gpgv(1) [redhat man page]
gpgv(1) General Commands Manual gpgv(1) NAME
gpgv -- signature verification tool SYNOPSIS
gpgv [options] [signed files] DESCRIPTION
gpgv is the OpenPGP signature checking tool. This program is a stripped down version of gpg which is only able to check signatures. It is somewhat smaller than the full blown gpg and uses a different (and more simple way) to check that the public keys used to made the signature are trustworth. There is no options files and only very few options are implemented. gpgv assumes that all keys in the keyring are trustworty. It uses by default a keyring named trustedkeys.gpg which is assumed to be in the home directory as defined by GnuPG or set by an option or an environment variable. An option may be used to specify another keyring or even multiple keyrings. OPTIONS
gpgv recognizes these options: -v, --verbose Give more information during processing. If used twice, the input data is listed in detail. -q, --quiet 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). The filename may be prefixed with a scheme: "gnupg-ring:" is the default one. It might make sense to use it together with --no-default-keyring. --homedir directory Set the name of the home directory to directory If this option is not used it defaults to "~/.gnupg". It does not make sense to use this in a options file. This also overrides the environment variable "GNUPGHOME". --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. --ignore-time-conflict GnuPG normally checks that the timestamps associated with keys and signatures have plausible values. However, sometimes a signa- ture seems to be older than the key due to clock problems. This option makes these checks just a warning. RETURN VALUE
The program returns 0 if everything was fine, 1 if at least one signature was bad, and other error codes for fatal errors. EXAMPLES
gpgv pgpfile gpgv sigfile [files] 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 [files] are the signed data; if this 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. ENVIRONMENT
HOME Used to locate the default home directory. GNUPGHOME If set directory used instead of "~/.gnupg". FILES
~/.gnupg/trustedkeys.gpg The default keyring with the allowed keys gpgv(1)
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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 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 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. --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 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. --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. GnuPG 2.2.4 2017-12-18 GPGV(1)