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GPGV(1)                               GNU Privacy Guard 1.4                               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 signa‐
       tures. 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 con‐
       figuration 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.

       By  default a keyring named ‘trustedkeys.gpg’ is used.  This default keyring is assumed to
       be in the home directory of GnuPG, either the default home directory or the one set by  an
       option  or an environment variable.  The option --keyring may be used to specify a differ‐
       ent keyring or even multiple keyrings.

RETURN VALUE
       The program returns 0 if everything is fine, 1 if at least  one  signature  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 input 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).

       --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.

       --ignore-time-conflict
              GnuPG  normally checks that the timestamps associated with keys and signatures have
              plausible values. However, sometimes a signature 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  entry  HKCU\Soft‐
              ware\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.

       --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.

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
       gpg2(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 structure and an index.

GnuPG 1.4.20                                2016-08-18                                    GPGV(1)

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