Xojo Plugin

Generating Repeatable Random Data for Testing/Debugging

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

Dim success As Boolean
success = False

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

success = False

Dim fortuna As 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:
Dim strRandHex As String
strRandHex = fortuna.GenRandom(16,"hex")
Dim strRandBase64 As String
strRandBase64 = fortuna.GenRandom(22,"base64")
Dim strRandBase58 As String
strRandBase58 = fortuna.GenRandom(32,"base58")

System.DebugLog("hex random bytes: " + strRandHex)
System.DebugLog("base64 random bytes: " + strRandBase64)
System.DebugLog("base58 random bytes: " + strRandBase58)

// Try it again with a different object to verify that the same results are obtained:
Dim fortuna2 As 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")

System.DebugLog("hex random bytes: " + strRandHex)
System.DebugLog("base64 random bytes: " + strRandBase64)
System.DebugLog("base58 random bytes: " + strRandBase58)