1 files changed, 49 insertions, 0 deletions
diff --git a/indra/llmessage/llxorcipher.h b/indra/llmessage/llxorcipher.h
new file mode 100644
index 0000000000..1f0f58f62f
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+++ b/indra/llmessage/llxorcipher.h
@@ -0,0 +1,49 @@
+/** 
+ * @file llxorcipher.h
+ *
+ * Copyright (c) 2003-$CurrentYear$, Linden Research, Inc.
+ * $License$
+ */
+
+#ifndef LLXORCIPHER_H
+#define LLXORCIPHER_H
+
+#include "llcipher.h"
+
+//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+// Class LLXORCipher
+//
+// Implementation of LLCipher which encrypts using a XOR pad.
+//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+class LLXORCipher : public LLCipher
+{
+public:
+	LLXORCipher(const U8* pad, U32 pad_len);
+	LLXORCipher(const LLXORCipher& cipher);
+	virtual ~LLXORCipher();
+	LLXORCipher& operator=(const LLXORCipher& cipher);
+
+	// Cipher functions
+	/*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;
+
+	// 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