crypto/weakcryptospi/source/asymmetric/dsashim.h
author Mikko Sunikka <mikko.sunikka@nokia.com>
Fri, 06 Nov 2009 13:21:00 +0200
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/*
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* Copyright (c) 2006-2009 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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* DSA shim classes definition
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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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#ifndef __DSASHIM_H__
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#define __DSASHIM_H__
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#include <asymmetric.h>
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namespace CryptoSpi
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	{
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	class CSigner;
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	class CVerifier;
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	class CKey;
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	}
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NONSHARABLE_CLASS(CDsaSignerShim) : public CDSASigner
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{
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public:
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	/**
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	Creates an CDsaSignerShim object which has the same interface
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	as CDSASigner but delegates all work to a Crypto SPI plug-in.
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	@param aKey The signing key
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	@return A pointer to a CDsaSignerShim instance
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	*/
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	static CDsaSignerShim* NewL(const CDSAPrivateKey& aKey);
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	/**
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	Creates an CDsaSignerShim object which has the same interface
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	as CDSASigner but delegates all work to a Crypto SPI plug-in.
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	A pointer to the new object is placed on the cleanup stack
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	@param aKey The signing key
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	@return A pointer to a CDsaSignerShim instance
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	*/
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	static CDsaSignerShim* NewLC(const CDSAPrivateKey& aKey);
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	/**
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	Digitally signs the specified input message 
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	Note that in order to be interoperable and compliant with the DSS, aInput
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	must be the result of a SHA-1 hash.
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	@param aInput	A SHA-1 hash of the message to sign
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	@return			A pointer to a new CSignature object
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	@panic ECryptoPanicInputTooLarge	If aInput is larger than MaxInputLength(),
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										which is likely to happen if the caller
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										has passed in something that has not been hashed.
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	*/
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	virtual CDSASignature* SignL(const TDesC8& aInput) const;
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	//From MSignatureSystem
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	virtual TInt MaxInputLength() const;
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	/// Destructor
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	~CDsaSignerShim();
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private:
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	/// Constructor
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	CDsaSignerShim(const CDSAPrivateKey& aKey);
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	void ConstructL(const CDSAPrivateKey& aKey);
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private:
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	/// SPI delegate
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	CryptoSpi::CSigner* iSignerImpl;
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	/// SPI requires all key to passed as key-objects
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	CryptoSpi::CKey* iKey;
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};
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NONSHARABLE_CLASS(CDsaVerifierShim) : public CDSAVerifier
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{
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public:
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	/**
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	Creates an CDsaVerifierShim object which has the same interface
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	as CDSAVerifier but delegates all work to a Crypto SPI plug-in.
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	@param aKey The verification key
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	@return A pointer to a CDsaVerifierShim instance
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	*/
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	static CDsaVerifierShim* NewL(const CDSAPublicKey& aKey);
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	/**
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	Creates an CDsaVerifierShim object which has the same interface
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	as CDSAVerifier but delegates all work to a Crypto SPI plug-in.
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	A pointer to the new object is placed on the cleanup stack
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	@param aKey The verification key
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	@return A pointer to a CDsaVerifierShim instance
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	*/
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	static CDsaVerifierShim* NewLC(const CDSAPublicKey& aKey);
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	//From CVerifier	
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	virtual TBool VerifyL(const TDesC8& aInput, const CDSASignature& aSignature) const;
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	//From MSignatureSystem
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	virtual TInt MaxInputLength() const;
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	// Destructor
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	~CDsaVerifierShim();
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private:
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	// Constructor
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	CDsaVerifierShim(const CDSAPublicKey& aKey);
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	void ConstructL(const CDSAPublicKey& aKey);
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private:
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	/// SPI delegate
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	CryptoSpi::CVerifier* iVerifierImpl;
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	/// SPI requires all key to passed as key-objects
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	CryptoSpi::CKey* iKey;
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};
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#endif // __DSASHIM_H__