ssl(7) - phpMan

SSL(7SSL) OpenSSL SSL(7SSL)

NAME
ssl - OpenSSL SSL/TLS library

SYNOPSIS
See the individual manual pages for details.

DESCRIPTION
The OpenSSL ssl library implements several versions of the Secure Sockets Layer, Transport
Layer Security, and Datagram Transport Layer Security protocols. This page gives a brief
overview of the extensive API and data types provided by the library.

An SSL_CTX object is created as a framework to establish TLS/SSL enabled connections (see
SSL_CTX_new(3)). Various options regarding certificates, algorithms etc. can be set in
this object.

When a network connection has been created, it can be assigned to an SSL object. After the
SSL object has been created using SSL_new(3), SSL_set_fd(3) or SSL_set_bio(3) can be used
to associate the network connection with the object.

When the TLS/SSL handshake is performed using SSL_accept(3) or SSL_connect(3)
respectively. SSL_read_ex(3), SSL_read(3), SSL_write_ex(3) and SSL_write(3) are used to
read and write data on the TLS/SSL connection. SSL_shutdown(3) can be used to shut down
the TLS/SSL connection.

DATA STRUCTURES
Here are some of the main data structures in the library.

SSL_METHOD (SSL Method)
This is a dispatch structure describing the internal ssl library methods/functions
which implement the various protocol versions (SSLv3 TLSv1, ...). It's needed to
create an SSL_CTX.

SSL_CIPHER (SSL Cipher)
This structure holds the algorithm information for a particular cipher which are a
core part of the SSL/TLS protocol. The available ciphers are configured on a SSL_CTX
basis and the actual ones used are then part of the SSL_SESSION.

SSL_CTX (SSL Context)
This is the global context structure which is created by a server or client once per
program life-time and which holds mainly default values for the SSL structures which
are later created for the connections.

SSL_SESSION (SSL Session)
This is a structure containing the current TLS/SSL session details for a connection:
SSL_CIPHERs, client and server certificates, keys, etc.

SSL (SSL Connection)
This is the main SSL/TLS structure which is created by a server or client per
established connection. This actually is the core structure in the SSL API. At run-
time the application usually deals with this structure which has links to mostly all
other structures.

HEADER FILES
Currently the OpenSSL ssl library provides the following C header files containing the
prototypes for the data structures and functions:

<openssl/ssl.h>
This is the common header file for the SSL/TLS API. Include it into your program to
make the API of the ssl library available. It internally includes both more private
SSL headers and headers from the crypto library. Whenever you need hard-core details
on the internals of the SSL API, look inside this header file. This file also
includes the others listed below.

<openssl/ssl2.h>
Unused. Present for backwards compatibility only.

<openssl/ssl3.h>
This is the sub header file dealing with the SSLv3 protocol only.

<openssl/tls1.h>
This is the sub header file dealing with the TLSv1 protocol only.

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>.

3.0.2 2024-08-20 SSL(7SSL)

Generated by $Id: phpMan.php,v 4.55 2007/09/05 04:42:51 chedong Exp $ Author: Che Dong
On Apache
Under GNU General Public License
2024-12-04 00:22 @18.219.0.67 CrawledBy Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)