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diff --git a/CryptLib/Cipher/Block/Cipher.php b/CryptLib/Cipher/Block/Cipher.php
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+<?php
+/**
+ * The interface that all block ciphers must implement
+ *
+ * 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;
+
+/**
+ * The interface that all block ciphers must implement
+ *
+ * @category   PHPCryptLib
+ * @package    Cipher
+ * @subpackage Block
+ * @author     Anthony Ferrara <ircmaxell@ircmaxell.com>
+ * @codeCoverageIgnore
+ */
+interface Cipher {
+
+    /**
+     * Get a list of supported ciphers by this cipher.
+     *
+     * @return array An array of supported cipher names (strings)
+     */
+    public static function getSupportedCiphers();
+
+    /**
+     * 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 $data The data to decrypt
+     *
+     * @return string The result decrypted data
+     */
+    public function decryptBlock($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 $data The data to encrypt
+     *
+     * @return string The result encrypted data
+     */
+    public function encryptBlock($data);
+
+    /**
+     * Get the block size for the current initialized cipher.
+     *
+     * @return int The block size for the current cipher
+     */
+    public function getBlockSize();
+
+    /**
+     * Get the key size for the current initialized cipher
+     * 
+     * @return int The key size for the current cipher
+     */
+    public function getKeySize();
+
+    /**
+     * Get the string name of the current cipher instance.
+     *
+     * @return string The current instantiated cipher
+     */
+    public function getCipher();
+
+    /**
+     * Set the key to be used in this instance
+     * 
+     * @param string $key The key the data will be encrypted with
+     * 
+     * @return void
+     */
+    public function setKey($key);
+
+}