/*

* Copyright (c) 2002, 2003 Nokia Corporation and/or its subsidiary(-ies).

* All rights reserved.

* This component and the accompanying materials are made available

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

* which accompanies this distribution, and is available

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

*

* Initial Contributors:

* Nokia Corporation - initial contribution.

*

* Contributors:

*

* Description:  Implementation of the DRM access functions that are available

*                to authenticated clients.

*

*/

// INCLUDE FILES

#include <e32base.h>

#include <e32std.h>

#include <e32math.h>

#include <e32test.h>

#include <f32file.h>

#include <s32file.h>

#include <s32mem.h>

#include <apmstd.h>

#include <symmetric.h>

#include "Oma1DcfCreator.h"

#include "DRMRightsClient.h"

#include "DrmPermission.h"

#include "DrmConstraint.h"

#include "DRMCommon.h"

#include "DrmKeyStorage.h"

// EXTERNAL DATA STRUCTURES

// EXTERNAL FUNCTION PROTOTYPES

// CONSTANTS

static const TInt KMaxEncryptionSize = 2048;

// MACROS

// LOCAL CONSTANTS AND MACROS

_LIT8(KLDContentURI, "ldf:31415926535@localhost");

_LIT8(KLDFHeader, "Encryption-Method:AES128CBC;padding=RFC2630\x0d\x0a");

// ============================= LOCAL FUNCTIONS ===============================

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

// -----------------------------------------------------------------------------

// COma1DcfCreator::COma1DcfCreator

// C++ default constructor can NOT contain any code, that

// might leave.

// -----------------------------------------------------------------------------

EXPORT_C COma1DcfCreator::COma1DcfCreator(void)

    {

    iEncryptionStream = NULL;

    iEncryptionBuffer = NULL;

    }

// -----------------------------------------------------------------------------

// COma1DcfCreator::ConstructL

// Symbian 2nd phase constructor can leave.

// -----------------------------------------------------------------------------

//

EXPORT_C void COma1DcfCreator::ConstructL()

    {

    iEncryptionBuffer = HBufC8::NewL(KMaxEncryptionSize);

    }

// -----------------------------------------------------------------------------

// COma1DcfCreator::NewL

// Two-phased constructor.

// -----------------------------------------------------------------------------

EXPORT_C COma1DcfCreator* COma1DcfCreator::NewL()

    {

    COma1DcfCreator* self = new COma1DcfCreator();

    User::LeaveIfNull(self);

    CleanupStack::PushL(self);

    self->ConstructL();

    CleanupStack::Pop();

    return self;

    }

// Destructor

EXPORT_C COma1DcfCreator::~COma1DcfCreator()

    {

    delete iEncryptionBuffer;

    iRdb.Close();

    }

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

// -----------------------------------------------------------------------------

// COma1DcfCreator::

//

// -----------------------------------------------------------------------------

EXPORT_C void COma1DcfCreator::EncryptInitializeL(

    RWriteStream& anOutput,

    const TDesC8& aMIMEType,

    CDRMRights* aRightsObject)

    {

    const TUint KVersion = 1;

    CDRMPermission *rights = CDRMPermission::NewLC();

    TInt err = 0;

    TDRMUniqueID id = 0;

    TBuf8<KDCFKeySize> key;

    TPtrC8 uri(0, 0);

    User::LeaveIfError(iRdb.Connect());

    iBytesWritten = 0;

    // generate rights

    if (aRightsObject)

        {

        uri.Set(aRightsObject->GetAsset().iUid->Des());

        err = iRdb.InitializeKey(uri);

        if (err == KErrCANoRights)

            {

            key.SetLength(KDCFKeySize);

            iRdb.GetRandomDataL(key);

            User::LeaveIfError(iRdb.AddRecord(key, aRightsObject->GetPermission(),

                uri, id));

            User::LeaveIfError(iRdb.InitializeKey(uri));

            }

        else

            {

            User::LeaveIfError(err);

            }

        }

    else

        {

        uri.Set(KLDContentURI);

        err = iRdb.InitializeKey(uri);

        if (err == KErrCANoRights)

            {

            rights->iAvailableRights = ERightsAll;

            rights->iTopLevel->iActiveConstraints = EConstraintNone;

            rights->iPlay->iActiveConstraints = EConstraintNone;

            rights->iDisplay->iActiveConstraints = EConstraintNone;

            rights->iPrint->iActiveConstraints = EConstraintNone;

            rights->iExecute->iActiveConstraints = EConstraintNone;

            rights->iUniqueID = 0;

            key.SetLength(KDCFKeySize);

            iRdb.GetRandomDataL(key);

            User::LeaveIfError(iRdb.AddRecord(key, *rights, uri, id));

            User::LeaveIfError(iRdb.InitializeKey(uri));

            }

        else

            {

            User::LeaveIfError(err);

            }

        }

    iIv.SetLength(KDCFKeySize);

    iRdb.GetRandomDataL(iIv);

    iEncryptionStream = &anOutput;

    anOutput.WriteUint8L(KVersion);

    anOutput.WriteUint8L(aMIMEType.Length());

    anOutput.WriteUint8L(uri.Length());

    anOutput.WriteL(aMIMEType);

    anOutput.WriteL(uri);

    anOutput.WriteUint8L(KLDFHeader().Size());

    anOutput.WriteUint8L(0);

    anOutput.WriteL(KLDFHeader);

    anOutput.WriteL(iIv);

    anOutput.CommitL();

    iBytesWritten += 3 + aMIMEType.Size() + 2 + KLDFHeader().Size() +

        iIv.Size();

    CleanupStack::PopAndDestroy(); // rights

    }

// -----------------------------------------------------------------------------

// COma1DcfCreator::EncryptUpdateL

// update the encryption

// -----------------------------------------------------------------------------

EXPORT_C void COma1DcfCreator::EncryptUpdateL(const TDesC8& aMessageData)

    {

    TInt i;

    TInt n;

    TInt size;

    TPtr8 ptr(iEncryptionBuffer->Des());

    TPtrC8 data;

    data.Set(aMessageData);

    if (iRemainder.Size() > 0 && iRemainder.Size() + data.Size() >= KDCFKeySize)

        {

        ptr.Copy(iRemainder);

        n = Min(KDCFKeySize - iRemainder.Size(), data.Size());

        ptr.Append(data.Left(n));

        iRdb.Encrypt(iIv, ptr);

        iEncryptionStream->WriteL(ptr);

        iBytesWritten += ptr.Size();

        iIv.Copy(ptr.Right(KDCFKeySize));

        data.Set(data.Right(data.Size() - n));

        iRemainder.SetLength(0);

        }

    size = data.Size();

    for (i = 0; size > KDCFKeySize; i += KMaxEncryptionSize)

        {

        n = Min(KMaxEncryptionSize, ((size / KDCFKeySize) * KDCFKeySize));

        ptr.Copy(data.Mid(i, n));

        iRdb.Encrypt(iIv, ptr);

        iEncryptionStream->WriteL(ptr);

        iBytesWritten += ptr.Size();

        iIv.Copy(ptr.Right(KDCFKeySize));

        size -= n;

        }

    iRemainder.Append(data.Right(size));

    }

// -----------------------------------------------------------------------------

// COma1DcfCreator::EncryptFinalizeL

// finalize the encryption

// -----------------------------------------------------------------------------

EXPORT_C void COma1DcfCreator::EncryptFinalizeL()

    {

    TPtr8 ptr(iEncryptionBuffer->Des());

    ptr.Copy(iRemainder);

    iRdb.Encrypt(iIv, ptr, ETrue);

    iEncryptionStream->WriteL(ptr);

    iEncryptionStream->CommitL();

    iBytesWritten += ptr.Size();

    iRdb.Close();

    }

// -----------------------------------------------------------------------------

// COma1DcfCreator::EncryptContent

// Encrypt plain content to a DCF. Replaces the input buffer with the plain

// content with the DCF.

// -----------------------------------------------------------------------------

EXPORT_C void COma1DcfCreator::EncryptContentL(

    HBufC8*& aContent,

    const TDesC8& aMIMEType,

    CDRMRights* aRightsObject)

    {

    RMemWriteStream output;

    TAny* buffer;

    TInt size;

    size = aContent->Length() +

        aMIMEType.Length() +

        KLDContentURI().Length() +

        KLDFHeader().Length() + 256;

    buffer = User::Alloc(size);

    User::LeaveIfNull(buffer);

    CleanupStack::PushL(buffer);

    output.Open(buffer, size);

    CleanupClosePushL(output);

    EncryptInitializeL(output, aMIMEType, aRightsObject);

    EncryptUpdateL(*aContent);

    EncryptFinalizeL();

    delete aContent;

    aContent = HBufC8::NewMax(size);

    User::LeaveIfNull(aContent);

    size = iBytesWritten;

    *aContent = TPtr8(static_cast<TUint8*>(buffer), size, size);

    CleanupStack::PopAndDestroy(2); // output, buffer

    }

// -----------------------------------------------------------------------------

// COma1DcfCreator::EncryptFileL

// Turn a plain content file into a DCF.

// -----------------------------------------------------------------------------

EXPORT_C void COma1DcfCreator::EncryptFileL(

    const TDesC& aFileName,

    const TDesC& aDCFFileName,

    const TDesC8& aMIMEType,

    CDRMRights* aRightsObject)

    {

    TInt r = KErrNone;

    RFs fs;

    RFile input;

    RFileWriteStream output;

    HBufC8* buf = HBufC8::NewLC(8000);

    TPtr8 buffer(const_cast<TUint8*>(buf->Ptr()),0,8000);

    User::LeaveIfError(fs.Connect());

    CleanupClosePushL(fs);

    r = input.Open(fs, aFileName, EFileRead|EFileShareReadersOrWriters);

    if(r == KErrInUse)

        {

        r = input.Open(fs, aFileName, EFileRead | EFileShareAny);

        if(r == KErrInUse)

            {

            User::LeaveIfError(input.Open(fs, aFileName, EFileRead |

                                                         EFileShareReadersOnly));

            r = KErrNone;

            }

        }

    User::LeaveIfError( r );

    CleanupClosePushL(input);

    User::LeaveIfError(output.Replace(fs, aDCFFileName, EFileWrite));

    CleanupClosePushL(output);

    EncryptInitializeL(output, aMIMEType, aRightsObject);

    do

        {

        input.Read(buffer, buffer.MaxSize());

        if (buffer.Size() > 0)

            {

            EncryptUpdateL(buffer);

            }

        }

    while (buffer.Size() > 0);

    EncryptFinalizeL();

    CleanupStack::PopAndDestroy(4); // output, input, fs, buf

    }

// -----------------------------------------------------------------------------

// COma1DcfCreator::EncryptContentToFile

// Encrypt plain content to a DCF and stores it in a file.

// -----------------------------------------------------------------------------

EXPORT_C void COma1DcfCreator::EncryptContentToFileL(

    const TDesC8& aContent,

    const TDesC& aFileName,

    const TDesC8& aMIMEType,

    CDRMRights* aRightsObject)

    {

    RFs fs;

    RFileWriteStream output;

    User::LeaveIfError(fs.Connect());

    CleanupClosePushL(fs);

    fs.Delete(aFileName);

    User::LeaveIfError(output.Create(fs, aFileName, EFileWrite));

    CleanupClosePushL(output);

    EncryptInitializeL(output, aMIMEType, aRightsObject);

    EncryptUpdateL(aContent);

    EncryptFinalizeL();

    CleanupStack::PopAndDestroy(2); // output, fs

    }

// End of File