X99TOKEN(1) OpenBSD Reference Manual X99TOKEN(1)NAME
x99token - X9.9 software token calculator
SYNOPSIS
x99token [-d] [-k keyfile] [-n count]
x99token -i [-k keyfile]
DESCRIPTION
The x99token program is a simple X9.9 software token calculator. The
token is initialized by using the -i option. In this mode, x99token
requests a key. The key consists of 8 bytes encoded in either hex or
octal. When encoded in hex the key must consist of 16 hex digits, no
spaces (e.g., "0123456789abcdef"). When encoded in octal the key must
consist of 8 3-digit octets, each separated by exactly one space (e.g.,
"001 010 100 002 020 200 003 030"). Once the key is entered, a PIN
number is requested. The PIN number is used to perturb the key before it
is stored in a keyfile. This perturbation is not terribly secure. You
should assume that anyone with access to your keyfile will also have
access to your key.
When -i is not specified, x99token is in calculator mode. In this mode
you must enter the same PIN as used in the initialization step. The PIN
is used to decode the key read from the keyfile. Next you enter the
challenge you have been presented with. The x99token program will
provide you with a response to the challenge. If the -d option is used,
the response will fold any hex digits to decimal. If a count is
specified by -n, it indicates the number of challenges to predict. The
first challenge is always the entered challenge. By default the value of
count is 1, which implies only the entered challenge is resolved.
Future challenges are predicted by the following algorithm:
o Encrypt the current challenge with the shared secret key
o AND each byte of the response with 0x0f
o Modulo each byte by 10 (0x0a)
o ADD 0x30 (ASCII value of '0') to each byte
The resulting 8 bytes are all ASCII decimal digits and are the predicted
challenge. This process may be repeated.
FILES
$HOME/.keyfile.des default keyfile
SEE ALSOtokenadm(8), tokeninit(8)AUTHORS
Paul Borman <prb@krystal.com>
CAVEATS
This is a very simple-minded program. The keyfile should be placed on a
floppy disk which is kept physically secure.
Having not read the X9.9 standard, this may not be a complete or accurate
implementation of the standard. This software is provided AS IS with no
express or implied warranty.
OpenBSD 4.9 May 31, 2007 OpenBSD 4.9