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 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).

       --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 signature; 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 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\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 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 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.

       --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 descriptor 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 structure and an index.