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diff --git a/indra/llmessage/llblowfishcipher.h b/indra/llmessage/llblowfishcipher.h
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+++ b/indra/llmessage/llblowfishcipher.h
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+/** 
+ * @file llblowfishcipher.h
+ * @brief A symmetric block cipher, designed in 1993 by Bruce Schneier.
+ * We use it because it has an 8 byte block size, allowing encryption of
+ * two UUIDs and a timestamp (16x2 + 4 = 36 bytes) with only 40 bytes of
+ * output.  AES has a block size of 32 bytes, so this would require 64 bytes.
+ *
+ * Copyright (c) 2007-$CurrentYear$, Linden Research, Inc.
+ * $License$
+ */
+
+#ifndef LLBLOWFISHCIPHER_H
+#define LLBLOWFISHCIPHER_H
+
+#include "llcipher.h"
+
+
+class LLBlowfishCipher : public LLCipher
+{
+public:
+	// Secret may be up to 56 bytes in length per Blowfish spec.
+	LLBlowfishCipher(const U8* secret, size_t secret_size);
+	virtual ~LLBlowfishCipher();
+
+	// See llcipher.h for documentation.
+	/*virtual*/ U32 encrypt(const U8* src, U32 src_len, U8* dst, U32 dst_len);
+	/*virtual*/ U32 decrypt(const U8* src, U32 src_len, U8* dst, U32 dst_len);
+	/*virtual*/ U32 requiredEncryptionSpace(U32 src_len) const;
+
+#ifdef _DEBUG
+	static BOOL testHarness();
+#endif
+
+private:
+	U8* mSecret;
+	size_t mSecretSize;
+};
+
+#endif // LL_LLCRYPTO_H