# OpenSSL::Versions OpenSSL source code uses a hexadecimal number which encodes various bits of information. The meaning of various parts have changed over the history of the library. For example, you have #define OPENSSL_VERSION_NUMBER 0x0913 /* Version 0.9.1c is 0913 */ versus #define OPENSSL_VERSION_NUMBER 0x1000007fL /* OpenSSL 1.0.0g */ The evolution of the version number scheme is explained in the `crypto/opensslv.h` file in the distribution. If you have already built OpenSSL, you can determine its version by invoking the command line utility: $ openssl version OpenSSL 1.0.0g 18 Jan 2012 However, if all you have is the source code, and you want to determine exact version information on the basis of the string representation of the `OPENSSL_VERSION_NUMBER` macro, you have to use pattern matching and deal with a bunch of corner cases. The `Makefile.PL` for `Crypt::SSLeay` contained a simplistic approach to parsing the value of `OPENSSL_VERSION_NUMBER` which people had tweaked over time to deal with changes. I added functions to deal with specific ranges of version numbers. But, I did not think those functions belonged in a `Makefile.PL`. So, I put them in their own module. To test the routines, I downloaded all available versions of OpenSSL from http://www.openssl.org/source/ (excluding archives with 'fips' and 'engine' in their names, and built a mapping between the value of OPENSSL_VERSION_NUMBER in each archive and the corresponding human friendly version string in the name of the archive. ## INSTALLATION To install this module, run the following commands: perl Makefile.PL make make test make install ## SUPPORT AND DOCUMENTATION After installing, you can find documentation for this module with the perldoc command. perldoc OpenSSL::Versions You can also look for information at: * [RT, CPAN's request tracker (report bugs here)](http://rt.cpan.org/NoAuth/Bugs.html?Dist=OpenSSL-Versions) * [AnnoCPAN, Annotated CPAN documentation](http://annocpan.org/dist/OpenSSL-Versions) * [CPAN Ratings](http://cpanratings.perl.org/d/OpenSSL-Versions) * [Search CPAN](http://search.cpan.org/dist/OpenSSL-Versions/) ## LICENSE AND COPYRIGHT Copyright © 2012 A. Sinan Unur This program is free software; you can redistribute it and/or modify it under the terms of either: the GNU General Public License as published by the Free Software Foundation; or the Artistic License. See http://dev.perl.org/licenses/ for more information.