/** 
 * @file llnullcipher.cpp
 * @brief Implementation of a cipher which does not encrypt.
 *
 * $LicenseInfo:firstyear=2003&license=viewergpl$
 * 
 * Copyright (c) 2003-2009, 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
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 * 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
 * 
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 * ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
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 */

#include "linden_common.h"

#include "llnullcipher.h"

///----------------------------------------------------------------------------
/// Class LLNullCipher
///----------------------------------------------------------------------------

U32  LLNullCipher::encrypt(const U8* src, U32 src_len, U8* dst, U32 dst_len)
{
	if((src_len == dst_len) && src && dst)
	{
		memmove(dst, src, src_len);
		return src_len;
	}
	return 0;
}

U32 LLNullCipher::decrypt(const U8* src, U32 src_len, U8* dst, U32 dst_len)
{
	if((src_len == dst_len) && src && dst)
	{
		memmove(dst, src, src_len);
		return src_len;
	}
	return 0;
}

U32 LLNullCipher::requiredEncryptionSpace(U32 len) const
{
	return len;
}