ykchalresp(1)						      General Commands Manual						     ykchalresp(1)

NAME

       ykchalresp - Perform challenge-response operation with YubiKey

SYNOPSIS

       ykchalresp [-1 | -2] [-H] [-Y] [-N] [-x] [-v] [-h]

OPTIONS

       Send  a challenge to a YubiKey, and read the response.  The YubiKey can be configured with two different C/R modes -- the standard one is a
       160 bits HMAC-SHA1, and the other is a YubiKey OTP mimicing mode, meaning two subsequent calls with the same challenge will result in  dif-
       ferent responses.

       -1     send the challenge to slot 1.  This is the default.

       -2     send the challenge to slot 2.

       -H     send a 64 byte HMAC challenge.  This is the default.

       -Y     send a 6 byte Yubico OTP challenge.

       -N     non-blocking mode -- abort if the YubiKey is configured to require a key press before sending the response.

       -x     challenge is hex encoded.

       -v     enable verbose mode.

EXAMPLE

       The YubiKey challenge-response operation can be demonstrated using the NIST PUB 198 A.2 test vector.

       First, program a YubiKey with the test vector :

	      $ ykpersonalize -2 -ochal-resp -ochal-hmac -ohmac-lt64 -a 303132333435363738393a3b3c3d3e3f40414243
	       ...
	      Commit? (y/n) [n]: y
	      $

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

	      $ ykchalresp -2 'Sample #2'
	      0922d3405faa3d194f82a45830737d5cc6c75d24
	      $

BUGS

       Report ykchalresp bugs in the issue tracker <https://github.com/Yubico/yubikey-personalization/issues>

SEE ALSO

       The ykpersonalize home page <http://code.google.com/p/yubikey-personalization/>

       YubiKeys can be obtained from Yubico <http://www.yubico.com/>.

yubikey-personalization 					   Febuary 2011 						     ykchalresp(1)