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Merge pull request #2 from danog/analysis-8Q3kjm

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Applied fixes from StyleCI
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Daniil Gentili 2016-07-15 13:11:22 +02:00 committed by GitHub
commit 0cfc2c50ea
1 changed files with 91 additions and 90 deletions
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181
aes256.php
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@ -1,118 +1,119 @@
<?php <?php
// by https://github.com/mgp25 // by https://github.com/mgp25
class TelegramEncryption class TelegramEncryption
{ {
public $key; public $key;
public $iv; public $iv;
public $cipherText; public $cipherText;
public $plainText; public $plainText;
public $debug; public $debug;
public function __construct($key, $iv, $cipherText = null, $plainText = null, $debug = false) public function __construct($key, $iv, $cipherText = null, $plainText = null, $debug = false)
{ {
$this->key = $key; $this->key = $key;
$this->iv = $iv; $this->iv = $iv;
$this->cipherText = $cipherText; $this->cipherText = $cipherText;
$this->plainText = $plainText; $this->plainText = $plainText;
$this->debug = $debug; $this->debug = $debug;
} }
public function IGE256Decrypt()
{
$key = $this->key; public function IGE256Decrypt()
$message = $this->cipherText; {
$blockSize = mcrypt_get_block_size(MCRYPT_RIJNDAEL_128, MCRYPT_MODE_ECB); $key = $this->key;
$message = $this->cipherText;
$blockSize = mcrypt_get_block_size(MCRYPT_RIJNDAEL_128, MCRYPT_MODE_ECB);
$xPrev = substr($this->iv, 0, $blockSize); $xPrev = substr($this->iv, 0, $blockSize);
$yPrev = substr($this->iv, $blockSize, strlen($this->iv)); $yPrev = substr($this->iv, $blockSize, strlen($this->iv));
$decrypted = ''; $decrypted = '';
for ($i=0; $i < strlen($message); $i += $blockSize) for ($i = 0; $i < strlen($message); $i += $blockSize) {
{ $x = substr($message, $i, $blockSize);
$x = substr($message, $i, $blockSize); $this->debugLog('x: '._c($x)."\n");
$this->debugLog("x: " . _c($x) . "\n");
$yXOR = $this->exor($x, $yPrev); $yXOR = $this->exor($x, $yPrev);
$this->debugLog("yPrev: " . _c($yPrev) . "\n"); $this->debugLog('yPrev: '._c($yPrev)."\n");
$this->debugLog("yXOR: " . _c($yXOR) . "\n"); $this->debugLog('yXOR: '._c($yXOR)."\n");
$yFinal = mcrypt_decrypt(MCRYPT_RIJNDAEL_128, $key, $yXOR, MCRYPT_MODE_ECB); $yFinal = mcrypt_decrypt(MCRYPT_RIJNDAEL_128, $key, $yXOR, MCRYPT_MODE_ECB);
$yFinal = str_pad($yFinal, strlen($xPrev), "\x00"); $yFinal = str_pad($yFinal, strlen($xPrev), "\x00");
$this->debugLog("yFinal: " . _c($yFinal) . "\n"); $this->debugLog('yFinal: '._c($yFinal)."\n");
$y = $this->exor($yFinal, $xPrev); $y = $this->exor($yFinal, $xPrev);
$this->debugLog("xPrev: " . _c($xPrev) . "\n"); $this->debugLog('xPrev: '._c($xPrev)."\n");
$this->debugLog("y: " . _c($y) . "\n"); $this->debugLog('y: '._c($y)."\n");
$xPrev = $x; $xPrev = $x;
$yPrev = $y; $yPrev = $y;
$decrypted .= $y; $decrypted .= $y;
$this->debugLog("Currently Decrypted: "._c($decrypted)."\n\n"); $this->debugLog('Currently Decrypted: '._c($decrypted)."\n\n");
} }
return $decrypted;
}
public function IGE256Encrypt() return $decrypted;
{ }
$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)); public function IGE256Encrypt()
$yPrev = substr($this->iv, 0, $blockSize); {
$key = $this->key;
$message = $this->plainText;
$blockSize = mcrypt_get_block_size(MCRYPT_RIJNDAEL_128, MCRYPT_MODE_ECB);
$encrypted = ''; $xPrev = substr($this->iv, $blockSize, strlen($this->iv));
$yPrev = substr($this->iv, 0, $blockSize);
for ($i=0; $i < strlen($message); $i += $blockSize) $encrypted = '';
{
$x = substr($message, $i, $blockSize); for ($i = 0; $i < strlen($message); $i += $blockSize) {
$this->debugLog("x: " . _c($x) . "\n"); $x = substr($message, $i, $blockSize);
$this->debugLog('x: '._c($x)."\n");
$yXOR = $this->exor($x, $yPrev); $yXOR = $this->exor($x, $yPrev);
$this->debugLog("yPrev: " . _c($yPrev) . "\n"); $this->debugLog('yPrev: '._c($yPrev)."\n");
$this->debugLog("yXOR: " . _c($yXOR) . "\n"); $this->debugLog('yXOR: '._c($yXOR)."\n");
$yFinal = mcrypt_encrypt(MCRYPT_RIJNDAEL_128, $key, $yXOR, MCRYPT_MODE_ECB); $yFinal = mcrypt_encrypt(MCRYPT_RIJNDAEL_128, $key, $yXOR, MCRYPT_MODE_ECB);
$yFinal = str_pad($yFinal, strlen($xPrev), "\x00"); $yFinal = str_pad($yFinal, strlen($xPrev), "\x00");
$this->debugLog("yFinal: " . _c($yFinal) . "\n"); $this->debugLog('yFinal: '._c($yFinal)."\n");
$y = $this->exor($yFinal, $xPrev); $y = $this->exor($yFinal, $xPrev);
$this->debugLog("xPrev: " . _c($xPrev) . "\n"); $this->debugLog('xPrev: '._c($xPrev)."\n");
$this->debugLog("y: " . _c($y) . "\n"); $this->debugLog('y: '._c($y)."\n");
$xPrev = $x; $xPrev = $x;
$yPrev = $y; $yPrev = $y;
$encrypted .= $y; $encrypted .= $y;
$this->debugLog("Currently encrypted: "._c($encrypted)."\n\n"); $this->debugLog('Currently encrypted: '._c($encrypted)."\n\n");
} }
return $encrypted;
}
public function debugLog($message) return $encrypted;
{ }
if ($this->debug)
echo $message;
}
public function exor($array1, $array2) public function debugLog($message)
{ {
$len = (strlen($array1) <= strlen($array2)) ? strlen($array2) : strlen($array1); if ($this->debug) {
echo $message;
}
}
$array1 = str_pad($array1, $len, "\x00"); public function exor($array1, $array2)
$array2 = str_pad($array2, $len, "\x00"); {
$len = (strlen($array1) <= strlen($array2)) ? strlen($array2) : strlen($array1);
$res = ''; $array1 = str_pad($array1, $len, "\x00");
for ($i=0; $i < $len; $i++) $array2 = str_pad($array2, $len, "\x00");
{
$res .= $array1[$i] ^ $array2[$i];
}
return $res;
}
function _c($binary) { $res = '';
return sprintf("[%s]", chunk_split(bin2hex($binary), 4," ") for ($i = 0; $i < $len; $i++) {
$res .= $array1[$i] ^ $array2[$i];
}
return $res;
}
public function _c($binary)
{
return sprintf('[%s]', chunk_split(bin2hex($binary), 4, ' ')
); );
} }
} }