VB.NET

Generate TOTP using Base32 Secret (6 Digits, Time-based, 30-second period)

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Generates a 6-digit time-based TOTP code using a base32 secret with a 30-second time period. VB.NET

Dim success As Boolean = False

' This example requires the Chilkat API to have been previously unlocked.
' See Global Unlock Sample for sample code.
' 
Dim crypt As New Chilkat.Crypt2

' Base32 secret key:
Dim secretKey As String = "oebf ytfl qmzb p4xd 2ztf zyz4 hjrw 3uyo"

Dim sbKey As New Chilkat.StringBuilder
success = sbKey.Append(secretKey)

' Remove SPACE chars.
Dim numRemoved As Integer = sbKey.Replace(" ","")

' Note: A new token is generated every 30 seconds.  You must generate within the same 30 second interval to get the same result.

' Generate 6 digits.
Dim numDigits As Integer = 6
' 30 second time period.
Dim timePeriod As Integer = 30
Debug.WriteLine("Your token is: " & crypt.Totp(sbKey.GetAsString(),"base32","0","",timePeriod,numDigits,-1,"sha1"))