/*

* Copyright (c) 2000, 2002, 2004, 2010 Nokia Corporation and/or its subsidiary(-ies). 

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of "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:   This file contains the header of CCrCrypto class.

*

*/

#ifndef CR_CRYPTO_H

#define CR_CRYPTO_H

//  INCLUDES

#include <e32base.h>    // CBase.

#include "cralginfo.h"  // CCrAlgInfo

#include <crdata.h>

//  CONSTANTS

const TInt NO_PROCESS = -1;

const TInt KLenFileBuffer = 1000;

//  DATA TYPES

// Padding rules. 

enum TPaddingRule

    {

    ECrNone,

    ECrPKCS1,

    ECrSSLv3

    };

// Algorithms.

enum TCrAsymAlgorithm

    {

    ECrRSA,

    ECrDSA,

    ECrLAST_ASYMM_CRYPTO

    };                   

// CLASS DECLARATION

/**

*  class CCrCrypto

*  CCrCrypto crypto API, which is used in CrPKCS12.

*

*  @lib crpkcs12.lib

*  @since Series 60 3.0

*/

NONSHARABLE_CLASS( CCrCrypto ): public CBase

    {

    // Constructors and destructors.

    private:

        CCrCrypto();

        void ConstructL();

    public:

        ~CCrCrypto();

        static CCrCrypto* NewLC(); 

        static CCrCrypto* NewL();

    public: // Functions.

        /**

        * Initialize encryption or decryption with Triple DES algorithm

        * using three different keys.

        * @param aKey1 1. key.

        * @param aKey2 2. key.

        * @param aKey3 3. key.

        * @param aIV Initialization vector.

        * @param aEncrypt Encrypt if true.

        * @param aMode Algorithm mode.

        * @param aPadRule Padding rule.

        * @return KCrCrypto | KCrUnknownMode

        *         KCrCrypto | KCrUnknownLibrary

        *         KCrOK

        */

        TCrStatus InitCrypt3DESL(

            const TDesC8& aKey1,                

            const TDesC8& aKey2,                

            const TDesC8& aKey3,                

            const TDesC8& aIV,                  

            TBool         aEncrypt = ETrue,     

            TCrSymmMode   aMode = ECrCBC,       

            TPaddingRule  aPadRule = ECrPKCS1); 

        /**

        * Initialize encryption or decryption with RC2 algorithm.

        * @param aKey Key.

        * @param aIV Initialization vector.

        * @param aEncrypt Encrypt if true.

        * @param aEffectiveKeyLen Effective key length in bits

        * @param aMode Algorithm mode.

        * @param aPadRule Padding rule.

        * @return KCrCrypto | KCrUnknownMode

        *         KCrOK

        */

        TCrStatus InitCryptRC2L(

            const TDesC8& aKey,                 

            const TDesC8& aIV,                  

            TBool         aEncrypt = ETrue,     

            TInt          aEffectiveKeyLen = 0, 

            TCrSymmMode   aMode = ECrCBC,       

            TPaddingRule  aPadRule = ECrPKCS1); 

        /**

        * Initialize HMAC message digest algorithm.

        * @param aKey Key.

        * @param aDigestAlg Message digest algorithm that HMAC uses.

        * @return KCrCrypto | KCrUnknownMode

        *         KCrOK

        */

        TCrStatus InitDigestHMACL(

            const TDesC8& aKey,             

            TCrAlgorithm aDigestAlg);       

        /**

        * Initialize message digest with MD2 algorithm.

        * @param aAlgorithm      Digest algorithm

        * @return KCrOK or 

        *         KCrCrypto | KCrNotSupportedAlg

        */

        TCrStatus InitDigestL(TCrAlgorithm aAlgorithm);

        /**

        * Process given source data with initialized crypto operations.

        * If symmetric crypto is initialized appends to aTrg encrypted

        * or decrypted data without last portion. If only digest algorithm

        * is initialized, aTrg is not used.

        * @param aSrc Source buffer.

        * @param aTrg  Target buffer.

        * @return KCrOK

        *         KCrNotSupportedAlg

        *         KCrUndefinedLibrary

        *         KCrUnknownLibrary

        *         KCrUnknownMode

        */

        TCrStatus ProcessL(const TDesC8& aSrc, TDes8& aTrg);

        // Finalize symmetric algorithms. Function appends to aTrg

        // encrypted or decrypted last portion.

        TCrStatus FinalCryptL(TDes8& aTrg);

        // Finalize message digest algorithms. 

        // aTrg contains message digest of the data.

        TCrStatus FinalDigest(TDes8& aTrg);        

        // Derive key(s) or IV vector from password, salt and iteration count.

        TCrStatus DeriveKeyPKCS12L(

            const TDesC8& aPassword, 

            const TDesC8& aSalt,

            const TInt    aIterationCount,

            TCrAlgorithm  aHashFunc,

            const TUint8  aID,

            const TInt    aNumberOfBytes,

            TDes8&        aTrg);

    private: // Functions

        // Removes the last portion of the data when encrypting or decrypting.     

        TInt RemoveLastBlock(

            TDesC8&           aSrc,

            const TInt        aBlockSize,

            CCrAlgInfo*       algInfo);

        TInt MesDigestInputSizeL(TCrAlgorithm aDigestAlg);

        TInt MesDigestOutputSizeL(TCrAlgorithm aDigestAlg);

        void Reset();

    private: // Data.

        // Infos about initialized algorithms are collected in this array.

        CArrayPtrFlat<CCrAlgInfo>* iAlgorithmInfos;

    };

#endif // CR_CRYPTO_H

// End of File