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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
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