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VB.NET UWP/WinRT Examples

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(VB.NET UWP/WinRT) Fortuna PRNG Generate Random Encoded

Demonstrates how to generate random bytes using the Fortuna PRNG. The random bytes are returned in an encoded string (using an encoding such as hex, base64, base58, etc.)

Chilkat Universal Windows Platform (UWP) / WinRT Downloads

Chilkat for the Universal Windows Platform (UWP)

'  All Chilkat classes can be unlocked at once at the beginning of a program
'  by calling UnlockBundle.  It requires a Bundle unlock code.
Dim chilkatGlob As New Chilkat.Global
Dim success As Boolean = chilkatGlob.UnlockBundle("Anything for 30-day trial.")
If (success <> True) Then
    Debug.WriteLine(chilkatGlob.LastErrorText)
    Exit Sub
End If


Dim fortuna As New Chilkat.Prng

'  Before beginning to generate random data,
'  the PRNG (Pseudo Random Number Generator) should
'  be seeded with real random data (also known as "entropy").

'  Note: Accumulating real random data can be difficult
'  and time-consuming to collect.  It is for this reason
'  that pseudorandom data (i.e. a PRNG) is used.  The pseudorandom data generator
'  is seeded with entropy.  In addition, new entropy can (and should)
'  be periodically added as more pseudorandom data is generated.

'  Get 32 bytes of system entropy.  On Linux/Unix systems, this reads
'  from /dev/random.  On MS Windows systems, it uses the Crypto API's
'  CryptGenRandom function.
Dim strEntropy As String = fortuna.GetEntropy(32,"hex")
If (fortuna.LastMethodSuccess <> True) Then
    Debug.WriteLine(fortuna.LastErrorText)
    Exit Sub
End If


'  Seed the PRNG with this entropy:
success = fortuna.AddEntropy(strEntropy,"hex")
If (success <> True) Then
    Debug.WriteLine(fortuna.LastErrorText)
    Exit Sub
End If


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

Debug.WriteLine("hex random bytes: " & strRandHex)
Debug.WriteLine("base64 random bytes: " & strRandBase64)
Debug.WriteLine("base58 random bytes: " & strRandBase58)

 

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