c_rehash [directory] ...
c_rehash scans directories and takes a hash value of each .pem and .crt
file in the directory. It then creates symbolic links for each of the
files named by the hash value. This is useful as many programs require
directories to be set up like this in order to find the certificates
If any directories are named on the command line then these directories
are processed in turn. If not then and the environment variable
SSL_CERT_DIR is defined then that is consulted. This variable should be
a colon (:) separated list of directories, all of which will be
processed. If neither of these conditions are true then
/usr/lib/ssl/certs is processed.
For each directory that is to be processed he user must have write
permissions on the directory, if they do not then nothing will be
printed for that directory.
Note that this program deletes all the symbolic links that look like
ones that it creates before processing a directory. Beware that if you
run the program on a directory that contains symbolic links for other
purposes that are named in the same format as those created by this
program they will be lost.
The hashes for certificate files are of the form <hash>.<n> where n is
an integer. If the hash value already exists then n will be
incremented, unless the file is a duplicate. Duplicates are detected
using the fingerprint of the certificate. A warning will be printed if
a duplicate is detected. The hashes for CRL files are of the form
<hash>.r<n> and have the same behavior.
The program will also warn if there are files with extension .pem which
are not certificate or CRL files.
The program uses the openssl program to compute the hashes and
fingerprints. It expects the executable to be named openssl and be on
the PATH, or in the /usr/lib/ssl/bin directory. If the OPENSSL
environment variable is defined then this is used instead as the
executable that provides the hashes and fingerprints. When called as
$OPENSSL x509 -hash -fingerprint -noout -in $file it must output the
hash of $file on the first line followed by the fingerprint on the
second line, optionally prefixed with some text and an equals sign (=).
The name (and path) of an executable to use to generate hashes and
fingerprints (see above).
1.0.1f 2017-11-02 C_REHASH(1SSL)
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