@node srptool Invocation
@subsubsection Invoking srptool
@pindex srptool

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).

@anchor{srptool usage}
@subsubheading srptool help/usage (@option{-?})
@cindex srptool help

The text printed is the same whether selected with the @code{help} option
(@option{--help}) or the @code{more-help} option (@option{--more-help}).  @code{more-help} will print
the usage text by passing it through a pager program.
@code{more-help} is disabled on platforms without a working
@code{fork(2)} function.  The @code{PAGER} environment variable is
used to select the program, defaulting to @file{more}.  Both will exit
with a status code of 0.

@exampleindent 0
@example
srptool - GnuTLS SRP tool
Usage:  srptool [ -<flag> [<val>] | --<name>[@{=| @}<val>] ]... 

None:

   -d, --debug=num            Enable debugging
				- it must be in the range:
				  0 to 9999
   -i, --index=num            specify the index of the group parameters in tpasswd.conf to use
   -u, --username=str         specify a username
   -p, --passwd=str           specify a password file
   -s, --salt=num             specify salt size
       --verify               just verify the password
   -v, --passwd-conf=str      specify a password conf file
       --create-conf=str      Generate a password configuration file

Version, usage and configuration options:

   -v, --version[=arg]        output version information and exit
   -h, --help                 display extended usage information and exit
   -!, --more-help            extended usage information passed thru pager

Options are specified by doubled hyphens and their name or by a single
hyphen and the flag character.

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).

Please send bug reports to:  <bugs@@gnutls.org>

@end example
@exampleindent 4

@subsubheading debug option (-d).
@anchor{srptool debug}

This is the ``enable debugging'' option.
This option takes a ArgumentType.NUMBER argument.
Specifies the debug level.
@subsubheading verify option.
@anchor{srptool verify}

This is the ``just verify the password'' option.
Verifies the password provided against the password file.
@subsubheading passwd-conf option (-v).
@anchor{srptool passwd-conf}

This is the ``specify a password conf file'' option.
This option takes a ArgumentType.STRING argument.
Specify a filename or a PKCS #11 URL to read the CAs from.
@subsubheading create-conf option.
@anchor{srptool create-conf}

This is the ``generate a password configuration file'' option.
This option takes a ArgumentType.STRING argument.
This generates a password configuration file (tpasswd.conf)
containing the required for TLS parameters.
@subsubheading version option (-v).
@anchor{srptool version}

This is the ``output version information and exit'' option.
This option takes a ArgumentType.KEYWORD argument.
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.
@subsubheading help option (-h).
@anchor{srptool help}

This is the ``display extended usage information and exit'' option.
Display usage information and exit.
@subsubheading more-help option (-!).
@anchor{srptool more-help}

This is the ``extended usage information passed thru pager'' option.
Pass the extended usage information through a pager.
@anchor{srptool exit status}
@subsubheading srptool exit status

One of the following exit values will be returned:
@table @samp
@item 0 (EXIT_SUCCESS)
Successful program execution.
@item 1 (EXIT_FAILURE)
The operation failed or the command syntax was not valid.
@end table
@anchor{srptool See Also}
@subsubheading srptool See Also
    gnutls-cli-debug (1), gnutls-serv (1), srptool (1), psktool (1), certtool (1)
@anchor{srptool Examples}
@subsubheading srptool Examples
To create @file{tpasswd.conf} which holds the g and n values for SRP protocol
(generator and a large prime), run:
@example
$ srptool --create-conf /etc/tpasswd.conf
@end example

This command will create @file{/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.
@example
$ srptool --passwd /etc/tpasswd --passwd-conf /etc/tpasswd.conf -u test
@end example


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