B4X
TOTP Authenticator: Duplicate Results of Online Tools

Duplicates the online tool for the Google 2FA Authenticator online tools at
Chilkat B4X Downloads

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'  This example requires the Chilkat API to have been previously unlocked.
'  See Global Unlock Sample for sample code.
'  
'  Note: This example was written on 7-March-2020.  If the online tools have since changed, the instructions provided here may no longer be valid.
'  

Dim crypt As ChilkatCrypt2
crypt.Initialize("crypt")

'  ---------------------------------------------------------------------------------------------
'  To duplicate the results of the Authenticator Test at https://rootprojects.org/authenticator/
'  do the following:
'  1) At the bottom of the screen you will see a URI such as:
'  
'     otpauth://totp/ACME%20Co:john@example.com?secret=HXDMVJECJJWSRB3HWIZR4IFUGFTMXBOZ&issuer=ACME%20Co&algorithm=SHA1&digits=6&period=30
'  
'     Use the uppercase secret.  For example:
Dim secretKey As String = "HXDMVJECJJWSRB3HWIZR4IFUGFTMXBOZ"

'  2) DO NOT cick the "Regenerate" button.  The regenerate button will generate a new secret.
'  
'  3) Run the following code to generate your 6-digit token.  Compare with the token shown in the picture of the iPhone at https://rootprojects.org/authenticator/
'       Note: A new token is generated every 30 seconds.  You must generate within the same 30 second interval to get the same result.
Log("Your token is: " & crypt.Totp(secretKey, "base32", "0", "", 30, 6, -1, "sha1"))


'  ---------------------------------------------------------------------------------------------
'  To duplicate the results of the Google2FA Playground at https://pragmarx.com/playground/google2fa#/
'  do the following:

'  1) Copy the 64-byte secret key:
secretKey = "OR2VQTRVHB2HO2LCGVWXQSCDK5ZHQS2D3THQ6UXO57XIE7ZHOWS6HDPQ622GU747"

'  2) Run the same code:
'     (Note: The online tool generates a new result every 30 seconds.  You must generate and compare within the same 30-second interval.)
Log("Your token is: " & crypt.Totp(secretKey, "base32", "0", "", 30, 6, -1, "sha1"))