gpgv

GPGV(1)                      GNU Privacy Guard 2.2                     GPGV(1)

NAME
       gpgv - Verify OpenPGP signatures

SYNOPSIS
       gpgv [options] signed_files

DESCRIPTION
       gpgv is an OpenPGP signature verification tool.

       This  program  is actually a stripped-down version of gpg which is only
       able to check signatures. It is somewhat smaller than  the  fully-blown
       gpg  and  uses  a  different (and simpler) way to check that the public
       keys used to make the signature are valid. There are  no  configuration
       files and only a few options are implemented.

       gpgv  assumes  that all keys in the keyring are trustworthy.  That does
       also mean that it does not check for expired or revoked keys.

       If no --keyring option is given, gpgv looks for a  ``default''  keyring
       named  'trustedkeys.kbx'  (preferred)  or 'trustedkeys.gpg' in the home
       directory of GnuPG, either the default home directory or the one set by
       the  --homedir  option  or  the GNUPGHOME environment variable.  If any
       --keyring option is used, gpgv will not look for the  default  keyring.
       The  --keyring  option  may  be  used  multiple times and all specified
       keyrings will be used together.

RETURN VALUE
       The program returns 0 if everything is fine, 1 if at least  one  signa-
       ture was bad, and other error codes for fatal errors.

OPTIONS
       gpgv recognizes these options:

       --verbose
       -v     Gives more information during processing. If used twice, the in-
              put data is listed in detail.

       --quiet
       -q     Try to be as quiet as possible.

       --keyring file
              Add file to the list of keyrings.  If file begins with  a  tilde
              and  a  slash,  these are replaced by the HOME directory. If the
              filename does not contain a slash, it is assumed to  be  in  the
              home-directory ("~/.gnupg" if --homedir is not used).

       --output file
       -o file
              Write output to file; to write to stdout use -.  This option can
              be used to get the signed text from a cleartext or binary signa-
              ture;  it  also  works for detached signatures, but in that case
              this option is in general not useful.   Note  that  an  existing
              file will be overwritten.

       --status-fd n
              Write  special status strings to the file descriptor n.  See the
              file DETAILS in the documentation for a listing of them.

       --logger-fd n
              Write log output to file descriptor n and not to stderr.

       --log-file file
              Same as --logger-fd, except the logger data is written  to  file
              file.  Use 'socket://' to log to socket.

       --ignore-time-conflict
              GnuPG  normally  checks that the timestamps associated with keys
              and signatures have plausible values. However, sometimes a  sig-
              nature  seems  to  be  older than the key due to clock problems.
              This option turns these checks into warnings.

       --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 en-
              try 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 named 'gpgconf.ctl' in the same directory  as  the
              tool  'gpgconf.exe'.   The root of the installation is then that
              directory; or, if 'gpgconf.exe' has been installed directly  be-
              low  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.

       --weak-digest name
              Treat the specified digest algorithm as weak.   Signatures  made
              over  weak digests algorithms are normally rejected. This option
              can be supplied multiple times if multiple algorithms should  be
              considered  weak.   MD5  is always considered weak, and does not
              need to be listed explicitly.

       --enable-special-filenames
              This option enables a mode in which filenames of the form '-&n',
              where  n is a non-negative decimal number, refer to the file de-
              scriptor n and not to a file with that name.

EXAMPLES
       gpgv pgpfile
       gpgv sigfile [datafile]
              Verify the signature of the file. The second form  is  used  for
              detached  signatures,  where  sigfile  is the detached signature
              (either ASCII-armored  or  binary)  and  datafile  contains  the
              signed  data;  if datafile is "-" the signed data is expected on
              stdin; if datafile is not given the name of the file holding the
              signed data is constructed by cutting off the extension (".asc",
              ".sig" or ".sign") from sigfile.

FILES
       ~/.gnupg/trustedkeys.gpg
              The default keyring with the allowed keys.

ENVIRONMENT
       HOME   Used to locate the default home directory.

       GNUPGHOME
              If set directory used instead of "~/.gnupg".

SEE ALSO
       gpg(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
       command

         info gnupg

       should give you access to the complete manual including a  menu  struc-
       ture and an index.

GnuPG 2.2.19                      2019-11-23                           GPGV(1)