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/**
* @file llcipher.h
* @brief Abstract base class for encryption ciphers.
*
* $LicenseInfo:firstyear=2003&license=viewergpl$
*
* Copyright (c) 2003-2007, 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://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.
* $/LicenseInfo$
*/
#ifndef LLCIPHER_H
#define LLCIPHER_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
// Returns number of bytes written into dst, or 0 on error.
virtual U32 encrypt(const U8* src, U32 src_len, U8* dst, U32 dst_len) = 0;
// decrypt src and place result into dst.
// Returns number of bytes written into dst, or 0 on error.
virtual U32 decrypt(const U8* src, U32 src_len, U8* dst, U32 dst_len) = 0;
// returns the minimum amount of space required to encrypt for a
// unencrypted source buffer of length len.
// *NOTE: This is estimated space and you should check the return value
// of the encrypt function.
virtual U32 requiredEncryptionSpace(U32 src_len) const = 0 ;
};
#endif
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