Imported existing code

indra/llmessage/llblowfishcipher.h

@@ -0,0 +1,63 @@
+/** 
+ * @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.
+ *
+ * $LicenseInfo:firstyear=2007&license=viewergpl$
+ * 
+ * Copyright (c) 2007-2009, Linden Research, Inc.
+ * 
+ * Second Life Viewer Source Code
+ * 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://secondlifegrid.net/programs/open_source/licensing/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://secondlifegrid.net/programs/open_source/licensing/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.
+ * $/LicenseInfo$
+ */
+
+#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