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<!DOCTYPE concept

  PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd">

<concept xml:lang="en" id="GUID-7D53E323-CF8D-5C4D-ABCD-4D95C7A4A5B5-GENID-1-12-1-26-1-1-9-1-12-1-8-1"><title>Secure store encryption example support code</title><prolog><metadata><keywords/></metadata></prolog><conbody><p>Below is the supporting code for the <xref href="GUID-36BCDD1F-3713-5DF0-8D8A-CF093694B636-GENID-1-12-1-26-1-1-9-1-12-1-7-1.dita">secure store example code</xref>. </p> <section id="GUID-5DE9A95D-C755-429A-A3E3-7A8FF06008B9-GENID-1-12-1-26-1-1-9-1-12-1-8-1-2-2"><title/><codeblock id="GUID-36F57493-4F6E-559A-B51B-7261F57AF1B1-GENID-1-12-1-26-1-1-9-1-12-1-8-1-2-2-2" xml:space="preserve">

#include "e32std.h"

#include "f32file.h"

#include "s32file.h"

#include "pbe.h"

#include "pbedata.h"

#include "s32crypt.h"

            </codeblock> <codeblock id="GUID-EE52D935-4E72-5D4A-809C-BA0FEE19C90F-GENID-1-12-1-26-1-1-9-1-12-1-8-1-2-2-3" xml:space="preserve">

/*

 * Class to demonstrate the use of secure store APIs.

 */

class CSecureStoreExample : public CBase

         {

public:

         static CSecureStoreExample* NewLC(const TDesC& aFilename);

         virtual ~CSecureStoreExample();

         void CreateNewStoreL(const TDesC& aPassword);

         TStreamId WriteEncryptedDataL(const TDesC8& aInput);

         void OpenExistingStoreL(const TDesC& aPassword);

         HBufC8* ReadEncryptedDataLC(TStreamId aStreamId);

         void CloseStore();

         void ChangePasswordL(const TDesC& aNewPassword);

private:

         CSecureStoreExample(const TDesC& aFilename);

         void ConstructL();

private:

         RFs iFs;

         const TDesC& iFilename;

         CPermanentFileStore* iFileStore;

         CPBEncryptSet* iEncryptSet;

         CSecureStore* iSecureStore;

         };

            </codeblock> <codeblock id="GUID-DB3DBE48-DCEC-5CDD-9066-246AD37A5C12-GENID-1-12-1-26-1-1-9-1-12-1-8-1-2-2-4" xml:space="preserve">

CSecureStoreExample* CSecureStoreExample::NewLC(const TDesC& aFilename)

         {

         CSecureStoreExample* self = new (ELeave) CSecureStoreExample(aFilename);

         CleanupStack::PushL(self);

         self->ConstructL();

         return self;

         }

CSecureStoreExample::CSecureStoreExample(const TDesC& aFilename)

         : iFilename(aFilename)

         {

         }

void CSecureStoreExample::ConstructL()

         {

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

         }

CSecureStoreExample::~CSecureStoreExample()

         {

         CloseStore();

         iFs.Close();

         }

            </codeblock> <codeblock id="GUID-4485993E-0561-5688-85FA-3914AECDF12B-GENID-1-12-1-26-1-1-9-1-12-1-8-1-2-2-5" xml:space="preserve">

LOCAL_D void RunPBEExampleL()

         {

         _LIT(KFilename, "c:\\pbe_example_data.dat");

         _LIT8(KInputData, "This is the data to be encrypted.");

         _LIT(KPassword, "pa55w0rd");

         _LIT(KNewPassword, "chang3m3");

         CSecureStoreExample* main = CSecureStoreExample::NewLC(KFilename);

         // Create a secure store and write some data to it

         main->CreateNewStoreL(KPassword);

         TStreamId streamId = main->WriteEncryptedDataL(KInputData);

         main->CloseStore();

         // Open it again, and read the data back out

         main->OpenExistingStoreL(KPassword);

         HBufC8* outputData = main->ReadEncryptedDataLC(streamId);

         ASSERT(*outputData == KInputData);

         CleanupStack::PopAndDestroy(outputData);

         // Change the password

         main->ChangePasswordL(KNewPassword);

         // Check we can still read the data

         outputData = main->ReadEncryptedDataLC(streamId);

         ASSERT(*outputData == KInputData);         

         main->CloseStore();

         CleanupStack::PopAndDestroy(2, main);

         }

            </codeblock> <codeblock id="GUID-7FF91AD3-106A-56EA-9199-0E261B8D044C-GENID-1-12-1-26-1-1-9-1-12-1-8-1-2-2-6" xml:space="preserve">

GLDEF_C TInt E32Main() // main function called by E32

    {

         __UHEAP_MARK;

         CTrapCleanup* cleanup = CTrapCleanup::New(); // get clean-up stack

         TRAPD(error, RunPBEExampleL());

         __ASSERT_ALWAYS(!error,User::Panic(_L("pbe_example_code"),error));

         delete cleanup; // destroy clean-up stack

         __UHEAP_MARKEND;

         return 0;

    }

            </codeblock> </section> </conbody></concept>