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117 lines
3.6 KiB
Plaintext
117 lines
3.6 KiB
Plaintext
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=pod
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=head1 NAME
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ssl - OpenSSL SSL/TLS library
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=head1 SYNOPSIS
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See the individual manual pages for details.
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=head1 DESCRIPTION
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The OpenSSL B<ssl> library implements several versions of the
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Secure Sockets Layer, Transport Layer Security, and Datagram Transport Layer
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Security protocols.
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This page gives a brief overview of the extensive API and data types
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provided by the library.
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An B<SSL_CTX> object is created as a framework to establish
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TLS/SSL enabled connections (see L<SSL_CTX_new(3)>).
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Various options regarding certificates, algorithms etc. can be set
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in this object.
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When a network connection has been created, it can be assigned to an
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B<SSL> object. After the B<SSL> object has been created using
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L<SSL_new(3)>, L<SSL_set_fd(3)> or
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L<SSL_set_bio(3)> can be used to associate the network
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connection with the object.
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When the TLS/SSL handshake is performed using
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L<SSL_accept(3)> or L<SSL_connect(3)>
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respectively.
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L<SSL_read_ex(3)>, L<SSL_read(3)>, L<SSL_write_ex(3)> and L<SSL_write(3)> are
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used to read and write data on the TLS/SSL connection.
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L<SSL_shutdown(3)> can be used to shut down the
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TLS/SSL connection.
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=head1 DATA STRUCTURES
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Here are some of the main data structures in the library.
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=over 4
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=item B<SSL_METHOD> (SSL Method)
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This is a dispatch structure describing the internal B<ssl> library
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methods/functions which implement the various protocol versions (SSLv3
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TLSv1, ...). It's needed to create an B<SSL_CTX>.
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=item B<SSL_CIPHER> (SSL Cipher)
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This structure holds the algorithm information for a particular cipher which
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are a core part of the SSL/TLS protocol. The available ciphers are configured
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on a B<SSL_CTX> basis and the actual ones used are then part of the
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B<SSL_SESSION>.
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=item B<SSL_CTX> (SSL Context)
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This is the global context structure which is created by a server or client
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once per program life-time and which holds mainly default values for the
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B<SSL> structures which are later created for the connections.
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=item B<SSL_SESSION> (SSL Session)
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This is a structure containing the current TLS/SSL session details for a
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connection: B<SSL_CIPHER>s, client and server certificates, keys, etc.
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=item B<SSL> (SSL Connection)
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This is the main SSL/TLS structure which is created by a server or client per
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established connection. This actually is the core structure in the SSL API.
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At run-time the application usually deals with this structure which has
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links to mostly all other structures.
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=back
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=head1 HEADER FILES
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Currently the OpenSSL B<ssl> library provides the following C header files
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containing the prototypes for the data structures and functions:
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=over 4
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=item F<< <openssl/ssl.h> >>
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This is the common header file for the SSL/TLS API. Include it into your
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program to make the API of the B<ssl> library available. It internally
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includes both more private SSL headers and headers from the B<crypto> library.
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Whenever you need hard-core details on the internals of the SSL API, look
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inside this header file.
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This file also includes the others listed below.
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=item F<< <openssl/ssl2.h> >>
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Unused. Present for backwards compatibility only.
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=item F<< <openssl/ssl3.h> >>
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This is the sub header file dealing with the SSLv3 protocol only.
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=item F<< <openssl/tls1.h> >>
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This is the sub header file dealing with the TLSv1 protocol only.
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=back
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=head1 COPYRIGHT
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Copyright 2000-2018 The OpenSSL Project Authors. All Rights Reserved.
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Licensed under the Apache License 2.0 (the "License"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file LICENSE in the source distribution or at
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L<https://www.openssl.org/source/license.html>.
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=cut
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