Code invalid (not matching Google Auth)

[andresmurman]

Hi! I have a little problem. The code generated by ComputeTotp is different from the one shown in Google Authenticator.

I generate a base32 key like this (code in VB)

Dim secretKey As Byte() = KeyGeneration.GenerateRandomKey()

Dim base32String As String = Base32Encoding.ToString(secretKey )

I pass this base32String as secret to the QR I generate (I also tried entering the key manually, both generates the same random codes)

Then, when I try to validate the code, the generated code is different from the one in Google. Heres my code:

Dim secretKeyData As Byte() = Base32Encoding.ToBytes(secretKey)
Dim totp As New Totp(secretKeyData)
Dim validCode As String = totp.ComputeTotp()
'validCode is different from the one that appears on Google Authenticator

This is one of the keys that was randomly generated: 4FY2PLSR6WZ5V72YQS5SAE3VRPQRGWLQ

Any clue in what im doing wrong?

Thanks!

[andresmurman]

Well, my PC was 2 minutes ahead. Now everything is working...