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OPENSSL-REHASH(1SSL) OpenSSL OPENSSL-REHASH(1SSL)
NAME
openssl-rehash, c_rehash - Create symbolic links to files named by the hash values
SYNOPSIS
openssl rehash [-h] [-help] [-old] [-compat] [-n] [-v] [-provider name] [-provider-path
path] [-propquery propq] [directory] ...
c_rehash [-h] [-help] [-old] [-n] [-v] [-provider name] [-provider-path path] [-propquery
propq] [directory] ...
DESCRIPTION
This command is generally equivalent to the external script c_rehash, except for minor
differences noted below.
openssl rehash scans directories and calculates a hash value of each .pem, .crt, .cer, or
.crl file in the specified directory list and creates symbolic links for each file, where
the name of the link is the hash value. (If the platform does not support symbolic links,
a copy is made.) This command is useful as many programs that use OpenSSL require
directories to be set up like this in order to find certificates.
If any directories are named on the command line, then those are processed in turn. If
not, then the SSL_CERT_DIR environment variable is consulted; this should be a colon-
separated list of directories, like the Unix PATH variable. If that is not set then the
default directory (installation-specific but often /usr/local/ssl/certs) is processed.
In order for a directory to be processed, the user must have write permissions on that
directory, otherwise an error will be generated.
The links created are of the form HHHHHHHH.D, where each H is a hexadecimal character and
D is a single decimal digit. When a directory is processed, all links in it that have a
name in that syntax are first removed, even if they are being used for some other purpose.
To skip the removal step, use the -n flag. Hashes for CRL's look similar except the
letter r appears after the period, like this: HHHHHHHH.rD.
Multiple objects may have the same hash; they will be indicated by incrementing the D
value. Duplicates are found by comparing the full SHA-1 fingerprint. A warning will be
displayed if a duplicate is found.
A warning will also be displayed if there are files that cannot be parsed as either a
certificate or a CRL or if more than one such object appears in the file.
Script Configuration
The c_rehash script uses the openssl program to compute the hashes and fingerprints. If
not found in the user's PATH, then set the OPENSSL environment variable to the full
pathname. Any program can be used, it will be invoked as follows for either a certificate
or CRL:
$OPENSSL x509 -hash -fingerprint -noout -in FILENAME
$OPENSSL crl -hash -fingerprint -noout -in FILENAME
where FILENAME is the filename. It must output the hash of the file on the first line, and
the fingerprint on the second, optionally prefixed with some text and an equals sign.
OPTIONS
-help -h
Display a brief usage message.
-old
Use old-style hashing (MD5, as opposed to SHA-1) for generating links to be used for
releases before 1.0.0. Note that current versions will not use the old style.
-n Do not remove existing links. This is needed when keeping new and old-style links in
the same directory.
-compat
Generate links for both old-style (MD5) and new-style (SHA1) hashing. This allows
releases before 1.0.0 to use these links along-side newer releases.
-v Print messages about old links removed and new links created. By default, this
command only lists each directory as it is processed.
-provider name
-provider-path path
-propquery propq
See "Provider Options" in openssl(1), provider(7), and property(7).
ENVIRONMENT
OPENSSL
The path to an executable to use to generate hashes and fingerprints (see above).
SSL_CERT_DIR
Colon separated list of directories to operate on. Ignored if directories are listed
on the command line.
SEE ALSO
openssl(1), openssl-crl(1), openssl-x509(1)
COPYRIGHT
Copyright 2015-2020 The OpenSSL Project Authors. All Rights Reserved.
Licensed under the Apache License 2.0 (the "License"). You may not use this file except
in compliance with the License. You can obtain a copy in the file LICENSE in the source
distribution or at <https://www.openssl.org/source/license.html>.
3.0.2 2024-08-20 OPENSSL-REHASH(1SSL)
Generated by $Id: phpMan.php,v 4.55 2007/09/05 04:42:51 chedong Exp $ Author: Che Dong
On Apache
Under GNU General Public License
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