Performing Cryptographic Operations with Keys

The following code snippet shows RSA signing operation:

//Create a file system session object
RFs iFs;
CleanupClosePushL(&iFs);


//Initialise the keystore and member functions
CUnifiedKeyStore* keyStore = CUnifiedKeyStore::NewL(fs);
keyStore->Initialize(iStatus); //iStatus is a TRequestStatus object


...



// Create a filter to retrieve all keys from the store
TCTKeyAttributeFilter filter;
filter.iPolicyFilter = TCTKeyAttributeFilter:EAllKeys;



// Retrieve a list of all the keys from the key store
RPointerArray<CCTKeyInfo> iKeys; // This variable will contain the key to be signed
iKeyStore->List(iKeys,filter,iStatus);


...


// Retrieve the key based on the label you are looking for 
_LIT(Klabel,”keylabel”);
TInt keyCount = iKeys.Count();
for (i = 0; i < keyCount; i++)
{
    CCTKeyInfo* keyInfo = iKeys[i];
    if (keyInfo->Label() == Klabel)
        {
            // Create a signer object for the key
            MRSASigner* iRSASigner
            // The signer object will be returned after the key has been opened for signing
            keyStore->Open(*keyInfo, iRSASigner, iStatus);
            break;
        }
}



// Perform the signing operation

// Define the data for signing

HBufC* dataToSign; 
dataToSign = HBufC::NewL(20);
_LIT(KTxtSign,"Data to be signed");
*dataToSign = KTxtSign; 


CRSASignature* iRSASignature;
// iRSASignature will contain the result after the completion
// of the following request

iRSASigner->SignMessage(*dataToSign, iRSASignature, iStatus);


...


// Retrieve the RSA signature value through the CRSASignature object 
TInt signature = iRSASignature->S();