canlock - CLI frontend for libcanlock library

       Michael Baeuerle

       Command line utility for Netnews Cancel-Lock authentication scheme.

       canlock  can  be  used to create <c-lock> and <c-key> elements according to RFC 8315.  The secret data is
       read from standard input (using EOF for termination).

       canlock also provides a verify interface with the -c option.  An external header parser  is  required  to
       extract the <c-key> and <c-lock> elements from the article headers.
       The command line utilities canlock-mhp(1) and canlock-hfp(1) can be used for this purpose.

       Zero on success or regular exit respectively.
       All other values indicate an error.

       canlock - CLI frontend for libcanlock library

       The following options are supported:

       -ascheme           Use the hash algorithm specified by <scheme>.
                           Supported values for <scheme> (by version 3.0.0 of canlock):
                           sha1, sha224, sha256, sha384, sha512

                           If  this  option is not present, sha256 is used as default value (because this is the
                           mandatory algorithm defined by RFC 8315).

       -l[uid]mid         Generate Cancel-Lock for Message-ID <mid>.
                           The Message-ID can be prepended with an optional User-ID <uid>.

                           The result is a <c-lock> element.

       -k[uid]mid         Generate Cancel-Key for Message-ID <mid>.
                           The Message-ID can be prepended with an optional User-ID <uid>.

                           The result is a <c-key> element.

       -cc-key,c-lock     Verify whether <c-key> element of a cancel or supersede matches the <c-lock>  element
                           of a target article.

       -mkeys,locks       Verify whether one of multiple keys matches one of multiple locks.
                           The elements of both lists must be separated by SP (space) characters.
                           Anything  must  be  passed  as  single  parameter of the "-m" option, use appropriate
                           quoting.

       -q                  Write no result to standard output.

                           Only valid if specified before -c and -o options.

       -h                  Print help message, then exit.

       -o                  Print whether libcanlock reports support for overwriting secret data in memory.

                           The exit status is zero if cl_clear_secret(3) returned zero.

       -v                  Print version and compile time options, then exit.

       Report bugs to <mailto:michael.baeuerle@gmx.net>.

canlock-hfp(1),   canlock-mhp(1),   cl_clear_secret(3),   cl_get_lock(3),   cl_get_key(3),   cl_split(3),
       cl_verify(3), cl_verify_multi(3)
       http://en.wikipedia.org/wiki/Usenet

Unix                                               2024-05-11                                         canlock(1)

canlock tries to comply with the following standards:

       RFC 5537, RFC 6234, RFC 8315

canlock -h | -v

       canlock [-q] -o

       canlock [-a scheme] -l [uid]mid

       canlock [-a scheme] -k [uid]mid

       canlock [-q] -c key,lock

       canlock [-q] -m keys,locks