From d2df9bc7cc9d4b3e53818470c5d0977c9a36677c Mon Sep 17 00:00:00 2001 From: Derek Allard Date: Sun, 15 Apr 2007 17:41:17 +0000 Subject: update pMachine to EllisLab update copyright year update Code Igniter to CodeIgniter --- system/libraries/Encrypt.php | 792 +++++++++++++++++++++---------------------- 1 file changed, 396 insertions(+), 396 deletions(-) (limited to 'system/libraries/Encrypt.php') diff --git a/system/libraries/Encrypt.php b/system/libraries/Encrypt.php index 0f860a967..758c0f0a5 100644 --- a/system/libraries/Encrypt.php +++ b/system/libraries/Encrypt.php @@ -1,397 +1,397 @@ -_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); - $dec = base64_decode($string); - - if ($dec === FALSE) - { - return FALSE; - } - - if ($this->_mcrypt_exists === TRUE) - { - $dec = $this->mcrypt_decode($dec, $key); - } - - 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 mcrypt_encrypt($this->_get_cipher(), $key, $data, $this->_get_mode(), $init_vect); - } - - // -------------------------------------------------------------------- - - /** - * Decrypt using Mcrypt - * - * @access public - * @param string - * @param string - * @return string - */ - function mcrypt_decode($data, $key) - { - $init_size = mcrypt_get_iv_size($this->_get_cipher(), $this->_get_mode()); - $init_vect = mcrypt_create_iv($init_size, MCRYPT_RAND); - return rtrim(mcrypt_decrypt($this->_get_cipher(), $key, $data, $this->_get_mode(), $init_vect), "\0"); - } - - // -------------------------------------------------------------------- - - /** - * Set the Mcrypt Cipher - * - * @access public - * @param constant - * @return string - */ - function set_cipher($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 +_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); + $dec = base64_decode($string); + + if ($dec === FALSE) + { + return FALSE; + } + + if ($this->_mcrypt_exists === TRUE) + { + $dec = $this->mcrypt_decode($dec, $key); + } + + 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 mcrypt_encrypt($this->_get_cipher(), $key, $data, $this->_get_mode(), $init_vect); + } + + // -------------------------------------------------------------------- + + /** + * Decrypt using Mcrypt + * + * @access public + * @param string + * @param string + * @return string + */ + function mcrypt_decode($data, $key) + { + $init_size = mcrypt_get_iv_size($this->_get_cipher(), $this->_get_mode()); + $init_vect = mcrypt_create_iv($init_size, MCRYPT_RAND); + return rtrim(mcrypt_decrypt($this->_get_cipher(), $key, $data, $this->_get_mode(), $init_vect), "\0"); + } + + // -------------------------------------------------------------------- + + /** + * Set the Mcrypt Cipher + * + * @access public + * @param constant + * @return string + */ + function set_cipher($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 ?> \ No newline at end of file -- cgit v1.2.3-24-g4f1b