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/*
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* Copyright (c) 2002-2009 Nokia Corporation and/or its subsidiary(-ies).
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* All rights reserved.
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* This component and the accompanying materials are made available
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* under the terms of the License "Eclipse Public License v1.0"
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* which accompanies this distribution, and is available
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* at the URL "http://www.eclipse.org/legal/epl-v10.html".
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*
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* Initial Contributors:
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* Nokia Corporation - initial contribution.
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*
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* Contributors:
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*
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* Description:
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*
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*/
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#include "3des.h"
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#include "../common/inlines.h"
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#include "des.inl"
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#include <cryptostrength.h>
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const TInt K3DESBlockBytes = 8;
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const TInt K3DESKeyBytes = 24;
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const TInt KDESKeyBytes = 8;
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void C3DES::Transform(TDes8& aBlock)
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{
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assert(aBlock.Size() == K3DESBlockBytes);
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TUint32 l, r;
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// Split the block into 2 word-sized big endian portions
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GetBlockBigEndian((TUint8*)&aBlock[0], l, r);
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IPerm(l,r);
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DoTransform(l, r, iK1);
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DoTransform(r, l, iK2);
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DoTransform(l, r, iK3);
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FPerm(l,r);
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// Put the portions back into the block as little endian
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PutBlockBigEndian((TUint8*)&aBlock[0], r, l);
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}
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TInt C3DES::BlockSize() const
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{
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return K3DESBlockBytes;
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}
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TInt C3DES::KeySize() const
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{
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return K3DESKeyBytes;
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}
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C3DES::C3DES()
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{
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}
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void C3DES::ConstructL(const TDesC8& aKey)
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{
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assert(aKey.Size() == K3DESKeyBytes);
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iKey = aKey.AllocL();
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DoSetKey(*iKey);
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}
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void C3DES::Reset()
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{
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DoSetKey(*iKey);
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}
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/* C3DESEncryptor */
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EXPORT_C C3DESEncryptor* C3DESEncryptor::NewL(const TDesC8& aKey)
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{
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C3DESEncryptor* me = C3DESEncryptor::NewLC(aKey);
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CleanupStack::Pop(me);
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return (me);
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}
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EXPORT_C C3DESEncryptor* C3DESEncryptor::NewLC(const TDesC8& aKey)
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{
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C3DESEncryptor* me = new (ELeave) C3DESEncryptor();
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CleanupStack::PushL(me);
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me->ConstructL(aKey);
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// DES only used 7 bits out of every key byte
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TCrypto::IsSymmetricWeakEnoughL(BytesToBits(aKey.Size()) - aKey.Size());
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return (me);
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}
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void C3DESEncryptor::DoSetKey(const TDesC8& aKey)
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{
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// Encryptor key
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SetKey(aKey.Mid(0, KDESKeyBytes), iK1);
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// Decryptor key
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SetKey(aKey.Mid(KDESKeyBytes, 2*KDESKeyBytes), iK2);
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ReverseKeySchedule(iK2); // Reverse key schedule order
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// Encryptor key
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SetKey(aKey.Mid(2*KDESKeyBytes), iK3);
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}
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/* C3DESDecryptor */
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EXPORT_C C3DESDecryptor* C3DESDecryptor::NewL(const TDesC8& aKey)
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{
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C3DESDecryptor* me = C3DESDecryptor::NewLC(aKey);
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CleanupStack::Pop(me);
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return (me);
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}
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EXPORT_C C3DESDecryptor* C3DESDecryptor::NewLC(const TDesC8& aKey)
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{
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C3DESDecryptor* me = new (ELeave) C3DESDecryptor();
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CleanupStack::PushL(me);
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me->ConstructL(aKey);
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// DES only used 7 bits out of every key byte
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TCrypto::IsSymmetricWeakEnoughL(BytesToBits(aKey.Size()) - aKey.Size());
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return (me);
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}
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void C3DESDecryptor::DoSetKey(const TDesC8& aKey)
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{
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// 3DES decryption, reverse through key
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// Decryptor key
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CDES::SetKey(aKey.Mid(2*KDESKeyBytes), iK1);
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ReverseKeySchedule(iK1); // Reverse key schedule order
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// Encryptor key
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CDES::SetKey(aKey.Mid(KDESKeyBytes, 2*KDESKeyBytes), iK2);
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// Decryptor key
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CDES::SetKey(aKey.Mid(0, KDESKeyBytes), iK3);
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ReverseKeySchedule(iK3); // Reverse key schedule order
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}
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