // --------------------------------------------------------------------\r
-\r
-       /**\r
-        * Get Mcrypt cipher Value\r
-        *\r
-        * @access      private\r
-        * @return      string\r
-        */\r
-       function _get_cipher()\r
-       {\r
-               if ($this->_mcrypt_cipher == '')\r
-               {\r
-                       $this->_mcrypt_cipher = MCRYPT_RIJNDAEL_256;\r
-               }\r
-\r
-               return $this->_mcrypt_cipher;\r
-       }\r
-\r
-       // --------------------------------------------------------------------\r
-\r
-       /**\r
-        * Get Mcrypt Mode Value\r
-        *\r
-        * @access      private\r
-        * @return      string\r
-        */\r
-       function _get_mode()\r
-       {\r
-               if ($this->_mcrypt_mode == '')\r
-               {\r
-                       $this->_mcrypt_mode = MCRYPT_MODE_ECB;\r
-               }\r
-               \r
-               return $this->_mcrypt_mode;\r
-       }\r
-\r
-       // --------------------------------------------------------------------\r
-\r
-       /**\r
-        * Set the Hash type\r
-        *\r
-        * @access      public\r
-        * @param       string\r
-        * @return      string\r
-        */\r
-       function set_hash($type = 'sha1')\r
-       {\r
-               $this->_hash_type = ($type != 'sha1' AND $type != 'md5') ? 'sha1' : $type;\r
-       }\r
-\r
-       // --------------------------------------------------------------------\r
-\r
-       /**\r
-        * Hash encode a string\r
-        *\r
-        * @access      public\r
-        * @param       string\r
-        * @return      string\r
-        */     \r
-       function hash($str)\r
-       {\r
-               return ($this->_hash_type == 'sha1') ? $this->sha1($str) : md5($str);\r
-       }\r
-\r
-       // --------------------------------------------------------------------\r
-\r
-       /**\r
-        * Generate an SHA1 Hash\r
-        *\r
-        * @access      public\r
-        * @param       string\r
-        * @return      string\r
-        */\r
-       function sha1($str)\r
-       {\r
-               if ( ! function_exists('sha1'))\r
-               {\r
-                       if ( ! function_exists('mhash'))\r
-                       {\r
-                               require_once(BASEPATH.'libraries/Sha1'.EXT);\r
-                               $SH = new CI_SHA;\r
-                               return $SH->generate($str);\r
-                       }\r
-                       else\r
-                       {\r
-                               return bin2hex(mhash(MHASH_SHA1, $str));\r
-                       }\r
-               }\r
-               else\r
-               {\r
-                       return sha1($str);\r
-               }\r
-       }\r
-\r
-}\r
-\r
-// END CI_Encrypt class\r
-\r
-/* End of file Encrypt.php */\r
+<?php  if ( ! defined('BASEPATH')) exit('No direct script access allowed');
+/**
+ * CodeIgniter
+ *
+ * An open source application development framework for PHP 4.3.2 or newer
+ *
+ * @package            CodeIgniter
+ * @author             ExpressionEngine Dev Team
+ * @copyright  Copyright (c) 2008 - 2009, EllisLab, Inc.
+ * @license            http://codeigniter.com/user_guide/license.html
+ * @link               http://codeigniter.com
+ * @since              Version 1.0
+ * @filesource
+ */
+
+// ------------------------------------------------------------------------
+
+/**
+ * CodeIgniter Encryption Class
+ *
+ * Provides two-way keyed encoding using XOR Hashing and Mcrypt
+ *
+ * @package            CodeIgniter
+ * @subpackage Libraries
+ * @category   Libraries
+ * @author             ExpressionEngine Dev Team
+ * @link               http://codeigniter.com/user_guide/libraries/encryption.html
+ */
+class CI_Encrypt {
+
+       var $CI;
+       var $encryption_key     = '';
+       var $_hash_type = 'sha1';
+       var $_mcrypt_exists = FALSE;
+       var $_mcrypt_cipher;
+       var $_mcrypt_mode;
+
+       /**
+        * Constructor
+        *
+        * Simply determines whether the mcrypt library exists.
+        *
+        */
+       function CI_Encrypt()
+       {
+               $this->CI =& get_instance();
+               $this->_mcrypt_exists = ( ! function_exists('mcrypt_encrypt')) ? FALSE : TRUE;
+               log_message('debug', "Encrypt Class Initialized");
+       }
+
+       // --------------------------------------------------------------------
+
+       /**
+        * Fetch the encryption key
+        *
+        * Returns it as MD5 in order to have an exact-length 128 bit key.
+        * Mcrypt is sensitive to keys that are not the correct length
+        *
+        * @access      public
+        * @param       string
+        * @return      string
+        */
+       function get_key($key = '')
+       {
+               if ($key == '')
+               {
+                       if ($this->encryption_key != '')
+                       {
+                               return $this->encryption_key;
+                       }
+
+                       $CI =& get_instance();
+                       $key = $CI->config->item('encryption_key');
+
+                       if ($key === FALSE)
+                       {
+                               show_error('In order to use the encryption class requires that you set an encryption key in your config file.');
+                       }
+               }
+
+               return md5($key);
+       }
+
+       // --------------------------------------------------------------------
+
+       /**
+        * Set the encryption key
+        *
+        * @access      public
+        * @param       string
+        * @return      void
+        */
+       function set_key($key = '')
+       {
+               $this->encryption_key = $key;
+       }
+
+       // --------------------------------------------------------------------
+
+       /**
+        * Encode
+        *
+        * Encodes the message string using bitwise XOR encoding.
+        * The key is combined with a random hash, and then it
+        * too gets converted using XOR. The whole thing is then run
+        * through mcrypt (if supported) using the randomized key.
+        * The end result is a double-encrypted message string
+        * that is randomized with each call to this function,
+        * even if the supplied message and key are the same.
+        *
+        * @access      public
+        * @param       string  the string to encode
+        * @param       string  the key
+        * @return      string
+        */
+       function encode($string, $key = '')
+       {
+               $key = $this->get_key($key);
+               $enc = $this->_xor_encode($string, $key);
+               
+               if ($this->_mcrypt_exists === TRUE)
+               {
+                       $enc = $this->mcrypt_encode($enc, $key);
+               }
+               return base64_encode($enc);
+       }
+
+       // --------------------------------------------------------------------
+
+       /**
+        * Decode
+        *
+        * Reverses the above process
+        *
+        * @access      public
+        * @param       string
+        * @param       string
+        * @return      string
+        */
+       function decode($string, $key = '')
+       {
+               $key = $this->get_key($key);
+               
+               if (preg_match('/[^a-zA-Z0-9\/\+=]/', $string))
+               {
+                       return FALSE;
+               }
+
+               $dec = base64_decode($string);
+
+               if ($this->_mcrypt_exists === TRUE)
+               {
+                       if (($dec = $this->mcrypt_decode($dec, $key)) === FALSE)
+                       {
+                               return FALSE;
+                       }
+               }
+
+               return $this->_xor_decode($dec, $key);
+       }
+
+       // --------------------------------------------------------------------
+
+       /**
+        * XOR Encode
+        *
+        * Takes a plain-text string and key as input and generates an
+        * encoded bit-string using XOR
+        *
+        * @access      private
+        * @param       string
+        * @param       string
+        * @return      string
+        */
+       function _xor_encode($string, $key)
+       {
+               $rand = '';
+               while (strlen($rand) < 32)
+               {
+                       $rand .= mt_rand(0, mt_getrandmax());
+               }
+
+               $rand = $this->hash($rand);
+
+               $enc = '';
+               for ($i = 0; $i < strlen($string); $i++)
+               {                       
+                       $enc .= substr($rand, ($i % strlen($rand)), 1).(substr($rand, ($i % strlen($rand)), 1) ^ substr($string, $i, 1));
+               }
+
+               return $this->_xor_merge($enc, $key);
+       }
+
+       // --------------------------------------------------------------------
+
+       /**
+        * XOR Decode
+        *
+        * Takes an encoded string and key as input and generates the
+        * plain-text original message
+        *
+        * @access      private
+        * @param       string
+        * @param       string
+        * @return      string
+        */
+       function _xor_decode($string, $key)
+       {
+               $string = $this->_xor_merge($string, $key);
+
+               $dec = '';
+               for ($i = 0; $i < strlen($string); $i++)
+               {
+                       $dec .= (substr($string, $i++, 1) ^ substr($string, $i, 1));
+               }
+
+               return $dec;
+       }
+
+       // --------------------------------------------------------------------
+
+       /**
+        * XOR key + string Combiner
+        *
+        * Takes a string and key as input and computes the difference using XOR
+        *
+        * @access      private
+        * @param       string
+        * @param       string
+        * @return      string
+        */
+       function _xor_merge($string, $key)
+       {
+               $hash = $this->hash($key);
+               $str = '';
+               for ($i = 0; $i < strlen($string); $i++)
+               {
+                       $str .= substr($string, $i, 1) ^ substr($hash, ($i % strlen($hash)), 1);
+               }
+
+               return $str;
+       }
+
+       // --------------------------------------------------------------------
+
+       /**
+        * Encrypt using Mcrypt
+        *
+        * @access      public
+        * @param       string
+        * @param       string
+        * @return      string
+        */
+       function mcrypt_encode($data, $key)
+       {
+               $init_size = mcrypt_get_iv_size($this->_get_cipher(), $this->_get_mode());
+               $init_vect = mcrypt_create_iv($init_size, MCRYPT_RAND);
+               return $this->_add_cipher_noise($init_vect.mcrypt_encrypt($this->_get_cipher(), $key, $data, $this->_get_mode(), $init_vect), $key);
+       }
+
+       // --------------------------------------------------------------------
+
+       /**
+        * Decrypt using Mcrypt
+        *
+        * @access      public
+        * @param       string
+        * @param       string
+        * @return      string
+        */
+       function mcrypt_decode($data, $key)
+       {
+               $data = $this->_remove_cipher_noise($data, $key);
+               $init_size = mcrypt_get_iv_size($this->_get_cipher(), $this->_get_mode());
+
+               if ($init_size > strlen($data))
+               {
+                       return FALSE;
+               }
+
+               $init_vect = substr($data, 0, $init_size);
+               $data = substr($data, $init_size);
+               return rtrim(mcrypt_decrypt($this->_get_cipher(), $key, $data, $this->_get_mode(), $init_vect), "\0");
+       }
+
+       // --------------------------------------------------------------------
+
+       /**
+        * Adds permuted noise to the IV + encrypted data to protect
+        * against Man-in-the-middle attacks on CBC mode ciphers
+        * http://www.ciphersbyritter.com/GLOSSARY.HTM#IV
+        *
+        * Function description
+        *
+        * @access      private
+        * @param       string
+        * @param       string
+        * @return      string
+        */
+       function _add_cipher_noise($data, $key)
+       {
+               $keyhash = $this->hash($key);
+               $keylen = strlen($keyhash);
+               $str = '';
+
+               for ($i = 0, $j = 0, $len = strlen($data); $i < $len; ++$i, ++$j)
+               {
+                       if ($j >= $keylen)
+                       {
+                               $j = 0;
+                       }
+
+                       $str .= chr((ord($data[$i]) + ord($keyhash[$j])) % 256);
+               }
+
+               return $str;
+       }
+
+       // --------------------------------------------------------------------
+
+       /**
+        * Removes permuted noise from the IV + encrypted data, reversing
+        * _add_cipher_noise()
+        *
+        * Function description
+        *
+        * @access      public
+        * @param       type
+        * @return      type
+        */
+       function _remove_cipher_noise($data, $key)
+       {
+               $keyhash = $this->hash($key);
+               $keylen = strlen($keyhash);
+               $str = '';
+
+               for ($i = 0, $j = 0, $len = strlen($data); $i < $len; ++$i, ++$j)
+               {
+                       if ($j >= $keylen)
+                       {
+                               $j = 0;
+                       }
+
+                       $temp = ord($data[$i]) - ord($keyhash[$j]);
+
+                       if ($temp < 0)
+                       {
+                               $temp = $temp + 256;
+                       }
+                       
+                       $str .= chr($temp);
+               }
+
+               return $str;
+       }
+
+       // --------------------------------------------------------------------
+       
+       /**
+        * Set the Mcrypt Cipher
+        *
+        * @access      public
+        * @param       constant
+        * @return      string
+        */
+       function set_cipher($cipher)
+       {
+               $this->_mcrypt_cipher = $cipher;
+       }
+
+       // --------------------------------------------------------------------
+
+       /**
+        * Set the Mcrypt Mode
+        *
+        * @access      public
+        * @param       constant
+        * @return      string
+        */
+       function set_mode($mode)
+       {
+               $this->_mcrypt_mode = $mode;
+       }
+
+       // --------------------------------------------------------------------
+
+       /**
+        * Get Mcrypt cipher Value
+        *
+        * @access      private
+        * @return      string
+        */
+       function _get_cipher()
+       {
+               if ($this->_mcrypt_cipher == '')
+               {
+                       $this->_mcrypt_cipher = MCRYPT_RIJNDAEL_256;
+               }
+
+               return $this->_mcrypt_cipher;
+       }
+
+       // --------------------------------------------------------------------
+
+       /**
+        * Get Mcrypt Mode Value
+        *
+        * @access      private
+        * @return      string
+        */
+       function _get_mode()
+       {
+               if ($this->_mcrypt_mode == '')
+               {
+                       $this->_mcrypt_mode = MCRYPT_MODE_ECB;
+               }
+               
+               return $this->_mcrypt_mode;
+       }
+
+       // --------------------------------------------------------------------
+
+       /**
+        * Set the Hash type
+        *
+        * @access      public
+        * @param       string
+        * @return      string
+        */
+       function set_hash($type = 'sha1')
+       {
+               $this->_hash_type = ($type != 'sha1' AND $type != 'md5') ? 'sha1' : $type;
+       }
+
+       // --------------------------------------------------------------------
+
+       /**
+        * Hash encode a string
+        *
+        * @access      public
+        * @param       string
+        * @return      string
+        */     
+       function hash($str)
+       {
+               return ($this->_hash_type == 'sha1') ? $this->sha1($str) : md5($str);
+       }
+
+       // --------------------------------------------------------------------
+
+       /**
+        * Generate an SHA1 Hash
+        *
+        * @access      public
+        * @param       string
+        * @return      string
+        */
+       function sha1($str)
+       {
+               if ( ! function_exists('sha1'))
+               {
+                       if ( ! function_exists('mhash'))
+                       {
+                               require_once(BASEPATH.'libraries/Sha1'.EXT);
+                               $SH = new CI_SHA;
+                               return $SH->generate($str);
+                       }
+                       else
+                       {
+                               return bin2hex(mhash(MHASH_SHA1, $str));
+                       }
+               }
+               else
+               {
+                       return sha1($str);
+               }
+       }
+
+}
+
+// END CI_Encrypt class
+
+/* End of file Encrypt.php */
 /* Location: ./system/libraries/Encrypt.php */
\ No newline at end of file