diff -r 641f389e9157 -r a71299154b21 crypto/weakcrypto/source/symmetric/rc2.cpp --- a/crypto/weakcrypto/source/symmetric/rc2.cpp Tue Aug 31 17:00:08 2010 +0300 +++ /dev/null Thu Jan 01 00:00:00 1970 +0000 @@ -1,199 +0,0 @@ -/* -* Copyright (c) 2002-2009 Nokia Corporation and/or its subsidiary(-ies). -* All rights reserved. -* This component and the accompanying materials are made available -* under the terms of the License "Eclipse Public License v1.0" -* which accompanies this distribution, and is available -* at the URL "http://www.eclipse.org/legal/epl-v10.html". -* -* Initial Contributors: -* Nokia Corporation - initial contribution. -* -* Contributors: -* -* Description: -* -*/ - - -#include "rc2.h" -#include "rc2table.h" -#include "../common/inlines.h" -#include - -const TInt KRC2BlockBytes = 8; - -/* CRC2Encryptor */ - -void CRC2::SetKey(const TDesC8& aKey, TInt aEffectiveKeyLenBits) - { - TUint keyLen = (TUint)aKey.Size(); - - iKey.Copy(aKey); - iEffectiveKeyLenBits = aEffectiveKeyLenBits; - - TUint8 L[KRC2MaxKeySizeBytes]; - Mem::Copy((TUint8*)&L[0], (TUint8*)&aKey[0], keyLen); - - TInt maxKeySizeBytes = (TInt)KRC2MaxKeySizeBytes; - TInt expandedKeyLen = (TInt)KRC2ExpandedKeyLen; - TInt i = keyLen; - for (; i < maxKeySizeBytes; i++) - { - L[i] = RC2_TABLE::PITABLE[(L[i-1] + L[i-keyLen]) & 255]; - } - - TUint T8 = (aEffectiveKeyLenBits+7) / 8; - TUint8 TM = (TUint8)(255 >> ((8-(iEffectiveKeyLenBits%8))%8)); - L[128-T8] = RC2_TABLE::PITABLE[L[128-T8] & TM]; - - for (i=127-T8; i>=0; i--) - L[i] = RC2_TABLE::PITABLE[L[i+1] ^ L[i+T8]]; - - for (i=0; i < expandedKeyLen; i++) - iK[i] = (TUint16)(L[2*i] + (L[2*i+1] << 8)); - } - -void CRC2::Reset() - { - SetKey(iKey, iEffectiveKeyLenBits); - } - -TInt CRC2::BlockSize() const - { - return KRC2BlockBytes; - } - -TInt CRC2::KeySize() const - { - return iKey.Size(); - } - -CRC2::CRC2(void) - { - } - -/* CRC2Encryptor */ - -EXPORT_C CRC2Encryptor* CRC2Encryptor::NewL(const TDesC8& aKey, - TInt aEffectiveKeyLenBits) - { - CRC2Encryptor* me = CRC2Encryptor::NewLC(aKey, aEffectiveKeyLenBits); - CleanupStack::Pop(me); - return (me); - } - -EXPORT_C CRC2Encryptor* CRC2Encryptor::NewLC(const TDesC8& aKey, - TInt aEffectiveKeyLenBits) - { - CRC2Encryptor* me = new (ELeave) CRC2Encryptor; - CleanupStack::PushL(me); // Does not leave but function requires it be Push-ed - me->SetKey(aKey, aEffectiveKeyLenBits); - // weak enough if either aKey or aEffectiveKeyLenBits is weak - TInt minKeySize = Min(aEffectiveKeyLenBits, BytesToBits(aKey.Size())); - TCrypto::IsSymmetricWeakEnoughL(minKeySize); - return (me); - } - -#pragma warning (disable : 4244) // conversion from 'int' to 'unsigned short', possible loss of data -void CRC2Encryptor::Transform(TDes8& aBlock) - { - assert(aBlock.Size() == KRC2BlockBytes); - - TUint16 R0, R1, R2, R3; - GetBlockLittleEndian((TUint8*)&aBlock[0], R0, R1, R2, R3); - - TInt i = 0; - for (; i < 16; i++) - { - R0 += (R1 & ~R3) + (R2 & R3) + iK[4*i+0]; - R0 = rotlFixed(R0, 1); - - R1 += (R2 & ~R0) + (R3 & R0) + iK[4*i+1]; - R1 = rotlFixed(R1, 2); - - R2 += (R3 & ~R1) + (R0 & R1) + iK[4*i+2]; - R2 = rotlFixed(R2, 3); - - R3 += (R0 & ~R2) + (R1 & R2) + iK[4*i+3]; - R3 = rotlFixed(R3, 5); - - if (i == 4 || i == 10) - { - R0 += iK[R3 & 63]; - R1 += iK[R0 & 63]; - R2 += iK[R1 & 63]; - R3 += iK[R2 & 63]; - } - } - - PutBlockLittleEndian((TUint8*)&aBlock[0], R0, R1, R2, R3); - } -#pragma warning (default : 4244) // conversion from 'int' to 'unsigned short', possible loss of data - -CRC2Encryptor::CRC2Encryptor(void) - { - } - -/* CRC2Decryptor */ - -EXPORT_C CRC2Decryptor* CRC2Decryptor::NewL(const TDesC8& aKey, - TInt aEffectiveKeyLenBits) - { - CRC2Decryptor* me = CRC2Decryptor::NewLC(aKey, aEffectiveKeyLenBits); - CleanupStack::Pop(me); - return (me); - } - -EXPORT_C CRC2Decryptor* CRC2Decryptor::NewLC(const TDesC8& aKey, - TInt aEffectiveKeyLenBits) - { - CRC2Decryptor* me = new (ELeave) CRC2Decryptor; - CleanupStack::PushL(me); // Does not leave but function requires it be Push-ed - me->SetKey(aKey, aEffectiveKeyLenBits); - // weak enough if either aKey or aEffectiveKeyLenBits is weak - TInt minKeySize = Min(aEffectiveKeyLenBits, BytesToBits(aKey.Size())); - TCrypto::IsSymmetricWeakEnoughL(minKeySize); - return (me); - } - -#pragma warning (disable : 4244) // conversion from 'int' to 'unsigned short', possible loss of data -void CRC2Decryptor::Transform(TDes8& aBlock) - { - assert(aBlock.Size() == KRC2BlockBytes); - - TUint16 R0, R1, R2, R3; - GetBlockLittleEndian((TUint8*)&aBlock[0], R0, R1, R2, R3); - - TInt i = 15; - for (; i >= 0; i--) - { - if (i == 4 || i == 10) - { - R3 -= iK[R2 & 63]; - R2 -= iK[R1 & 63]; - R1 -= iK[R0 & 63]; - R0 -= iK[R3 & 63]; - } - - R3 = rotrFixed(R3, 5); - R3 -= (R0 & ~R2) + (R1 & R2) + iK[4*i+3]; - - R2 = rotrFixed(R2, 3); - R2 -= (R3 & ~R1) + (R0 & R1) + iK[4*i+2]; - - R1 = rotrFixed(R1, 2); - R1 -= (R2 & ~R0) + (R3 & R0) + iK[4*i+1]; - - R0 = rotrFixed(R0, 1); - R0 -= (R1 & ~R3) + (R2 & R3) + iK[4*i+0]; - } - - PutBlockLittleEndian((TUint8*)&aBlock[0], R0, R1, R2, R3); - } - -#pragma warning (default : 4244) // conversion from 'int' to 'unsigned short', possible loss of data - -CRC2Decryptor::CRC2Decryptor(void) - { - }