symcryptrun - Call a simple symmetric encryption tool


   symcryptrun   --class   class   --program   program  --keyfile  keyfile
   [--decrypt|--encrypt] [inputfile]


   Sometimes simple encryption tools are already in use for  a  long  time
   and there might be a desire to integrate them into the GnuPG framework.
   The protocols and encryption methods might be non-standard or not  even
   properly  documented,  so  that  a full-fledged encryption tool with an
   interface like gpg is not doable.  symcryptrun provides a solution:  It
   operates  by  calling  the  external  encryption/decryption  module and
   provides a passphrase for a  key  using  the  standard  pinentry  based
   mechanism through gpg-agent.

   Note,  that  symcryptrun is only available if GnuPG has been configured
   with '--enable-symcryptrun' at build time.

   For encryption, the plain text must be provided  on  STDIN  or  as  the
   argument  inputfile,  and the ciphertext will be output to STDOUT.  For
   decryption vice versa.

   CLASS  describes  the  calling  conventions  of  the   external   tool.
   Currently  it  must  be  given  as  'confucius'.   PROGRAM  is the full
   filename of that external tool.

   For the class 'confucius' the option --keyfile is required; keyfile  is
   the name of a file containing the secret key, which may be protected by
   a passphrase.  For detailed calling conventions, see the source code.

   Note, that gpg-agent must be running before starting symcryptrun.

   The following additional options may be used:

          Output additional information while running.


          Try to be as quiet as possible.

   --homedir dir
          Set the name of the home directory to dir. If this option is not
          used,  the  home  directory  defaults to '~/.gnupg'.  It is only
          recognized when given on the command line.   It  also  overrides
          any  home  directory  stated  through  the  environment variable
          'GNUPGHOME' or (on Windows systems) by  means  of  the  Registry
          entry HKCU\Software\GNU\GnuPG:HomeDir.

          On Windows systems it is possible to install GnuPG as a portable
          application.  In this case only  this  command  line  option  is
          considered, all other ways to set a home directory are ignored.

          To install GnuPG as a portable application under Windows, create
          an empty file name 'gpgconf.ctl' in the same  directory  as  the
          tool  'gpgconf.exe'.   The root of the installation is than that
          directory; or, if  'gpgconf.exe'  has  been  installed  directly
          below  a  directory named 'bin', its parent directory.  You also
          need to make sure that the following directories exist  and  are
          writable:     'ROOT/home'     for    the    GnuPG    home    and
          'ROOT/var/cache/gnupg' for internal cache files.

   --log-file file
          Append all logging output to file.  Default is to write  logging
          information to STDERR.

   The possible exit status codes of symcryptrun are:


                  Some error occurred.

                  No valid passphrase was provided.

                  The operation was canceled by the user.


   gpg(1), gpgsm(1), gpg-agent(1),

   The full documentation for this tool is maintained as a Texinfo manual.
   If GnuPG and the info program are properly installed at your site,  the

     info gnupg

   should  give  you  access  to  the  complete  manual  including  a menu
   structure and an index.


Personal Opportunity - Free software gives you access to billions of dollars of software at no cost. Use this software for your business, personal use or to develop a profitable skill. Access to source code provides access to a level of capabilities/information that companies protect though copyrights. Open source is a core component of the Internet and it is available to you. Leverage the billions of dollars in resources and capabilities to build a career, establish a business or change the world. The potential is endless for those who understand the opportunity.

Business Opportunity - Goldman Sachs, IBM and countless large corporations are leveraging open source to reduce costs, develop products and increase their bottom lines. Learn what these companies know about open source and how open source can give you the advantage.

Free Software

Free Software provides computer programs and capabilities at no cost but more importantly, it provides the freedom to run, edit, contribute to, and share the software. The importance of free software is a matter of access, not price. Software at no cost is a benefit but ownership rights to the software and source code is far more significant.

Free Office Software - The Libre Office suite provides top desktop productivity tools for free. This includes, a word processor, spreadsheet, presentation engine, drawing and flowcharting, database and math applications. Libre Office is available for Linux or Windows.

Free Books

The Free Books Library is a collection of thousands of the most popular public domain books in an online readable format. The collection includes great classical literature and more recent works where the U.S. copyright has expired. These books are yours to read and use without restrictions.

Source Code - Want to change a program or know how it works? Open Source provides the source code for its programs so that anyone can use, modify or learn how to write those programs themselves. Visit the GNU source code repositories to download the source.


Study at Harvard, Stanford or MIT - Open edX provides free online courses from Harvard, MIT, Columbia, UC Berkeley and other top Universities. Hundreds of courses for almost all major subjects and course levels. Open edx also offers some paid courses and selected certifications.

Linux Manual Pages - A man or manual page is a form of software documentation found on Linux/Unix operating systems. Topics covered include computer programs (including library and system calls), formal standards and conventions, and even abstract concepts.