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+=pod
+{- OpenSSL::safe::output_do_not_edit_headers(); -}
+
+=for comment
+Original text by James Westby, contributed under the OpenSSL license.
+
+=head1 NAME
+
+openssl-rehash, c_rehash - Create symbolic links to files named by the hash
+values
+
+=head1 SYNOPSIS
+
+B<openssl>
+B<rehash>
+[B<-h>]
+[B<-help>]
+[B<-old>]
+[B<-compat>]
+[B<-n>]
+[B<-v>]
+[I<directory>] ...
+
+B<c_rehash>
+[B<-h>]
+[B<-help>]
+[B<-old>]
+[B<-n>]
+[B<-v>]
+[I<directory>] ...
+
+=head1 DESCRIPTION
+
+This command is generally equivalent to the external
+script B<c_rehash>,
+except for minor differences noted below.
+
+B<openssl rehash> scans directories and calculates a hash value of
+each F<.pem>, F<.crt>, F<.cer>, or F<.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 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 F</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 I<HHHHHHHH.D>, where each I<H>
+is a hexadecimal character and I<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 B<-n> flag.
+Hashes for CRL's look similar except the letter B<r> appears after
+the period, like this: I<HHHHHHHH.>B<r>I<D>.
+
+Multiple objects may have the same hash; they will be indicated by
+incrementing the I<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 I<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<-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.
+
+=item B<-v>
+
+Print messages about old links removed and new links created.
+By default, this command 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<openssl-crl(1)>,
+L<openssl-x509(1)>
+
+=head1 COPYRIGHT
+
+Copyright 2015-2019 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
+L<https://www.openssl.org/source/license.html>.
+
+=cut