openssl-rehash, c_rehash - Create symbolic links to files named by the hash
values
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] ...
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.
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.
-
-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).
- 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.
openssl(1),
openssl-crl(1),
openssl-x509(1)
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>.