Manual: gpgv

GPGV(1)						    GNU Privacy Guard 2.4					     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 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 ‘trust‐
       edkeys.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 er‐
       rors.

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 di‐
	      rectory. 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 cleart‐
	      ext 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 list‐
	      ing 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.

       --weak-digest name
	      Treat the specified digest algorithm as weak.  Signatures made over weak digests algorithms are  normally	 re‐
	      jected.  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, re‐
	      fer to the file descriptor n and not to a file with that name.

       --assert-pubkey-algo algolist
	      This option works in the same way as described for gpg.

EXAMPLES
       gpgv pgpfile
       gpgv sigfile [datafile]
	      Verify the signature of the file. The second form is used for detached signatures, where sigfile	is  the	 de‐
	      tached  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.

GnuPG 2.4.8						 2025-02-19						     GPGV(1)