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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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* RC2 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 __RC2_H__
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#define __RC2_H__
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#include "blocktransformation.h"
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#ifndef SYMBIAN_ENABLE_SPLIT_HEADERS
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/** OpenSSL PKCS8 Effective Key Length Compatibility.*/
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const TUint KPkcs8CompatibilityBits = 128;
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/** PKCS12 PBE Effective Key Length Compatibility.*/
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const TUint KPkcs12CompatibilityBits = 40;
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#endif
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/** The expanded key length of an RC2 key.*/
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const TUint KRC2ExpandedKeyLen = 64;
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/** SSL Effective Key Length Compatibility.*/
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const TUint KSSLCompatibilityBits = 1024;
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/** The maximum size in bytes for a RC2 key.*/
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const TUint KRC2MaxKeySizeBytes = 128; // Max key size in this implementation = 128 bytes
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/**
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* Abstract base class for RC2 encipherment.
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*
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*/
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class CRC2 : public CBlockTransformation
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{
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public:
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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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CRC2(void);
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virtual void SetKey(const TDesC8& aKey, TInt aEffectiveKeyLenBits);
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protected:
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/**
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* The expanded key buffer.
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*
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* Each iK[i] is a 16-bit word.
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*/
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TUint16 iK[KRC2ExpandedKeyLen]; // 128 bytes
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/**
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* The input key
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*
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* The key length must fall between 1 and KRC2MaxKeySizeBytes (=128) bytes inclusive.
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*/
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TBuf8<KRC2MaxKeySizeBytes> iKey;
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/** The effective key length in bits */
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TInt iEffectiveKeyLenBits;
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};
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/**
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* Concrete class for RC2 encryption.
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*
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*/
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class CRC2Encryptor : public CRC2
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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 must fall between
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* 1 and KRC2MaxKeySizeBytes (=128) bytes inclusive.
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* @param aEffectiveKeyLenBits Effective key length bits
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* (defaults KSSLCompatibilityBits = 1024).
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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 CRC2Encryptor* NewL(const TDesC8& aKey,
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TInt aEffectiveKeyLenBits = KSSLCompatibilityBits);
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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 must fall between
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* 1 and KRC2MaxKeySizeBytes (=128) bytes inclusive.
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* @param aEffectiveKeyLenBits Effective key length bits
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* (defaults KSSLCompatibilityBits = 1024).
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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 CRC2Encryptor* NewLC(const TDesC8& aKey,
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TInt aEffectiveKeyLenBits = KSSLCompatibilityBits);
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virtual void Transform(TDes8& aBlock);
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protected:
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/** @internalAll */
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CRC2Encryptor(void);
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};
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/**
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* Concrete class for RC2 decryption.
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*
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*/
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class CRC2Decryptor : public CRC2
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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 must fall between
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* 1 and KRC2MaxKeySizeBytes (=128) bytes inclusive.
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* @param aEffectiveKeyLenBits Effective key length bits
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* (defaults KSSLCompatibilityBits = 1024).
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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 CRC2Decryptor* NewL(const TDesC8& aKey,
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TInt aEffectiveKeyLenBits = KSSLCompatibilityBits);
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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 must fall between
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* 1 and KRC2MaxKeySizeBytes (=128) bytes inclusive.
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* @param aEffectiveKeyLenBits Effective key length bits
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* (defaults KSSLCompatibilityBits = 1024).
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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 CRC2Decryptor* NewLC(const TDesC8& aKey,
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TInt aEffectiveKeyLenBits = KSSLCompatibilityBits);
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virtual void Transform(TDes8& aBlock);
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protected:
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/** @internalAll */
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CRC2Decryptor(void);
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};
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#endif // __RC2_H__
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