--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dcrypt/crypto/SymmetricCipher.d	Sun Aug 10 14:20:17 2008 -0400
@@ -0,0 +1,32 @@
+/**
+ * This file is part of the dcrypt project.
+ *
+ * Copyright: Copyright (C) dcrypt contributors 2008. All rights reserved.
+ * License:   MIT
+ * Authors:   Thomas Dixon
+ */
+
+module dcrypt.crypto.SymmetricCipher;
+
+import dcrypt.crypto.Cipher;
+import dcrypt.crypto.params.CipherParameters;
+
+/** Unified cipher class for high-level API. */
+interface SymmetricCipher : Cipher {
+    /** 
+     * Pass bytes through the cipher object.
+     * 
+     * Params:
+     *     input_  = Array containing input data.
+     *     inOff   = Offset at where the data in input_ starts.
+     *     len     = Length of input_ to process.
+     *     output_ = Array which will hold the output data.
+     *     outOff  = Offset at which to begin placing data in output_.
+     *
+     * Returns: The amount of bytes processed.
+     */
+    uint update(void[] input_, uint inOff, uint len, void[] output_, uint outOff);
+    
+    /** Finalize and output the rest of the buffer. */
+    uint finish(void[] output_, uint outOff);
+}