(Classic ASP) Google Authenticator Algorithm
Example code implementing the Google Authenticator algorithm.
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
</head>
<body>
<%
' This example assumes the Chilkat API to have been previously unlocked.
' See Global Unlock Sample for sample code.
' Generating TOTP Base32 Secret:
' When you enable 2FA with a TOTP-based authenticator app, Google will provide you with a QR code
' that you can scan using the app. This QR code contains a TOTP base32 secret.
' You can also choose to view and copy the secret manually.
secretBase32 = "JBSWY3DPEHPK3PXP"
' Do the following to calculate the 6-digit decimal Google authenticator token for a base32 secret,
' given the current system date/time.
set crypt = Server.CreateObject("Chilkat_9_5_0.Crypt2")
otp = crypt.Totp(secretBase32,"base32","0","",30,6,-1,"sha1")
Response.Write "<pre>" & Server.HTMLEncode( "6-digit decimal token = " & otp) & "</pre>"
%>
</body>
</html>
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