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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*************************************************************************
*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* Copyright 2000, 2010 Oracle and/or its affiliates.
*
* OpenOffice.org - a multi-platform office productivity suite
*
* This file is part of OpenOffice.org.
*
* OpenOffice.org is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License version 3
* only, as published by the Free Software Foundation.
*
* OpenOffice.org 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 version 3 for more details
* (a copy is included in the LICENSE file that accompanied this code).
*
* You should have received a copy of the GNU Lesser General Public License
* version 3 along with OpenOffice.org. If not, see
* <http://www.openoffice.org/license.html>
* for a copy of the LGPLv3 License.
*
************************************************************************/
#ifdef _MSC_VER
#pragma hdrstop
#endif
#include <string.h>
#include <tools/string.hxx>
#include <crypter.hxx>
namespace binfilter {
Crypter::Crypter( const ByteString& r )
{
// Dies sind Randomwerte, die konstant zur Verschluesselung
// des Passworts verwendet werden. Durch die Verwendung eines
// verschluesselten Passworts wird vermieden, dass das Passwort
// im RAM gehalten wird.
static const BYTE cEncode[] =
{ 0xAB, 0x9E, 0x43, 0x05, 0x38, 0x12, 0x4d, 0x44,
0xD5, 0x7e, 0xe3, 0x84, 0x98, 0x23, 0x3f, 0xba };
xub_StrLen nLen = r.Len();
if( nLen > PASSWDLEN ) nLen = PASSWDLEN;
ByteString aPasswd( r );
if( nLen > PASSWDLEN )
aPasswd.Erase( nLen );
else
aPasswd.Expand( PASSWDLEN, ' ' );
memcpy( cPasswd, cEncode, PASSWDLEN );
Encrypt( aPasswd );
memcpy( cPasswd, aPasswd.GetBuffer(), PASSWDLEN );
}
void Crypter::Encrypt( ByteString& r ) const
{
xub_StrLen nLen = r.Len();
if( !nLen )
return ;
xub_StrLen nCryptPtr = 0;
BYTE cBuf[ PASSWDLEN ];
memcpy( cBuf, cPasswd, PASSWDLEN );
BYTE* pSrc = (BYTE*)r.GetBufferAccess();
BYTE* p = cBuf;
while( nLen-- )
{
*pSrc = *pSrc ^ ( *p ^ (BYTE) ( cBuf[ 0 ] * nCryptPtr ) );
*p += ( nCryptPtr < (PASSWDLEN-1) ) ? *(p+1) : cBuf[ 0 ];
if( !*p ) *p += 1;
p++;
if( ++nCryptPtr >= PASSWDLEN ) nCryptPtr = 0, p = cBuf;
pSrc++;
}
}
void Crypter::Decrypt( ByteString& r ) const
{
Encrypt( r );
}
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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