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+=pod
+
+=for comment
+Original text by James Westby, contributed under the OpenSSL license.
+
+=head1 NAME
+
+openssl-c_rehash, openssl-rehash,
+c_rehash, rehash - Create symbolic links to files named by the hash values
+
+=head1 SYNOPSIS
+
+B<openssl>
+B<rehash>
+B<[-h]>
+B<[-help]>
+B<[-old]>
+B<[-n]>
+B<[-v]>
+[ I<directory>...]
+
+B<c_rehash>
+I<flags...>
+
+=head1 DESCRIPTION
+
+On some platforms, the OpenSSL B<rehash> command is available as
+an external script called B<c_rehash>.  They are functionally equivalent,
+except for minor differences noted below.
+
+B<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.
+
+If any directories are named on the command line, then those are
+processed in turn. If not, then the B<SSL_CERT_DIR> environment variable
+is consulted; this should be a colon-separated list of directories,
+like the Unix B<PATH> variable.
+If that is not set then the default directory (installation-specific
+but often B</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 C<HHHHHHHH.D>, where each B<H>
+is a hexadecimal character and B<D> is a single decimal digit.
+When processing a directory, B<rehash> will first remove all links
+that have a name in that syntax, even if they are being used for some
+other purpose.
+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>.
+
+Multiple objects may have the same hash; they will be indicated by
+incrementing the B<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.
+
+=head2 Script Configuration
+
+The B<c_rehash> script
+uses the B<openssl> program to compute the hashes and
+fingerprints. If not found in the user's B<PATH>, then set the
+B<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 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<-help> B<-h>
+
+Display a brief usage message.
+
+=item B<-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.
+
+=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<rehash> only lists each directory as it is processed.
+
+=back
+
+=head1 ENVIRONMENT
+
+=over 4
+
+=item B<OPENSSL>
+
+The path to an executable to use to generate hashes and
+fingerprints (see above).
+
+=item B<SSL_CERT_DIR>
+
+Colon separated list of directories to operate on.
+Ignored if directories are listed on the command line.
+
+=back
+
+=head1 SEE ALSO
+
+L<openssl(1)>,
+L<crl(1)>.
+L<x509(1)>.
+
+=head1 COPYRIGHT
+
+Copyright 2015-2016 The OpenSSL Project Authors. All Rights Reserved.
+
+Licensed under the OpenSSL license (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
+L<https://www.openssl.org/source/license.html>.
+
+=cut