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 AES CM 128 bit key derivation

    15 *

    16 */

    17 

    18 

    19 

    20 

    21 #ifndef __SRTP_KEYDERIVATION_AESCM128_H__

    22 #define __SRTP_KEYDERIVATION_AESCM128_H__

    23 

    24 #include "msrtpkeyderivation.h"

    25 

    26 //FORWARD declarations

    27 class CSrtpAESCTRCrypto;

    28 

    29 class CSRTPKeyDerivation_AESCM128 : public CBase, public MSRTPKeyDerivation

    30     {

    31     public:

    32         /**

    33         * Constructor.

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

    35         */

    36 	    static CSRTPKeyDerivation_AESCM128* NewL();

    37 

    38         /**

    39         * Constructor.

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

    41         */

    42 	    static CSRTPKeyDerivation_AESCM128* NewLC();

    43 

    44         /**

    45         * Destructor.

    46         */

    47 	    ~CSRTPKeyDerivation_AESCM128();

    48 

    49         /**

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

    51         * with the default algorithm AESCM-128

    52         * Produces keystream based on input key and IV value.

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

    54         * @param aBitLength  bit length of the key.

    55         * @param aKey  Input key.

    56         * @param aIV  Integer Value (IV).

    57 	    * Returns HBufC8* keystream 

    58         */

    59         HBufC8* PRF_128BitL(TUint aBitLength, 

    60                          const TDesC8& aKey, 

    61                          const TDesC8& aIV);

    62                                 

    63                                 

    64     private:         // Data        

    65 	    CSrtpAESCTRCrypto* iEncryptor;	    

    66                  

    67     private:         // methods

    68         /**

    69         * Default constructor.

    70         */

    71         CSRTPKeyDerivation_AESCM128();  

    72                 

    73         void ConstructL();  

    74     };

    75 

    76 #endif // __SRTP_KEYDERIVATION_AESCM128_H__

    77 

    78 

    79     

    80 

    81