PowerShell

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. PowerShell

Add-Type -Path "C:\chilkat\ChilkatDotNet47-x64\ChilkatDotNet47.dll"

$success = $false

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

$success = $false

$fortuna = New-Object 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:
$strRandHex = $fortuna.GenRandom(16,"hex")
$strRandBase64 = $fortuna.GenRandom(22,"base64")
$strRandBase58 = $fortuna.GenRandom(32,"base58")

$("hex random bytes: " + $strRandHex)
$("base64 random bytes: " + $strRandBase64)
$("base58 random bytes: " + $strRandBase58)

# Try it again with a different object to verify that the same results are obtained:
$fortuna2 = New-Object 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")

$("hex random bytes: " + $strRandHex)
$("base64 random bytes: " + $strRandBase64)
$("base58 random bytes: " + $strRandBase58)