Objective-C

Adding Entropy to a PRNG

See more PRNG Examples

Demonstrates how system entropy is automatically added when the application does not explicitly add entropy prior to generating the 1st random data. Also demonstrates how additional entropy can be added at anytime during the lifetime of the PRNG object. Objective-C

#import <CkoPrng.h>

BOOL success = NO;

// This example assumes the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

success = NO;

CkoPrng *fortuna = 0;

//  The simplest way to use the Chilkat PRNG is to instantiate the object
//  and generate random data.  This skips the explicit step of getting system entropy
//  and adding it (via get AddEntropy method).  When no entropy is explicitly added,
//  Chilkat will automatically add 32-bytes of system entropy on the first request
//  for random data.

//  Generate some random data.
//  The 1st call to GenRandom implicitly adds 32 bytes of system entropy to seed the PRNG.
NSLog(@"%@",[fortuna GenRandom: [NSNumber numberWithInt: 16] encoding: @"hex"]);

//  Note: An application can get additional system entropy and add it at any point
//  during the lifetime of the PRNG.  For example:
NSLog(@"%@",[fortuna GenRandom: [NSNumber numberWithInt: 16] encoding: @"hex"]);
NSLog(@"%@",[fortuna GenRandom: [NSNumber numberWithInt: 16] encoding: @"hex"]);
NSLog(@"%@",[fortuna GenRandom: [NSNumber numberWithInt: 16] encoding: @"hex"]);
success = [fortuna AddEntropy: [fortuna GetEntropy: [NSNumber numberWithInt: 16] encoding: @"hex"] encoding: @"hex"];
NSLog(@"%@",[fortuna GenRandom: [NSNumber numberWithInt: 16] encoding: @"hex"]);
NSLog(@"%@",[fortuna GenRandom: [NSNumber numberWithInt: 16] encoding: @"hex"]);
NSLog(@"%@",[fortuna GenRandom: [NSNumber numberWithInt: 16] encoding: @"hex"]);
success = [fortuna AddEntropy: [fortuna GetEntropy: [NSNumber numberWithInt: 16] encoding: @"hex"] encoding: @"hex"];
NSLog(@"%@",[fortuna GenRandom: [NSNumber numberWithInt: 16] encoding: @"hex"]);
NSLog(@"%@",[fortuna GenRandom: [NSNumber numberWithInt: 16] encoding: @"hex"]);
NSLog(@"%@",[fortuna GenRandom: [NSNumber numberWithInt: 16] encoding: @"hex"]);
success = [fortuna AddEntropy: [fortuna GetEntropy: [NSNumber numberWithInt: 16] encoding: @"hex"] encoding: @"hex"];
NSLog(@"%@",[fortuna GenRandom: [NSNumber numberWithInt: 16] encoding: @"hex"]);
NSLog(@"%@",[fortuna GenRandom: [NSNumber numberWithInt: 16] encoding: @"hex"]);
NSLog(@"%@",[fortuna GenRandom: [NSNumber numberWithInt: 16] encoding: @"hex"]);