B4X

Fortuna PRNG Generate Random Encoded

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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.) B4X

Dim success As Boolean = False

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

success = False

Dim fortuna As ChilkatPrng
fortuna.Initialize

'  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
    Log(fortuna.LastErrorText)
    Return
End If


'  Seed the PRNG with this entropy:
success = fortuna.AddEntropy(strEntropy, "hex")
If success <> True Then
    Log(fortuna.LastErrorText)
    Return
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")

Log("hex random bytes: " & strRandHex)
Log("base64 random bytes: " & strRandBase64)
Log("base58 random bytes: " & strRandBase58)