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diff --git a/linden/indra/llmessage/llcipher.h b/linden/indra/llmessage/llcipher.h
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+/** 
+ * @file llcipher.h
+ * @brief Abstract base class for encryption ciphers.
+ *
+ * Copyright (c) 2003-2007, Linden Research, Inc.
+ * 
+ * The source code in this file ("Source Code") is provided by Linden Lab
+ * to you under the terms of the GNU General Public License, version 2.0
+ * ("GPL"), unless you have obtained a separate licensing agreement
+ * ("Other License"), formally executed by you and Linden Lab.  Terms of
+ * the GPL can be found in doc/GPL-license.txt in this distribution, or
+ * online at http://secondlife.com/developers/opensource/gplv2
+ * 
+ * There are special exceptions to the terms and conditions of the GPL as
+ * it is applied to this Source Code. View the full text of the exception
+ * in the file doc/FLOSS-exception.txt in this software distribution, or
+ * online at http://secondlife.com/developers/opensource/flossexception
+ * 
+ * By copying, modifying or distributing this software, you acknowledge
+ * that you have read and understood your obligations described above,
+ * and agree to abide by those obligations.
+ * 
+ * ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
+ * WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
+ * COMPLETENESS OR PERFORMANCE.
+ */
+
+#ifndef LLCIPHER_H
+#define LLCIPHER_H
+
+//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+// Class LLCipher
+//
+// Abstract base class for a cipher object.
+//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+class LLCipher
+{
+public:
+        virtual ~LLCipher() {}
+
+        // encrypt src and place result into dst. returns TRUE if
+        // Returns number of bytes written into dst, or 0 on error.
+        virtual U32 encrypt(const U8* src, U32 src_len, U8* dst, U32 dst_len) = 0;
+
+        // decrypt src and place result into dst. 
+        // Returns number of bytes written into dst, or 0 on error.
+        virtual U32 decrypt(const U8* src, U32 src_len, U8* dst, U32 dst_len) = 0;
+
+        // returns the minimum amount of space required to encrypt for a 
+        // unencrypted source buffer of length len.
+        // *NOTE: This is estimated space and you should check the return value
+        // of the encrypt function.
+        virtual U32 requiredEncryptionSpace(U32 src_len) const = 0 ;
+};
+
+#endif