upd: openssl to 1.1.0

[cassiopeia.git] / lib / openssl / doc / apps / c_rehash.pod

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-=pod
-
-=for comment
-Original text by James Westby, contributed under the OpenSSL license.
-
-=head1 NAME
-
-c_rehash - Create symbolic links to files named by the hash values
-
-=head1 SYNOPSIS
-
-B<c_rehash>
-[ I<directory>...]
-
-=head1 DESCRIPTION
-
-B<c_rehash> scans directories and calculates a hash value of each C<.pem>
-file in the specified directory list and creates symbolic links
-for each file, where the name of the link is the hash value.
-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 shold 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 it will be skipped.
-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<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.
-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 B<.pem> files that
-cannot be parsed as either a certificate or a CRL.
-
-The program 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 FFFFFF
-  $OPENSSL crl -hash -fingerprint -noout -in FFFFFF
-
-where B<FFFFFF> 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 ENVIRONMENT
-
-=over
-
-=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)|openssl(1)>,
-L<crl(1)|crl(1)>.
-L<x509(1)|x509(1)>.