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AES256
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| <?php | |
| class TelegramEncryption | |
| { | |
| public $key; | |
| public $iv; | |
| public $cipherText; | |
| public $plainText; | |
| public $debug; | |
| public function __construct($key, $iv, $cipherText = null, $plainText = null, $debug = false) | |
| { | |
| $this->key = $key; | |
| $this->iv = $iv; | |
| $this->cipherText = $cipherText; | |
| $this->plainText = $plainText; | |
| $this->debug = $debug; } | |
| public function IGE256Decrypt() | |
| { | |
| $key = $this->key; | |
| $message = $this->cipherText; | |
| $blockSize = mcrypt_get_block_size(MCRYPT_RIJNDAEL_128, MCRYPT_MODE_ECB); | |
| $xPrev = substr($this->iv, 0, $blockSize); | |
| $yPrev = substr($this->iv, $blockSize, strlen($this->iv)); | |
| $decrypted = ''; | |
| for ($i=0; $i < strlen($message); $i += $blockSize) | |
| { | |
| $x = substr($message, $i, $blockSize); | |
| $this->debugLog("x: " . _c($x) . "\n"); | |
| $yXOR = $this->exor($x, $yPrev); | |
| $this->debugLog("yPrev: " . _c($yPrev) . "\n"); | |
| $this->debugLog("yXOR: " . _c($yXOR) . "\n"); | |
| $yFinal = mcrypt_decrypt(MCRYPT_RIJNDAEL_128, $key, $yXOR, MCRYPT_MODE_ECB); $yFinal = str_pad($yFinal, strlen($xPrev), "\x00"); | |
| $this->debugLog("yFinal: " . _c($yFinal) . “\n"); | |
| $y = $this->exor($yFinal, $xPrev); | |
| $this->debugLog("xPrev: " . _c($xPrev) . "\n"); | |
| $this->debugLog("y: " . _c($y) . "\n"); | |
| $xPrev = $x; | |
| $yPrev = $y; | |
| $decrypted .= $y; | |
| $this->debugLog("Currently Decrypted: "._c($decrypted)."\n\n"); | |
| } | |
| return $decrypted; | |
| } | |
| public function IGE256Encrypt() | |
| { | |
| $key = $this->key; | |
| $message = $this->plainText; | |
| $blockSize = mcrypt_get_block_size(MCRYPT_RIJNDAEL_128, MCRYPT_MODE_ECB); | |
| $xPrev = substr($this->iv, $blockSize, strlen($this->iv)); | |
| $yPrev = substr($this->iv, 0, $blockSize); | |
| $encrypted = ''; | |
| for ($i=0; $i < strlen($message); $i += $blockSize) | |
| { | |
| $x = substr($message, $i, $blockSize); | |
| $this->debugLog("x: " . _c($x) . “\n"); | |
| $yXOR = $this->exor($x, $yPrev); | |
| $this->debugLog("yPrev: " . _c($yPrev) . "\n"); | |
| $this->debugLog("yXOR: " . _c($yXOR) . "\n"); | |
| $yFinal = mcrypt_encrypt(MCRYPT_RIJNDAEL_128, $key, $yXOR, MCRYPT_MODE_ECB); $yFinal = str_pad($yFinal, strlen($xPrev), "\x00"); | |
| $this->debugLog("yFinal: " . _c($yFinal) . “\n"); | |
| $y = $this->exor($yFinal, $xPrev); | |
| $this->debugLog("xPrev: " . _c($xPrev) . “\n"); | |
| $this->debugLog("y: " . _c($y) . “\n"); | |
| $xPrev = $x; | |
| $yPrev = $y; | |
| $encrypted .= $y; | |
| $this->debugLog("Currently encrypted: "._c($encrypted)."\n\n"); | |
| } | |
| return $encrypted; | |
| } | |
| public function debugLog($message) | |
| { | |
| if ($this->debug) | |
| echo $message; | |
| } | |
| public function exor($array1, $array2) | |
| { | |
| $len = (strlen($array1) <= strlen($array2)) ? strlen($array2) : strlen($array1); | |
| $array1 = str_pad($array1, $len, “\x00"); | |
| $array2 = str_pad($array2, $len, “\x00"); | |
| $res = ‘'; | |
| for ($i=0; $i < $len; $i++) | |
| { | |
| $res .= $array1[$i] ^ $array2[$i]; | |
| } | |
| return $res; | |
| } | |
| function _c($binary) { return sprintf(“[%s]", chunk_split(bin2hex($binary), 4, ' ')); } | |
| } |
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