104 lines
4.5 KiB
Plaintext
104 lines
4.5 KiB
Plaintext
=pod
|
|
|
|
=head1 NAME
|
|
|
|
ossl-guide-introduction
|
|
- OpenSSL Guide: An introduction to OpenSSL
|
|
|
|
=head1 WHAT IS OPENSSL?
|
|
|
|
OpenSSL is a robust, commercial-grade, full-featured toolkit for general-purpose
|
|
cryptography and secure communication. Its features are made available via a
|
|
command line application that enables users to perform various cryptography
|
|
related functions such as generating keys and certificates. Additionally it
|
|
supplies two libraries that application developers can use to implement
|
|
cryptography based capabilities and to securely communicate across a network.
|
|
Finally, it also has a set of providers that supply implementations of a broad
|
|
set of cryptographic algorithms.
|
|
|
|
OpenSSL is fully open source. Version 3.0 and above are distributed under the
|
|
Apache v2 license.
|
|
|
|
=head1 GETTING AND INSTALLING OPENSSL
|
|
|
|
The OpenSSL Project develops and distributes the source code for OpenSSL. You
|
|
can obtain that source code via the OpenSSL website
|
|
(L<https://www.openssl.org/source>).
|
|
|
|
Many Operating Systems (notably Linux distributions) supply pre-built OpenSSL
|
|
binaries either pre-installed or available via the package management system in
|
|
use for that OS. It is worth checking whether this applies to you before
|
|
attempting to build OpenSSL from the source code.
|
|
|
|
Some third parties also supply OpenSSL binaries (e.g. for Windows and some other
|
|
platforms). The OpenSSL project maintains a list of these third parties at
|
|
L<https://wiki.openssl.org/index.php/Binaries>.
|
|
|
|
If you build and install OpenSSL from the source code then you should download
|
|
the appropriate files for the version that you want to use from the link given
|
|
above. Extract the contents of the B<tar.gz> archive file that you downloaded
|
|
into an appropriate directory. Inside that archive you will find a file named
|
|
B<INSTALL.md> which will supply detailed instructions on how to build and
|
|
install OpenSSL from source. Make sure you read the contents of that file
|
|
carefully in order to achieve a successful build. In the directory you will also
|
|
find a set of B<NOTES> files that provide further platform specific information.
|
|
Make sure you carefully read the file appropriate to your platform. As well as
|
|
the platform specific B<NOTES> files there is also a B<NOTES-PERL.md> file that
|
|
provides information about setting up Perl for use by the OpenSSL build system
|
|
across multiple platforms.
|
|
|
|
Sometimes you may want to build and install OpenSSL from source on a system
|
|
which already has a pre-built version of OpenSSL installed on it via the
|
|
Operating System package management system (for example if you want to use a
|
|
newer version of OpenSSL than the one supplied by your Operating System). In
|
|
this case it is strongly recommended to install OpenSSL to a different location
|
|
than where the pre-built version is installed. You should B<never> replace the
|
|
pre-built version with a different version as this may break your system.
|
|
|
|
=head1 CONTENTS OF THE OPENSSL GUIDE
|
|
|
|
The OpenSSL Guide is a series of documentation pages (starting with this one)
|
|
that introduce some of the main concepts in OpenSSL. The guide can either be
|
|
read end-to-end in order, or alternatively you can simply skip to the parts most
|
|
applicable to your use case. Note however that later pages may depend on and
|
|
assume knowledge from earlier pages.
|
|
|
|
The pages in the guide are as follows:
|
|
|
|
=over 4
|
|
|
|
=item L<ossl-guide-libraries-introduction(7)>: An introduction to the OpenSSL libraries
|
|
|
|
=item L<ossl-guide-libcrypto-introduction(7)>: An introduction to libcrypto
|
|
|
|
=item L<ossl-guide-libssl-introduction(7)>: An introduction to libssl
|
|
|
|
=item L<ossl-guide-tls-introduction(7)>: An introduction to SSL/TLS in OpenSSL
|
|
|
|
=item L<ossl-guide-tls-client-block(7)>: Writing a simple blocking TLS client
|
|
|
|
=item L<ossl-guide-tls-client-non-block(7)>: Writing a simple nonblocking TLS client
|
|
|
|
=item L<ossl-guide-quic-introduction(7)>: An introduction to QUIC in OpenSSL
|
|
|
|
=item L<ossl-guide-quic-client-block(7)>: Writing a simple blocking QUIC client
|
|
|
|
=item L<ossl-guide-quic-multi-stream(7)>: Writing a simple multi-stream QUIC client
|
|
|
|
=item L<ossl-guide-quic-client-non-block(7)>: Writing a simple nonblocking QUIC client
|
|
|
|
=item L<ossl-guide-migration(7)>: Migrating from older OpenSSL versions
|
|
|
|
=back
|
|
|
|
=head1 COPYRIGHT
|
|
|
|
Copyright 2023 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
|