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:  Encryption/Decryption support functions

    15 *

    16 */

    17 

    18 

    19 // INCLUDE FILES

    20 #include <e32std.h>

    21 #include <e32base.h>

    22 #include <e32math.h>

    23 #include <s32buf.h>

    24 #include <s32crypt.h>

    25 

    26 #include "LMSecurity.h"

    27 #include "LMSecurityEncrypt.h"

    28 

    29 // ============================ MEMBER FUNCTIONS ===============================

    30 

    31 // -----------------------------------------------------------------------------

    32 // CLMSecurityEncrypt::CLMSecurityEncrypt

    33 // Initialize the random key stream from a constant

    34 // -----------------------------------------------------------------------------

    35 //

    36 CLMSecurityEncrypt::CLMSecurityEncrypt(

    37     const TDesC8& init)

    38     {

    39     TPckg<TUint> p(0);

    40 

    41     p.Copy(init);

    42     iKey = p();

    43     Math::Rand(iKey);

    44     }

    45 

    46 // -----------------------------------------------------------------------------

    47 // CLMSecurityEncrypt::EncryptL

    48 // Encrypt using the key stream

    49 // -----------------------------------------------------------------------------

    50 //

    51 TInt CLMSecurityEncrypt::EncryptL(

    52     TDes8& aOutput,

    53     const TDesC8& aInput)

    54     {

    55     TInt i;

    56     TUint8* ptr;

    57 

    58     ptr = const_cast<TUint8*>(aOutput.Ptr());

    59     for (i = 0; i < aInput.Size(); i++)

    60         {

    61         ptr[i] = static_cast<TUint8>(aInput[i] ^ Math::Rand(iKey));

    62         }

    63     aOutput.SetLength(aInput.Size());

    64     return aInput.Size();

    65     }

    66 

    67 // -----------------------------------------------------------------------------

    68 // CLMSecurityEncrypt::CompleteL

    69 // Final encryption

    70 // -----------------------------------------------------------------------------

    71 //

    72 TInt CLMSecurityEncrypt::CompleteL(

    73     TDes8& aOutput,

    74     const TDesC8& aInput)

    75     {

    76     return EncryptL(aOutput, aInput);

    77     }