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+.\" titles (.TH), headers (.SH), subsections (.SS), items (.Ip), and index
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+.\" ========================================================================
+.\"
+.IX Title "OSSL-GUIDE-INTRODUCTION 7ssl"
+.TH OSSL-GUIDE-INTRODUCTION 7ssl 2024-01-30 3.2.1 OpenSSL
+.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
+.\" way too many mistakes in technical documents.
+.if n .ad l
+.nh
+.SH NAME
+ossl\-guide\-introduction
+\&\- OpenSSL Guide: An introduction to OpenSSL
+.SH "WHAT IS OPENSSL?"
+.IX Header "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.
+.PP
+OpenSSL is fully open source. Version 3.0 and above are distributed under the
+Apache v2 license.
+.SH "GETTING AND INSTALLING OPENSSL"
+.IX Header "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
+(<https://www.openssl.org/source>).
+.PP
+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.
+.PP
+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
+<https://wiki.openssl.org/index.php/Binaries>.
+.PP
+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 \fBtar.gz\fR archive file that you downloaded
+into an appropriate directory. Inside that archive you will find a file named
+\&\fBINSTALL.md\fR 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 \fBNOTES\fR files that provide further platform specific information.
+Make sure you carefully read the file appropriate to your platform. As well as
+the platform specific \fBNOTES\fR files there is also a \fBNOTES\-PERL.md\fR file that
+provides information about setting up Perl for use by the OpenSSL build system
+across multiple platforms.
+.PP
+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 \fBnever\fR replace the
+pre-built version with a different version as this may break your system.
+.SH "CONTENTS OF THE OPENSSL GUIDE"
+.IX Header "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.
+.PP
+The pages in the guide are as follows:
+.IP "\fBossl\-guide\-libraries\-introduction\fR\|(7): An introduction to the OpenSSL libraries" 4
+.IX Item "ossl-guide-libraries-introduction: An introduction to the OpenSSL libraries"
+.PD 0
+.IP "\fBossl\-guide\-libcrypto\-introduction\fR\|(7): An introduction to libcrypto" 4
+.IX Item "ossl-guide-libcrypto-introduction: An introduction to libcrypto"
+.IP "\fBossl\-guide\-libssl\-introduction\fR\|(7): An introduction to libssl" 4
+.IX Item "ossl-guide-libssl-introduction: An introduction to libssl"
+.IP "\fBossl\-guide\-tls\-introduction\fR\|(7): An introduction to SSL/TLS in OpenSSL" 4
+.IX Item "ossl-guide-tls-introduction: An introduction to SSL/TLS in OpenSSL"
+.IP "\fBossl\-guide\-tls\-client\-block\fR\|(7): Writing a simple blocking TLS client" 4
+.IX Item "ossl-guide-tls-client-block: Writing a simple blocking TLS client"
+.IP "\fBossl\-guide\-tls\-client\-non\-block\fR\|(7): Writing a simple nonblocking TLS client" 4
+.IX Item "ossl-guide-tls-client-non-block: Writing a simple nonblocking TLS client"
+.IP "\fBossl\-guide\-quic\-introduction\fR\|(7): An introduction to QUIC in OpenSSL" 4
+.IX Item "ossl-guide-quic-introduction: An introduction to QUIC in OpenSSL"
+.IP "\fBossl\-guide\-quic\-client\-block\fR\|(7): Writing a simple blocking QUIC client" 4
+.IX Item "ossl-guide-quic-client-block: Writing a simple blocking QUIC client"
+.IP "\fBossl\-guide\-quic\-multi\-stream\fR\|(7): Writing a simple multi-stream QUIC client" 4
+.IX Item "ossl-guide-quic-multi-stream: Writing a simple multi-stream QUIC client"
+.IP "\fBossl\-guide\-quic\-client\-non\-block\fR\|(7): Writing a simple nonblocking QUIC client" 4
+.IX Item "ossl-guide-quic-client-non-block: Writing a simple nonblocking QUIC client"
+.IP "\fBossl\-guide\-migration\fR\|(7): Migrating from older OpenSSL versions" 4
+.IX Item "ossl-guide-migration: Migrating from older OpenSSL versions"
+.PD
+.SH COPYRIGHT
+.IX Header "COPYRIGHT"
+Copyright 2023 The OpenSSL Project Authors. All Rights Reserved.
+.PP
+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
+<https://www.openssl.org/source/license.html>.