1 /*

     2 * Copyright (c) 2004 Nokia Corporation and/or its subsidiary(-ies).

     3 * All rights reserved.

     4 * This component and the accompanying materials are made available

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

     6 * which accompanies this distribution, and is available

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

     8 *

     9 * Initial Contributors:

    10 * Nokia Corporation - initial contribution.

    11 *

    12 * Contributors:

    13 *

    14 * Description:    Provides an abstract class for key derivation operations

    15 *

    16 */

    17 

    18 

    19 

    20 

    21 #ifndef __MSRTP_KEYDERIVATION_H__

    22 #define __MSRTP_KEYDERIVATION_H__

    23 

    24 #include <e32base.h>

    25 

    26 class MSRTPKeyDerivation

    27     {

    28     public:

    29         /**

    30         * This function is called by SRTP for key derivation operation (PRF_n)

    31         * regardless of the algorithm, the default is AESCM-128

    32         * Produces key stream based on input key and IV value.

    33         * PRF_n function is used to derive session key from desired master key.

    34         * @param aBitLength Encryption key length

    35         * @param aKey  Input key.

    36         * @param aIV  Integer Value (IV).

    37 	    * Returns HBufC8* keystream 

    38         */        

    39         virtual HBufC8* PRF_128BitL(TUint aBitLength,

    40                                 const TDesC8& aKey, 

    41                                 const TDesC8& aIV) = 0;

    42                                 

    43         virtual ~MSRTPKeyDerivation() { };                                

    44     };

    45 

    46 #endif // __MSRTP_KEYDERIVATION_H__