srptool(1) — Linux manual page


srptool(1)                    User Commands                   srptool(1)

NAME         top

       srptool - GnuTLS SRP tool

SYNOPSIS         top

       srptool [-flags] [-flag [value]] [--option-name[[=| ]value]]

       All arguments must be options.

DESCRIPTION         top

       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         top

       -d num, --debug=num Enable debugging.  This option takes an
       integer number as its argument.  The value of num is constrained
       to being:
           in the range 0 through 9999

       Specifies the debug level.

       -i num, --index=num This option takes an integer number as its
       argument.  The default number for this option is:

       -u str, --username=str

       -p str, --passwd=str

       -s num, --salt=num This option takes an integer number as its

       --verify Verifies the password provided against the password

       -v str, --passwd-conf=str Specify a filename or a PKCS #11 URL to
       read the CAs from.

       --create-conf=str Generate a password configuration file.

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

       -v arg, --version=arg 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

       -h, --help Display usage information and exit.

       -!, --more-help Pass the extended usage information through a

EXAMPLES         top

              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
                  $ srptool --passwd /etc/tpasswd --passwd\-conf /etc/tpasswd.conf --verify -u test

EXIT STATUS         top

       One of the following exit values will be returned:

       0  (EXIT_SUCCESS) Successful program execution.

       1  (EXIT_FAILURE) The operation failed or the command syntax was
       not valid.

SEE ALSO         top

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

AUTHORS         top

COPYRIGHT         top

       Copyright (C) 2020-2023 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         top

       Please send bug reports to:

COLOPHON         top

       This page is part of the GnuTLS (GnuTLS Transport Layer Security
       Library) project.  Information about the project can be found at
       ⟨⟩.  If you have a bug report for this
       manual page, send it to  This page was obtained
       from the tarball gnutls-3.8.2.tar.xz fetched from
       ⟨⟩ on 2023-12-22.  If you
       discover any rendering problems in this HTML version of the page,
       or you believe there is a better or more up-to-date source for
       the page, or you have corrections or improvements to the
       information in this COLOPHON (which is not part of the original
       manual page), send a mail to

3.8.2                          15 Nov 2023                    srptool(1)

Pages that refer to this page: certtool(1)psktool(1)srptool(1)