76 lines
3.1 KiB
PHP
76 lines
3.1 KiB
PHP
<?php
|
|
/*
|
|
Copyright 2016 Daniil Gentili
|
|
(https://daniil.it)
|
|
This file is part of MadelineProto.
|
|
MadelineProto is free software: you can redistribute it and/or modify it under the terms of the GNU Affero General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
|
|
The PWRTelegram API is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
|
|
See the GNU Affero General Public License for more details.
|
|
You should have received a copy of the GNU General Public License along with the MadelineProto.
|
|
If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
namespace danog\MadelineProto;
|
|
class Crypt
|
|
{
|
|
public function ige_encrypt($message, $key, $iv)
|
|
{
|
|
return _ige($message, $key, $iv, 'encrypt');
|
|
}
|
|
|
|
public function ige_decrypt($message, $key, $iv)
|
|
{
|
|
return _ige($message, $key, $iv, 'decrypt');
|
|
}
|
|
|
|
/**
|
|
* Given a key, given an iv, and message
|
|
* do whatever operation asked in the operation field.
|
|
* Operation will be checked for: "decrypt" and "encrypt" strings.
|
|
* Returns the message encrypted/decrypted.
|
|
* message must be a multiple by 16 bytes (for division in 16 byte blocks)
|
|
* key must be 32 byte
|
|
* iv must be 32 byte (it's not internally used in AES 256 ECB, but it's
|
|
* needed for IGE).
|
|
*/
|
|
public function _ige($message, $key, $iv, $operation = 'decrypt')
|
|
{
|
|
$message = str_split($message);
|
|
if ((len($key) != 32)) {
|
|
throw new Exception('key must be 32 bytes long (was '.len($key).' bytes)');
|
|
}
|
|
if ((len($iv) != 32)) {
|
|
throw new Exception('iv must be 32 bytes long (was '.len($iv).' bytes)');
|
|
}
|
|
$cipher = new AES($key);
|
|
$cipher = $cipher->encrypt($iv);
|
|
$blocksize = $cipher->block_size;
|
|
if ((len($message) % $blocksize) != 0) {
|
|
throw new Exception('message must be a multiple of 16 bytes (try adding '.(16 - (count($message) % 16)).' bytes of padding)');
|
|
}
|
|
$ivp = substr($iv, 0, $blocksize - 0);
|
|
$ivp2 = substr($iv, $blocksize, null);
|
|
$ciphered = null;
|
|
foreach (pyjslib_range(0, len($message), $blocksize) as $i) {
|
|
$indata = substr($message, $i, ($i + $blocksize) - $i);
|
|
if (($operation == 'decrypt')) {
|
|
$xored = strxor($indata, $ivp2);
|
|
$decrypt_xored = $cipher->decrypt($xored);
|
|
$outdata = strxor($decrypt_xored, $ivp);
|
|
$ivp = $indata;
|
|
$ivp2 = $outdata;
|
|
} elseif (($operation == 'encrypt')) {
|
|
$xored = strxor($indata, $ivp);
|
|
$encrypt_xored = $cipher->encrypt($xored);
|
|
$outdata = strxor($encrypt_xored, $ivp2);
|
|
$ivp = $outdata;
|
|
$ivp2 = $indata;
|
|
} else {
|
|
throw new Exception('operation must be either \'decrypt\' or \'encrypt\'');
|
|
}
|
|
$ciphered .= $outdata;
|
|
}
|
|
|
|
return $ciphered;
|
|
}
|
|
}
|