add methods to decrypt return data from router

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

diff --git a/CryptLib/Cipher/Block/Cipher/TripleDES.php b/CryptLib/Cipher/Block/Cipher/TripleDES.php
new file mode 100644 (file)
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+++ b/CryptLib/Cipher/Block/Cipher/TripleDES.php
@@ -0,0 +1,116 @@
+<?php
+/**
+ * An implementation of the TripleDES cipher
+ * 
+ * This was forked from phpseclib and modified to use CryptLib conventions
+ *
+ * PHP version 5.3
+ *
+ * @category   PHPCryptLib
+ * @package    Cipher
+ * @subpackage Block
+ * @author     Anthony Ferrara <ircmaxell@ircmaxell.com>
+ * @author     Jim Wigginton <terrafrost@php.net>
+ * @copyright  2011 The Authors
+ * @license    http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @version    Build @@version@@
+ */
+
+namespace CryptLib\Cipher\Block\Cipher;
+
+/**
+ * An implementation of the TripleDES Cipher
+ *
+ * @category   PHPCryptLib
+ * @package    Cipher
+ * @subpackage Block
+ * @author     Anthony Ferrara <ircmaxell@ircmaxell.com>
+ */
+class TripleDES extends DES {
+
+    /**
+     * @var int The key size for the cipher
+     */
+    protected $keySize = 24;
+
+    /**
+     * Get a list of supported ciphers for this class implementation
+     *
+     * @return array A list of supported ciphers
+     */
+    public static function getSupportedCiphers() {
+        return array('tripledes');
+    }
+
+    /**
+     * 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) {
+        $len = strlen($key);
+        if ($len == 16) {
+            $key .= substr($key, 0, 8);
+        } elseif ($len != 24) {
+            throw new \InvalidArgumentException(
+                'The supplied key block is not the correct size'
+            );
+        }
+        $this->key         = $key;
+        $this->initialized = true;
+    }
+
+    /**
+     * 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) {
+        $key       = $this->key;
+        $this->key = substr($key, 16, 8);
+        $this->initialize();
+        $data      = parent::decryptBlockData($data);
+        $this->key = substr($key, 8, 8);
+        $this->initialize();
+        $data      = parent::encryptBlockData($data);
+        $this->key = substr($key, 0, 8);
+        $this->initialize();
+        $data      = parent::decryptBlockData($data);
+        $this->key = $key;
+        return $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) {
+        $key       = $this->key;
+        $this->key = substr($key, 0, 8);
+        $this->initialize();
+        $data      = parent::encryptBlockData($data);
+        $this->key = substr($key, 8, 8);
+        $this->initialize();
+        $data      = parent::decryptBlockData($data);
+        $this->key = substr($key, 16, 8);
+        $this->initialize();
+        $data      = parent::encryptBlockData($data);
+        $this->key = $key;
+        return $data;
+    }
+
+}