yubikey-totp - Produce an OATH TOTP code using a YubiKey

       Report yubikey-totp bugs in the issue tracker ⟨https://github.com/Yubico/python-yubico/issues/⟩.

       OATH  codes are one time passwords (OTP) calculated in a standardized way. While the YubiKey is primarily
       used with Yubico OTP's, the YubiKey is also capable of producing OATH codes.

       OATH generally comes in two flavors -- event based (called HOTP) and time based (called TOTP).  Since the
       YubiKey does not contain a battery, it cannot keep track of the current time itself and therefor a helper
       application such as yubikey-totp is required to effectively send the current time to the  YubiKey,  which
       can then perform the cryptographic calculation needed to produce the OATH code.

       Through  the  use  of  a  helper  application,  such  as yubikey-totp, the YubiKey can be used with sites
       offering OATH TOTP authentication, such as Google GMail.

       The YubiKey OATH TOTP operation can be demonstrated using the RFC6238  test  key  "12345678901234567890"
       (ASCII).

       First, program a YubiKey for HMAC-SHA1 Challenge-Response operation with the test vector HMAC key :

              $ ykpersonalize-2-ochal-resp-ochal-hmac-ohmac-lt64-oserial-api-visible\-a3132333435363738393031323334353637383930

       Now, send the NIST test challenge to the YubiKey and verify the result matches the expected :

              $ yubikey-totp--step30--digits8--time1111111109
              07081804
              $

       yubikey-totp - Produce an OATH TOTP code using a YubiKey

-v     enable verbose mode.

       -h     show help

       --time specify the time value to use (in seconds since epoch)

       --step how frequent codes change in your system - typically 30 or 60 seconds

       --digits
              digits in OATH code - typically 6

       --slot YubiKey slot to use - default 2

       --debug
              enable debug output

       YubiKeys can be obtained from Yubico ⟨http://www.yubico.com/⟩.

python-yubico                                       June 2012                                    yubikey-totp(1)

yubikey-totp [-v] [-h] [--time | --step] [--digits] [--slot] [--debug]