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-<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
-/**
- * CodeIgniter
- *
- * An open source application development framework for PHP 5.1.6 or newer
- *
- * NOTICE OF LICENSE
- *
- * Licensed under the Open Software License version 3.0
- *
- * This source file is subject to the Open Software License (OSL 3.0) that is
- * bundled with this package in the files license.txt / license.rst. It is
- * also available through the world wide web at this URL:
- * http://opensource.org/licenses/OSL-3.0
- * If you did not receive a copy of the license and are unable to obtain it
- * through the world wide web, please send an email to
- * licensing@ellislab.com so we can send you a copy immediately.
- *
- * @package CodeIgniter
- * @author EllisLab Dev Team
- * @copyright Copyright (c) 2008 - 2011, EllisLab, Inc. (http://ellislab.com/)
- * @license http://opensource.org/licenses/OSL-3.0 Open Software License (OSL 3.0)
- * @link http://codeigniter.com
- * @since Version 1.0
- * @filesource
- */
-
-// ------------------------------------------------------------------------
-
-/**
- * SHA1 Encoding Class
- *
- * Purpose: Provides 160 bit hashing using The Secure Hash Algorithm
- * developed at the National Institute of Standards and Technology. The 40
- * character SHA1 message hash is computationally infeasible to crack.
- *
- * This class is a fallback for servers that are not running PHP greater than
- * 4.3, or do not have the MHASH library.
- *
- * This class is based on two scripts:
- *
- * Marcus Campbell's PHP implementation (GNU license)
- * http://www.tecknik.net/sha-1/
- *
- * ...which is based on Paul Johnston's JavaScript version
- * (BSD license). http://pajhome.org.uk/
- *
- * I encapsulated the functions and wrote one additional method to fix
- * a hex conversion bug. - Rick Ellis
- *
- * @package CodeIgniter
- * @subpackage Libraries
- * @category Encryption
- * @author EllisLab Dev Team
- * @link http://codeigniter.com/user_guide/libraries/encryption.html
- */
-class CI_SHA1 {
-
- public function __construct()
- {
- log_message('debug', "SHA1 Class Initialized");
- }
-
- /**
- * Generate the Hash
- *
- * @access public
- * @param string
- * @return string
- */
- function generate($str)
- {
- $n = ((strlen($str) + 8) >> 6) + 1;
-
- for ($i = 0; $i < $n * 16; $i++)
- {
- $x[$i] = 0;
- }
-
- for ($i = 0; $i < strlen($str); $i++)
- {
- $x[$i >> 2] |= ord(substr($str, $i, 1)) << (24 - ($i % 4) * 8);
- }
-
- $x[$i >> 2] |= 0x80 << (24 - ($i % 4) * 8);
-
- $x[$n * 16 - 1] = strlen($str) * 8;
-
- $a = 1732584193;
- $b = -271733879;
- $c = -1732584194;
- $d = 271733878;
- $e = -1009589776;
-
- for ($i = 0; $i < count($x); $i += 16)
- {
- $olda = $a;
- $oldb = $b;
- $oldc = $c;
- $oldd = $d;
- $olde = $e;
-
- for ($j = 0; $j < 80; $j++)
- {
- if ($j < 16)
- {
- $w[$j] = $x[$i + $j];
- }
- else
- {
- $w[$j] = $this->_rol($w[$j - 3] ^ $w[$j - 8] ^ $w[$j - 14] ^ $w[$j - 16], 1);
- }
-
- $t = $this->_safe_add($this->_safe_add($this->_rol($a, 5), $this->_ft($j, $b, $c, $d)), $this->_safe_add($this->_safe_add($e, $w[$j]), $this->_kt($j)));
-
- $e = $d;
- $d = $c;
- $c = $this->_rol($b, 30);
- $b = $a;
- $a = $t;
- }
-
- $a = $this->_safe_add($a, $olda);
- $b = $this->_safe_add($b, $oldb);
- $c = $this->_safe_add($c, $oldc);
- $d = $this->_safe_add($d, $oldd);
- $e = $this->_safe_add($e, $olde);
- }
-
- return $this->_hex($a).$this->_hex($b).$this->_hex($c).$this->_hex($d).$this->_hex($e);
- }
-
- // --------------------------------------------------------------------
-
- /**
- * Convert a decimal to hex
- *
- * @access private
- * @param string
- * @return string
- */
- function _hex($str)
- {
- $str = dechex($str);
-
- if (strlen($str) == 7)
- {
- $str = '0'.$str;
- }
-
- return $str;
- }
-
- // --------------------------------------------------------------------
-
- /**
- * Return result based on iteration
- *
- * @access private
- * @return string
- */
- function _ft($t, $b, $c, $d)
- {
- if ($t < 20)
- return ($b & $c) | ((~$b) & $d);
- if ($t < 40)
- return $b ^ $c ^ $d;
- if ($t < 60)
- return ($b & $c) | ($b & $d) | ($c & $d);
-
- return $b ^ $c ^ $d;
- }
-
- // --------------------------------------------------------------------
-
- /**
- * Determine the additive constant
- *
- * @access private
- * @return string
- */
- function _kt($t)
- {
- if ($t < 20)
- {
- return 1518500249;
- }
- else if ($t < 40)
- {
- return 1859775393;
- }
- else if ($t < 60)
- {
- return -1894007588;
- }
- else
- {
- return -899497514;
- }
- }
-
- // --------------------------------------------------------------------
-
- /**
- * Add integers, wrapping at 2^32
- *
- * @access private
- * @return string
- */
- function _safe_add($x, $y)
- {
- $lsw = ($x & 0xFFFF) + ($y & 0xFFFF);
- $msw = ($x >> 16) + ($y >> 16) + ($lsw >> 16);
-
- return ($msw << 16) | ($lsw & 0xFFFF);
- }
-
- // --------------------------------------------------------------------
-
- /**
- * Bitwise rotate a 32-bit number
- *
- * @access private
- * @return integer
- */
- function _rol($num, $cnt)
- {
- return ($num << $cnt) | $this->_zero_fill($num, 32 - $cnt);
- }
-
- // --------------------------------------------------------------------
-
- /**
- * Pad string with zero
- *
- * @access private
- * @return string
- */
- function _zero_fill($a, $b)
- {
- $bin = decbin($a);
-
- if (strlen($bin) < $b)
- {
- $bin = 0;
- }
- else
- {
- $bin = substr($bin, 0, strlen($bin) - $b);
- }
-
- for ($i=0; $i < $b; $i++)
- {
- $bin = "0".$bin;
- }
-
- return bindec($bin);
- }
-}
-// END CI_SHA
-
-/* End of file Sha1.php */
-/* Location: ./system/libraries/Sha1.php */