srptool(1)

NAME
*[B-Font]srptool - GnuTLS SRP tool

SYNOPSIS
*[B-Font]srptool [*[B-Font]-flags] [*[B-Font]-flag [*[I-Font]value]] [*[B-Font]--option-name[[=| ]*[I-Font]value]]

All arguments must be options.

DESCRIPTION
Simple program that emulates the programs in the Stanford SRP (Secure Remote Password) libraries using GnuTLS. It is intended for use in places where you don't expect SRP authentication to be the used for system users.

In brief, to use SRP you need to create two files. These are the password file that holds the users and the verifiers associated with them and the configuration file to hold the group parameters (called tpasswd.conf).

OPTIONS

Enable debugging.
    This option takes an integer number as its argument. The value of *[I-Font]num is constrained to being:
    in the range 0 through 9999

    Specifies the debug level.

This option takes an integer number as its argument.
    The default *[I-Font]number for this option is:
     3

This option takes an integer number as its argument.

Verifies the password provided against the password file.

Specify a filename or a PKCS #11 URL to read the CAs from.

Generate a password configuration file.

    This generates a password configuration file (tpasswd.conf) containing the required for TLS parameters.

Output version of program and exit.  The default mode is `v', a simple
    version. The `c' mode will print copyright information and `n' will print the full copyright notice.

Display usage information and exit.

Pass the extended usage information through a pager.

EXAMPLES
To create tpasswd.conf which holds the g and n values for SRP protocol (generator and a large prime), run:
$ srptool --create-conf /etc/tpasswd.conf

This command will create /etc/tpasswd and will add user 'test' (you will also be prompted for a password). Verifiers are stored by default in the way libsrp expects.
$ srptool --passwd /etc/tpasswd --passwd-conf /etc/tpasswd.conf -u test

This command will check against a password. If the password matches the one in /etc/tpasswd you will get an ok.
$ srptool --passwd /etc/tpasswd --passwd\-conf /etc/tpasswd.conf --verify -u test

EXIT STATUS
One of the following exit values will be returned:

Successful program execution.

The operation failed or the command syntax was not valid.

SEE ALSO
gnutls-cli-debug (1), gnutls-serv (1), srptool (1), psktool (1), certtool (1)

AUTHORS

COPYRIGHT
Copyright (C) 2020-2021 Free Software Foundation, and others all rights reserved. This program is released under the terms of the GNU General Public License, version 3 or later

BUGS
Please send bug reports to: bugs@gnutls.org