author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Tue, 25 May 2010 14:37:45 +0300 | |
branch | RCL_3 |
changeset 63 | 07c4e3a0535d |
parent 15 | da2ae96f639b |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2007-2009 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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|
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|
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/** |
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@file |
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@internalComponent |
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@released |
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*/ |
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#include "h4cipherimpl.h" |
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|
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#include <e32def.h> |
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#include <cryptostrength.h> |
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#include <cryptospi/cryptospidef.h> |
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#include "keys.h" |
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#include <cryptospi/plugincharacteristics.h> |
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#include "pluginconfig.h" |
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#include <cryptopanic.h> |
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#include <securityerr.h> |
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#include "keyhandle.h" |
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using namespace HwCrypto; |
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#define BytesToBits(byteCount) (byteCount*8) |
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|
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// |
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// Implementation of Symmetric Cipher class |
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// |
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CH4CipherImpl::CH4CipherImpl(TUint8 aBlockBytes, |
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TUid aCryptoMode, |
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TUid aOperationMode, |
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TUid aPaddingMode) |
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: iBlockBytes(aBlockBytes), |
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iCryptoMode(aCryptoMode), |
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iOperationMode(aOperationMode), |
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iPaddingMode(aPaddingMode) |
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{ |
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} |
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|
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void CH4CipherImpl::ConstructL(const CKey& aKey) |
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{ |
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SetKeyL(aKey); |
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SetOperationModeL(iOperationMode); |
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SetCryptoModeL(iCryptoMode); |
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SetPaddingModeL(iPaddingMode); |
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|
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iPartialBlock.ReAllocL(iBlockBytes); |
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iPaddingBlock.ReAllocL(iBlockBytes); |
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|
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iIv.ReAllocL(iBlockBytes); |
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// iIv.SetLength(iBlockBytes); |
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// TRandom::RandomL(iIv); |
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} |
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|
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CExtendedCharacteristics* CH4CipherImpl::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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|
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// return CExtendedCharacteristics::NewL(KMaxTInt, iStandardsConformance, EFalse); |
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return 0; |
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} |
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|
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CH4CipherImpl::~CH4CipherImpl() |
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{ |
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delete iPadding; |
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iIv.Close(); |
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iPartialBlock.Close(); |
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iPaddingBlock.Close(); |
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|
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delete iKey; |
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iStandardsConformance.Close(); |
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} |
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|
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void CH4CipherImpl::Close() |
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{ |
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delete this; |
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} |
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TAny* CH4CipherImpl::GetExtension(TUid /*aExtensionId*/) |
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{ |
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return 0; |
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} |
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|
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void CH4CipherImpl::GetCharacteristicsL(const TAny*& aPluginCharacteristics) |
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{ |
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TInt numCiphers = sizeof(KSymmetricCipherCharacteristics)/sizeof(TSymmetricCipherCharacteristics*); |
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TInt32 implUid = ImplementationUid().iUid; |
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for (TInt i = 0; i < numCiphers; ++i) |
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{ |
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if (KSymmetricCipherCharacteristics[i]->cmn.iImplementationUID == implUid) |
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106 |
{ |
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107 |
aPluginCharacteristics = KSymmetricCipherCharacteristics[i]; |
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108 |
break; |
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109 |
} |
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110 |
} |
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111 |
} |
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112 |
|
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113 |
|
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114 |
void CH4CipherImpl::Reset() |
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115 |
{ |
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116 |
iPartialBlock.Zero(); |
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iPaddingBlock.Zero(); |
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118 |
|
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119 |
// Reconfigure h/w based on iCryptoMode/iOperationMode/iKey/iIv |
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120 |
TRAP_IGNORE(DoSetupL()); |
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121 |
iNeedToSetupHw = EFalse; |
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122 |
} |
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123 |
|
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124 |
|
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125 |
TInt CH4CipherImpl::GetKeyStrength() const |
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126 |
{ |
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return BytesToBits(iKey->Length()); |
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128 |
} |
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129 |
|
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130 |
HBufC8* CH4CipherImpl::ExtractKeyDataLC(const CKey& aKey) const |
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131 |
{ |
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const TDesC8& keyContent = aKey.GetTDesC8L(KSymmetricKeyParameterUid); |
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return keyContent.AllocLC(); |
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134 |
} |
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135 |
|
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TInt CH4CipherImpl::KeySize() const |
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137 |
{ |
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138 |
// return key size in BITS |
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139 |
return BytesToBits(iKeyBytes); |
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140 |
} |
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141 |
|
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142 |
void CH4CipherImpl::SetKeyL(const CKey& aKey) |
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143 |
{ |
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144 |
HBufC8* key = ExtractKeyDataLC(aKey); |
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145 |
TInt keyLength(key->Length()); |
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146 |
|
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147 |
const TKeyProperty &keyProps = aKey.KeyProperty(); |
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148 |
|
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149 |
if(keyProps.iKeyType != KSymmetricKeyUid) |
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150 |
{ |
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151 |
User::Leave(KErrArgument); |
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152 |
} |
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153 |
|
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154 |
if(keyProps.iKeyAttribute == KNonEmbeddedKeyUid) |
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155 |
{ |
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156 |
// Not an embedded key, so key is the actual key data and we |
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157 |
// can therefore check its strength... |
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158 |
TCrypto::IsSymmetricWeakEnoughL(BytesToBits(keyLength)); |
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159 |
if (! IsValidKeyLength(keyLength)) |
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160 |
{ |
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161 |
User::Leave(KErrNotSupported); |
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162 |
} |
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163 |
} |
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|
164 |
|
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|
165 |
delete iKey; |
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|
166 |
CleanupStack::Pop(key); |
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|
167 |
iKey = key; |
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|
168 |
iKeyBytes = keyLength; |
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|
169 |
|
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|
170 |
// H/W needs reconfiguring |
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|
171 |
iNeedToSetupHw = ETrue; |
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|
172 |
} |
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|
173 |
|
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|
174 |
TInt CH4CipherImpl::BlockSize() const |
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|
175 |
{ |
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|
176 |
// return block size in BITS |
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|
177 |
return BytesToBits(iBlockBytes); |
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|
178 |
} |
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|
179 |
|
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|
180 |
void CH4CipherImpl::SetCryptoModeL(TUid aCryptoMode) |
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|
181 |
{ |
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|
182 |
switch (aCryptoMode.iUid) |
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|
183 |
{ |
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|
184 |
case KCryptoModeEncrypt: |
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|
185 |
case KCryptoModeDecrypt: |
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|
186 |
break; |
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|
187 |
default: |
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|
188 |
User::Leave(KErrNotSupported); |
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|
189 |
} |
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|
190 |
iCryptoMode = aCryptoMode; |
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|
191 |
// H/W needs reconfiguring |
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|
192 |
iNeedToSetupHw = ETrue; |
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|
193 |
} |
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|
194 |
|
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|
195 |
void CH4CipherImpl::SetOperationModeL(TUid aOperationMode) |
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|
196 |
{ |
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|
197 |
switch (aOperationMode.iUid) |
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|
198 |
{ |
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|
199 |
case KOperationModeNone: |
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|
200 |
case KOperationModeECB: |
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|
201 |
case KOperationModeCBC: |
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|
202 |
break; |
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|
203 |
default: |
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|
204 |
User::Leave(KErrNotSupported); |
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|
205 |
} |
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|
206 |
iOperationMode = aOperationMode; |
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|
207 |
// H/W needs reconfiguring |
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|
208 |
iNeedToSetupHw = ETrue; |
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|
209 |
} |
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|
210 |
|
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|
211 |
void CH4CipherImpl::SetPaddingModeL(TUid aPaddingMode) |
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|
212 |
{ |
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diff
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|
213 |
if(!iPadding || (aPaddingMode != iPaddingMode)) |
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|
214 |
{ |
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|
215 |
CPadding* padding(0); |
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diff
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|
216 |
switch (aPaddingMode.iUid) |
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|
217 |
{ |
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|
218 |
case KPaddingModeNone: |
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|
219 |
padding = CPaddingNone::NewL(iBlockBytes); |
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|
220 |
break; |
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diff
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|
221 |
case KPaddingModeSSLv3: |
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|
222 |
padding = CPaddingSSLv3::NewL(iBlockBytes); |
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|
223 |
break; |
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|
224 |
case KPaddingModePKCS7: |
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|
225 |
padding = CPaddingPKCS7::NewL(iBlockBytes); |
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|
226 |
break; |
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diff
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|
227 |
default: |
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|
228 |
User::Leave(KErrNotSupported); |
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|
229 |
} |
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|
230 |
delete iPadding; |
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|
231 |
iPadding = padding; |
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|
232 |
iPaddingMode = aPaddingMode; |
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|
233 |
} |
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diff
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|
234 |
|
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|
235 |
// H/W needs reconfiguring |
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|
236 |
iNeedToSetupHw = ETrue; |
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|
237 |
} |
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diff
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|
238 |
|
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|
239 |
void CH4CipherImpl::SetIvL(const TDesC8& aIv) |
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|
240 |
{ |
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|
241 |
if (iOperationMode.iUid != KOperationModeCBC) |
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|
242 |
{ |
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diff
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|
243 |
User::Leave(KErrNotSupported); |
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|
244 |
} |
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|
245 |
|
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|
246 |
if (aIv.Length() != iBlockBytes) |
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|
247 |
{ |
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|
248 |
User::Leave(KErrArgument); |
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|
249 |
} |
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|
250 |
iIv = aIv; |
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parents:
diff
changeset
|
251 |
|
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diff
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|
252 |
// H/W needs reconfiguring |
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diff
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|
253 |
iNeedToSetupHw = ETrue; |
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diff
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|
254 |
} |
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diff
changeset
|
255 |
|
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diff
changeset
|
256 |
|
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diff
changeset
|
257 |
|
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parents:
diff
changeset
|
258 |
|
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diff
changeset
|
259 |
|
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diff
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|
260 |
|
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parents:
diff
changeset
|
261 |
|
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parents:
diff
changeset
|
262 |
|
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parents:
diff
changeset
|
263 |
|
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parents:
diff
changeset
|
264 |
TInt CH4CipherImpl::MaxOutputLength(TInt aInputLength) const |
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diff
changeset
|
265 |
{ |
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Revision: 200935
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parents:
diff
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|
266 |
// The maximum output length required for Process is equal to the |
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Revision: 200935
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parents:
diff
changeset
|
267 |
// size of the number of whole input blocks available. |
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diff
changeset
|
268 |
// |
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parents:
diff
changeset
|
269 |
// The block bytes is a power of two so we can use this to avoid |
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parents:
diff
changeset
|
270 |
// doing a real mod operation |
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parents:
diff
changeset
|
271 |
TUint partialBlockLength(iPartialBlock.Length()); |
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diff
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|
272 |
return (partialBlockLength + aInputLength) & ~TUint32(iBlockBytes - 1); |
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parents:
diff
changeset
|
273 |
} |
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Revision: 200935
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parents:
diff
changeset
|
274 |
|
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parents:
diff
changeset
|
275 |
TInt CH4CipherImpl::MaxFinalOutputLength(TInt aInputLength) const |
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parents:
diff
changeset
|
276 |
{ |
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Revision: 200935
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parents:
diff
changeset
|
277 |
if (iCryptoMode.iUid == KCryptoModeEncrypt) |
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Revision: 200935
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parents:
diff
changeset
|
278 |
{ |
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Revision: 200935
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parents:
diff
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|
279 |
return iPadding->MaxPaddedLength(iPartialBlock.Length() + aInputLength); |
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parents:
diff
changeset
|
280 |
} |
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parents:
diff
changeset
|
281 |
else |
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parents:
diff
changeset
|
282 |
{ |
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Revision: 200935
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parents:
diff
changeset
|
283 |
return iPadding->MaxUnPaddedLength(aInputLength + iPartialBlock.Length()); |
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parents:
diff
changeset
|
284 |
} |
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Revision: 200935
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parents:
diff
changeset
|
285 |
} |
35751d3474b7
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parents:
diff
changeset
|
286 |
|
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parents:
diff
changeset
|
287 |
|
35751d3474b7
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parents:
diff
changeset
|
288 |
|
35751d3474b7
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parents:
diff
changeset
|
289 |
void CH4CipherImpl::ProcessL(const TDesC8& aInput, TDes8& aOutput) |
35751d3474b7
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parents:
diff
changeset
|
290 |
{ |
35751d3474b7
Revision: 200935
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parents:
diff
changeset
|
291 |
if(iNeedToSetupHw) |
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parents:
diff
changeset
|
292 |
{ |
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Revision: 200935
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parents:
diff
changeset
|
293 |
// Reconfigure h/w based on iCryptoMode/iOperationMode/iKey/iIv |
35751d3474b7
Revision: 200935
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parents:
diff
changeset
|
294 |
DoSetupL(); |
35751d3474b7
Revision: 200935
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parents:
diff
changeset
|
295 |
iNeedToSetupHw = EFalse; |
35751d3474b7
Revision: 200935
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parents:
diff
changeset
|
296 |
} |
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parents:
diff
changeset
|
297 |
|
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Revision: 200935
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parents:
diff
changeset
|
298 |
TInt inputLength(aInput.Length()); |
35751d3474b7
Revision: 200935
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parents:
diff
changeset
|
299 |
if (MaxOutputLength(inputLength) > aOutput.MaxLength()) |
35751d3474b7
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parents:
diff
changeset
|
300 |
{ |
35751d3474b7
Revision: 200935
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parents:
diff
changeset
|
301 |
User::Leave(KErrOverflow); |
35751d3474b7
Revision: 200935
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parents:
diff
changeset
|
302 |
} |
35751d3474b7
Revision: 200935
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parents:
diff
changeset
|
303 |
|
35751d3474b7
Revision: 200935
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parents:
diff
changeset
|
304 |
TInt partialBlockLength(iPartialBlock.Length()); // partial data written to h/w last time |
35751d3474b7
Revision: 200935
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parents:
diff
changeset
|
305 |
TUint32 totalInput = partialBlockLength + inputLength; |
35751d3474b7
Revision: 200935
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parents:
diff
changeset
|
306 |
|
35751d3474b7
Revision: 200935
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parents:
diff
changeset
|
307 |
// Pass new data to h/w driver |
35751d3474b7
Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
308 |
DoWriteL(aInput.Ptr(), inputLength); |
35751d3474b7
Revision: 200935
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parents:
diff
changeset
|
309 |
|
35751d3474b7
Revision: 200935
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parents:
diff
changeset
|
310 |
if(totalInput < iBlockBytes) |
35751d3474b7
Revision: 200935
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parents:
diff
changeset
|
311 |
{ |
35751d3474b7
Revision: 200935
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parents:
diff
changeset
|
312 |
// Keep a copy of the partial block which is inside the h/w |
35751d3474b7
Revision: 200935
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parents:
diff
changeset
|
313 |
// driver in case we need to calculate pad for it later... |
35751d3474b7
Revision: 200935
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parents:
diff
changeset
|
314 |
if(inputLength) iPartialBlock.Append(aInput); |
35751d3474b7
Revision: 200935
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parents:
diff
changeset
|
315 |
// Not enough written yet for more data to be available yet. |
35751d3474b7
Revision: 200935
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parents:
diff
changeset
|
316 |
return; |
35751d3474b7
Revision: 200935
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parents:
diff
changeset
|
317 |
} |
35751d3474b7
Revision: 200935
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parents:
diff
changeset
|
318 |
else |
35751d3474b7
Revision: 200935
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parents:
diff
changeset
|
319 |
{ |
35751d3474b7
Revision: 200935
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parents:
diff
changeset
|
320 |
// We have completed the previous partial block so we no |
35751d3474b7
Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
321 |
// longer need to keep a copy of it |
35751d3474b7
Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
322 |
iPartialBlock.Zero(); |
35751d3474b7
Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
323 |
// Work out length of partial block at end of current data |
35751d3474b7
Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
324 |
TUint32 trailing = TUint32(partialBlockLength + inputLength) & TUint32(iBlockBytes - 1); |
35751d3474b7
Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
325 |
// Keep a copy of the partial block data |
35751d3474b7
Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
326 |
if(trailing) iPartialBlock.Append(aInput.Right(trailing)); |
35751d3474b7
Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
327 |
} |
35751d3474b7
Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
328 |
|
35751d3474b7
Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
329 |
// |
35751d3474b7
Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
330 |
// Work out how much data is available for reading. |
35751d3474b7
Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
331 |
// |
35751d3474b7
Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
332 |
// The h/w processes data a block at a time, and we only ever read |
35751d3474b7
Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
333 |
// a multiple of the block size so the available data will always |
35751d3474b7
Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
334 |
// be a multiple of the blocksize. |
35751d3474b7
Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
335 |
|
35751d3474b7
Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
336 |
TUint32 availableData = totalInput & ~TUint32(iBlockBytes - 1); |
35751d3474b7
Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
337 |
if (availableData) |
35751d3474b7
Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
338 |
{ |
35751d3474b7
Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
339 |
// Read available data |
35751d3474b7
Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
340 |
DoReadL(aOutput, availableData); |
35751d3474b7
Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
341 |
} |
35751d3474b7
Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
342 |
} |
35751d3474b7
Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
343 |
|
35751d3474b7
Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
344 |
void CH4CipherImpl::ProcessFinalL(const TDesC8& aInput, TDes8& aOutput) |
35751d3474b7
Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
345 |
{ |
35751d3474b7
Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
346 |
if(iNeedToSetupHw) |
35751d3474b7
Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
347 |
{ |
35751d3474b7
Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
348 |
// Reconfigure h/w based on iCryptoMode/iOperationMode/iKey/iIv |
35751d3474b7
Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
349 |
DoSetupL(); |
35751d3474b7
Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
350 |
iNeedToSetupHw = EFalse; |
35751d3474b7
Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
351 |
} |
35751d3474b7
Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
352 |
|
35751d3474b7
Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
353 |
if(MaxFinalOutputLength(aInput.Length()) > aOutput.MaxLength() - aOutput.Length()) |
35751d3474b7
Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
354 |
{ |
35751d3474b7
Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
355 |
User::Leave(KErrOverflow); |
35751d3474b7
Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
356 |
} |
35751d3474b7
Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
357 |
|
35751d3474b7
Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
358 |
|
35751d3474b7
Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
359 |
if(iCryptoMode.iUid == KCryptoModeEncrypt) |
35751d3474b7
Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
360 |
{ |
35751d3474b7
Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
361 |
// process everything up to the last (possibly empty block) |
35751d3474b7
Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
362 |
ProcessL(aInput, aOutput); |
35751d3474b7
Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
363 |
|
35751d3474b7
Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
364 |
// pad the plaintext |
35751d3474b7
Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
365 |
iPaddingBlock.Zero(); |
35751d3474b7
Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
366 |
iPadding->PadL(iPartialBlock, iPaddingBlock); |
35751d3474b7
Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
367 |
|
35751d3474b7
Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
368 |
TUint32 padLength = iPaddingBlock.Length(); |
35751d3474b7
Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
369 |
// Make sure pad worked |
35751d3474b7
Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
370 |
if(padLength & TUint32(iBlockBytes-1)) |
35751d3474b7
Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
371 |
{ |
35751d3474b7
Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
372 |
User::Leave(KErrInvalidPadding); |
35751d3474b7
Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
373 |
} |
35751d3474b7
Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
374 |
|
35751d3474b7
Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
375 |
if(padLength > 0) |
35751d3474b7
Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
376 |
{ |
35751d3474b7
Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
377 |
// Padding created |
35751d3474b7
Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
378 |
|
35751d3474b7
Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
379 |
// We have already written iPartialBlock data to the h/w |
35751d3474b7
Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
380 |
// so skip those bytes which are in the pad. |
35751d3474b7
Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
381 |
TUint32 partialLength = iPartialBlock.Length(); |
35751d3474b7
Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
382 |
if(partialLength) |
35751d3474b7
Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
383 |
{ |
35751d3474b7
Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
384 |
// Make sure the pad algorithm did not change the bytes at |
35751d3474b7
Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
385 |
// the start of the block.... |
35751d3474b7
Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
386 |
if(iPaddingBlock.Left(partialLength) != iPartialBlock) |
35751d3474b7
Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
387 |
{ |
35751d3474b7
Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
388 |
User::Leave(KErrInvalidPadding); |
35751d3474b7
Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
389 |
} |
35751d3474b7
Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
390 |
} |
35751d3474b7
Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
391 |
// Pass new data to h/w driver |
35751d3474b7
Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
392 |
DoWriteL(iPaddingBlock.Ptr() + partialLength, padLength - partialLength); |
35751d3474b7
Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
393 |
|
35751d3474b7
Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
394 |
// Have now written an exact multiple of blocks to h/w so clear partial |
35751d3474b7
Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
395 |
iPartialBlock.Zero(); |
35751d3474b7
Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
396 |
|
35751d3474b7
Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
397 |
// Read data |
35751d3474b7
Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
398 |
DoReadL(aOutput, padLength); |
35751d3474b7
Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
399 |
} |
35751d3474b7
Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
400 |
} |
35751d3474b7
Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
401 |
else |
35751d3474b7
Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
402 |
{ |
35751d3474b7
Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
403 |
// Decrypt |
35751d3474b7
Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
404 |
|
35751d3474b7
Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
405 |
// Input length (including inputstore) must be a multiple of the |
35751d3474b7
Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
406 |
// block size in length |
35751d3474b7
Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
407 |
if ((aInput.Length() + iPartialBlock.Length()) & (iBlockBytes - 1)) |
35751d3474b7
Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
408 |
{ |
35751d3474b7
Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
409 |
User::Leave(KErrArgument); |
35751d3474b7
Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
410 |
} |
35751d3474b7
Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
411 |
|
35751d3474b7
Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
412 |
// process everything up to the last (possibly empty block) |
35751d3474b7
Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
413 |
ProcessL(aInput, aOutput); |
35751d3474b7
Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
414 |
ASSERT(iPartialBlock.Length()==0); // all the blocks should have been decrypted |
35751d3474b7
Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
415 |
|
35751d3474b7
Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
416 |
// Retrieve last decrypted block. |
35751d3474b7
Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
417 |
iPaddingBlock = aOutput.Right(iBlockBytes); |
35751d3474b7
Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
418 |
aOutput.SetLength(aOutput.Length() - iBlockBytes); |
35751d3474b7
Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
419 |
|
35751d3474b7
Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
420 |
// Unpad the last block and (re)append to output |
35751d3474b7
Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
421 |
iPadding->UnPadL(iPaddingBlock, aOutput); |
35751d3474b7
Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
422 |
|
35751d3474b7
Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
423 |
iPaddingBlock.Zero(); |
35751d3474b7
Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
424 |
iPartialBlock.Zero(); |
35751d3474b7
Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
425 |
} |
35751d3474b7
Revision: 200935
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
426 |
|
35751d3474b7
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// End of file |
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