1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/os/security/cryptoplugins/cryptospiplugins/source/softwarecrypto/3desimpl.cpp Fri Jun 15 03:10:57 2012 +0200
1.3 @@ -0,0 +1,190 @@
1.4 +/*
1.5 +* Copyright (c) 2006-2009 Nokia Corporation and/or its subsidiary(-ies).
1.6 +* All rights reserved.
1.7 +* This component and the accompanying materials are made available
1.8 +* under the terms of the License "Eclipse Public License v1.0"
1.9 +* which accompanies this distribution, and is available
1.10 +* at the URL "http://www.eclipse.org/legal/epl-v10.html".
1.11 +*
1.12 +* Initial Contributors:
1.13 +* Nokia Corporation - initial contribution.
1.14 +*
1.15 +* Contributors:
1.16 +*
1.17 +* Description:
1.18 +*
1.19 +*/
1.20 +
1.21 +
1.22 +#include "3desimpl.h"
1.23 +
1.24 +#include "destables.h"
1.25 +#include "common/inlines.h"
1.26 +#include "des.inl"
1.27 +#include "pluginconfig.h"
1.28 +#include "symmetriccipherimpl.h"
1.29 +#include <cryptostrength.h>
1.30 +
1.31 +using namespace SoftwareCrypto;
1.32 +
1.33 +/* C3DesImpl */
1.34 +C3DesImpl::C3DesImpl(
1.35 + TUid aCryptoMode,
1.36 + TUid aOperationMode,
1.37 + TUid aPadding) :
1.38 + CDesImpl(KDesBlockBytes, aCryptoMode, aOperationMode, aPadding)
1.39 + {
1.40 + }
1.41 +
1.42 +C3DesImpl* C3DesImpl::NewL(const CKey& aKey, TUid aCryptoMode, TUid aOperationMode, TUid aPadding)
1.43 + {
1.44 + C3DesImpl* self = C3DesImpl::NewLC(aKey, aCryptoMode, aOperationMode, aPadding);
1.45 + CleanupStack::Pop(self);
1.46 + return self;
1.47 + }
1.48 +
1.49 +C3DesImpl* C3DesImpl::NewLC(const CKey& aKey, TUid aCryptoMode, TUid aOperationMode, TUid aPadding)
1.50 + {
1.51 + C3DesImpl* self = new(ELeave) C3DesImpl(aCryptoMode, aOperationMode, aPadding);
1.52 + CleanupStack::PushL(self);
1.53 + self->ConstructL(aKey);
1.54 +
1.55 + const TDesC8& keyContent = aKey.GetTDesC8L(KSymmetricKeyParameterUid);
1.56 + TCrypto::IsSymmetricWeakEnoughL(BytesToBits(keyContent.Size()) - keyContent.Size());
1.57 + return self;
1.58 + }
1.59 +
1.60 +C3DesImpl::~C3DesImpl()
1.61 + {
1.62 + // make sure key information isn't visible to other processes if the
1.63 + // page is reused.
1.64 + Mem::FillZ(&iK1, sizeof(iK1));
1.65 + Mem::FillZ(&iK2, sizeof(iK2));
1.66 + Mem::FillZ(&iK3, sizeof(iK3));
1.67 + }
1.68 +
1.69 +void C3DesImpl::ConstructL(const CKey& aKey)
1.70 + {
1.71 + CDesImpl::ConstructL(aKey);
1.72 + SetKeySchedule();
1.73 + }
1.74 +
1.75 +CExtendedCharacteristics* C3DesImpl::CreateExtendedCharacteristicsL()
1.76 + {
1.77 + // All Symbian software plug-ins have unlimited concurrency, cannot be reserved
1.78 + // for exclusive use and are not CERTIFIED to be standards compliant.
1.79 + return CExtendedCharacteristics::NewL(KMaxTInt, EFalse);
1.80 + }
1.81 +
1.82 +const CExtendedCharacteristics* C3DesImpl::GetExtendedCharacteristicsL()
1.83 + {
1.84 + return C3DesImpl::CreateExtendedCharacteristicsL();
1.85 + }
1.86 +
1.87 +TUid C3DesImpl::ImplementationUid() const
1.88 + {
1.89 + return KCryptoPlugin3DesUid;
1.90 + }
1.91 +
1.92 +TBool C3DesImpl::IsValidKeyLength(TInt aKeyBytes) const
1.93 + {
1.94 + return (aKeyBytes == K3DesKeyBytes);
1.95 + }
1.96 +
1.97 +TInt C3DesImpl::GetKeyStrength() const
1.98 + {
1.99 + // Exclude parity bits from each subkey
1.100 + return BytesToBits(K3DesKeyBytes - (3 * 8));
1.101 + }
1.102 +
1.103 +void C3DesImpl::TransformEncrypt(
1.104 + TUint8* aBuffer,
1.105 + TUint aNumBlocks)
1.106 + {
1.107 + for (TInt i = 0; i < aNumBlocks; ++i)
1.108 + {
1.109 + ModeEncryptStart(aBuffer);
1.110 +
1.111 + TUint32 l, r;
1.112 + // Split the block into 2 word-sized big endian portions
1.113 + GetBlockBigEndian(aBuffer, l, r);
1.114 +
1.115 + IPerm(l,r);
1.116 + // The mode is applied to the entire operation and NOT
1.117 + // for each DES transform
1.118 + TUid opMode = iOperationMode;
1.119 + iOperationMode = KOperationModeECBUid;
1.120 + DoTransform(l, r, iK1);
1.121 + DoTransform(r, l, iK2);
1.122 + DoTransform(l, r, iK3);
1.123 + iOperationMode = opMode;
1.124 + FPerm(l,r);
1.125 +
1.126 + // Put the portions back into the block as little endian
1.127 + PutBlockBigEndian(aBuffer, r, l);
1.128 + ModeEncryptEnd(aBuffer);
1.129 + aBuffer += KDesBlockBytes;
1.130 + }
1.131 + }
1.132 +
1.133 +void C3DesImpl::TransformDecrypt(
1.134 + TUint8* aBuffer,
1.135 + const TUint aNumBlocks)
1.136 + {
1.137 + for (TInt i = 0; i < aNumBlocks; ++i)
1.138 + {
1.139 + ModeDecryptStart(aBuffer);
1.140 +
1.141 + TUint32 l, r;
1.142 + // Split the block into 2 word-sized big endian portions
1.143 + GetBlockBigEndian(aBuffer, l, r);
1.144 +
1.145 + IPerm(l,r);
1.146 +
1.147 + // The mode is applied to the entire operation and NOT
1.148 + // for each DES transform
1.149 + TUid opMode = iOperationMode;
1.150 + iOperationMode = KOperationModeECBUid;
1.151 + DoTransform(l, r, iK1);
1.152 + DoTransform(r, l, iK2);
1.153 + DoTransform(l, r, iK3);
1.154 + iOperationMode = opMode;
1.155 + FPerm(l,r);
1.156 +
1.157 + // Put the portions back into the block as little endian
1.158 + PutBlockBigEndian(aBuffer, r, l);
1.159 + ModeDecryptEnd(aBuffer);
1.160 + aBuffer += K3DesBlockBytes;
1.161 + }
1.162 + }
1.163 +
1.164 +void C3DesImpl::SetKeySchedule()
1.165 + {
1.166 + if (iCryptoMode.iUid == KCryptoModeEncrypt)
1.167 + {
1.168 + // Encrypt -> Decrypt -> Encrypt
1.169 + // Encryptor key
1.170 + SetEncryptKeySchedule(iKey->Mid(0, KDesKeyBytes), iK1);
1.171 +
1.172 + // Decryptor key
1.173 + SetDecryptKeySchedule(iKey->Mid(KDesKeyBytes, 2 * KDesKeyBytes), iK2);
1.174 +
1.175 + // Encryptor key
1.176 + SetEncryptKeySchedule(iKey->Mid(2 * KDesKeyBytes), iK3);
1.177 + }
1.178 + else
1.179 + {
1.180 + // Decrypt -> Encrypt -> Decrypt
1.181 + // Key order is reversed !
1.182 +
1.183 + ASSERT(iCryptoMode.iUid == KCryptoModeDecrypt);
1.184 + // Decryptor key
1.185 + SetDecryptKeySchedule(iKey->Mid(0, KDesKeyBytes), iK3);
1.186 +
1.187 + // Encryptor key
1.188 + SetEncryptKeySchedule(iKey->Mid(KDesKeyBytes, 2 * KDesKeyBytes), iK2);
1.189 +
1.190 + // Decryptor key
1.191 + SetDecryptKeySchedule(iKey->Mid(2 * KDesKeyBytes), iK1);
1.192 + }
1.193 + }