ROTP - The Ruby One Time Password Library
Dependencies
- OpenSSL
- Base32
Installation
gem install rotp
Use
Time based OTP's
totp = ROTP::TOTP.new("base32secret1234")
totp.now # => 492039
totp.at(Time.now.to_i + 30) # => 102922
Counter based OTP's
hotp = ROTP::HOTP.new("base32secretkey1234")
hotp.at(0) # => 368431
hotp.at(1) # => 818794
hotp.at(1401) # => 320657
Generating a Base32 Secret key
ROTP.random_base32 # returns a 16 character base32 secret. Compatible with Google Authenticator
Google Authenticator Interop
The library works with the Google Authenticator iPhone and Android app, and also includes the ability to generate provisioning URI's for use with the QR Code scanner built into the app.
hotp.provisioning_uri # => 'otpauth://totp/[email protected]?secret=JBSWY3DPEHPK3PXP'
This can then be rendered as a QR Code which can then be scanned and added to the users list of OTP credentials.