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Merge pull request #2 from danog/analysis-8Q3kjm
Applied fixes from StyleCI
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<?php | ||
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// by https://github.com/mgp25 | ||
class TelegramEncryption | ||
{ | ||
public $key; | ||
public $iv; | ||
public $cipherText; | ||
public $plainText; | ||
public $debug; | ||
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public function __construct($key, $iv, $cipherText = null, $plainText = null, $debug = false) | ||
{ | ||
$this->key = $key; | ||
$this->iv = $iv; | ||
$this->cipherText = $cipherText; | ||
$this->plainText = $plainText; | ||
$this->debug = $debug; | ||
} | ||
public function IGE256Decrypt() | ||
{ | ||
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$key = $this->key; | ||
$message = $this->cipherText; | ||
$blockSize = mcrypt_get_block_size(MCRYPT_RIJNDAEL_128, MCRYPT_MODE_ECB); | ||
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$xPrev = substr($this->iv, 0, $blockSize); | ||
$yPrev = substr($this->iv, $blockSize, strlen($this->iv)); | ||
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$decrypted = ''; | ||
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for ($i=0; $i < strlen($message); $i += $blockSize) | ||
{ | ||
$x = substr($message, $i, $blockSize); | ||
$this->debugLog("x: " . _c($x) . "\n"); | ||
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$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"); | ||
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$y = $this->exor($yFinal, $xPrev); | ||
$this->debugLog("xPrev: " . _c($xPrev) . "\n"); | ||
$this->debugLog("y: " . _c($y) . "\n"); | ||
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$xPrev = $x; | ||
$yPrev = $y; | ||
$decrypted .= $y; | ||
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$this->debugLog("Currently Decrypted: "._c($decrypted)."\n\n"); | ||
} | ||
return $decrypted; | ||
} | ||
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public function IGE256Encrypt() | ||
{ | ||
$key = $this->key; | ||
$message = $this->plainText; | ||
$blockSize = mcrypt_get_block_size(MCRYPT_RIJNDAEL_128, MCRYPT_MODE_ECB); | ||
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$xPrev = substr($this->iv, $blockSize, strlen($this->iv)); | ||
$yPrev = substr($this->iv, 0, $blockSize); | ||
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$encrypted = ''; | ||
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for ($i=0; $i < strlen($message); $i += $blockSize) | ||
{ | ||
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$x = substr($message, $i, $blockSize); | ||
$this->debugLog("x: " . _c($x) . "\n"); | ||
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$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"); | ||
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$xPrev = $x; | ||
$yPrev = $y; | ||
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$encrypted .= $y; | ||
$this->debugLog("Currently encrypted: "._c($encrypted)."\n\n"); | ||
} | ||
return $encrypted; | ||
} | ||
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public function debugLog($message) | ||
{ | ||
if ($this->debug) | ||
echo $message; | ||
} | ||
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public function exor($array1, $array2) | ||
{ | ||
$len = (strlen($array1) <= strlen($array2)) ? strlen($array2) : strlen($array1); | ||
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$array1 = str_pad($array1, $len, "\x00"); | ||
$array2 = str_pad($array2, $len, "\x00"); | ||
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$res = ''; | ||
for ($i=0; $i < $len; $i++) | ||
{ | ||
$res .= $array1[$i] ^ $array2[$i]; | ||
} | ||
return $res; | ||
} | ||
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function _c($binary) { | ||
return sprintf("[%s]", chunk_split(bin2hex($binary), 4," ") | ||
public $key; | ||
public $iv; | ||
public $cipherText; | ||
public $plainText; | ||
public $debug; | ||
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public function __construct($key, $iv, $cipherText = null, $plainText = null, $debug = false) | ||
{ | ||
$this->key = $key; | ||
$this->iv = $iv; | ||
$this->cipherText = $cipherText; | ||
$this->plainText = $plainText; | ||
$this->debug = $debug; | ||
} | ||
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public function IGE256Decrypt() | ||
{ | ||
$key = $this->key; | ||
$message = $this->cipherText; | ||
$blockSize = mcrypt_get_block_size(MCRYPT_RIJNDAEL_128, MCRYPT_MODE_ECB); | ||
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$xPrev = substr($this->iv, 0, $blockSize); | ||
$yPrev = substr($this->iv, $blockSize, strlen($this->iv)); | ||
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$decrypted = ''; | ||
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for ($i = 0; $i < strlen($message); $i += $blockSize) { | ||
$x = substr($message, $i, $blockSize); | ||
$this->debugLog('x: '._c($x)."\n"); | ||
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$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"); | ||
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$y = $this->exor($yFinal, $xPrev); | ||
$this->debugLog('xPrev: '._c($xPrev)."\n"); | ||
$this->debugLog('y: '._c($y)."\n"); | ||
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$xPrev = $x; | ||
$yPrev = $y; | ||
$decrypted .= $y; | ||
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$this->debugLog('Currently Decrypted: '._c($decrypted)."\n\n"); | ||
} | ||
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return $decrypted; | ||
} | ||
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public function IGE256Encrypt() | ||
{ | ||
$key = $this->key; | ||
$message = $this->plainText; | ||
$blockSize = mcrypt_get_block_size(MCRYPT_RIJNDAEL_128, MCRYPT_MODE_ECB); | ||
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$xPrev = substr($this->iv, $blockSize, strlen($this->iv)); | ||
$yPrev = substr($this->iv, 0, $blockSize); | ||
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$encrypted = ''; | ||
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for ($i = 0; $i < strlen($message); $i += $blockSize) { | ||
$x = substr($message, $i, $blockSize); | ||
$this->debugLog('x: '._c($x)."\n"); | ||
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$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"); | ||
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$xPrev = $x; | ||
$yPrev = $y; | ||
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$encrypted .= $y; | ||
$this->debugLog('Currently encrypted: '._c($encrypted)."\n\n"); | ||
} | ||
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return $encrypted; | ||
} | ||
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public function debugLog($message) | ||
{ | ||
if ($this->debug) { | ||
echo $message; | ||
} | ||
} | ||
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public function exor($array1, $array2) | ||
{ | ||
$len = (strlen($array1) <= strlen($array2)) ? strlen($array2) : strlen($array1); | ||
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$array1 = str_pad($array1, $len, "\x00"); | ||
$array2 = str_pad($array2, $len, "\x00"); | ||
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$res = ''; | ||
for ($i = 0; $i < $len; $i++) { | ||
$res .= $array1[$i] ^ $array2[$i]; | ||
} | ||
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return $res; | ||
} | ||
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public function _c($binary) | ||
{ | ||
return sprintf('[%s]', chunk_split(bin2hex($binary), 4, ' ') | ||
); | ||
} | ||
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} | ||
} |