1 Welcome to the OpenSSL Project
2 ==============================
4 [![openssl logo][]][www.openssl.org]
6 [![travis badge][]][travis jobs]
7 [![appveyor badge][]][appveyor jobs]
9 OpenSSL is a robust, commercial-grade, full-featured Open Source Toolkit
10 for the Transport Layer Security (TLS) protocol formerly known as the
11 Secure Sockets Layer (SSL) protocol. The protocol implementation is based
12 on a full-strength general purpose cryptographic library, which can also
15 OpenSSL is descended from the SSLeay library developed by Eric A. Young
18 The official Home Page of the OpenSSL Project is [www.openssl.org][].
23 - [Overview](#overview)
24 - [Download](#download)
25 - [Build and Install](#build-and-install)
26 - [Documentation](#documentation)
29 - [Contributing](#contributing)
30 - [Legalities](#legalities)
35 The OpenSSL toolkit includes:
38 an implementation of all TLS protocol versions up to TLSv1.3 ([RFC 8446][]).
41 a full-strength general purpose cryptographic library. It constitutes the
42 basis of the TLS implementation, but can also be used independently.
45 the OpenSSL command line tool, a swiss army knife for cryptographic tasks,
46 testing and analyzing. It can be used for
47 - creation of key parameters
48 - creation of X.509 certificates, CSRs and CRLs
49 - calculation of message digests
50 - encryption and decryption
51 - SSL/TLS client and server tests
52 - handling of S/MIME signed or encrypted mail
61 Source code tarballs of the official releases can be downloaded from
62 [www.openssl.org/source](https://www.openssl.org/source).
63 The OpenSSL project does not distribute the toolkit in binary form.
65 However, for a large variety of operating systems precompiled versions
66 of the OpenSSL toolkit are available. In particular on Linux and other
67 Unix operating systems it is normally recommended to link against the
68 precompiled shared libraries provided by the distributor or vendor.
70 For Testing and Development
71 ---------------------------
73 Although testing and development could in theory also be done using
74 the source tarballs, having a local copy of the git repository with
75 the entire project history gives you much more insight into the
78 The official OpenSSL Git Repository is located at [git.openssl.org][].
79 There is a GitHub mirror of the repository at [github.com/openssl/openssl][],
80 which is updated automatically from the former on every commit.
82 A local copy of the Git Repository can be obtained by cloning it from
83 the original OpenSSL repository using
85 git clone git://git.openssl.org/openssl.git
87 or from the GitHub mirror using
89 git clone https://github.com/openssl/openssl.git
91 If you intend to contribute to OpenSSL, either to fix bugs or contribute
92 new features, you need to fork the OpenSSL repository openssl/openssl on
93 GitHub and clone your public fork instead.
95 git clone https://github.com/yourname/openssl.git
97 This is necessary, because all development of OpenSSL nowadays is done via
98 GitHub pull requests. For more details, see [Contributing](#contributing).
103 After obtaining the Source, have a look at the [INSTALL](INSTALL.md) file for
104 detailed instructions about building and installing OpenSSL. For some
105 platforms, the installation instructions are amended by a platform specific
108 * [NOTES.ANDROID](NOTES.ANDROID)
109 * [NOTES.DJGPP](NOTES.DJGPP)
110 * [NOTES.PERL](NOTES.PERL)
111 * [NOTES.UNIX](NOTES.UNIX)
112 * [NOTES.VALGRIND](NOTES.VALGRIND)
113 * [NOTES.VMS](NOTES.VMS)
114 * [NOTES.WIN](NOTES.WIN)
116 Specific notes on upgrading to OpenSSL 3.0 from previous versions, as well as
117 known issues are available on the OpenSSL
118 [wiki](https://wiki.openssl.org/index.php/OpenSSL_3.0).
126 The manual pages for the master branch and all current stable releases are
129 - [OpenSSL master](https://www.openssl.org/docs/manmaster)
130 - [OpenSSL 1.1.1](https://www.openssl.org/docs/man1.1.1)
135 There is a Wiki at [wiki.openssl.org][] which is currently not very active.
136 It contains a lot of useful information, not all of which is up to date.
141 OpenSSL is licensed under the Apache License 2.0, which means that
142 you are free to get and use it for commercial and non-commercial
143 purposes as long as you fulfill its conditions.
145 See the [LICENSE](LICENSE) file for more details.
150 There are various ways to get in touch. The correct channel depends on
151 your requirement. see the [SUPPORT](SUPPORT.md) file for more details.
156 If you are interested and willing to contribute to the OpenSSL project,
157 please take a look at the [CONTRIBUTING](CONTRIBUTING.md) file.
159 Since 2016, development takes place in public on the GitHub open source
160 platform. The OpenSSL Project Pages at [openssl.github.io][] are a
161 valuable source of information if you want to get familiar with our
162 development process on GitHub.
167 A number of nations restrict the use or export of cryptography. If you are
168 potentially subject to such restrictions you should seek legal advice before
169 attempting to develop or distribute cryptographic code.
174 Copyright (c) 1998-2020 The OpenSSL Project
176 Copyright (c) 1995-1998 Eric A. Young, Tim J. Hudson
183 <https://www.openssl.org>
187 <https://git.openssl.org>
188 "OpenSSL Git Repository"
191 <https://git.openssl.org>
192 "OpenSSL Git Repository"
194 [github.com/openssl/openssl]:
195 <https://github.com/openssl/openssl>
196 "OpenSSL GitHub Mirror"
199 <https://mspncp.github.io>
200 "OpenSSL Project Pages"
203 <https://wiki.openssl.org>
207 <https://tools.ietf.org/html/rfc8446>
209 <!-- Logos and Badges -->
211 Note: The security token for the appveyor badge (the random number in
212 the URL below) was obtained for the mspncp/openssl project.
213 It needs to be replaced by the correct token by some core member
214 (@levitte, @mattcaswell?). It can be obtained for project members at
215 https://ci.appveyor.com/project/openssl/openssl/settings/badges.
219 doc/images/openssl.svg
223 <https://travis-ci.org/openssl/openssl.svg?branch=master>
224 "Travis Build Status"
227 <https://travis-ci.org/openssl/openssl>
231 <https://ci.appveyor.com/api/projects/status/ikn2l4u1xsume63u/branch/master?svg=true>
232 "AppVeyor Build Status"
235 <https://ci.appveyor.com/project/openssl/openssl/branch/master>