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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 "filter/msfilter/mscodec.hxx"
#include <osl/diagnose.h>
#include <algorithm>
#include <string.h>
#include <tools/solar.h>
#include <comphelper/sequenceashashmap.hxx>
#include <comphelper/docpasswordhelper.hxx>
#define DEBUG_MSO_ENCRYPTION_STD97 0
#if DEBUG_MSO_ENCRYPTION_STD97
#include <stdio.h>
#endif
using namespace ::com::sun::star;
namespace msfilter {
// ============================================================================
namespace {
/** Rotates rnValue left by nBits bits. */
template< typename Type >
inline void lclRotateLeft( Type& rnValue, int nBits )
{
OSL_ASSERT(
nBits >= 0 &&
sal::static_int_cast< unsigned int >(nBits) < sizeof( Type ) * 8 );
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, sal_uInt8 nBits, sal_uInt8 nWidth )
{
OSL_ASSERT( (nBits < nWidth) && (nWidth < sizeof( Type ) * 8) );
Type nMask = static_cast< Type >( (1UL << nWidth) - 1 );
rnValue = static_cast< Type >(
((rnValue << nBits) | ((rnValue & nMask) >> (nWidth - nBits))) & nMask );
}
sal_Size lclGetLen( const sal_uInt8* pnPassData, sal_Size nBufferSize )
{
sal_Size nLen = 0;
while( (nLen < nBufferSize) && pnPassData[ nLen ] ) ++nLen;
return nLen;
}
sal_uInt16 lclGetKey( const sal_uInt8* pnPassData, sal_Size nBufferSize )
{
sal_Size nLen = lclGetLen( pnPassData, nBufferSize );
if( !nLen ) return 0;
sal_uInt16 nKey = 0;
sal_uInt16 nKeyBase = 0x8000;
sal_uInt16 nKeyEnd = 0xFFFF;
const sal_uInt8* pnChar = pnPassData + nLen - 1;
for( sal_Size nIndex = 0; nIndex < nLen; ++nIndex, --pnChar )
{
sal_uInt8 cChar = *pnChar & 0x7F;
for( sal_uInt8 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_Size nBufferSize )
{
sal_Size nLen = lclGetLen( pnPassData, nBufferSize );
sal_uInt16 nHash = static_cast< sal_uInt16 >( nLen );
if( nLen )
nHash ^= 0xCE4B;
const sal_uInt8* pnChar = pnPassData;
for( sal_Size nIndex = 0; nIndex < nLen; ++nIndex, ++pnChar )
{
sal_uInt16 cChar = *pnChar;
sal_uInt8 nRot = static_cast< sal_uInt8 >( (nIndex + 1) % 15 );
lclRotateLeft( cChar, nRot, 15 );
nHash ^= cChar;
}
return nHash;
}
} // namespace
// ============================================================================
MSCodec_Xor95::MSCodec_Xor95(int nRotateDistance) :
mnOffset( 0 ),
mnKey( 0 ),
mnHash( 0 ),
mnRotateDistance( nRotateDistance )
{
(void)memset( mpnKey, 0, sizeof( mpnKey ) );
}
MSCodec_Xor95::~MSCodec_Xor95()
{
(void)memset( mpnKey, 0, sizeof( mpnKey ) );
mnKey = mnHash = 0;
}
void MSCodec_Xor95::InitKey( const sal_uInt8 pnPassData[ 16 ] )
{
mnKey = lclGetKey( pnPassData, 16 );
mnHash = lclGetHash( pnPassData, 16 );
(void)memcpy( mpnKey, pnPassData, 16 );
static const sal_uInt8 spnFillChars[] =
{
0xBB, 0xFF, 0xFF, 0xBA,
0xFF, 0xFF, 0xB9, 0x80,
0x00, 0xBE, 0x0F, 0x00,
0xBF, 0x0F, 0x00
};
sal_Size nIndex;
sal_Size nLen = lclGetLen( pnPassData, 16 );
const sal_uInt8* pnFillChar = spnFillChars;
for( nIndex = nLen; nIndex < sizeof( mpnKey ); ++nIndex, ++pnFillChar )
mpnKey[ nIndex ] = *pnFillChar;
SVBT16 pnOrigKey;
ShortToSVBT16( mnKey, pnOrigKey );
sal_uInt8* pnKeyChar = mpnKey;
for( nIndex = 0; nIndex < sizeof( mpnKey ); ++nIndex, ++pnKeyChar )
{
*pnKeyChar ^= pnOrigKey[ nIndex & 0x01 ];
lclRotateLeft( *pnKeyChar, mnRotateDistance );
}
}
sal_Bool MSCodec_Xor95::InitCodec( const uno::Sequence< beans::NamedValue >& aData )
{
sal_Bool bResult = sal_False;
::comphelper::SequenceAsHashMap aHashData( aData );
uno::Sequence< sal_Int8 > aKey = aHashData.getUnpackedValueOrDefault( ::rtl::OUString( RTL_CONSTASCII_USTRINGPARAM( "XOR95EncryptionKey" ) ), uno::Sequence< sal_Int8 >() );
if ( aKey.getLength() == 16 )
{
(void)memcpy( mpnKey, aKey.getConstArray(), 16 );
bResult = sal_True;
mnKey = (sal_uInt16)aHashData.getUnpackedValueOrDefault( ::rtl::OUString( RTL_CONSTASCII_USTRINGPARAM( "XOR95BaseKey" ) ), (sal_Int16)0 );
mnHash = (sal_uInt16)aHashData.getUnpackedValueOrDefault( ::rtl::OUString( RTL_CONSTASCII_USTRINGPARAM( "XOR95PasswordHash" ) ), (sal_Int16)0 );
}
else
OSL_FAIL( "Unexpected key size!\n" );
return bResult;
}
uno::Sequence< beans::NamedValue > MSCodec_Xor95::GetEncryptionData()
{
::comphelper::SequenceAsHashMap aHashData;
aHashData[ ::rtl::OUString( RTL_CONSTASCII_USTRINGPARAM( "XOR95EncryptionKey" ) ) ] <<= uno::Sequence<sal_Int8>( (sal_Int8*)mpnKey, 16 );
aHashData[ ::rtl::OUString( RTL_CONSTASCII_USTRINGPARAM( "XOR95BaseKey" ) ) ] <<= (sal_Int16)mnKey;
aHashData[ ::rtl::OUString( RTL_CONSTASCII_USTRINGPARAM( "XOR95PasswordHash" ) ) ] <<= (sal_Int16)mnHash;
return aHashData.getAsConstNamedValueList();
}
bool MSCodec_Xor95::VerifyKey( sal_uInt16 nKey, sal_uInt16 nHash ) const
{
return (nKey == mnKey) && (nHash == mnHash);
}
void MSCodec_Xor95::InitCipher()
{
mnOffset = 0;
}
void MSCodec_XorXLS95::Decode( sal_uInt8* pnData, sal_Size nBytes )
{
const sal_uInt8* pnCurrKey = mpnKey + mnOffset;
const sal_uInt8* pnKeyLast = mpnKey + 0x0F;
for( const sal_uInt8* pnDataEnd = pnData + nBytes; pnData < pnDataEnd; ++pnData )
{
lclRotateLeft( *pnData, 3 );
*pnData ^= *pnCurrKey;
if( pnCurrKey < pnKeyLast ) ++pnCurrKey; else pnCurrKey = mpnKey;
}
// update mnOffset
Skip( nBytes );
}
void MSCodec_XorWord95::Decode( sal_uInt8* pnData, sal_Size nBytes )
{
const sal_uInt8* pnCurrKey = mpnKey + mnOffset;
const sal_uInt8* pnKeyLast = mpnKey + 0x0F;
for( const sal_uInt8* pnDataEnd = pnData + nBytes; pnData < pnDataEnd; ++pnData )
{
const sal_uInt8 cChar = *pnData ^ *pnCurrKey;
if (*pnData && cChar)
*pnData = cChar;
if( pnCurrKey < pnKeyLast ) ++pnCurrKey; else pnCurrKey = mpnKey;
}
// update mnOffset
Skip( nBytes );
}
void MSCodec_Xor95::Skip( sal_Size nBytes )
{
mnOffset = (mnOffset + nBytes) & 0x0F;
}
// ============================================================================
MSCodec_Std97::MSCodec_Std97 ()
{
m_hCipher = rtl_cipher_create (
rtl_Cipher_AlgorithmARCFOUR, rtl_Cipher_ModeStream);
OSL_ASSERT(m_hCipher != 0);
m_hDigest = rtl_digest_create (
rtl_Digest_AlgorithmMD5);
OSL_ASSERT(m_hDigest != 0);
(void)memset (m_pDigestValue, 0, sizeof(m_pDigestValue));
(void)memset (m_pDocId, 0, sizeof(m_pDocId));
}
MSCodec_Std97::~MSCodec_Std97 ()
{
(void)memset (m_pDigestValue, 0, sizeof(m_pDigestValue));
(void)memset (m_pDocId, 0, sizeof(m_pDocId));
rtl_digest_destroy (m_hDigest);
rtl_cipher_destroy (m_hCipher);
}
#if DEBUG_MSO_ENCRYPTION_STD97
static void lcl_PrintDigest(const sal_uInt8* pDigest, const char* msg)
{
printf("digest: (%s)\n", msg);
for (int i = 0; i < 16; ++i)
printf("%2.2x ", pDigest[i]);
printf("\n");
}
#else
static void lcl_PrintDigest(const sal_uInt8* /*pDigest*/, const char* /*msg*/)
{
}
#endif
sal_Bool MSCodec_Std97::InitCodec( const uno::Sequence< beans::NamedValue >& aData )
{
#if DEBUG_MSO_ENCRYPTION_STD97
fprintf(stdout, "MSCodec_Std97::InitCodec: --begin\n");fflush(stdout);
#endif
sal_Bool bResult = sal_False;
::comphelper::SequenceAsHashMap aHashData( aData );
uno::Sequence< sal_Int8 > aKey = aHashData.getUnpackedValueOrDefault( ::rtl::OUString( RTL_CONSTASCII_USTRINGPARAM( "STD97EncryptionKey" ) ), uno::Sequence< sal_Int8 >() );
if ( aKey.getLength() == RTL_DIGEST_LENGTH_MD5 )
{
(void)memcpy( m_pDigestValue, aKey.getConstArray(), RTL_DIGEST_LENGTH_MD5 );
uno::Sequence< sal_Int8 > aUniqueID = aHashData.getUnpackedValueOrDefault( ::rtl::OUString( RTL_CONSTASCII_USTRINGPARAM( "STD97UniqueID" ) ), uno::Sequence< sal_Int8 >() );
if ( aUniqueID.getLength() == 16 )
{
(void)memcpy( m_pDocId, aUniqueID.getConstArray(), 16 );
bResult = sal_True;
lcl_PrintDigest(m_pDigestValue, "digest value");
lcl_PrintDigest(m_pDocId, "DocId value");
}
else
OSL_FAIL( "Unexpected document ID!\n" );
}
else
OSL_FAIL( "Unexpected key size!\n" );
return bResult;
}
uno::Sequence< beans::NamedValue > MSCodec_Std97::GetEncryptionData()
{
::comphelper::SequenceAsHashMap aHashData;
aHashData[ ::rtl::OUString( RTL_CONSTASCII_USTRINGPARAM( "STD97EncryptionKey" ) ) ] <<= uno::Sequence< sal_Int8 >( (sal_Int8*)m_pDigestValue, RTL_DIGEST_LENGTH_MD5 );
aHashData[ ::rtl::OUString( RTL_CONSTASCII_USTRINGPARAM( "STD97UniqueID" ) ) ] <<= uno::Sequence< sal_Int8 >( (sal_Int8*)m_pDocId, 16 );
return aHashData.getAsConstNamedValueList();
}
void MSCodec_Std97::InitKey (
const sal_uInt16 pPassData[16],
const sal_uInt8 pDocId[16])
{
#if DEBUG_MSO_ENCRYPTION_STD97
fprintf(stdout, "MSCodec_Std97::InitKey: --begin\n");fflush(stdout);
#endif
uno::Sequence< sal_Int8 > aKey = ::comphelper::DocPasswordHelper::GenerateStd97Key( pPassData, uno::Sequence< sal_Int8 >( (sal_Int8*)pDocId, 16 ) );
// Fill raw digest of above updates into DigestValue.
if ( aKey.getLength() == sizeof(m_pDigestValue) )
(void)memcpy ( m_pDigestValue, aKey.getConstArray(), sizeof(m_pDigestValue) );
else
memset( m_pDigestValue, 0, sizeof(m_pDigestValue) );
lcl_PrintDigest(m_pDigestValue, "digest value");
(void)memcpy (m_pDocId, pDocId, 16);
lcl_PrintDigest(m_pDocId, "DocId value");
}
bool MSCodec_Std97::VerifyKey (
const sal_uInt8 pSaltData[16],
const sal_uInt8 pSaltDigest[16])
{
// both the salt data and salt digest (hash) come from the document being imported.
#if DEBUG_MSO_ENCRYPTION_STD97
fprintf(stdout, "MSCodec_Std97::VerifyKey: \n");
lcl_PrintDigest(pSaltData, "salt data");
lcl_PrintDigest(pSaltDigest, "salt hash");
#endif
bool result = false;
if (InitCipher(0))
{
sal_uInt8 pDigest[RTL_DIGEST_LENGTH_MD5];
GetDigestFromSalt(pSaltData, pDigest);
sal_uInt8 pBuffer[16];
// Decode original SaltDigest into Buffer.
rtl_cipher_decode (
m_hCipher, pSaltDigest, 16, pBuffer, sizeof(pBuffer));
// Compare Buffer with computed Digest.
result = (memcmp (pBuffer, pDigest, sizeof(pDigest)) == 0);
// Erase Buffer and Digest arrays.
(void)memset (pBuffer, 0, sizeof(pBuffer));
(void)memset (pDigest, 0, sizeof(pDigest));
}
return (result);
}
bool MSCodec_Std97::InitCipher (sal_uInt32 nCounter)
{
rtlCipherError result;
sal_uInt8 pKeyData[64]; // 512-bit message block
// Initialize KeyData array.
(void)memset (pKeyData, 0, sizeof(pKeyData));
// Fill 40 bit of DigestValue into [0..4].
(void)memcpy (pKeyData, m_pDigestValue, 5);
// Fill counter into [5..8].
pKeyData[ 5] = sal_uInt8((nCounter >> 0) & 0xff);
pKeyData[ 6] = sal_uInt8((nCounter >> 8) & 0xff);
pKeyData[ 7] = sal_uInt8((nCounter >> 16) & 0xff);
pKeyData[ 8] = sal_uInt8((nCounter >> 24) & 0xff);
pKeyData[ 9] = 0x80;
pKeyData[56] = 0x48;
// Fill raw digest of KeyData into KeyData.
(void)rtl_digest_updateMD5 (
m_hDigest, pKeyData, sizeof(pKeyData));
(void)rtl_digest_rawMD5 (
m_hDigest, pKeyData, RTL_DIGEST_LENGTH_MD5);
// Initialize Cipher with KeyData (for decoding).
result = rtl_cipher_init (
m_hCipher, rtl_Cipher_DirectionBoth,
pKeyData, RTL_DIGEST_LENGTH_MD5, 0, 0);
// Erase KeyData array and leave.
(void)memset (pKeyData, 0, sizeof(pKeyData));
return (result == rtl_Cipher_E_None);
}
bool MSCodec_Std97::CreateSaltDigest( const sal_uInt8 nSaltData[16], sal_uInt8 nSaltDigest[16] )
{
#if DEBUG_MSO_ENCRYPTION_STD97
lcl_PrintDigest(nSaltData, "salt data");
#endif
bool result = false;
if (InitCipher(0))
{
sal_uInt8 pDigest[RTL_DIGEST_LENGTH_MD5];
GetDigestFromSalt(nSaltData, pDigest);
rtl_cipher_decode (
m_hCipher, pDigest, 16, pDigest, sizeof(pDigest));
(void)memcpy(nSaltDigest, pDigest, 16);
}
return (result);
}
bool MSCodec_Std97::Encode (
const void *pData, sal_Size nDatLen,
sal_uInt8 *pBuffer, sal_Size nBufLen)
{
rtlCipherError result;
result = rtl_cipher_encode (
m_hCipher, pData, nDatLen, pBuffer, nBufLen);
return (result == rtl_Cipher_E_None);
}
bool MSCodec_Std97::Decode (
const void *pData, sal_Size nDatLen,
sal_uInt8 *pBuffer, sal_Size nBufLen)
{
rtlCipherError result;
result = rtl_cipher_decode (
m_hCipher, pData, nDatLen, pBuffer, nBufLen);
return (result == rtl_Cipher_E_None);
}
bool MSCodec_Std97::Skip( sal_Size nDatLen )
{
sal_uInt8 pnDummy[ 1024 ];
sal_Size nDatLeft = nDatLen;
bool bResult = true;
while (bResult && nDatLeft)
{
sal_Size nBlockLen = ::std::min< sal_Size >( nDatLeft, sizeof(pnDummy) );
bResult = Decode( pnDummy, nBlockLen, pnDummy, nBlockLen );
nDatLeft -= nBlockLen;
}
return bResult;
}
void MSCodec_Std97::GetDigestFromSalt( const sal_uInt8 pSaltData[16], sal_uInt8 pDigest[16] )
{
sal_uInt8 pBuffer[64];
sal_uInt8 pDigestLocal[16];
// Decode SaltData into Buffer.
rtl_cipher_decode (
m_hCipher, pSaltData, 16, pBuffer, sizeof(pBuffer));
// set the 129th bit to make the buffer 128-bit in length.
pBuffer[16] = 0x80;
// erase the rest of the buffer with zeros.
(void)memset (pBuffer + 17, 0, sizeof(pBuffer) - 17);
// set the 441st bit.
pBuffer[56] = 0x80;
// Fill raw digest of Buffer into Digest.
rtl_digest_updateMD5 (
m_hDigest, pBuffer, sizeof(pBuffer));
rtl_digest_rawMD5 (
m_hDigest, pDigestLocal, sizeof(pDigestLocal));
memcpy(pDigest, pDigestLocal, 16);
}
void MSCodec_Std97::GetEncryptKey (
const sal_uInt8 pSalt[16],
sal_uInt8 pSaltData[16],
sal_uInt8 pSaltDigest[16])
{
if (InitCipher(0))
{
sal_uInt8 pDigest[RTL_DIGEST_LENGTH_MD5];
sal_uInt8 pBuffer[64];
rtl_cipher_encode (
m_hCipher, pSalt, 16, pSaltData, sizeof(pBuffer));
(void)memcpy( pBuffer, pSalt, 16 );
pBuffer[16] = 0x80;
(void)memset (pBuffer + 17, 0, sizeof(pBuffer) - 17);
pBuffer[56] = 0x80;
rtl_digest_updateMD5 (
m_hDigest, pBuffer, sizeof(pBuffer));
rtl_digest_rawMD5 (
m_hDigest, pDigest, sizeof(pDigest));
rtl_cipher_encode (
m_hCipher, pDigest, 16, pSaltDigest, 16);
(void)memset (pBuffer, 0, sizeof(pBuffer));
(void)memset (pDigest, 0, sizeof(pDigest));
}
}
void MSCodec_Std97::GetDocId( sal_uInt8 pDocId[16] )
{
if ( sizeof( m_pDocId ) == 16 )
(void)memcpy( pDocId, m_pDocId, 16 );
}
// ============================================================================
} // namespace svx
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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