/* -*- 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 <rtl/cipher.h>

#include <rtl/ref.hxx>

#include "blowfishcontext.hxx"

using namespace ::com::sun::star;

// static

uno::Reference< xml::crypto::XCipherContext > BlowfishCFB8CipherContext::Create( const uno::Sequence< sal_Int8 >& aDerivedKey, const uno::Sequence< sal_Int8 >& aInitVector, bool bEncrypt )

{

    ::rtl::Reference< BlowfishCFB8CipherContext > xResult = new BlowfishCFB8CipherContext();

    xResult->m_pCipher = rtl_cipher_create( rtl_Cipher_AlgorithmBF, rtl_Cipher_ModeStream );

    if ( !xResult->m_pCipher )

        throw uno::RuntimeException(u"Can not create cipher!"_ustr );

    if ( rtl_Cipher_E_None != rtl_cipher_init(

                                xResult->m_pCipher,

                                bEncrypt ? rtl_Cipher_DirectionEncode : rtl_Cipher_DirectionDecode,

                                reinterpret_cast< const sal_uInt8* >( aDerivedKey.getConstArray() ),

                                aDerivedKey.getLength(),

                                reinterpret_cast< const sal_uInt8* >( aInitVector.getConstArray() ),

                                aInitVector.getLength() ) )

    {

        throw uno::RuntimeException(u"Can not initialize cipher!"_ustr );

    }

    xResult->m_bEncrypt = bEncrypt;

    return xResult;

}

BlowfishCFB8CipherContext::~BlowfishCFB8CipherContext()

{

    if ( m_pCipher )

    {

        rtl_cipher_destroy ( m_pCipher );

        m_pCipher = nullptr;

    }

}

uno::Sequence< sal_Int8 > SAL_CALL BlowfishCFB8CipherContext::convertWithCipherContext( const uno::Sequence< ::sal_Int8 >& aData )

{

    std::scoped_lock aGuard( m_aMutex );

    if ( !m_pCipher )

        throw lang::DisposedException();

    uno::Sequence< sal_Int8 > aResult( aData.getLength() );

    rtlCipherError nError = rtl_Cipher_E_None;

    if ( m_bEncrypt )

    {

        nError = rtl_cipher_encode( m_pCipher,

                          aData.getConstArray(),

                          aData.getLength(),

                          reinterpret_cast< sal_uInt8* >( aResult.getArray() ),

                          aResult.getLength() );

    }

    else

    {

        nError = rtl_cipher_decode( m_pCipher,

                          aData.getConstArray(),

                          aData.getLength(),

                          reinterpret_cast< sal_uInt8* >( aResult.getArray() ),

                          aResult.getLength() );

    }

    if ( rtl_Cipher_E_None != nError )

    {

        throw uno::RuntimeException(u"Can not decrypt/encrypt with cipher!"_ustr );

    }

    return aResult;

}

uno::Sequence< ::sal_Int8 > SAL_CALL BlowfishCFB8CipherContext::finalizeCipherContextAndDispose()

{

    std::scoped_lock aGuard( m_aMutex );

    if ( !m_pCipher )

        throw lang::DisposedException();

    rtl_cipher_destroy ( m_pCipher );

    m_pCipher = nullptr;

    return uno::Sequence< sal_Int8 >();

}

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