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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 <sal/config.h>
#include <com/sun/star/lang/DisposedException.hpp>
#include <osl/diagnose.h>
#include <rtl/random.h>
#include <rtl/ref.hxx>
#include "ciphercontext.hxx"
#include <pk11pub.h>
using namespace ::com::sun::star;
uno::Reference< xml::crypto::XCipherContext > OCipherContext::Create( CK_MECHANISM_TYPE nNSSCipherID, const uno::Sequence< ::sal_Int8 >& aKey, const uno::Sequence< ::sal_Int8 >& aInitializationVector, bool bEncryption, bool bW3CPadding )
{
::rtl::Reference< OCipherContext > xResult = new OCipherContext;
xResult->m_pSlot = PK11_GetBestSlot( nNSSCipherID, nullptr );
if ( xResult->m_pSlot )
{
SECItem aKeyItem = { siBuffer, const_cast< unsigned char* >( reinterpret_cast< const unsigned char* >( aKey.getConstArray() ) ), sal::static_int_cast<unsigned>( aKey.getLength() ) };
xResult->m_pSymKey = PK11_ImportSymKey( xResult->m_pSlot, nNSSCipherID, PK11_OriginDerive, bEncryption ? CKA_ENCRYPT : CKA_DECRYPT, &aKeyItem, nullptr );
if ( xResult->m_pSymKey )
{
SECItem aIVItem = { siBuffer, const_cast< unsigned char* >( reinterpret_cast< const unsigned char* >( aInitializationVector.getConstArray() ) ), sal::static_int_cast<unsigned>( aInitializationVector.getLength() ) };
xResult->m_pSecParam = PK11_ParamFromIV( nNSSCipherID, &aIVItem );
if ( xResult->m_pSecParam )
{
xResult->m_pContext = PK11_CreateContextBySymKey( nNSSCipherID, bEncryption ? CKA_ENCRYPT : CKA_DECRYPT, xResult->m_pSymKey, xResult->m_pSecParam);
if ( xResult->m_pContext )
{
xResult->m_bEncryption = bEncryption;
xResult->m_bW3CPadding = bW3CPadding;
xResult->m_bPadding = bW3CPadding || ( PK11_GetPadMechanism( nNSSCipherID ) == nNSSCipherID );
xResult->m_nBlockSize = PK11_GetBlockSize( nNSSCipherID, xResult->m_pSecParam );
if ( xResult->m_nBlockSize <= SAL_MAX_INT8 )
return xResult.get();
}
}
}
}
return uno::Reference< xml::crypto::XCipherContext >();
}
void OCipherContext::Dispose()
{
::osl::MutexGuard aGuard( m_aMutex );
if ( m_pContext )
{
PK11_DestroyContext( m_pContext, PR_TRUE );
m_pContext = nullptr;
}
if ( m_pSecParam )
{
SECITEM_FreeItem( m_pSecParam, PR_TRUE );
m_pSecParam = nullptr;
}
if ( m_pSymKey )
{
PK11_FreeSymKey( m_pSymKey );
m_pSymKey = nullptr;
}
if ( m_pSlot )
{
PK11_FreeSlot( m_pSlot );
m_pSlot = nullptr;
}
m_bDisposed = true;
}
uno::Sequence< ::sal_Int8 > SAL_CALL OCipherContext::convertWithCipherContext( const uno::Sequence< ::sal_Int8 >& aData )
{
::osl::MutexGuard aGuard( m_aMutex );
if ( m_bBroken )
throw uno::RuntimeException();
if ( m_bDisposed )
throw lang::DisposedException();
uno::Sequence< sal_Int8 > aToConvert;
if ( aData.hasElements() )
{
sal_Int32 nOldLastBlockLen = m_aLastBlock.getLength();
OSL_ENSURE( nOldLastBlockLen <= m_nBlockSize, "Unexpected last block size!" );
sal_Int32 nAvailableData = nOldLastBlockLen + aData.getLength();
sal_Int32 nToConvertLen;
if ( m_bEncryption || !m_bW3CPadding )
{
if ( nAvailableData % m_nBlockSize == 0 )
nToConvertLen = nAvailableData;
else if ( nAvailableData < m_nBlockSize )
nToConvertLen = 0;
else
nToConvertLen = nAvailableData - nAvailableData % m_nBlockSize;
}
else
{
// decryption with W3C padding needs at least one block for finalizing
if ( nAvailableData < m_nBlockSize * 2 )
nToConvertLen = 0;
else
nToConvertLen = nAvailableData - nAvailableData % m_nBlockSize - m_nBlockSize;
}
aToConvert.realloc( nToConvertLen );
if ( nToConvertLen == 0 )
{
m_aLastBlock.realloc( nOldLastBlockLen + aData.getLength() );
memcpy( m_aLastBlock.getArray() + nOldLastBlockLen, aData.getConstArray(), aData.getLength() );
// aToConvert stays empty
}
else if ( nToConvertLen < nOldLastBlockLen )
{
memcpy( aToConvert.getArray(), m_aLastBlock.getConstArray(), nToConvertLen );
memcpy( m_aLastBlock.getArray(), m_aLastBlock.getConstArray() + nToConvertLen, nOldLastBlockLen - nToConvertLen );
m_aLastBlock.realloc( nOldLastBlockLen - nToConvertLen + aData.getLength() );
memcpy( m_aLastBlock.getArray() + nOldLastBlockLen - nToConvertLen, aData.getConstArray(), aData.getLength() );
}
else
{
memcpy( aToConvert.getArray(), m_aLastBlock.getConstArray(), nOldLastBlockLen );
if ( nToConvertLen > nOldLastBlockLen )
memcpy( aToConvert.getArray() + nOldLastBlockLen, aData.getConstArray(), nToConvertLen - nOldLastBlockLen );
m_aLastBlock.realloc( nAvailableData - nToConvertLen );
memcpy( m_aLastBlock.getArray(), aData.getConstArray() + nToConvertLen - nOldLastBlockLen, nAvailableData - nToConvertLen );
}
}
uno::Sequence< sal_Int8 > aResult;
OSL_ENSURE( aToConvert.getLength() % m_nBlockSize == 0, "Unexpected size of the data to encrypt!" );
if ( aToConvert.hasElements() )
{
int nResultLen = 0;
aResult.realloc( aToConvert.getLength() + m_nBlockSize );
if ( PK11_CipherOp( m_pContext, reinterpret_cast< unsigned char* >( aResult.getArray() ), &nResultLen, aResult.getLength(), reinterpret_cast< const unsigned char* >( aToConvert.getConstArray() ), aToConvert.getLength() ) != SECSuccess )
{
m_bBroken = true;
Dispose();
throw uno::RuntimeException();
}
m_nConverted += aToConvert.getLength();
aResult.realloc( nResultLen );
}
return aResult;
}
uno::Sequence< ::sal_Int8 > SAL_CALL OCipherContext::finalizeCipherContextAndDispose()
{
::osl::MutexGuard aGuard( m_aMutex );
if ( m_bBroken )
throw uno::RuntimeException();
if ( m_bDisposed )
throw lang::DisposedException();
OSL_ENSURE( m_nBlockSize <= SAL_MAX_INT8, "Unexpected block size!" );
OSL_ENSURE( m_nConverted % m_nBlockSize == 0, "Unexpected amount of bytes is already converted!" );
sal_Int32 nSizeForPadding = ( m_nConverted + m_aLastBlock.getLength() ) % m_nBlockSize;
// if it is decryption, the amount of data should be rounded to the block size even in case of padding
if ( ( !m_bPadding || !m_bEncryption ) && nSizeForPadding )
throw uno::RuntimeException("The data should contain complete blocks only." );
if ( m_bW3CPadding && m_bEncryption )
{
// in this case the last block should be smaller than standard block
// it will be increased with the padding
OSL_ENSURE( m_aLastBlock.getLength() < m_nBlockSize, "Unexpected size of cashed incomplete last block!" );
// W3CPadding handling for encryption
sal_Int32 nPaddingSize = m_nBlockSize - nSizeForPadding;
sal_Int32 nOldLastBlockLen = m_aLastBlock.getLength();
m_aLastBlock.realloc( nOldLastBlockLen + nPaddingSize );
if ( nPaddingSize > 1 )
{
rtlRandomPool aRandomPool = rtl_random_createPool();
rtl_random_getBytes( aRandomPool, m_aLastBlock.getArray() + nOldLastBlockLen, nPaddingSize - 1 );
rtl_random_destroyPool ( aRandomPool );
}
m_aLastBlock[m_aLastBlock.getLength() - 1] = static_cast< sal_Int8 >( nPaddingSize );
}
// finally should the last block be smaller than two standard blocks
OSL_ENSURE( m_aLastBlock.getLength() < m_nBlockSize * 2 , "Unexpected size of cashed incomplete last block!" );
uno::Sequence< sal_Int8 > aResult;
if ( m_aLastBlock.hasElements() )
{
int nPrefResLen = 0;
aResult.realloc( m_aLastBlock.getLength() + m_nBlockSize );
if ( PK11_CipherOp( m_pContext, reinterpret_cast< unsigned char* >( aResult.getArray() ), &nPrefResLen, aResult.getLength(), reinterpret_cast< const unsigned char* >( m_aLastBlock.getConstArray() ), m_aLastBlock.getLength() ) != SECSuccess )
{
m_bBroken = true;
Dispose();
throw uno::RuntimeException();
}
aResult.realloc( nPrefResLen );
m_aLastBlock.realloc( 0 );
}
sal_Int32 nPrefixLen = aResult.getLength();
aResult.realloc( nPrefixLen + m_nBlockSize * 2 );
unsigned nFinalLen = 0;
if ( PK11_DigestFinal( m_pContext, reinterpret_cast< unsigned char* >( aResult.getArray() + nPrefixLen ), &nFinalLen, aResult.getLength() - nPrefixLen ) != SECSuccess )
{
m_bBroken = true;
Dispose();
throw uno::RuntimeException();
}
aResult.realloc( nPrefixLen + nFinalLen );
if ( m_bW3CPadding && !m_bEncryption )
{
// W3CPadding handling for decryption
// aResult should have enough data, since we let m_aLastBlock be big enough in case of decryption
OSL_ENSURE( aResult.getLength() >= m_nBlockSize, "Not enough data to handle the padding!" );
sal_Int8 nBytesToRemove = aResult[aResult.getLength() - 1];
if ( nBytesToRemove <= 0 || nBytesToRemove > aResult.getLength() )
{
m_bBroken = true;
Dispose();
throw uno::RuntimeException();
}
aResult.realloc( aResult.getLength() - nBytesToRemove );
}
Dispose();
return aResult;
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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