Linux and UNIX Man Pages

Linux & Unix Commands - Search Man Pages

gpgv(1) [xfree86 man page]

GPGV(1) 						       GNU Privacy Guard 2.1							   GPGV(1)

       gpgv - Verify OpenPGP signatures

       gpgv [options] signed_files

       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.

       The program returns 0 if everything is fine, 1 if at least one signature was bad, and other error codes for fatal errors.

       gpgv recognizes these options:

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

       -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 file-
	      name 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.

	      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 recog-
	      nized 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 HKCUSoftwareGNUGnuPG:HomeDir.

	      On Windows systems it is possible to install GnuPG as a portable application.  In this case only this command line option is consid-
	      ered, 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 direc-
	      tory 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.

	      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.

       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.

	      The default keyring with the allowed keys.

       HOME   Used to locate the default home directory.

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


       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 2.2.4							    2017-12-18								   GPGV(1)
Man Page