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administrator/components/com_akeebabackup/engine/Util/AesAdapter/Mcrypt.php

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+<?php
+/**
+ * Akeeba Engine
+ *
+ * @package   akeebaengine
+ * @copyright Copyright (c)2006-2022 Nicholas K. Dionysopoulos / Akeeba Ltd
+ * @license   GNU General Public License version 3, or later
+ */
+
+namespace Akeeba\Engine\Util\AesAdapter;
+
+defined('AKEEBAENGINE') || die();
+
+use Akeeba\Engine\Util\RandomValue;
+
+class Mcrypt extends AbstractAdapter implements AdapterInterface
+{
+	protected $cipherType = MCRYPT_RIJNDAEL_128;
+
+	protected $cipherMode = MCRYPT_MODE_CBC;
+
+	public function setEncryptionMode($mode = 'cbc', $strength = 128)
+	{
+		switch ((int) $strength)
+		{
+			default:
+			case '128':
+				$this->cipherType = MCRYPT_RIJNDAEL_128;
+				break;
+
+			case '192':
+				$this->cipherType = MCRYPT_RIJNDAEL_192;
+				break;
+
+			case '256':
+				$this->cipherType = MCRYPT_RIJNDAEL_256;
+				break;
+		}
+
+		switch (strtolower($mode))
+		{
+			case 'ecb':
+				$this->cipherMode = MCRYPT_MODE_ECB;
+				break;
+
+			default:
+			case 'cbc':
+				$this->cipherMode = MCRYPT_MODE_CBC;
+				break;
+		}
+
+	}
+
+	public function encrypt($plainText, $key, $iv = null)
+	{
+		$iv_size = $this->getBlockSize();
+		$key     = $this->resizeKey($key, $iv_size);
+		$iv      = $this->resizeKey($iv, $iv_size);
+
+		if (empty($iv))
+		{
+			$randVal = new RandomValue();
+			$iv      = $randVal->generate($iv_size);
+		}
+
+		$cipherText = mcrypt_encrypt($this->cipherType, $key, $plainText, $this->cipherMode, $iv);
+		$cipherText = $iv . $cipherText;
+
+		return $cipherText;
+	}
+
+	public function decrypt($cipherText, $key)
+	{
+		$iv_size    = $this->getBlockSize();
+		$key        = $this->resizeKey($key, $iv_size);
+		$iv         = substr($cipherText, 0, $iv_size);
+		$cipherText = substr($cipherText, $iv_size);
+		$plainText  = mcrypt_decrypt($this->cipherType, $key, $cipherText, $this->cipherMode, $iv);
+
+		return $plainText;
+	}
+
+	public function isSupported()
+	{
+		if (!function_exists('mcrypt_get_key_size'))
+		{
+			return false;
+		}
+
+		if (!function_exists('mcrypt_get_iv_size'))
+		{
+			return false;
+		}
+
+		if (!function_exists('mcrypt_create_iv'))
+		{
+			return false;
+		}
+
+		if (!function_exists('mcrypt_encrypt'))
+		{
+			return false;
+		}
+
+		if (!function_exists('mcrypt_decrypt'))
+		{
+			return false;
+		}
+
+		if (!function_exists('mcrypt_list_algorithms'))
+		{
+			return false;
+		}
+
+		if (!function_exists('hash'))
+		{
+			return false;
+		}
+
+		if (!function_exists('hash_algos'))
+		{
+			return false;
+		}
+
+		$algorightms = mcrypt_list_algorithms();
+
+		if (!in_array('rijndael-128', $algorightms))
+		{
+			return false;
+		}
+
+		if (!in_array('rijndael-192', $algorightms))
+		{
+			return false;
+		}
+
+		if (!in_array('rijndael-256', $algorightms))
+		{
+			return false;
+		}
+
+		$algorightms = hash_algos();
+
+		if (!in_array('sha256', $algorightms))
+		{
+			return false;
+		}
+
+		return true;
+	}
+
+	public function getBlockSize()
+	{
+		return mcrypt_get_iv_size($this->cipherType, $this->cipherMode);
+	}
+}