1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/os/security/crypto/weakcrypto/source/symmetric/3des.cpp	Fri Jun 15 03:10:57 2012 +0200
     1.3 @@ -0,0 +1,138 @@
     1.4 +/*
     1.5 +* Copyright (c) 2002-2009 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 "3des.h"
    1.23 +#include "../common/inlines.h"
    1.24 +#include "des.inl"
    1.25 +#include <cryptostrength.h>
    1.26 +
    1.27 +const TInt K3DESBlockBytes = 8;
    1.28 +const TInt K3DESKeyBytes = 24;
    1.29 +const TInt KDESKeyBytes = 8;
    1.30 +
    1.31 +void C3DES::Transform(TDes8& aBlock)
    1.32 +	{
    1.33 +	assert(aBlock.Size() == K3DESBlockBytes);
    1.34 +		
    1.35 +	TUint32 l, r;
    1.36 +//	Split the block into 2 word-sized big endian portions
    1.37 +	GetBlockBigEndian((TUint8*)&aBlock[0], l, r);
    1.38 +
    1.39 +	IPerm(l,r);
    1.40 +
    1.41 +	DoTransform(l, r, iK1);
    1.42 +	DoTransform(r, l, iK2);
    1.43 +	DoTransform(l, r, iK3);
    1.44 +		
    1.45 +	FPerm(l,r);
    1.46 +
    1.47 +//	Put the portions back into the block as little endian
    1.48 +	PutBlockBigEndian((TUint8*)&aBlock[0], r, l);
    1.49 +	}
    1.50 +
    1.51 +TInt C3DES::BlockSize() const
    1.52 +	{
    1.53 +	return K3DESBlockBytes;
    1.54 +	}
    1.55 +
    1.56 +TInt C3DES::KeySize() const
    1.57 +	{
    1.58 +	return K3DESKeyBytes;
    1.59 +	}
    1.60 +
    1.61 +C3DES::C3DES()
    1.62 +	{
    1.63 +	}
    1.64 +
    1.65 +void C3DES::ConstructL(const TDesC8& aKey)
    1.66 +	{
    1.67 +	assert(aKey.Size() == K3DESKeyBytes);
    1.68 +
    1.69 +	iKey = aKey.AllocL();
    1.70 +	DoSetKey(*iKey);
    1.71 +	}
    1.72 +
    1.73 +void C3DES::Reset()
    1.74 +	{
    1.75 +	DoSetKey(*iKey);
    1.76 +	}
    1.77 +
    1.78 +/* C3DESEncryptor */
    1.79 +
    1.80 +EXPORT_C C3DESEncryptor* C3DESEncryptor::NewL(const TDesC8& aKey)
    1.81 +	{
    1.82 +	C3DESEncryptor* me = C3DESEncryptor::NewLC(aKey);
    1.83 +	CleanupStack::Pop(me);
    1.84 +	return (me);	
    1.85 +	}
    1.86 +
    1.87 +EXPORT_C C3DESEncryptor* C3DESEncryptor::NewLC(const TDesC8& aKey)
    1.88 +	{
    1.89 +	C3DESEncryptor* me = new (ELeave) C3DESEncryptor();
    1.90 +	CleanupStack::PushL(me);
    1.91 +	me->ConstructL(aKey);
    1.92 +	// DES only used 7 bits out of every key byte
    1.93 +	TCrypto::IsSymmetricWeakEnoughL(BytesToBits(aKey.Size()) - aKey.Size());
    1.94 +	return (me);	
    1.95 +	}
    1.96 +
    1.97 +void C3DESEncryptor::DoSetKey(const TDesC8& aKey)
    1.98 +	{
    1.99 +	// Encryptor key	
   1.100 +	SetKey(aKey.Mid(0, KDESKeyBytes), iK1);
   1.101 +	// Decryptor key
   1.102 +	SetKey(aKey.Mid(KDESKeyBytes, 2*KDESKeyBytes), iK2);
   1.103 +	ReverseKeySchedule(iK2); // Reverse key schedule order
   1.104 +	// Encryptor key
   1.105 +	SetKey(aKey.Mid(2*KDESKeyBytes), iK3);
   1.106 +	}
   1.107 + 
   1.108 +/* C3DESDecryptor */
   1.109 +
   1.110 +EXPORT_C C3DESDecryptor* C3DESDecryptor::NewL(const TDesC8& aKey)
   1.111 +	{
   1.112 +	C3DESDecryptor* me = C3DESDecryptor::NewLC(aKey);
   1.113 +	CleanupStack::Pop(me);
   1.114 +	return (me);
   1.115 +	}
   1.116 +
   1.117 +EXPORT_C C3DESDecryptor* C3DESDecryptor::NewLC(const TDesC8& aKey)
   1.118 +	{
   1.119 +	C3DESDecryptor* me = new (ELeave) C3DESDecryptor();
   1.120 +	CleanupStack::PushL(me);
   1.121 +	me->ConstructL(aKey);
   1.122 +	// DES only used 7 bits out of every key byte
   1.123 +	TCrypto::IsSymmetricWeakEnoughL(BytesToBits(aKey.Size()) - aKey.Size());
   1.124 +	return (me);
   1.125 +	}
   1.126 +
   1.127 +void C3DESDecryptor::DoSetKey(const TDesC8& aKey)
   1.128 +	{
   1.129 +	// 3DES decryption, reverse through key
   1.130 +	// Decryptor key
   1.131 +	CDES::SetKey(aKey.Mid(2*KDESKeyBytes), iK1);
   1.132 +	ReverseKeySchedule(iK1);	//	Reverse key schedule order	
   1.133 +
   1.134 +	// Encryptor key
   1.135 +	CDES::SetKey(aKey.Mid(KDESKeyBytes, 2*KDESKeyBytes), iK2);
   1.136 +	
   1.137 +	// Decryptor key
   1.138 +	CDES::SetKey(aKey.Mid(0, KDESKeyBytes), iK3);
   1.139 +	ReverseKeySchedule(iK3);	//	Reverse key schedule order
   1.140 +	}
   1.141 +