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<concept xml:lang="en" id="GUID-7D53E323-CF8D-5C4D-ABCD-4D95C7A4A5B5"><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.dita">secure store example code</xref>. </p> <section id="GUID-5DE9A95D-C755-429A-A3E3-7A8FF06008B9"><title/><codeblock id="GUID-36F57493-4F6E-559A-B51B-7261F57AF1B1" 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" xml:space="preserve">
/*
 * Class to demonstrate the use of secure store APIs.
 */
class CSecureStoreExample : public CBase
         {
public:
         static CSecureStoreExample* NewLC(const TDesC&amp; aFilename);
         virtual ~CSecureStoreExample();

         void CreateNewStoreL(const TDesC&amp; aPassword);
         TStreamId WriteEncryptedDataL(const TDesC8&amp; aInput);
         void OpenExistingStoreL(const TDesC&amp; aPassword);
         HBufC8* ReadEncryptedDataLC(TStreamId aStreamId);
         void CloseStore();
         void ChangePasswordL(const TDesC&amp; aNewPassword);
private:
         CSecureStoreExample(const TDesC&amp; aFilename);
         void ConstructL();
private:
         RFs iFs;
         const TDesC&amp; iFilename;
         CPermanentFileStore* iFileStore;
         CPBEncryptSet* iEncryptSet;
         CSecureStore* iSecureStore;
         };
            </codeblock> <codeblock id="GUID-DB3DBE48-DCEC-5CDD-9066-246AD37A5C12" xml:space="preserve">
CSecureStoreExample* CSecureStoreExample::NewLC(const TDesC&amp; aFilename)
         {
         CSecureStoreExample* self = new (ELeave) CSecureStoreExample(aFilename);
         CleanupStack::PushL(self);
         self-&gt;ConstructL();
         return self;
         }

CSecureStoreExample::CSecureStoreExample(const TDesC&amp; aFilename)
         : iFilename(aFilename)
         {
         }

void CSecureStoreExample::ConstructL()
         {
         User::LeaveIfError(iFs.Connect());
         }

CSecureStoreExample::~CSecureStoreExample()
         {
         CloseStore();
         iFs.Close();
         }
            </codeblock> <codeblock id="GUID-4485993E-0561-5688-85FA-3914AECDF12B" 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-&gt;CreateNewStoreL(KPassword);
         TStreamId streamId = main-&gt;WriteEncryptedDataL(KInputData);
         main-&gt;CloseStore();

         // Open it again, and read the data back out
         main-&gt;OpenExistingStoreL(KPassword);
         HBufC8* outputData = main-&gt;ReadEncryptedDataLC(streamId);
         ASSERT(*outputData == KInputData);
         CleanupStack::PopAndDestroy(outputData);

         // Change the password
         main-&gt;ChangePasswordL(KNewPassword);

         // Check we can still read the data
         outputData = main-&gt;ReadEncryptedDataLC(streamId);
         ASSERT(*outputData == KInputData);         
         main-&gt;CloseStore();

         CleanupStack::PopAndDestroy(2, main);
         }
            </codeblock> <codeblock id="GUID-7FF91AD3-106A-56EA-9199-0E261B8D044C" 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>