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/*
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* Copyright (c) 2002-2009 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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* ** IMPORTANT ** PublishedPartner API's in this file are published to 3rd party developers via the
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* Symbian website. Changes to these API's should be treated as PublishedAll API changes and the Security TA should be consulted.
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* 3DES implementation
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*
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*/
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/**
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@file
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@publishedPartner
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@released
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*/
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#ifndef __3DES_H__
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#define __3DES_H__
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#include <des.h>
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/**
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* Abstract base class for triple-DES.
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*
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* Implements features common to triple-DES encryption and decryption.
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*
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*/
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class C3DES : public CDES
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{
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public:
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virtual void Transform(TDes8& aBlock);
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virtual void Reset();
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virtual TInt BlockSize() const;
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virtual TInt KeySize() const;
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protected:
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/** @internalAll */
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C3DES();
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virtual void ConstructL(const TDesC8& aKey);
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/**
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* Initialises the three key schedule arrays from the specified key.
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*
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* @param aKey The key to be used for encryption. The key length
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* must be K3DESKeySize = 24 bytes.
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*/
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virtual void DoSetKey(const TDesC8& aKey) = 0;
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protected:
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/** The second key schedule array */
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TUint32 iK2[KDESScheduleSizeInWords]; // = 32
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/** The third key schedule array */
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TUint32 iK3[KDESScheduleSizeInWords];
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};
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/**
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* Concrete class for triple-DES encryption.
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*
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*/
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class C3DESEncryptor : public C3DES
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{
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public:
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/**
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* Creates an instance of this class.
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*
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* @param aKey The key to be used for encryption. The key length
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* must be K3DESKeySize = 24 bytes.
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* @return A pointer to the new C3DESEncryptor object.
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*
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* @leave KErrKeyNotWeakEnough If the key size is larger than that allowed by the
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* cipher strength restrictions of the crypto library.
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* See TCrypto::IsSymmetricWeakEnoughL()
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*/
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IMPORT_C static C3DESEncryptor* NewL(const TDesC8& aKey);
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/**
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* Creates an instance of this class and leaves it on the cleanup stack.
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*
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* @param aKey The key to be used for encryption. The key length
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* must be K3DESKeySize = 24 bytes.
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* @return A pointer to the new C3DESEncryptor object.
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*
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* @leave KErrKeyNotWeakEnough If the key size is larger than that allowed by the
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* cipher strength restrictions of the crypto library.
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* See TCrypto::IsSymmetricWeakEnoughL()
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*/
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IMPORT_C static C3DESEncryptor* NewLC(const TDesC8& aKey);
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protected:
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virtual void DoSetKey(const TDesC8& aKey);
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};
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/**
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* Concrete class for triple-DES decryption.
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*
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*/
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class C3DESDecryptor : public C3DES
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{
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public:
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/**
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* Creates an instance of this class.
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*
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* @param aKey The key to be used for decryption. The key length
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* must be K3DESKeySize = 24 bytes.
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* @return A pointer to the new C3DESDecryptor object.
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*
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* @leave KErrKeyNotWeakEnough If the key size is larger than that allowed by the
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* cipher strength restrictions of the crypto library.
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* See TCrypto::IsSymmetricWeakEnoughL()
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*/
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IMPORT_C static C3DESDecryptor* NewL(const TDesC8& aKey);
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/**
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* Creates an instance of this class and leaves it on the cleanup stack.
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*
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* @param aKey The key to be used for decryption. The key length
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* must be K3DESKeySize = 24 bytes.
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* @return A pointer to the new C3DESDecryptor object.
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*
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* @leave KErrKeyNotWeakEnough If the key size is larger than that allowed by the
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* cipher strength restrictions of the crypto library.
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* See TCrypto::IsSymmetricWeakEnoughL()
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*/
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IMPORT_C static C3DESDecryptor* NewLC(const TDesC8& aKey);
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protected:
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virtual void DoSetKey(const TDesC8& aKey);
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};
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#endif // __3DES_H__
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