113 lines
2.8 KiB
PHP
113 lines
2.8 KiB
PHP
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<?php
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// by https://github.com/mgp25
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class TelegramEncryption
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{
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public $key;
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public $iv;
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public $cipherText;
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public $plainText;
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public $debug;
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public function __construct($key, $iv, $cipherText = null, $plainText = null, $debug = false)
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{
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$this->key = $key;
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$this->iv = $iv;
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$this->cipherText = $cipherText;
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$this->plainText = $plainText;
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$this->debug = $debug;
}
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public function IGE256Decrypt()
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{
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$key = $this->key;
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$message = $this->cipherText;
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$blockSize = mcrypt_get_block_size(MCRYPT_RIJNDAEL_128, MCRYPT_MODE_ECB);
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$xPrev = substr($this->iv, 0, $blockSize);
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$yPrev = substr($this->iv, $blockSize, strlen($this->iv));
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$decrypted = '';
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for ($i=0; $i < strlen($message); $i += $blockSize)
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{
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$x = substr($message, $i, $blockSize);
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$this->debugLog("x: " . _c($x) . "\n");
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$yXOR = $this->exor($x, $yPrev);
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$this->debugLog("yPrev: " . _c($yPrev) . "\n");
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$this->debugLog("yXOR: " . _c($yXOR) . "\n");
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$yFinal = mcrypt_decrypt(MCRYPT_RIJNDAEL_128, $key, $yXOR, MCRYPT_MODE_ECB); $yFinal = str_pad($yFinal, strlen($xPrev), "\x00");
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$this->debugLog("yFinal: " . _c($yFinal) . “\n");
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$y = $this->exor($yFinal, $xPrev);
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$this->debugLog("xPrev: " . _c($xPrev) . "\n");
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$this->debugLog("y: " . _c($y) . "\n");
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$xPrev = $x;
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$yPrev = $y;
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$decrypted .= $y;
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$this->debugLog("Currently Decrypted: "._c($decrypted)."\n\n");
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}
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return $decrypted;
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}
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public function IGE256Encrypt()
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{
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$key = $this->key;
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$message = $this->plainText;
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$blockSize = mcrypt_get_block_size(MCRYPT_RIJNDAEL_128, MCRYPT_MODE_ECB);
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$xPrev = substr($this->iv, $blockSize, strlen($this->iv));
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$yPrev = substr($this->iv, 0, $blockSize);
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$encrypted = '';
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for ($i=0; $i < strlen($message); $i += $blockSize)
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{
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$x = substr($message, $i, $blockSize);
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$this->debugLog("x: " . _c($x) . “\n");
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$yXOR = $this->exor($x, $yPrev);
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$this->debugLog("yPrev: " . _c($yPrev) . "\n");
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$this->debugLog("yXOR: " . _c($yXOR) . "\n");
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$yFinal = mcrypt_encrypt(MCRYPT_RIJNDAEL_128, $key, $yXOR, MCRYPT_MODE_ECB); $yFinal = str_pad($yFinal, strlen($xPrev), "\x00");
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$this->debugLog("yFinal: " . _c($yFinal) . “\n");
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$y = $this->exor($yFinal, $xPrev);
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$this->debugLog("xPrev: " . _c($xPrev) . “\n");
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$this->debugLog("y: " . _c($y) . “\n");
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$xPrev = $x;
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$yPrev = $y;
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$encrypted .= $y;
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$this->debugLog("Currently encrypted: "._c($encrypted)."\n\n");
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}
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return $encrypted;
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}
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public function debugLog($message)
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{
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if ($this->debug)
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echo $message;
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}
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public function exor($array1, $array2)
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{
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$len = (strlen($array1) <= strlen($array2)) ? strlen($array2) : strlen($array1);
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$array1 = str_pad($array1, $len, “\x00");
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$array2 = str_pad($array2, $len, “\x00");
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$res = ‘';
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for ($i=0; $i < $len; $i++)
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{
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$res .= $array1[$i] ^ $array2[$i];
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}
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return $res;
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}
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function _c($binary) { return sprintf(“[%s]", chunk_split(bin2hex($binary), 4, ' ')); }
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}
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