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/**
* @file llcipher.h
* @brief Abstract base class for encryption ciphers.
*
* $LicenseInfo:firstyear=2003&license=viewerlgpl$
* Second Life Viewer Source Code
* Copyright (C) 2010, Linden Research, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation;
* version 2.1 of the License only.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* Linden Research, Inc., 945 Battery Street, San Francisco, CA 94111 USA
* $/LicenseInfo$
*/
#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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