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/*
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* Copyright (c) 2006-2009 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 "rijndaelimpl.h"
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#include "keys.h"
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#include "rijndaeltables.h"
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#include "common/inlines.h"
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#include "pluginconfig.h"
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#include "symmetriccipherimpl.h"
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#include <cryptostrength.h>
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using namespace SoftwareCrypto;
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const TUint KAESKeyBytes128 = 16;
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const TUint KAESKeyBytes192 = 24;
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const TUint KAESKeyBytes256 = 32;
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const TUint KAESBlockBytes = 16;
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/* CRijndaelmpl*/
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CRijndaelImpl::CRijndaelImpl(
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TUid aCryptoMode,
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TUid aOperationMode,
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TUid aPadding) :
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CSymmetricBlockCipherImpl(KAESBlockBytes, aCryptoMode, aOperationMode, aPadding)
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{
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}
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CRijndaelImpl* CRijndaelImpl::NewL(const CKey& aKey, TUid aCryptoMode, TUid aOperationMode, TUid aPadding)
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{
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CRijndaelImpl* self = CRijndaelImpl::NewLC(aKey, aCryptoMode, aOperationMode, aPadding);
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CleanupStack::Pop(self);
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return self;
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}
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CRijndaelImpl* CRijndaelImpl::NewLC(const CKey& aKey, TUid aCryptoMode, TUid aOperationMode, TUid aPadding)
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{
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CRijndaelImpl* self = new(ELeave) CRijndaelImpl(aCryptoMode, aOperationMode, aPadding);
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CleanupStack::PushL(self);
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self->ConstructL(aKey);
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const TDesC8& keyContent = aKey.GetTDesC8L(KSymmetricKeyParameterUid);
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TCrypto::IsSymmetricWeakEnoughL(BytesToBits(keyContent.Size()) - keyContent.Size());
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return self;
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}
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CRijndaelImpl::~CRijndaelImpl()
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{
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// make sure key information isn't visible to other processes if the
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// page is reused.
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Mem::FillZ(&iK, sizeof(iK));
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}
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void CRijndaelImpl::ConstructL(const CKey& aKey)
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{
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CSymmetricBlockCipherImpl::ConstructL(aKey);
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SetKeySchedule();
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}
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CExtendedCharacteristics* CRijndaelImpl::CreateExtendedCharacteristicsL()
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{
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// All Symbian software plug-ins have unlimited concurrency, cannot be reserved
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// for exclusive use and are not CERTIFIED to be standards compliant.
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return CExtendedCharacteristics::NewL(KMaxTInt, EFalse);
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}
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const CExtendedCharacteristics* CRijndaelImpl::GetExtendedCharacteristicsL()
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{
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return CRijndaelImpl::CreateExtendedCharacteristicsL();
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}
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TUid CRijndaelImpl::ImplementationUid() const
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{
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return KCryptoPluginAesUid;
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}
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TBool CRijndaelImpl::IsValidKeyLength(TInt aKeyBytes) const
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{
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switch(aKeyBytes)
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{
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case KAESKeyBytes128:
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case KAESKeyBytes192:
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case KAESKeyBytes256:
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return ETrue;
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default:
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return EFalse;
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}
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}
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void CRijndaelImpl::SetKeySchedule()
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{
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iRounds = iKeyBytes/4 + 6;
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if (iCryptoMode.iUid == KCryptoModeEncrypt)
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{
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SetEncryptKeySchedule(*iKey, &iK[0]);
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}
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else
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{
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ASSERT(iCryptoMode.iUid == KCryptoModeDecrypt);
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SetDecryptKeySchedule(*iKey, &iK[0]);
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}
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}
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void CRijndaelImpl::TransformEncrypt(
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TUint8* aBuffer,
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TUint aNumBlocks)
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{
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for (TInt i = 0; i < aNumBlocks; ++i)
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{
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ModeEncryptStart(aBuffer);
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TUint32 s0, s1, s2, s3, t0, t1, t2, t3;
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const TUint32* rk = &iK[0];
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/*
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* map byte array block to cipher state
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* and add initial round key:
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*/
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GetBlockBigEndian(aBuffer, s0, s1, s2, s3);
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s0 ^= rk[0];
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s1 ^= rk[1];
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s2 ^= rk[2];
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s3 ^= rk[3];
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/*
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* Nr - 1 full rounds:
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*/
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TUint r = iRounds >> 1;
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FOREVER
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{
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t0 =
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RIJNDAEL_TABLE::Te0[GETBYTE(s0, 3)] ^
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RIJNDAEL_TABLE::Te1[GETBYTE(s1, 2)] ^
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RIJNDAEL_TABLE::Te2[GETBYTE(s2, 1)] ^
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RIJNDAEL_TABLE::Te3[GETBYTE(s3, 0)] ^
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rk[4];
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t1 =
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RIJNDAEL_TABLE::Te0[GETBYTE(s1, 3)] ^
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RIJNDAEL_TABLE::Te1[GETBYTE(s2, 2)] ^
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RIJNDAEL_TABLE::Te2[GETBYTE(s3, 1)] ^
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RIJNDAEL_TABLE::Te3[GETBYTE(s0, 0)] ^
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rk[5];
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t2 =
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RIJNDAEL_TABLE::Te0[GETBYTE(s2, 3)] ^
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RIJNDAEL_TABLE::Te1[GETBYTE(s3, 2)] ^
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RIJNDAEL_TABLE::Te2[GETBYTE(s0, 1)] ^
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RIJNDAEL_TABLE::Te3[GETBYTE(s1, 0)] ^
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rk[6];
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t3 =
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RIJNDAEL_TABLE::Te0[GETBYTE(s3, 3)] ^
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RIJNDAEL_TABLE::Te1[GETBYTE(s0, 2)] ^
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RIJNDAEL_TABLE::Te2[GETBYTE(s1, 1)] ^
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RIJNDAEL_TABLE::Te3[GETBYTE(s2, 0)] ^
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rk[7];
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rk += 8;
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if (--r == 0)
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break;
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s0 =
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RIJNDAEL_TABLE::Te0[GETBYTE(t0, 3)] ^
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RIJNDAEL_TABLE::Te1[GETBYTE(t1, 2)] ^
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RIJNDAEL_TABLE::Te2[GETBYTE(t2, 1)] ^
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RIJNDAEL_TABLE::Te3[GETBYTE(t3, 0)] ^
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rk[0];
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s1 =
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RIJNDAEL_TABLE::Te0[GETBYTE(t1, 3)] ^
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RIJNDAEL_TABLE::Te1[GETBYTE(t2, 2)] ^
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RIJNDAEL_TABLE::Te2[GETBYTE(t3, 1)] ^
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RIJNDAEL_TABLE::Te3[GETBYTE(t0, 0)] ^
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rk[1];
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s2 =
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RIJNDAEL_TABLE::Te0[GETBYTE(t2, 3)] ^
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RIJNDAEL_TABLE::Te1[GETBYTE(t3, 2)] ^
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RIJNDAEL_TABLE::Te2[GETBYTE(t0, 1)] ^
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RIJNDAEL_TABLE::Te3[GETBYTE(t1, 0)] ^
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rk[2];
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s3 =
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RIJNDAEL_TABLE::Te0[GETBYTE(t3, 3)] ^
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RIJNDAEL_TABLE::Te1[GETBYTE(t0, 2)] ^
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RIJNDAEL_TABLE::Te2[GETBYTE(t1, 1)] ^
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RIJNDAEL_TABLE::Te3[GETBYTE(t2, 0)] ^
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rk[3];
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}
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/*
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* apply last round and
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* map cipher state to byte array block:
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*/
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s0 =
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(RIJNDAEL_TABLE::Te4[GETBYTE(t0, 3)] & 0xff000000) ^
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(RIJNDAEL_TABLE::Te4[GETBYTE(t1, 2)] & 0x00ff0000) ^
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(RIJNDAEL_TABLE::Te4[GETBYTE(t2, 1)] & 0x0000ff00) ^
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(RIJNDAEL_TABLE::Te4[GETBYTE(t3, 0)] & 0x000000ff) ^
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rk[0];
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s1 =
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(RIJNDAEL_TABLE::Te4[GETBYTE(t1, 3)] & 0xff000000) ^
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(RIJNDAEL_TABLE::Te4[GETBYTE(t2, 2)] & 0x00ff0000) ^
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(RIJNDAEL_TABLE::Te4[GETBYTE(t3, 1)] & 0x0000ff00) ^
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(RIJNDAEL_TABLE::Te4[GETBYTE(t0, 0)] & 0x000000ff) ^
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rk[1];
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s2 =
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(RIJNDAEL_TABLE::Te4[GETBYTE(t2, 3)] & 0xff000000) ^
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(RIJNDAEL_TABLE::Te4[GETBYTE(t3, 2)] & 0x00ff0000) ^
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(RIJNDAEL_TABLE::Te4[GETBYTE(t0, 1)] & 0x0000ff00) ^
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(RIJNDAEL_TABLE::Te4[GETBYTE(t1, 0)] & 0x000000ff) ^
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rk[2];
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s3 =
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(RIJNDAEL_TABLE::Te4[GETBYTE(t3, 3)] & 0xff000000) ^
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(RIJNDAEL_TABLE::Te4[GETBYTE(t0, 2)] & 0x00ff0000) ^
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(RIJNDAEL_TABLE::Te4[GETBYTE(t1, 1)] & 0x0000ff00) ^
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(RIJNDAEL_TABLE::Te4[GETBYTE(t2, 0)] & 0x000000ff) ^
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rk[3];
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PutBlockBigEndian(aBuffer, s0, s1, s2, s3);
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ModeEncryptEnd(aBuffer);
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aBuffer += KAESBlockBytes;
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}
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}
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void CRijndaelImpl::TransformDecrypt(
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TUint8* aBuffer,
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TUint aNumBlocks)
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{
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for (TInt i = 0; i < aNumBlocks; ++i)
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{
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ModeDecryptStart(aBuffer);
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TUint32 s0, s1, s2, s3, t0, t1, t2, t3;
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const TUint32* rk = &iK[0];
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/*
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* map byte array block to cipher state
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* and add initial round key:
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*/
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GetBlockBigEndian(aBuffer, s0, s1, s2, s3);
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s0 ^= rk[0];
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s1 ^= rk[1];
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s2 ^= rk[2];
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s3 ^= rk[3];
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sl@0
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/*
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* Nr - 1 full rounds:
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*/
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TUint r = iRounds >> 1;
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FOREVER
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{
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t0 =
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RIJNDAEL_TABLE::Td0[GETBYTE(s0, 3)] ^
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RIJNDAEL_TABLE::Td1[GETBYTE(s3, 2)] ^
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RIJNDAEL_TABLE::Td2[GETBYTE(s2, 1)] ^
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RIJNDAEL_TABLE::Td3[GETBYTE(s1, 0)] ^
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rk[4];
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t1 =
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RIJNDAEL_TABLE::Td0[GETBYTE(s1, 3)] ^
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RIJNDAEL_TABLE::Td1[GETBYTE(s0, 2)] ^
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RIJNDAEL_TABLE::Td2[GETBYTE(s3, 1)] ^
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RIJNDAEL_TABLE::Td3[GETBYTE(s2, 0)] ^
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rk[5];
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t2 =
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RIJNDAEL_TABLE::Td0[GETBYTE(s2, 3)] ^
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RIJNDAEL_TABLE::Td1[GETBYTE(s1, 2)] ^
|
|
sl@0
|
277 |
RIJNDAEL_TABLE::Td2[GETBYTE(s0, 1)] ^
|
|
sl@0
|
278 |
RIJNDAEL_TABLE::Td3[GETBYTE(s3, 0)] ^
|
|
sl@0
|
279 |
rk[6];
|
|
sl@0
|
280 |
t3 =
|
|
sl@0
|
281 |
RIJNDAEL_TABLE::Td0[GETBYTE(s3, 3)] ^
|
|
sl@0
|
282 |
RIJNDAEL_TABLE::Td1[GETBYTE(s2, 2)] ^
|
|
sl@0
|
283 |
RIJNDAEL_TABLE::Td2[GETBYTE(s1, 1)] ^
|
|
sl@0
|
284 |
RIJNDAEL_TABLE::Td3[GETBYTE(s0, 0)] ^
|
|
sl@0
|
285 |
rk[7];
|
|
sl@0
|
286 |
|
|
sl@0
|
287 |
rk += 8;
|
|
sl@0
|
288 |
if (--r == 0)
|
|
sl@0
|
289 |
break;
|
|
sl@0
|
290 |
|
|
sl@0
|
291 |
s0 =
|
|
sl@0
|
292 |
RIJNDAEL_TABLE::Td0[GETBYTE(t0, 3)] ^
|
|
sl@0
|
293 |
RIJNDAEL_TABLE::Td1[GETBYTE(t3, 2)] ^
|
|
sl@0
|
294 |
RIJNDAEL_TABLE::Td2[GETBYTE(t2, 1)] ^
|
|
sl@0
|
295 |
RIJNDAEL_TABLE::Td3[GETBYTE(t1, 0)] ^
|
|
sl@0
|
296 |
rk[0];
|
|
sl@0
|
297 |
s1 =
|
|
sl@0
|
298 |
RIJNDAEL_TABLE::Td0[GETBYTE(t1, 3)] ^
|
|
sl@0
|
299 |
RIJNDAEL_TABLE::Td1[GETBYTE(t0, 2)] ^
|
|
sl@0
|
300 |
RIJNDAEL_TABLE::Td2[GETBYTE(t3, 1)] ^
|
|
sl@0
|
301 |
RIJNDAEL_TABLE::Td3[GETBYTE(t2, 0)] ^
|
|
sl@0
|
302 |
rk[1];
|
|
sl@0
|
303 |
s2 =
|
|
sl@0
|
304 |
RIJNDAEL_TABLE::Td0[GETBYTE(t2, 3)] ^
|
|
sl@0
|
305 |
RIJNDAEL_TABLE::Td1[GETBYTE(t1, 2)] ^
|
|
sl@0
|
306 |
RIJNDAEL_TABLE::Td2[GETBYTE(t0, 1)] ^
|
|
sl@0
|
307 |
RIJNDAEL_TABLE::Td3[GETBYTE(t3, 0)] ^
|
|
sl@0
|
308 |
rk[2];
|
|
sl@0
|
309 |
s3 =
|
|
sl@0
|
310 |
RIJNDAEL_TABLE::Td0[GETBYTE(t3, 3)] ^
|
|
sl@0
|
311 |
RIJNDAEL_TABLE::Td1[GETBYTE(t2, 2)] ^
|
|
sl@0
|
312 |
RIJNDAEL_TABLE::Td2[GETBYTE(t1, 1)] ^
|
|
sl@0
|
313 |
RIJNDAEL_TABLE::Td3[GETBYTE(t0, 0)] ^
|
|
sl@0
|
314 |
rk[3];
|
|
sl@0
|
315 |
}
|
|
sl@0
|
316 |
/*
|
|
sl@0
|
317 |
* apply last round and
|
|
sl@0
|
318 |
* map cipher state to byte array block:
|
|
sl@0
|
319 |
*/
|
|
sl@0
|
320 |
s0 =
|
|
sl@0
|
321 |
(RIJNDAEL_TABLE::Td4[GETBYTE(t0, 3)] & 0xff000000) ^
|
|
sl@0
|
322 |
(RIJNDAEL_TABLE::Td4[GETBYTE(t3, 2)] & 0x00ff0000) ^
|
|
sl@0
|
323 |
(RIJNDAEL_TABLE::Td4[GETBYTE(t2, 1)] & 0x0000ff00) ^
|
|
sl@0
|
324 |
(RIJNDAEL_TABLE::Td4[GETBYTE(t1, 0)] & 0x000000ff) ^
|
|
sl@0
|
325 |
rk[0];
|
|
sl@0
|
326 |
s1 =
|
|
sl@0
|
327 |
(RIJNDAEL_TABLE::Td4[GETBYTE(t1, 3)] & 0xff000000) ^
|
|
sl@0
|
328 |
(RIJNDAEL_TABLE::Td4[GETBYTE(t0, 2)] & 0x00ff0000) ^
|
|
sl@0
|
329 |
(RIJNDAEL_TABLE::Td4[GETBYTE(t3, 1)] & 0x0000ff00) ^
|
|
sl@0
|
330 |
(RIJNDAEL_TABLE::Td4[GETBYTE(t2, 0)] & 0x000000ff) ^
|
|
sl@0
|
331 |
rk[1];
|
|
sl@0
|
332 |
s2 =
|
|
sl@0
|
333 |
(RIJNDAEL_TABLE::Td4[GETBYTE(t2, 3)] & 0xff000000) ^
|
|
sl@0
|
334 |
(RIJNDAEL_TABLE::Td4[GETBYTE(t1, 2)] & 0x00ff0000) ^
|
|
sl@0
|
335 |
(RIJNDAEL_TABLE::Td4[GETBYTE(t0, 1)] & 0x0000ff00) ^
|
|
sl@0
|
336 |
(RIJNDAEL_TABLE::Td4[GETBYTE(t3, 0)] & 0x000000ff) ^
|
|
sl@0
|
337 |
rk[2];
|
|
sl@0
|
338 |
s3 =
|
|
sl@0
|
339 |
(RIJNDAEL_TABLE::Td4[GETBYTE(t3, 3)] & 0xff000000) ^
|
|
sl@0
|
340 |
(RIJNDAEL_TABLE::Td4[GETBYTE(t2, 2)] & 0x00ff0000) ^
|
|
sl@0
|
341 |
(RIJNDAEL_TABLE::Td4[GETBYTE(t1, 1)] & 0x0000ff00) ^
|
|
sl@0
|
342 |
(RIJNDAEL_TABLE::Td4[GETBYTE(t0, 0)] & 0x000000ff) ^
|
|
sl@0
|
343 |
rk[3];
|
|
sl@0
|
344 |
PutBlockBigEndian(aBuffer, s0, s1, s2, s3);
|
|
sl@0
|
345 |
ModeDecryptEnd(aBuffer);
|
|
sl@0
|
346 |
aBuffer += KAESBlockBytes;
|
|
sl@0
|
347 |
}
|
|
sl@0
|
348 |
}
|
|
sl@0
|
349 |
|
|
sl@0
|
350 |
void CRijndaelImpl::SetEncryptKeySchedule(const TDesC8& aKey, TUint32* aKeySchedule)
|
|
sl@0
|
351 |
{
|
|
sl@0
|
352 |
TUint keySize = aKey.Length();
|
|
sl@0
|
353 |
TUint32 temp;
|
|
sl@0
|
354 |
TUint32* rk = aKeySchedule;
|
|
sl@0
|
355 |
|
|
sl@0
|
356 |
TUint i = 0;
|
|
sl@0
|
357 |
|
|
sl@0
|
358 |
GetUserKeyBigEndian(rk, keySize/4, &aKey[0], keySize);
|
|
sl@0
|
359 |
|
|
sl@0
|
360 |
switch(keySize)
|
|
sl@0
|
361 |
{
|
|
sl@0
|
362 |
case (KAESKeyBytes128):
|
|
sl@0
|
363 |
{
|
|
sl@0
|
364 |
FOREVER
|
|
sl@0
|
365 |
{
|
|
sl@0
|
366 |
temp = rk[3];
|
|
sl@0
|
367 |
rk[4] = rk[0] ^
|
|
sl@0
|
368 |
(RIJNDAEL_TABLE::Te4[GETBYTE(temp, 2)] & 0xff000000) ^
|
|
sl@0
|
369 |
(RIJNDAEL_TABLE::Te4[GETBYTE(temp, 1)] & 0x00ff0000) ^
|
|
sl@0
|
370 |
(RIJNDAEL_TABLE::Te4[GETBYTE(temp, 0)] & 0x0000ff00) ^
|
|
sl@0
|
371 |
(RIJNDAEL_TABLE::Te4[GETBYTE(temp, 3)] & 0x000000ff) ^
|
|
sl@0
|
372 |
RIJNDAEL_TABLE::rcon[i];
|
|
sl@0
|
373 |
rk[5] = rk[1] ^ rk[4];
|
|
sl@0
|
374 |
rk[6] = rk[2] ^ rk[5];
|
|
sl@0
|
375 |
rk[7] = rk[3] ^ rk[6];
|
|
sl@0
|
376 |
if (++i == 10)
|
|
sl@0
|
377 |
break;
|
|
sl@0
|
378 |
rk += 4;
|
|
sl@0
|
379 |
}
|
|
sl@0
|
380 |
}
|
|
sl@0
|
381 |
break;
|
|
sl@0
|
382 |
|
|
sl@0
|
383 |
case (KAESKeyBytes192):
|
|
sl@0
|
384 |
{
|
|
sl@0
|
385 |
FOREVER
|
|
sl@0
|
386 |
{
|
|
sl@0
|
387 |
temp = rk[ 5];
|
|
sl@0
|
388 |
rk[ 6] = rk[ 0] ^
|
|
sl@0
|
389 |
(RIJNDAEL_TABLE::Te4[GETBYTE(temp, 2)] & 0xff000000) ^
|
|
sl@0
|
390 |
(RIJNDAEL_TABLE::Te4[GETBYTE(temp, 1)] & 0x00ff0000) ^
|
|
sl@0
|
391 |
(RIJNDAEL_TABLE::Te4[GETBYTE(temp, 0)] & 0x0000ff00) ^
|
|
sl@0
|
392 |
(RIJNDAEL_TABLE::Te4[GETBYTE(temp, 3)] & 0x000000ff) ^
|
|
sl@0
|
393 |
RIJNDAEL_TABLE::rcon[i];
|
|
sl@0
|
394 |
rk[ 7] = rk[ 1] ^ rk[ 6];
|
|
sl@0
|
395 |
rk[ 8] = rk[ 2] ^ rk[ 7];
|
|
sl@0
|
396 |
rk[ 9] = rk[ 3] ^ rk[ 8];
|
|
sl@0
|
397 |
if (++i == 8)
|
|
sl@0
|
398 |
break;
|
|
sl@0
|
399 |
rk[10] = rk[ 4] ^ rk[ 9];
|
|
sl@0
|
400 |
rk[11] = rk[ 5] ^ rk[10];
|
|
sl@0
|
401 |
rk += 6;
|
|
sl@0
|
402 |
}
|
|
sl@0
|
403 |
}
|
|
sl@0
|
404 |
break;
|
|
sl@0
|
405 |
|
|
sl@0
|
406 |
case (KAESKeyBytes256):
|
|
sl@0
|
407 |
{
|
|
sl@0
|
408 |
FOREVER
|
|
sl@0
|
409 |
{
|
|
sl@0
|
410 |
temp = rk[ 7];
|
|
sl@0
|
411 |
rk[ 8] = rk[ 0] ^
|
|
sl@0
|
412 |
(RIJNDAEL_TABLE::Te4[GETBYTE(temp, 2)] & 0xff000000) ^
|
|
sl@0
|
413 |
(RIJNDAEL_TABLE::Te4[GETBYTE(temp, 1)] & 0x00ff0000) ^
|
|
sl@0
|
414 |
(RIJNDAEL_TABLE::Te4[GETBYTE(temp, 0)] & 0x0000ff00) ^
|
|
sl@0
|
415 |
(RIJNDAEL_TABLE::Te4[GETBYTE(temp, 3)] & 0x000000ff) ^
|
|
sl@0
|
416 |
RIJNDAEL_TABLE::rcon[i];
|
|
sl@0
|
417 |
rk[ 9] = rk[ 1] ^ rk[ 8];
|
|
sl@0
|
418 |
rk[10] = rk[ 2] ^ rk[ 9];
|
|
sl@0
|
419 |
rk[11] = rk[ 3] ^ rk[10];
|
|
sl@0
|
420 |
if (++i == 7)
|
|
sl@0
|
421 |
break;
|
|
sl@0
|
422 |
temp = rk[11];
|
|
sl@0
|
423 |
rk[12] = rk[ 4] ^
|
|
sl@0
|
424 |
(RIJNDAEL_TABLE::Te4[GETBYTE(temp, 3)] & 0xff000000) ^
|
|
sl@0
|
425 |
(RIJNDAEL_TABLE::Te4[GETBYTE(temp, 2)] & 0x00ff0000) ^
|
|
sl@0
|
426 |
(RIJNDAEL_TABLE::Te4[GETBYTE(temp, 1)] & 0x0000ff00) ^
|
|
sl@0
|
427 |
(RIJNDAEL_TABLE::Te4[GETBYTE(temp, 0)] & 0x000000ff);
|
|
sl@0
|
428 |
rk[13] = rk[ 5] ^ rk[12];
|
|
sl@0
|
429 |
rk[14] = rk[ 6] ^ rk[13];
|
|
sl@0
|
430 |
rk[15] = rk[ 7] ^ rk[14];
|
|
sl@0
|
431 |
|
|
sl@0
|
432 |
rk += 8;
|
|
sl@0
|
433 |
}
|
|
sl@0
|
434 |
}
|
|
sl@0
|
435 |
break;
|
|
sl@0
|
436 |
|
|
sl@0
|
437 |
default:
|
|
sl@0
|
438 |
assert(0); // Shouldn't get here, keeps compiler happy
|
|
sl@0
|
439 |
}
|
|
sl@0
|
440 |
}
|
|
sl@0
|
441 |
|
|
sl@0
|
442 |
void CRijndaelImpl::SetDecryptKeySchedule(const TDesC8& aKey, TUint32* aKeySchedule)
|
|
sl@0
|
443 |
{
|
|
sl@0
|
444 |
SetEncryptKeySchedule(aKey, aKeySchedule);
|
|
sl@0
|
445 |
|
|
sl@0
|
446 |
TUint i, j;
|
|
sl@0
|
447 |
TUint32* rk = aKeySchedule;
|
|
sl@0
|
448 |
TUint32 temp;
|
|
sl@0
|
449 |
|
|
sl@0
|
450 |
// invert the order of the round keys
|
|
sl@0
|
451 |
for (i = 0, j = 4*iRounds; i < j; i += 4, j -= 4)
|
|
sl@0
|
452 |
{
|
|
sl@0
|
453 |
temp = rk[i ]; rk[i ] = rk[j ]; rk[j ] = temp;
|
|
sl@0
|
454 |
temp = rk[i + 1]; rk[i + 1] = rk[j + 1]; rk[j + 1] = temp;
|
|
sl@0
|
455 |
temp = rk[i + 2]; rk[i + 2] = rk[j + 2]; rk[j + 2] = temp;
|
|
sl@0
|
456 |
temp = rk[i + 3]; rk[i + 3] = rk[j + 3]; rk[j + 3] = temp;
|
|
sl@0
|
457 |
}
|
|
sl@0
|
458 |
|
|
sl@0
|
459 |
// apply the inverse MixColumn transform to all round keys but the first and the last
|
|
sl@0
|
460 |
for (i = 1; i < iRounds; i++)
|
|
sl@0
|
461 |
{
|
|
sl@0
|
462 |
rk += 4;
|
|
sl@0
|
463 |
rk[0] =
|
|
sl@0
|
464 |
RIJNDAEL_TABLE::Td0[RIJNDAEL_TABLE::Te4[GETBYTE(rk[0], 3)] & 0xff] ^
|
|
sl@0
|
465 |
RIJNDAEL_TABLE::Td1[RIJNDAEL_TABLE::Te4[GETBYTE(rk[0], 2)] & 0xff] ^
|
|
sl@0
|
466 |
RIJNDAEL_TABLE::Td2[RIJNDAEL_TABLE::Te4[GETBYTE(rk[0], 1)] & 0xff] ^
|
|
sl@0
|
467 |
RIJNDAEL_TABLE::Td3[RIJNDAEL_TABLE::Te4[GETBYTE(rk[0], 0)] & 0xff];
|
|
sl@0
|
468 |
rk[1] =
|
|
sl@0
|
469 |
RIJNDAEL_TABLE::Td0[RIJNDAEL_TABLE::Te4[GETBYTE(rk[1], 3)] & 0xff] ^
|
|
sl@0
|
470 |
RIJNDAEL_TABLE::Td1[RIJNDAEL_TABLE::Te4[GETBYTE(rk[1], 2)] & 0xff] ^
|
|
sl@0
|
471 |
RIJNDAEL_TABLE::Td2[RIJNDAEL_TABLE::Te4[GETBYTE(rk[1], 1)] & 0xff] ^
|
|
sl@0
|
472 |
RIJNDAEL_TABLE::Td3[RIJNDAEL_TABLE::Te4[GETBYTE(rk[1], 0)] & 0xff];
|
|
sl@0
|
473 |
rk[2] =
|
|
sl@0
|
474 |
RIJNDAEL_TABLE::Td0[RIJNDAEL_TABLE::Te4[GETBYTE(rk[2], 3)] & 0xff] ^
|
|
sl@0
|
475 |
RIJNDAEL_TABLE::Td1[RIJNDAEL_TABLE::Te4[GETBYTE(rk[2], 2)] & 0xff] ^
|
|
sl@0
|
476 |
RIJNDAEL_TABLE::Td2[RIJNDAEL_TABLE::Te4[GETBYTE(rk[2], 1)] & 0xff] ^
|
|
sl@0
|
477 |
RIJNDAEL_TABLE::Td3[RIJNDAEL_TABLE::Te4[GETBYTE(rk[2], 0)] & 0xff];
|
|
sl@0
|
478 |
rk[3] =
|
|
sl@0
|
479 |
RIJNDAEL_TABLE::Td0[RIJNDAEL_TABLE::Te4[GETBYTE(rk[3], 3)] & 0xff] ^
|
|
sl@0
|
480 |
RIJNDAEL_TABLE::Td1[RIJNDAEL_TABLE::Te4[GETBYTE(rk[3], 2)] & 0xff] ^
|
|
sl@0
|
481 |
RIJNDAEL_TABLE::Td2[RIJNDAEL_TABLE::Te4[GETBYTE(rk[3], 1)] & 0xff] ^
|
|
sl@0
|
482 |
RIJNDAEL_TABLE::Td3[RIJNDAEL_TABLE::Te4[GETBYTE(rk[3], 0)] & 0xff];
|
|
sl@0
|
483 |
}
|
|
sl@0
|
484 |
}
|