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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
* This file is part of the LibreOffice project.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
* This file incorporates work covered by the following license notice:
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed
* with this work for additional information regarding copyright
* ownership. The ASF licenses this file to you under the Apache
* License, Version 2.0 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.apache.org/licenses/LICENSE-2.0 .
*/
#include "oox/core/binarycodec.hxx"
#include <algorithm>
#include <string.h>
#include "oox/helper/attributelist.hxx"
#include <osl/diagnose.h>
#include <comphelper/sequenceashashmap.hxx>
#include <comphelper/docpasswordhelper.hxx>
using namespace ::com::sun::star;
namespace oox {
namespace core {
namespace {
/** Rotates rnValue left by nBits bits. */
template< typename Type >
inline void lclRotateLeft( Type& rnValue, size_t nBits )
{
OSL_ENSURE( nBits < sizeof( Type ) * 8, "lclRotateLeft - rotation count overflow" );
rnValue = static_cast< Type >( (rnValue << nBits) | (rnValue >> (sizeof( Type ) * 8 - nBits)) );
}
/** Rotates the lower nWidth bits of rnValue left by nBits bits. */
template< typename Type >
inline void lclRotateLeft( Type& rnValue, size_t nBits, size_t nWidth )
{
OSL_ENSURE( (nBits < nWidth) && (nWidth < sizeof( Type ) * 8), "lclRotateLeft - rotation count overflow" );
Type nMask = static_cast< Type >( (1UL << nWidth) - 1 );
rnValue = static_cast< Type >(
((rnValue << nBits) | ((rnValue & nMask) >> (nWidth - nBits))) & nMask );
}
sal_Int32 lclGetLen( const sal_uInt8* pnPassData, sal_Int32 nBufferSize )
{
sal_Int32 nLen = 0;
while( (nLen < nBufferSize) && pnPassData[ nLen ] ) ++nLen;
return nLen;
}
sal_uInt16 lclGetKey( const sal_uInt8* pnPassData, sal_Int32 nBufferSize )
{
sal_Int32 nLen = lclGetLen( pnPassData, nBufferSize );
if( nLen <= 0 ) return 0;
sal_uInt16 nKey = 0;
sal_uInt16 nKeyBase = 0x8000;
sal_uInt16 nKeyEnd = 0xFFFF;
const sal_uInt8* pnChar = pnPassData + nLen - 1;
for( sal_Int32 nIndex = 0; nIndex < nLen; ++nIndex, --pnChar )
{
sal_uInt8 cChar = *pnChar & 0x7F;
for( size_t nBit = 0; nBit < 8; ++nBit )
{
lclRotateLeft( nKeyBase, 1 );
if( nKeyBase & 1 ) nKeyBase ^= 0x1020;
if( cChar & 1 ) nKey ^= nKeyBase;
cChar >>= 1;
lclRotateLeft( nKeyEnd, 1 );
if( nKeyEnd & 1 ) nKeyEnd ^= 0x1020;
}
}
return nKey ^ nKeyEnd;
}
sal_uInt16 lclGetHash( const sal_uInt8* pnPassData, sal_Int32 nBufferSize )
{
sal_Int32 nLen = lclGetLen( pnPassData, nBufferSize );
sal_uInt16 nHash = static_cast< sal_uInt16 >( nLen );
if( nLen > 0 )
nHash ^= 0xCE4B;
const sal_uInt8* pnChar = pnPassData;
for( sal_Int32 nIndex = 0; nIndex < nLen; ++nIndex, ++pnChar )
{
sal_uInt16 cChar = *pnChar;
size_t nRot = static_cast< size_t >( (nIndex + 1) % 15 );
lclRotateLeft( cChar, nRot, 15 );
nHash ^= cChar;
}
return nHash;
}
} // namespace
sal_uInt16 CodecHelper::getPasswordHash( const AttributeList& rAttribs, sal_Int32 nElement )
{
sal_Int32 nPasswordHash = rAttribs.getIntegerHex( nElement, 0 );
OSL_ENSURE( (0 <= nPasswordHash) && (nPasswordHash <= SAL_MAX_UINT16), "CodecHelper::getPasswordHash - invalid password hash" );
return static_cast< sal_uInt16 >( ((0 <= nPasswordHash) && (nPasswordHash <= SAL_MAX_UINT16)) ? nPasswordHash : 0 );
}
BinaryCodec_XOR::BinaryCodec_XOR( CodecType eCodecType ) :
meCodecType( eCodecType ),
mnOffset( 0 ),
mnBaseKey( 0 ),
mnHash( 0 )
{
(void)memset( mpnKey, 0, sizeof( mpnKey ) );
}
BinaryCodec_XOR::~BinaryCodec_XOR()
{
(void)memset( mpnKey, 0, sizeof( mpnKey ) );
mnBaseKey = mnHash = 0;
}
void BinaryCodec_XOR::initKey( const sal_uInt8 pnPassData[ 16 ] )
{
// calculate base key and hash from passed password
mnBaseKey = lclGetKey( pnPassData, 16 );
mnHash = lclGetHash( pnPassData, 16 );
static const sal_uInt8 spnFillChars[] =
{
0xBB, 0xFF, 0xFF, 0xBA,
0xFF, 0xFF, 0xB9, 0x80,
0x00, 0xBE, 0x0F, 0x00,
0xBF, 0x0F, 0x00
};
(void)memcpy( mpnKey, pnPassData, 16 );
sal_Int32 nIndex;
sal_Int32 nLen = lclGetLen( pnPassData, 16 );
const sal_uInt8* pnFillChar = spnFillChars;
for( nIndex = nLen; nIndex < static_cast< sal_Int32 >( sizeof( mpnKey ) ); ++nIndex, ++pnFillChar )
mpnKey[ nIndex ] = *pnFillChar;
// rotation of key values is application dependent
size_t nRotateSize = 0;
switch( meCodecType )
{
case CODEC_WORD: nRotateSize = 7; break;
case CODEC_EXCEL: nRotateSize = 2; break;
// compiler will warn, if new codec type is introduced and not handled here
}
// use little-endian base key to create key array
sal_uInt8 pnBaseKeyLE[ 2 ];
pnBaseKeyLE[ 0 ] = static_cast< sal_uInt8 >( mnBaseKey );
pnBaseKeyLE[ 1 ] = static_cast< sal_uInt8 >( mnBaseKey >> 8 );
sal_uInt8* pnKeyChar = mpnKey;
for( nIndex = 0; nIndex < static_cast< sal_Int32 >( sizeof( mpnKey ) ); ++nIndex, ++pnKeyChar )
{
*pnKeyChar ^= pnBaseKeyLE[ nIndex & 1 ];
lclRotateLeft( *pnKeyChar, nRotateSize );
}
}
bool BinaryCodec_XOR::initCodec( const uno::Sequence< beans::NamedValue >& aData )
{
bool bResult = false;
::comphelper::SequenceAsHashMap aHashData( aData );
uno::Sequence< sal_Int8 > aKey = aHashData.getUnpackedValueOrDefault("XOR95EncryptionKey", uno::Sequence< sal_Int8 >() );
if ( aKey.getLength() == 16 )
{
(void)memcpy( mpnKey, aKey.getConstArray(), 16 );
bResult = true;
mnBaseKey = (sal_uInt16)aHashData.getUnpackedValueOrDefault("XOR95BaseKey", (sal_Int16)0 );
mnHash = (sal_uInt16)aHashData.getUnpackedValueOrDefault("XOR95PasswordHash", (sal_Int16)0 );
}
else
OSL_FAIL( "Unexpected key size!\n" );
return bResult;
}
uno::Sequence< beans::NamedValue > BinaryCodec_XOR::getEncryptionData()
{
::comphelper::SequenceAsHashMap aHashData;
aHashData[ OUString("XOR95EncryptionKey") ] <<= uno::Sequence<sal_Int8>( reinterpret_cast<sal_Int8*>(mpnKey), 16 );
aHashData[ OUString("XOR95BaseKey") ] <<= (sal_Int16)mnBaseKey;
aHashData[ OUString("XOR95PasswordHash") ] <<= (sal_Int16)mnHash;
return aHashData.getAsConstNamedValueList();
}
bool BinaryCodec_XOR::verifyKey( sal_uInt16 nKey, sal_uInt16 nHash ) const
{
return (nKey == mnBaseKey) && (nHash == mnHash);
}
void BinaryCodec_XOR::startBlock()
{
mnOffset = 0;
}
bool BinaryCodec_XOR::decode( sal_uInt8* pnDestData, const sal_uInt8* pnSrcData, sal_Int32 nBytes )
{
const sal_uInt8* pnCurrKey = mpnKey + mnOffset;
const sal_uInt8* pnKeyLast = mpnKey + 0x0F;
// switch/case outside of the for loop (performance)
const sal_uInt8* pnSrcDataEnd = pnSrcData + nBytes;
switch( meCodecType )
{
case CODEC_WORD:
{
for( ; pnSrcData < pnSrcDataEnd; ++pnSrcData, ++pnDestData )
{
sal_uInt8 nData = *pnSrcData ^ *pnCurrKey;
if( (*pnSrcData != 0) && (nData != 0) )
*pnDestData = nData;
if( pnCurrKey < pnKeyLast ) ++pnCurrKey; else pnCurrKey = mpnKey;
}
}
break;
case CODEC_EXCEL:
{
for( ; pnSrcData < pnSrcDataEnd; ++pnSrcData, ++pnDestData )
{
*pnDestData = *pnSrcData;
lclRotateLeft( *pnDestData, 3 );
*pnDestData ^= *pnCurrKey;
if( pnCurrKey < pnKeyLast ) ++pnCurrKey; else pnCurrKey = mpnKey;
}
}
break;
// compiler will warn, if new codec type is introduced and not handled here
}
// update offset and leave
return skip( nBytes );
}
bool BinaryCodec_XOR::skip( sal_Int32 nBytes )
{
mnOffset = static_cast< sal_Int32 >( (mnOffset + nBytes) & 0x0F );
return true;
}
BinaryCodec_RCF::BinaryCodec_RCF()
{
mhCipher = rtl_cipher_create( rtl_Cipher_AlgorithmARCFOUR, rtl_Cipher_ModeStream );
OSL_ENSURE( mhCipher != 0, "BinaryCodec_RCF::BinaryCodec_RCF - cannot create cipher" );
mhDigest = rtl_digest_create( rtl_Digest_AlgorithmMD5 );
OSL_ENSURE( mhDigest != 0, "BinaryCodec_RCF::BinaryCodec_RCF - cannot create digest" );
(void)memset( mpnDigestValue, 0, sizeof( mpnDigestValue ) );
(void)memset (mpnUnique, 0, sizeof(mpnUnique));
}
BinaryCodec_RCF::~BinaryCodec_RCF()
{
(void)memset( mpnDigestValue, 0, sizeof( mpnDigestValue ) );
(void)memset (mpnUnique, 0, sizeof(mpnUnique));
rtl_digest_destroy( mhDigest );
rtl_cipher_destroy( mhCipher );
}
bool BinaryCodec_RCF::initCodec( const uno::Sequence< beans::NamedValue >& aData )
{
bool bResult = false;
::comphelper::SequenceAsHashMap aHashData( aData );
uno::Sequence< sal_Int8 > aKey = aHashData.getUnpackedValueOrDefault("STD97EncryptionKey", uno::Sequence< sal_Int8 >() );
if ( aKey.getLength() == RTL_DIGEST_LENGTH_MD5 )
{
(void)memcpy( mpnDigestValue, aKey.getConstArray(), RTL_DIGEST_LENGTH_MD5 );
uno::Sequence< sal_Int8 > aUniqueID = aHashData.getUnpackedValueOrDefault("STD97UniqueID", uno::Sequence< sal_Int8 >() );
if ( aUniqueID.getLength() == 16 )
{
(void)memcpy( mpnUnique, aUniqueID.getConstArray(), 16 );
bResult = false;
}
else
OSL_FAIL( "Unexpected document ID!\n" );
}
else
OSL_FAIL( "Unexpected key size!\n" );
return bResult;
}
uno::Sequence< beans::NamedValue > BinaryCodec_RCF::getEncryptionData()
{
::comphelper::SequenceAsHashMap aHashData;
aHashData[ OUString("STD97EncryptionKey") ] <<= uno::Sequence< sal_Int8 >( reinterpret_cast<sal_Int8*>(mpnDigestValue), RTL_DIGEST_LENGTH_MD5 );
aHashData[ OUString("STD97UniqueID") ] <<= uno::Sequence< sal_Int8 >( reinterpret_cast<sal_Int8*>(mpnUnique), 16 );
return aHashData.getAsConstNamedValueList();
}
void BinaryCodec_RCF::initKey( const sal_uInt16 pnPassData[ 16 ], const sal_uInt8 pnSalt[ 16 ] )
{
uno::Sequence< sal_Int8 > aKey = ::comphelper::DocPasswordHelper::GenerateStd97Key( pnPassData, uno::Sequence< sal_Int8 >( reinterpret_cast<sal_Int8 const *>(pnSalt), 16 ) );
// Fill raw digest of above updates into DigestValue.
if ( aKey.getLength() == sizeof(mpnDigestValue) )
(void)memcpy ( mpnDigestValue, aKey.getConstArray(), sizeof(mpnDigestValue) );
else
memset( mpnDigestValue, 0, sizeof(mpnDigestValue) );
(void)memcpy( mpnUnique, pnSalt, 16 );
}
bool BinaryCodec_RCF::verifyKey( const sal_uInt8 pnVerifier[ 16 ], const sal_uInt8 pnVerifierHash[ 16 ] )
{
if( !startBlock( 0 ) )
return false;
sal_uInt8 pnDigest[ RTL_DIGEST_LENGTH_MD5 ];
sal_uInt8 pnBuffer[ 64 ];
// decode salt data into buffer
rtl_cipher_decode( mhCipher, pnVerifier, 16, pnBuffer, sizeof( pnBuffer ) );
pnBuffer[ 16 ] = 0x80;
(void)memset( pnBuffer + 17, 0, sizeof( pnBuffer ) - 17 );
pnBuffer[ 56 ] = 0x80;
// fill raw digest of buffer into digest
rtl_digest_updateMD5( mhDigest, pnBuffer, sizeof( pnBuffer ) );
rtl_digest_rawMD5( mhDigest, pnDigest, sizeof( pnDigest ) );
// decode original salt digest into buffer
rtl_cipher_decode( mhCipher, pnVerifierHash, 16, pnBuffer, sizeof( pnBuffer ) );
// compare buffer with computed digest
bool bResult = memcmp( pnBuffer, pnDigest, sizeof( pnDigest ) ) == 0;
// erase buffer and digest arrays and leave
rtl_secureZeroMemory (pnBuffer, sizeof(pnBuffer));
rtl_secureZeroMemory (pnDigest, sizeof(pnDigest));
return bResult;
}
bool BinaryCodec_RCF::startBlock( sal_Int32 nCounter )
{
// initialize key data array
sal_uInt8 pnKeyData[ 64 ];
(void)memset( pnKeyData, 0, sizeof( pnKeyData ) );
// fill 40 bit of digest value into [0..4]
(void)memcpy( pnKeyData, mpnDigestValue, 5 );
// fill little-endian counter into [5..8], static_cast masks out unneeded bits
pnKeyData[ 5 ] = static_cast< sal_uInt8 >( nCounter );
pnKeyData[ 6 ] = static_cast< sal_uInt8 >( nCounter >> 8 );
pnKeyData[ 7 ] = static_cast< sal_uInt8 >( nCounter >> 16 );
pnKeyData[ 8 ] = static_cast< sal_uInt8 >( nCounter >> 24 );
pnKeyData[ 9 ] = 0x80;
pnKeyData[ 56 ] = 0x48;
// fill raw digest of key data into key data
(void)rtl_digest_updateMD5( mhDigest, pnKeyData, sizeof( pnKeyData ) );
(void)rtl_digest_rawMD5( mhDigest, pnKeyData, RTL_DIGEST_LENGTH_MD5 );
// initialize cipher with key data (for decoding)
rtlCipherError eResult =
rtl_cipher_init( mhCipher, rtl_Cipher_DirectionDecode, pnKeyData, RTL_DIGEST_LENGTH_MD5, 0, 0 );
// erase key data array and leave
rtl_secureZeroMemory (pnKeyData, sizeof(pnKeyData));
return eResult == rtl_Cipher_E_None;
}
bool BinaryCodec_RCF::decode( sal_uInt8* pnDestData, const sal_uInt8* pnSrcData, sal_Int32 nBytes )
{
rtlCipherError eResult = rtl_cipher_decode( mhCipher,
pnSrcData, static_cast< sal_Size >( nBytes ),
pnDestData, static_cast< sal_Size >( nBytes ) );
return eResult == rtl_Cipher_E_None;
}
bool BinaryCodec_RCF::skip( sal_Int32 nBytes )
{
// decode dummy data in memory to update internal state of RC4 cipher
sal_uInt8 pnDummy[ 1024 ];
sal_Int32 nBytesLeft = nBytes;
bool bResult = true;
while( bResult && (nBytesLeft > 0) )
{
sal_Int32 nBlockLen = ::std::min( nBytesLeft, static_cast< sal_Int32 >( sizeof( pnDummy ) ) );
bResult = decode( pnDummy, pnDummy, nBlockLen );
nBytesLeft -= nBlockLen;
}
return bResult;
}
} // namespace core
} // namespace oox
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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