symcryptrun Man page



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 pro‐
vides a passphrase for a key using the standard pinentry based mecha‐
nism 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. Cur‐
rently 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 con‐
sidered, 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/gnupg2’ 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 occured.

No valid passphrase was provided.

The operation was canceled by the user.


gpg, gpgsm(1), gpg-agent,

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 struc‐
ture and an index.

GnuPG 2.1.11 2016-01-21 SYMCRYPTRUN(1)

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