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diff --git a/linden/indra/llmessage/llcrypto.h b/linden/indra/llmessage/llcrypto.h
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+/** 
+ * @file llcrypto.h
+ * @brief llcrypto library module header. For now, all crypto classes
+ * are here, and as we grow the library, we can split these things
+ * out.
+ *
+ * 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 LL_LLCRYPTO_H
+#define LL_LLCRYPTO_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
+        // encryption was successful, otherwise FALSE.
+        virtual BOOL encrypt(const U8* src, U32 src_len, U8* dst, U32 dst_len) = 0;
+
+        // decrypt src and place result into dst. returns TRUE if
+        // encryption was successful, otherwise FALSE. 
+        virtual BOOL decrpyt(const U8* src, U32 src_len, U8* dst, U32 dst_len) = 0;
+
+        // returns the space required to encrypt for a unencrypted source
+        // buffer of length len.
+        virtual U32 requiredEncryptionSpace(U32 src_len) const = 0 ;
+};
+
+
+//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+// Class LLNullCipher
+//
+// A class which implements LLCipher, but does not transform src
+// during encryption.
+//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+class LLNullCipher
+{
+public:
+        LLNullCipher() {}
+        virtual ~LLNullCipher() {}
+        virtual BOOL encrypt(const U8* src, U32 src_len, U8* dst, U32 dst_len);
+        virtual BOOL decrypt(const U8* src, U32 src_len, U8* dst, U32 dst_len);
+        virtual U32 requiredEncryptionSpace(U32 src_len);
+};
+
+//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+// Class LLXORCipher
+//
+// Implementation of LLCipher which encrypts using a XOR pad.
+//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+class LLXORCipher
+{
+public:
+        LLXORCipher(const U8* pad, U32 pad_len);
+        LLXORCipher(const LLXORCipher& cipher);
+        virtual ~LLXORCipher();
+        LLXORCipher& operator=(const LLXORCipher& cipher);
+
+        // Cipher functions
+        virtual BOOL encrypt(const U8* src, U32 src_len, U8* dst, U32 dst_len);
+        virtual BOOL decrypt(const U8* src, U32 src_len, U8* dst, U32 dst_len);
+        virtual U32 requiredEncryptionSpace(U32 src_len);
+
+        // special syntactic-sugar since xor can be performed in place.
+        BOOL encrypt(U8* buf, U32 len) { return encrypt((const U8*)buf, len, buf, len); }
+        BOOL decrypt(U8* buf, U32 len) { return decrypt((const U8*)buf, len, buf, len); }
+
+#ifdef _DEBUG
+        // This function runs tests to make sure the crc is
+        // working. Returns TRUE if it is.
+        static BOOL testHarness();
+#endif
+
+protected:
+        void init(const U8* pad, U32 pad_len);
+        U8* mPad;
+        U8* mHead;
+        U32 mPadLen;
+};
+
+#endif // LL_LLCRYPTO_H