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<!DOCTYPE concept

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

<concept xml:lang="en" id="GUID-267D1E20-002E-53C7-8AE5-E063206C1562-GENID-1-12-1-26-1-1-11-1-1-6-1-5-1-6-1"><title>Secure stream encryption example support code</title><prolog><metadata><keywords/></metadata></prolog><conbody><p>Below is the supporting code for the <xref href="GUID-598B6698-3518-50CA-98DE-D85CB255BA2D-GENID-1-12-1-26-1-1-9-1-12-1-5-1.dita">secure stream example code</xref>. </p> <section id="GUID-77E39C51-FE08-4EEB-B94A-4ECD8104E1ED-GENID-1-12-1-26-1-1-11-1-1-6-1-5-1-6-1-2-2"><title/><codeblock id="GUID-02ECEC04-E291-51B3-86DF-2FB28347F5AD-GENID-1-12-1-26-1-1-11-1-1-6-1-5-1-6-1-2-2-2" 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-13A09565-981A-56C0-9AC7-B849FFBE7395-GENID-1-12-1-26-1-1-11-1-1-6-1-5-1-6-1-2-2-3" xml:space="preserve">

/*

 * Class to demonstrate the use of secure stream encryption APIs.

 */

class CSecureStreamExample : public CBase

         {

public:

         static CSecureStreamExample* NewLC();

         virtual ~CSecureStreamExample();

         void WriteEncryptedDataL(const TDesC8& aInput, const TDesC& aFilename, const TDesC& aPassword);

         HBufC8* ReadEncryptedDataLC(const TDesC& aFilename, const TDesC& aPassword);

private:

         CSecureStreamExample();

         void ConstructL();

private:

         RFs iFs;

         };

            </codeblock> <codeblock id="GUID-B23E19C7-F6AD-5CB4-A944-EFEDC45AB623-GENID-1-12-1-26-1-1-11-1-1-6-1-5-1-6-1-2-2-4" xml:space="preserve">

CSecureStreamExample* CSecureStreamExample::NewLC()

         {

         CSecureStreamExample* self = new (ELeave) CSecureStreamExample();

         CleanupStack::PushL(self);

         self->ConstructL();

         return self;

         }

CSecureStreamExample::CSecureStreamExample()

         {

         }

void CSecureStreamExample::ConstructL()

         {

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

         }

CSecureStreamExample::~CSecureStreamExample()

         {

         iFs.Close();

         }

            </codeblock> <codeblock id="GUID-11B8C0DD-AD05-53BB-BAD2-6F31457A2DD9-GENID-1-12-1-26-1-1-11-1-1-6-1-5-1-6-1-2-2-5" 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");

         CSecureStreamExample* main = CSecureStreamExample::NewLC();

         main->WriteEncryptedDataL(KInputData, KFilename, KPassword);

         HBufC8* outputData = main->ReadEncryptedDataLC(KFilename, KPassword);

         ASSERT(*outputData == KInputData);

         CleanupStack::PopAndDestroy(2, main);

         }

            </codeblock> <codeblock id="GUID-0B93114C-6801-5053-85C3-181779A6185F-GENID-1-12-1-26-1-1-11-1-1-6-1-5-1-6-1-2-2-6" 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>