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 authentication (integrity protection)

    15 *

    16 */

    17 

    18 

    19 

    20 

    21 #ifndef __MSRTP_AUTHENTICATION_H__

    22 #define __MSRTP_AUTHENTICATION_H__

    23 

    24 #include <e32base.h>

    25 

    26 class MSRTPAuthentication

    27     {

    28     public:

    29         /**

    30         * This function is called by SRTP for authentication/integrity protection

    31         * to create authentication tag regardless of the algorithm, 

    32         * the default algorith is HMAC-SHA1.

    33         * Produces authentication tag based on input key and data M.

    34         * result IS truncated to n_tag leftmost bits

    35         * @param aBitLength  authentication tag length, 32 or 80 bits

    36         * @param aKey  authentication key (n_a)

    37         * @param aAuthPortion data to be integrity protected 

    38         * @param aRoc packet ROC 

    39 	    * Returns HBufC8* authentication tag (untruncated) 

    40         */

    41         virtual HBufC8* AuthenticateL(TUint aBitLength,

    42                                     const TDesC8& aKey, 

    43                                     const TDesC8& aAuthPortion,

    44                                     const TDesC8& aRoc) = 0;

    45 

    46         virtual ~MSRTPAuthentication() { };                                

    47     };

    48 

    49 #endif // __MSRTP_AUTHENTICATION_H__