272 lines
8.0 KiB
Markdown
272 lines
8.0 KiB
Markdown
Welcome to the OpenSSL Project
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==============================
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[![openssl logo]][www.openssl.org]
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[![github actions ci badge]][github actions ci]
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[![appveyor badge]][appveyor jobs]
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OpenSSL is a robust, commercial-grade, full-featured Open Source Toolkit
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for the TLS (formerly SSL), DTLS and QUIC (currently client side only)
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protocols.
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The protocol implementations are based on a full-strength general purpose
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cryptographic library, which can also be used stand-alone. Also included is a
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cryptographic module validated to conform with FIPS standards.
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OpenSSL is descended from the SSLeay library developed by Eric A. Young
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and Tim J. Hudson.
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The official Home Page of the OpenSSL Project is [www.openssl.org].
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Table of Contents
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=================
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- [Overview](#overview)
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- [Download](#download)
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- [Build and Install](#build-and-install)
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- [Documentation](#documentation)
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- [License](#license)
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- [Support](#support)
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- [Contributing](#contributing)
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- [Legalities](#legalities)
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Overview
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========
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The OpenSSL toolkit includes:
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- **libssl**
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an implementation of all TLS protocol versions up to TLSv1.3 ([RFC 8446]),
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DTLS protocol versions up to DTLSv1.2 ([RFC 6347]) and
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the QUIC (currently client side only) version 1 protocol ([RFC 9000]).
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- **libcrypto**
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a full-strength general purpose cryptographic library. It constitutes the
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basis of the TLS implementation, but can also be used independently.
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- **openssl**
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the OpenSSL command line tool, a swiss army knife for cryptographic tasks,
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testing and analyzing. It can be used for
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- creation of key parameters
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- creation of X.509 certificates, CSRs and CRLs
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- calculation of message digests
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- encryption and decryption
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- SSL/TLS/DTLS and client and server tests
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- QUIC client tests
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- handling of S/MIME signed or encrypted mail
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- and more...
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Download
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========
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For Production Use
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------------------
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Source code tarballs of the official releases can be downloaded from
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[www.openssl.org/source](https://www.openssl.org/source).
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The OpenSSL project does not distribute the toolkit in binary form.
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However, for a large variety of operating systems precompiled versions
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of the OpenSSL toolkit are available. In particular, on Linux and other
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Unix operating systems, it is normally recommended to link against the
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precompiled shared libraries provided by the distributor or vendor.
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We also maintain a list of third parties that produce OpenSSL binaries for
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various Operating Systems (including Windows) on the [Binaries] page on our
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wiki.
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For Testing and Development
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---------------------------
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Although testing and development could in theory also be done using
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the source tarballs, having a local copy of the git repository with
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the entire project history gives you much more insight into the
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code base.
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The official OpenSSL Git Repository is located at [git.openssl.org].
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There is a GitHub mirror of the repository at [github.com/openssl/openssl],
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which is updated automatically from the former on every commit.
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A local copy of the Git Repository can be obtained by cloning it from
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the original OpenSSL repository using
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git clone git://git.openssl.org/openssl.git
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or from the GitHub mirror using
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git clone https://github.com/openssl/openssl.git
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If you intend to contribute to OpenSSL, either to fix bugs or contribute
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new features, you need to fork the OpenSSL repository openssl/openssl on
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GitHub and clone your public fork instead.
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git clone https://github.com/yourname/openssl.git
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This is necessary because all development of OpenSSL nowadays is done via
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GitHub pull requests. For more details, see [Contributing](#contributing).
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Build and Install
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=================
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After obtaining the Source, have a look at the [INSTALL](INSTALL.md) file for
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detailed instructions about building and installing OpenSSL. For some
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platforms, the installation instructions are amended by a platform specific
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document.
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* [Notes for UNIX-like platforms](NOTES-UNIX.md)
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* [Notes for Android platforms](NOTES-ANDROID.md)
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* [Notes for Windows platforms](NOTES-WINDOWS.md)
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* [Notes for the DOS platform with DJGPP](NOTES-DJGPP.md)
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* [Notes for the OpenVMS platform](NOTES-VMS.md)
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* [Notes on Perl](NOTES-PERL.md)
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* [Notes on Valgrind](NOTES-VALGRIND.md)
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Specific notes on upgrading to OpenSSL 3.x from previous versions can be found
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in the [ossl-guide-migration(7ossl)] manual page.
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Documentation
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=============
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README Files
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------------
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There are some README.md files in the top level of the source distribution
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containing additional information on specific topics.
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* [Information about the OpenSSL QUIC protocol implementation](README-QUIC.md)
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* [Information about the OpenSSL Provider architecture](README-PROVIDERS.md)
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* [Information about using the OpenSSL FIPS validated module](README-FIPS.md)
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* [Information about the legacy OpenSSL Engine architecture](README-ENGINES.md)
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The OpenSSL Guide
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-----------------
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There are some tutorial and introductory pages on some important OpenSSL topics
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within the [OpenSSL Guide].
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Manual Pages
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------------
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The manual pages for the master branch and all current stable releases are
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available online.
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- [OpenSSL master](https://www.openssl.org/docs/manmaster)
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- [OpenSSL 3.0](https://www.openssl.org/docs/man3.0)
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- [OpenSSL 3.1](https://www.openssl.org/docs/man3.1)
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- [OpenSSL 3.2](https://www.openssl.org/docs/man3.2)
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Demos
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-----
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The are numerous source code demos for using various OpenSSL capabilities in the
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[demos subfolder](./demos).
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Wiki
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----
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There is a Wiki at [wiki.openssl.org] which is currently not very active.
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It contains a lot of useful information, not all of which is up-to-date.
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License
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=======
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OpenSSL is licensed under the Apache License 2.0, which means that
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you are free to get and use it for commercial and non-commercial
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purposes as long as you fulfill its conditions.
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See the [LICENSE.txt](LICENSE.txt) file for more details.
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Support
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=======
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There are various ways to get in touch. The correct channel depends on
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your requirement. See the [SUPPORT](SUPPORT.md) file for more details.
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Contributing
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============
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If you are interested and willing to contribute to the OpenSSL project,
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please take a look at the [CONTRIBUTING](CONTRIBUTING.md) file.
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Legalities
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==========
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A number of nations restrict the use or export of cryptography. If you are
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potentially subject to such restrictions, you should seek legal advice before
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attempting to develop or distribute cryptographic code.
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Copyright
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=========
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Copyright (c) 1998-2024 The OpenSSL Project Authors
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Copyright (c) 1995-1998 Eric A. Young, Tim J. Hudson
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All rights reserved.
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<!-- Links -->
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[www.openssl.org]:
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<https://www.openssl.org>
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"OpenSSL Homepage"
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[git.openssl.org]:
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<https://git.openssl.org>
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"OpenSSL Git Repository"
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[git.openssl.org]:
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<https://git.openssl.org>
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"OpenSSL Git Repository"
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[github.com/openssl/openssl]:
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<https://github.com/openssl/openssl>
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"OpenSSL GitHub Mirror"
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[wiki.openssl.org]:
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<https://wiki.openssl.org>
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"OpenSSL Wiki"
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[ossl-guide-migration(7ossl)]:
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<https://www.openssl.org/docs/manmaster/man7/ossl-guide-migration.html>
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"OpenSSL Migration Guide"
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[RFC 8446]:
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<https://tools.ietf.org/html/rfc8446>
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[RFC 6347]:
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<https://tools.ietf.org/html/rfc6347>
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[RFC 9000]:
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<https://tools.ietf.org/html/rfc9000>
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[Binaries]:
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<https://wiki.openssl.org/index.php/Binaries>
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"List of third party OpenSSL binaries"
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[OpenSSL Guide]:
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<https://www.openssl.org/docs/manmaster/man7/ossl-guide-introduction.html>
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"An introduction to OpenSSL"
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<!-- Logos and Badges -->
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[openssl logo]:
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doc/images/openssl.svg
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"OpenSSL Logo"
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[github actions ci badge]:
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<https://github.com/openssl/openssl/workflows/GitHub%20CI/badge.svg>
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"GitHub Actions CI Status"
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[github actions ci]:
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<https://github.com/openssl/openssl/actions?query=workflow%3A%22GitHub+CI%22>
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"GitHub Actions CI"
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[appveyor badge]:
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<https://ci.appveyor.com/api/projects/status/8e10o7xfrg73v98f/branch/master?svg=true>
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"AppVeyor Build Status"
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[appveyor jobs]:
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<https://ci.appveyor.com/project/openssl/openssl/branch/master>
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"AppVeyor Jobs"
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