/*

* Copyright (c) 2008 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:  Base class for cipher algorithms which implements

 *                CSymmetricCipher.

 *

*/

#ifndef STSSYMMETRICCIPHER_H

#define STSSYMMETRICCIPHER_H

//  INCLUDES

#include <string>

#include <openssl/evp.h>

#include "stscipher.h"

using namespace std;

// CONSTANTS

class CSymmetricCipher;

class CBlockTransformation;

class CPadding;

namespace java

{

namespace satsa

{

// CLASS DECLARATION

/**

 *  Base class for cipher algorithms which implements CSymmetricCipher.

 *  For every algorithm key validity must be checked in the subclasses

 *  because initialization with wrong size key causes a panic.

 *

 */

class STSSymmetricCipher: public STSCipher

{

public:

    // Constructors and destructor

    /**

     * Destructor.

     */

    ~STSSymmetricCipher();

    static STSSymmetricCipher* Create(STSTransformation* aTransformation,

                                      int* errCode);

public:

    // Functions from STSCipher

    jint DoInit(JNIEnv* aJni, const TCipherMode aMode,

                const jstring aKeyAlgorithm, const jstring aKeyFormat,

                const jbyteArray aKeyEncoded, const jbyteArray aParams);

    jint DoFinal(JNIEnv* aJni, jbyteArray aInput, jint aInputOffset,

                 jint aInputLength, jbyteArray aOutput, jint aOutputOffset);

    jint Update(JNIEnv* aJni, jbyteArray aInput, jint aInputOffset,

                jint aInputLength, jbyteArray aOutput, jint aOutputOffset);

protected:

    /**

     * C++ default constructor.

     */

    STSSymmetricCipher();

    int Construct(STSTransformation* aTransformation);

private:

    // Provides symmetric cipher functionality.

    CSymmetricCipher* mCipher;

    // Bytes processed using Update method. Value is reset to 0 in Init

    // method.

    int mBytesProcessed;

    EVP_CIPHER_CTX *mCipherCtx;

    const EVP_CIPHER *mCipherType;

};

} // namespace satsa

} // namespace java

#endif // STSSYMMETRICCIPHER_H

// End of File