=head1 SYNOPSIS
B<c_rehash>
+B<[-old]>
+B<[-h]>
+B<[-n]>
+B<[-v]>
[ I<directory>...]
=head1 DESCRIPTION
-B<c_rehash> scans directories and calculates a hash value of each C<.pem>
+B<c_rehash> scans directories and calculates a hash value of each
+C<.pem>, C<.crt>, C<.cer>, or C<.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 utility is useful as many programs that use OpenSSL require
directories to be set up like this in order to find certificates.
When processing a directory, B<c_rehash> will first remove all links
that have a name in that syntax. If you have links in that format
used for other purposes, they will be removed.
+To skip the removal step, use the B<-n> flag.
Hashes for CRL's look similar except the letter B<r> appears after
the period, like this: C<HHHHHHHH.rD>.
full SHA-1 fingerprint. A warning will be displayed if a duplicate
is found.
-A warning will also be displayed if there are B<.pem> files that
+A warning will also be displayed if there are files that
cannot be parsed as either a certificate or a CRL.
The program uses the B<openssl> program to compute the hashes and
Any program can be used, it will be invoked as follows for either
a certificate or CRL:
- $OPENSSL x509 -hash -fingerprint -noout -in FFFFFF
- $OPENSSL crl -hash -fingerprint -noout -in FFFFFF
+ $OPENSSL x509 -hash -fingerprint -noout -in FILENAME
+ $OPENSSL crl -hash -fingerprint -noout -in FILENAME
-where B<FFFFFF> is the filename. It must output the hash of the
+where B<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.
+=head1 OPTIONS
+
+=over 4
+
+=item B<-old>
+
+Use old-style hashing (MD5, as opposed to SHA-1) for generating
+links for releases before 1.0.0. Note that current versions will
+not use the old style.
+
+=item B<-h>
+
+Display a brief usage message.
+
+=item B<-n>
+
+Do not remove existing links.
+This is needed when keeping new and old-style links in the same directory.
+
+=item B<-v>
+
+Print messages about old links removed and new links created.
+By default, B<c_rehash> only lists each directory as it is processed.
+
+=back
+
=head1 ENVIRONMENT
=over