FM / Crypt

/home/desid573/public_html/tollster/vendor/phpseclib/phpseclib/phpseclib/Crypt/

/home/desid573/public_html/tollster/vendor/phpseclib/phpseclib/phpseclib/Crypt

Name	Size	Mode	Actions
AES.php	3701	0644	edit dl rm
Base.php	97220	0644	edit dl rm
Blowfish.php	26344	0644	edit dl rm
DES.php	71491	0644	edit dl rm
Hash.php	27453	0644	edit dl rm
Random.php	12165	0644	edit dl rm
RC2.php	22544	0644	edit dl rm
RC4.php	8754	0644	edit dl rm
Rijndael.php	41781	0644	edit dl rm
RSA.php	105816	0644	edit dl rm
TripleDES.php	13978	0644	edit dl rm
Twofish.php	37062	0644	edit dl rm

Edit: /home/desid573/public_html/tollster/vendor/phpseclib/phpseclib/phpseclib/Crypt/RC4.php (8754B)

<?php

/**
 * Pure-PHP implementation of RC4.
 *
 * Uses mcrypt, if available, and an internal implementation, otherwise.
 *
 * PHP version 5
 *
 * Useful resources are as follows:
 *
 *  - {@link http://www.mozilla.org/projects/security/pki/nss/draft-kaukonen-cipher-arcfour-03.txt ARCFOUR Algorithm}
 *  - {@link http://en.wikipedia.org/wiki/RC4 - Wikipedia: RC4}
 *
 * RC4 is also known as ARCFOUR or ARC4.  The reason is elaborated upon at Wikipedia.  This class is named RC4 and not
 * ARCFOUR or ARC4 because RC4 is how it is referred to in the SSH1 specification.
 *
 * Here's a short example of how to use this library:
 * <code>
 * <?php
 *    include 'vendor/autoload.php';
 *
 *    $rc4 = new \phpseclib\Crypt\RC4();
 *
 *    $rc4->setKey('abcdefgh');
 *
 *    $size = 10 * 1024;
 *    $plaintext = '';
 *    for ($i = 0; $i < $size; $i++) {
 *        $plaintext.= 'a';
 *    }
 *
 *    echo $rc4->decrypt($rc4->encrypt($plaintext));
 * ?>
 * </code>
 *
 * @category  Crypt
 * @package   RC4
 * @author    Jim Wigginton <terrafrost@php.net>
 * @copyright 2007 Jim Wigginton
 * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
 * @link      http://phpseclib.sourceforge.net
 */

namespace phpseclib\Crypt;

/**
 * Pure-PHP implementation of RC4.
 *
 * @package RC4
 * @author  Jim Wigginton <terrafrost@php.net>
 * @access  public
 */
class RC4 extends Base
{
    /**#@+
     * @access private
     * @see \phpseclib\Crypt\RC4::_crypt()
    */
    const ENCRYPT = 0;
    const DECRYPT = 1;
    /**#@-*/

/**
     * Block Length of the cipher
     *
     * RC4 is a stream cipher
     * so we the block_size to 0
     *
     * @see \phpseclib\Crypt\Base::block_size
     * @var int
     * @access private
     */
    var $block_size = 0;

/**
     * Key Length (in bytes)
     *
     * @see \phpseclib\Crypt\RC4::setKeyLength()
     * @var int
     * @access private
     */
    var $key_length = 128; // = 1024 bits

/**
     * The mcrypt specific name of the cipher
     *
     * @see \phpseclib\Crypt\Base::cipher_name_mcrypt
     * @var string
     * @access private
     */
    var $cipher_name_mcrypt = 'arcfour';

/**
     * Holds whether performance-optimized $inline_crypt() can/should be used.
     *
     * @see \phpseclib\Crypt\Base::inline_crypt
     * @var mixed
     * @access private
     */
    var $use_inline_crypt = false; // currently not available

/**
     * The Key
     *
     * @see self::setKey()
     * @var string
     * @access private
     */
    var $key;

/**
     * The Key Stream for decryption and encryption
     *
     * @see self::setKey()
     * @var array
     * @access private
     */
    var $stream;

/**
     * Default Constructor.
     *
     * Determines whether or not the mcrypt extension should be used.
     *
     * @see \phpseclib\Crypt\Base::__construct()
     * @return \phpseclib\Crypt\RC4
     * @access public
     */
    function __construct()
    {
        parent::__construct(Base::MODE_STREAM);
    }

/**
     * Test for engine validity
     *
     * This is mainly just a wrapper to set things up for \phpseclib\Crypt\Base::isValidEngine()
     *
     * @see \phpseclib\Crypt\Base::__construct()
     * @param int $engine
     * @access public
     * @return bool
     */
    function isValidEngine($engine)
    {
        if ($engine == Base::ENGINE_OPENSSL) {
            if (version_compare(PHP_VERSION, '5.3.7') >= 0) {
                $this->cipher_name_openssl = 'rc4-40';
            } else {
                switch (strlen($this->key)) {
                    case 5:
                        $this->cipher_name_openssl = 'rc4-40';
                        break;
                    case 8:
                        $this->cipher_name_openssl = 'rc4-64';
                        break;
                    case 16:
                        $this->cipher_name_openssl = 'rc4';
                        break;
                    default:
                        return false;
                }
            }
        }

return parent::isValidEngine($engine);
    }

/**
     * Dummy function.
     *
     * Some protocols, such as WEP, prepend an "initialization vector" to the key, effectively creating a new key [1].
     * If you need to use an initialization vector in this manner, feel free to prepend it to the key, yourself, before
     * calling setKey().
     *
     * [1] WEP's initialization vectors (IV's) are used in a somewhat insecure way.  Since, in that protocol,
     * the IV's are relatively easy to predict, an attack described by
     * {@link http://www.drizzle.com/~aboba/IEEE/rc4_ksaproc.pdf Scott Fluhrer, Itsik Mantin, and Adi Shamir}
     * can be used to quickly guess at the rest of the key.  The following links elaborate:
     *
     * {@link http://www.rsa.com/rsalabs/node.asp?id=2009 http://www.rsa.com/rsalabs/node.asp?id=2009}
     * {@link http://en.wikipedia.org/wiki/Related_key_attack http://en.wikipedia.org/wiki/Related_key_attack}
     *
     * @param string $iv
     * @see self::setKey()
     * @access public
     */
    function setIV($iv)
    {
    }

/**
     * Sets the key length
     *
     * Keys can be between 1 and 256 bytes long.
     *
     * @access public
     * @param int $length
     */
    function setKeyLength($length)
    {
        if ($length < 8) {
            $this->key_length = 1;
        } elseif ($length > 2048) {
            $this->key_length = 256;
        } else {
            $this->key_length = $length >> 3;
        }

parent::setKeyLength($length);
    }

/**
     * Encrypts a message.
     *
     * @see \phpseclib\Crypt\Base::decrypt()
     * @see self::_crypt()
     * @access public
     * @param string $plaintext
     * @return string $ciphertext
     */
    function encrypt($plaintext)
    {
        if ($this->engine != Base::ENGINE_INTERNAL) {
            return parent::encrypt($plaintext);
        }
        return $this->_crypt($plaintext, self::ENCRYPT);
    }

/**
     * Decrypts a message.
     *
     * $this->decrypt($this->encrypt($plaintext)) == $this->encrypt($this->encrypt($plaintext)).
     * At least if the continuous buffer is disabled.
     *
     * @see \phpseclib\Crypt\Base::encrypt()
     * @see self::_crypt()
     * @access public
     * @param string $ciphertext
     * @return string $plaintext
     */
    function decrypt($ciphertext)
    {
        if ($this->engine != Base::ENGINE_INTERNAL) {
            return parent::decrypt($ciphertext);
        }
        return $this->_crypt($ciphertext, self::DECRYPT);
    }

/**
     * Encrypts a block
     *
     * @access private
     * @param string $in
     */
    function _encryptBlock($in)
    {
        // RC4 does not utilize this method
    }

/**
     * Decrypts a block
     *
     * @access private
     * @param string $in
     */
    function _decryptBlock($in)
    {
        // RC4 does not utilize this method
    }

/**
     * Setup the key (expansion)
     *
     * @see \phpseclib\Crypt\Base::_setupKey()
     * @access private
     */
    function _setupKey()
    {
        $key = $this->key;
        $keyLength = strlen($key);
        $keyStream = range(0, 255);
        $j = 0;
        for ($i = 0; $i < 256; $i++) {
            $j = ($j + $keyStream[$i] + ord($key[$i % $keyLength])) & 255;
            $temp = $keyStream[$i];
            $keyStream[$i] = $keyStream[$j];
            $keyStream[$j] = $temp;
        }

$this->stream = array();
        $this->stream[self::DECRYPT] = $this->stream[self::ENCRYPT] = array(
            0, // index $i
            0, // index $j
            $keyStream
        );
    }

/**
     * Encrypts or decrypts a message.
     *
     * @see self::encrypt()
     * @see self::decrypt()
     * @access private
     * @param string $text
     * @param int $mode
     * @return string $text
     */
    function _crypt($text, $mode)
    {
        if ($this->changed) {
            $this->_setup();
            $this->changed = false;
        }

$stream = &$this->stream[$mode];
        if ($this->continuousBuffer) {
            $i = &$stream[0];
            $j = &$stream[1];
            $keyStream = &$stream[2];
        } else {
            $i = $stream[0];
            $j = $stream[1];
            $keyStream = $stream[2];
        }

$len = strlen($text);
        for ($k = 0; $k < $len; ++$k) {
            $i = ($i + 1) & 255;
            $ksi = $keyStream[$i];
            $j = ($j + $ksi) & 255;
            $ksj = $keyStream[$j];

$keyStream[$i] = $ksj;
            $keyStream[$j] = $ksi;
            $text[$k] = $text[$k] ^ chr($keyStream[($ksj + $ksi) & 255]);
        }

return $text;
    }
}

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