add methods to decrypt return data from router

[GitHub/Stricted/speedport-hybrid-php-api.git] / CryptLib / Cipher / Block / Cipher / MCrypt.php

diff --git a/CryptLib/Cipher/Block/Cipher/MCrypt.php b/CryptLib/Cipher/Block/Cipher/MCrypt.php
new file mode 100644 (file)
index 0000000..527a28e
--- /dev/null
+++ b/CryptLib/Cipher/Block/Cipher/MCrypt.php
@@ -0,0 +1,152 @@
+<?php
+/**
+ * The mcrypt block cipher implementation
+ *
+ * This class is used above all other implementations since it uses a core PHP
+ * library if it is available.
+ *
+ * PHP version 5.3
+ *
+ * @category   PHPCryptLib
+ * @package    Cipher
+ * @subpackage Block
+ * @author     Anthony Ferrara <ircmaxell@ircmaxell.com>
+ * @copyright  2011 The Authors
+ * @license    http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @version    Build @@version@@
+ */
+
+namespace CryptLib\Cipher\Block\Cipher;
+
+/**
+ * The mcrypt block cipher implementation
+ *
+ * This class is used above all other implementations since it uses a core PHP
+ * library if it is available.
+ *
+ * @category   PHPCryptLib
+ * @package    Cipher
+ * @subpackage Block
+ * @author     Anthony Ferrara <ircmaxell@ircmaxell.com>
+ */
+class MCrypt extends \CryptLib\Cipher\Block\AbstractCipher {
+
+    /**
+     * @var resource The mcrypt resource for cipher operations
+     */
+    protected $mcrypt = null;
+
+    /**
+     * Get a list of supported ciphers for this class implementation
+     *
+     * @return array A list of supported ciphers
+     */
+    public static function getSupportedCiphers() {
+        // @codeCoverageIgnoreStart
+        if (!function_exists('mcrypt_list_algorithms')) {
+            return array();
+        }
+        // @codeCoverageIgnoreEnd
+        return mcrypt_list_algorithms();
+    }
+
+    /**
+     * Construct the instance for the supplied cipher name
+     *
+     * @param string $cipher The cipher to implement
+     *
+     * @return void
+     * @throws InvalidArgumentException if the cipher is not supported
+     */
+    public function __construct($cipher) {
+        parent::__construct($cipher);
+        $this->keySize   = mcrypt_get_key_size($cipher, MCRYPT_MODE_ECB);
+        $this->blockSize = mcrypt_get_block_size($cipher, MCRYPT_MODE_ECB);
+    }
+
+    /**
+     * Destroy the mcrypt module if it's open
+     *
+     * @return void
+     */
+    public function __destruct() {
+        if ($this->mcrypt) {
+            mcrypt_module_close($this->mcrypt);
+        }
+    }
+
+    /**
+     * Set the key to use for the cipher
+     *
+     * @param string $key The key to use
+     *
+     * @throws InvalidArgumentException If the key is not the correct size
+     * @return void
+     */
+    public function setKey($key) {
+        switch ($this->cipher) {
+            case 'rijndael-128':
+            case 'rijndael-192':
+            case 'rijndael-256':
+                if (!in_array(strlen($key), array(16, 20, 24, 28, 32))) {
+                    throw new \InvalidArgumentException(
+                        sprintf(
+                            'The supplied key block is in the valid sizes [%d:%s]',
+                            strlen($key),
+                            '16, 20, 24, 28, 32'
+                        )
+                    );
+                }
+                $this->keySize = strlen($key);
+            default:
+                parent::setKey($key);
+        }
+    }
+
+    /**
+     * Decrypt a block of data using the supplied string key
+     *
+     * Note that the supplied data should be the same size as the block size of
+     * the cipher being used.
+     *
+     * @param string $data The data to decrypt
+     *
+     * @return string The result decrypted data
+     */
+    protected function decryptBlockData($data) {
+        return mdecrypt_generic($this->mcrypt, $data);
+    }
+
+    /**
+     * Encrypt a block of data using the supplied string key
+     *
+     * Note that the supplied data should be the same size as the block size of
+     * the cipher being used.
+     *
+     * @param string $data The data to encrypt
+     *
+     * @return string The result encrypted data
+     */
+    protected function encryptBlockData($data) {
+        return mcrypt_generic($this->mcrypt, $data);
+    }
+
+    /**
+     * Initialize the cipher by preparing the key
+     *
+     * @return boolean The status of the initialization
+     * @codeCoverageIgnore
+     */
+    protected function initialize() {
+        if ($this->mcrypt) {
+            mcrypt_module_close($this->mcrypt);
+        }
+        $this->mcrypt = mcrypt_module_open($this->cipher, '', MCRYPT_MODE_ECB, '');
+        if ($this->mcrypt) {
+            $initv = str_repeat(chr(0), $this->getBlockSize());
+            return false !== mcrypt_generic_init($this->mcrypt, $this->key, $initv);
+        }
+        return false;
+    }
+
+}