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use a dedicated exception class for throwing exceptions on decrypt failure

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This commit is contained in:
Dylan K. Taylor
2020-04-22 09:40:26 +01:00
parent 5a33dbd4c6
commit dd37d286f0
3 changed files with 33 additions and 4 deletions
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28
src/network/mcpe/encryption/DecryptionException.php Normal file
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@ -0,0 +1,28 @@
<?php
/*
*
* ____ _ _ __ __ _ __ __ ____
* | _ \ ___ ___| | _____| |_| \/ (_)_ __ ___ | \/ | _ \
* | |_) / _ \ / __| |/ / _ \ __| |\/| | | '_ \ / _ \_____| |\/| | |_) |
* | __/ (_) | (__| < __/ |_| | | | | | | | __/_____| | | | __/
* |_| \___/ \___|_|\_\___|\__|_| |_|_|_| |_|\___| |_| |_|_|
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* @author PocketMine Team
* @link http://www.pocketmine.net/
*
*
*/
declare(strict_types=1);
namespace pocketmine\network\mcpe\encryption;
final class DecryptionException extends \RuntimeException{
}

6
src/network/mcpe/encryption/NetworkCipher.php
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@ -65,17 +65,17 @@ class NetworkCipher{
}
/**
* @throws \UnexpectedValueException
* @throws DecryptionException
*/
public function decrypt(string $encrypted) : string{
if(strlen($encrypted) < 9){
throw new \UnexpectedValueException("Payload is too short");
throw new DecryptionException("Payload is too short");
}
$decrypted = $this->decryptCipher->decryptUpdate($encrypted);
$payload = substr($decrypted, 0, -8);
if(($expected = $this->calculateChecksum($this->decryptCounter++, $payload)) !== ($actual = substr($decrypted, -8))){
throw new \UnexpectedValueException("Encrypted payload has invalid checksum (expected " . bin2hex($expected) . ", got " . bin2hex($actual) . ")");
throw new DecryptionException("Encrypted payload has invalid checksum (expected " . bin2hex($expected) . ", got " . bin2hex($actual) . ")");
}
return $payload;