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 class for authentication with HMAC-SHA1 algorithm.

    15 *

    16 */

    17 

    18 

    19 

    20 

    21 #ifndef __SRTP_AUTHENTICATION_HMAC_SHA1_H__

    22 #define __SRTP_AUTHENTICATION_HMAC_SHA1_H__

    23 

    24 #include "msrtpauthentication.h"

    25 

    26 class CSRTPAuthentication_HMAC_SHA1 : public CBase, public MSRTPAuthentication

    27     {

    28     public:

    29         /**

    30         * Constructor.

    31         * @leave KErrNone if success, system-wide error code otherwise

    32         */

    33 	    static CSRTPAuthentication_HMAC_SHA1* NewL();

    34 

    35         /**

    36         * Constructor.

    37         * @leave KErrNone if success, system-wide error code otherwise

    38         */

    39 	    static CSRTPAuthentication_HMAC_SHA1* NewLC();

    40     

    41         /**

    42         * Destructor.

    43         */

    44 	    ~CSRTPAuthentication_HMAC_SHA1();

    45 

    46         /**

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

    48         * with the default algorith, HMAC-SHA1.

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

    50         * result IS truncated to n_tag leftmost bits

    51         * @param aBitLength  authentication tag length

    52         * @param aKey  authentication key (n_a)

    53         * @param aAuthPortion data to be integrity protected 

    54 	    * Returns HBufC8* authentication tag (n_tag truncated) 

    55         */

    56         HBufC8* AuthenticateL(TUint aBitLength,

    57                             const TDesC8& aKey, 

    58                             const TDesC8& aAuthPortion,

    59                             const TDesC8& aRoc);

    60                  

    61     private:         // methods

    62         /**

    63         * Default constructor.

    64         */

    65         CSRTPAuthentication_HMAC_SHA1();  

    66                 

    67         void ConstructL();          

    68     };

    69 

    70 #endif // __SRTP_AUTHENTICATION_HMAC_SHA1_H__

    71