Generating Random Bytes

Procedure

1. Create a CRandom object.

2. Use the GenerateRandomBytesL() function to generate cryptographically secure random data. A call to this function fills the provided buffer up to its current length, discarding any data that it may contain.

This example shows how the CRandom::GenerateRandomBytesL() method is used to populate a descriptor with a series of random bytes.

...
using namespace CryptoSpi;

//Create a pointer to store the factory-generated random implementation object
CRandom* randomImpl = NULL;

//Calling the CreateRandomL() method of the random factory class 
//creates a new CRandom object    
CRandomFactory::CreateRandomL(randomImpl, KRandomUid, NULL);

CleanupStack::PushL(randomImpl);
//Create an 8 bit descriptor 50 bytes long with a max length of 50 bytes
TBuf8<50> randomStr(50);
 
//Passing the 8 bit descriptor to the CRandom::GenerateRandomBytesL() 
//method fills it with random bytes. If there is no memory available  
//or any problems occur, the method may leave.    
randomImpl->GenerateRandomBytesL(randomStr); 
   
//Destroy the random implementation object    
CleanupStack::PopAndDestroy(randomImpl);