/*

* Copyright (c) 2006-2010 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: 

* Signer Abstract interface

*

*/

/**

 @file

 @publishedPartner

 @released

*/

#ifndef __CRYPTOAPI_SIGNER_H__

#define __CRYPTOAPI_SIGNER_H__

#include <cryptospi/cryptoplugin.h>

#include <cryptospi/keys.h>

namespace CryptoSpi

	{

	/**

	The Signer definition. Intended to allow plug-ins to implement 

	extensible signature signer functionality, and to work with all

	known existing  signature algorithms, e.g. DSA, RSA etc

	*/

	class MSignatureBase : public MPlugin

		{

	public:

		/**

		Set the padding mode for the signer or verifier. Reset() is called to reinitialise the cipher.

		@param aPaddingMode The padding mode of the signer

		@leave KErrNotSupported if the padding mode is not supported.

		@leave ...	Any of the crypto error codes defined in 

  					cryptospi_errs.h or any of the system-wide error codes.

		*/

		virtual void SetPaddingModeL(TUid aPaddingMode) = 0;

		/**

		Set the private key for the signer or verifier. Reset() is called to reinitialise the cipher.

		@param aPrivateKey The privatekey that used to sign

		@leave KErrArgument if key is not of the expected type.

		@leave KErrNotSupported if the key is not of valid length.

		@leave ...	Any of the crypto error codes defined in 

  					cryptospi_errs.h or any of the system-wide error codes.

		*/

		virtual void SetKeyL(const CKey& aPrivateKey) = 0;

		/**

		Gets the maximum size of input accepted by this object.

		@return The maximum length allowed in bytes

		@leave ...	Any of the crypto error codes defined in 

  					cryptospi_errs.h or any of the system-wide error codes.

		*/	 

		virtual TInt GetMaximumInputLengthL() const = 0;

		/**

		Gets the maximum size of output that can be generated by this object.

		@return The maximum output length in bytes

		@leave ...	Any of the crypto error codes defined in 

  					cryptospi_errs.h or any of the system-wide error codes.

		*/	 

		virtual TInt GetMaximumOutputLengthL() const = 0;

		};

	class MSigner : public MSignatureBase

		{

	public:

		/**

		Signs the input hash

		@param aInput	The hash of the message to sign

		@param aSignature The signature of the hash 

		@leave ...	Any of the crypto error codes defined in 

  					cryptospi_errs.h or any of the system-wide error codes.

		*/

		virtual void SignL(const TDesC8& aInput, CCryptoParams& aSignature) = 0;

		};

	class MAsyncSigner : public MSignatureBase

		{

	public:

		/**

		Set the public key for the signer

		@param aInput	The hash of the message to sign

		@param aSignature The signature of the hash 

		@param aRequestStatus

		@leave ...	Any of the crypto error codes defined in 

  					cryptospi_errs.h or any of the system-wide error codes.

		*/

		virtual void SignL(const TDesC8& aInput, CCryptoParams& aSignature, TRequestStatus& aRequestStatus) = 0;

		/**

		Cancel the outstanding request

		*/

		virtual void Cancel() = 0;

		};

	} // namespace CryptoSpi

#endif //__CRYPTOAPI_SIGNER_H__