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 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.