gpgv(1)



GPGV(1)                      GNU Privacy Guard 2.1                     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.

       By default a keyring named 'trustedkeys.kbx' is used; if that does  not
       exist  a  keyring named 'trustedkeys.gpg' is used.  The 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 different keyring or even
       multiple keyrings.

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
              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 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
              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 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 struc-
       ture and an index.

GnuPG 2.2.2                       2017-11-07                           GPGV(1)

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