Node.js

Generating Repeatable Random Data for Testing/Debugging

See more PRNG Examples

Demonstrates how to use the Fortuna PRNG to generate random-looking but repeatable non-random data for the purpose of testing and debugging. Node.js

NODEJS_PRELUDE

function chilkatExample() {

    var success = false;

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

    success = false;

    var fortuna = new chilkat.Prng();

    // Normally an application would seed the PRNG with entropy from
    // some real random source.  However, sometimes we want the same
    // random sequence of bytes for testing and debugging purposes.
    // This a reason why GetEntropy and AddEntropy are two different methods.
    // An application could omit the call to GetEntropy, and instead pass
    // non-random data to AddEntropy. For example:

    // Seed the PRNG with non-entropy, so we get a repeatable sequence.
    // Note: AddEntropy can be called any number of times.
    success = fortuna.AddEntropy("01020304","hex");
    success = fortuna.AddEntropy("hello world","ascii");

    // Generate some random data:
    var strRandHex = fortuna.GenRandom(16,"hex");
    var strRandBase64 = fortuna.GenRandom(22,"base64");
    var strRandBase58 = fortuna.GenRandom(32,"base58");

    console.log("hex random bytes: " + strRandHex);
    console.log("base64 random bytes: " + strRandBase64);
    console.log("base58 random bytes: " + strRandBase58);

    // Try it again with a different object to verify that the same results are obtained:
    var fortuna2 = new chilkat.Prng();

    success = fortuna2.AddEntropy("01020304","hex");
    success = fortuna2.AddEntropy("hello world","ascii");

    strRandHex = fortuna2.GenRandom(16,"hex");
    strRandBase64 = fortuna2.GenRandom(22,"base64");
    strRandBase58 = fortuna2.GenRandom(32,"base58");

    console.log("hex random bytes: " + strRandHex);
    console.log("base64 random bytes: " + strRandBase64);
    console.log("base58 random bytes: " + strRandBase58);

}

chilkatExample();