Topic: Generate Google Authenticator OTPs with a TI89? - page 2. (Read 5683 times)
The programs are written in http://en.wikipedia.org/wiki/TI-BASIC so you need to find a programmer for that language. BUT you do want a device that has a good track of time, and I don't even know if a TI-89 can keep track of time let alone if it is the wrong time it would be completely wrong and the you will never get the correct number to enter.
Is this a dumb or uninteresting question? I just want a device that never goes online to generate my OTPs.
Psuedocode from wikipedia:
Would it be possible to write a program that generates google authenticator OTPs on a TI89? Would it be too difficult to sync the time? Would it take too long to generate the OTP?
Code:
function GoogleAuthenticatorCode(string secret)
key := base32decode(secret)
message := current Unix time ÷ 30
hash := HMAC-SHA1(key, message)
offset := last nibble of hash
truncatedHash := hash[offset..offset+4] //4 bytes starting at the offset
Set the first bit of truncatedHash to zero //remove the most significat bit
code := truncatedHash mod 1000000
pad code with 0 until length of code is 6
return code
Would it be possible to write a program that generates google authenticator OTPs on a TI89? Would it be too difficult to sync the time? Would it take too long to generate the OTP?
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