/*

* Copyright (c) 2002-2009 Nokia Corporation and/or its subsidiary(-ies).

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of the License "Eclipse Public License v1.0"

* which accompanies this distribution, and is available

* at the URL "http://www.eclipse.org/legal/epl-v10.html".

*

* Initial Contributors:

* Nokia Corporation - initial contribution.

*

* Contributors:

*

* Description: 

* Declares key helper classes for PKCS#10 that perform the algorithm dependant work.

*

*/

/**

 @file

 @internalComponent

 @released 

*/

#ifndef __PKCS10KEYHELPER_H__

#define __PKCS10KEYHELPER_H__

#include <mctkeystore.h>

#include <x509keys.h>

class CASN1EncBase;

class CASN1EncSequence;

class CASN1EncBitString;

/**

 * Abstract base class defines the interface for PKCS#10 key helpers.

 *

 * This class is fairly dumb, and provides a generic interface for various

 * keystore functionality.  The methods are called from the RunL of

 * CPKCS10Request.

 *

 * The implementation decodes the public key to create a public key object -

 * this is pretty wasteful, as the first thing we're going to do is re-encode it

 * again, mostly in exactly the same format.  However it's simpler and less

 * error-prome to do it this way.

 */

class CPKCS10KeyHelper : public CBase

	{

 public:

	/**

	 * Create appropriate subclass of CPKCS10KeyHelper depending on key

	 * alogorithm.

	 *

	 * @param aKeyStore The keystore to use - this object takes ownership.

	 * @param aKeyInfo The key to use.

	 */	

	static CPKCS10KeyHelper* CreateKeyHelperL(MCTKeyStore& aKeyStore,

											  const CCTKeyInfo& aKeyInfo,

											  const TDesC8& aExportedKey,

											  const TAlgorithmId aDigestId);

	virtual ~CPKCS10KeyHelper();

 public:

	void FetchPublicKey(TRequestStatus& aStatus);

	void CancelFetchPublicKey();

	virtual void OpenSigner(TRequestStatus& aStatus) = 0;

	virtual void CancelOpenSigner() = 0;

	virtual void SignDigestL(const TDesC8& aDigest, TRequestStatus& aStatus) = 0;

	virtual void CancelSignDigest() = 0;

	virtual CASN1EncBase* EncodeKeyLC();

	virtual CASN1EncSequence* EncodeSignatureAlgorithmLC();

	virtual CASN1EncBitString* EncodeSignatureLC() = 0;

 protected:

	CPKCS10KeyHelper(MCTKeyStore& aKeyStore, const CCTKeyInfo& aKeyInfo);

	virtual void CreateKeyEncoderL(const TDesC8& aExportedKey,

								   const TAlgorithmId aDigestId) = 0;

	CASN1EncBase* DigestInfoLC(const TDesC8& digest);

 protected:

	MCTKeyStore&		iKeyStore;

	const CCTKeyInfo&	iKeyInfo;

	TX509KeyEncoder*	iKeyEncoder;

	};

/**

 * Implementation of PKCS#10 key helper for RSA keys.

 */

class CPKCS10RSAKeyHelper : public CPKCS10KeyHelper

	{

 public:

	CPKCS10RSAKeyHelper(MCTKeyStore& aKeyStore, const CCTKeyInfo& aKeyInfo);

	virtual ~CPKCS10RSAKeyHelper();

 private:

	virtual void OpenSigner(TRequestStatus& aStatus);

	virtual void CancelOpenSigner();

	virtual void SignDigestL(const TDesC8& aDigest, TRequestStatus& aStatus);

	virtual void CancelSignDigest();	

	virtual void CreateKeyEncoderL(const TDesC8& aExportedKey, const TAlgorithmId aDigestId);

	virtual CASN1EncBitString* EncodeSignatureLC();

private:

	CRSAPublicKey*		iPublicKey;

	MRSASigner*			iRSASigner;

	CRSASignature*		iRSASignature;

	HBufC8* 			iDigestBuf;

	};

/**

 * Implementation of PKCS#10 key helper for DSA keys.

 */

class CPKCS10DSAKeyHelper : public CPKCS10KeyHelper

	{

 public:

	CPKCS10DSAKeyHelper(MCTKeyStore& aKeyStore, const CCTKeyInfo& aKeyInfo);

	virtual ~CPKCS10DSAKeyHelper();

 private:

	virtual void OpenSigner(TRequestStatus& aStatus);

	virtual void CancelOpenSigner();

	virtual void SignDigestL(const TDesC8& aDigest, TRequestStatus& aStatus);

	virtual void CancelSignDigest();	

	virtual void CreateKeyEncoderL(const TDesC8& aExportedKey, const TAlgorithmId aDigestId);

	virtual CASN1EncSequence* EncodeSignatureAlgorithmLC();

	virtual CASN1EncBitString* EncodeSignatureLC();

 private:

 	CDSAPublicKey* 		iPublicKey;

	MDSASigner*			iDSASigner;

	CDSASignature*		iDSASignature;

	};

#endif