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2 days ago · OpenSSL is a free and open-source software for general-purpose cryptography and secure communication. Learn about the project, its team, its news, its licenses, and its vulnerabilities.
- Downloads: Source Code
Other OpenSSL Releases MAY use the validated FIPS provider,...
- Docs
Documentation. A good starting point for understanding some...
- Policies
The OpenSSL project is managed by the OpenSSL Management...
- Community
Community. OpenSSL source is maintained by a team of...
- Support
Commercial Support. In addition to joining the community,...
- Roadmap
OpenSSL project roadmap. Updated: 11 January 2024. Please...
- OpenSSL 1.1.1 End of Life
OpenSSL 1.1.1 is a Long Term Support (LTS) release. Our...
- Sponsor Acknowledgements
The OpenSSL project depends on volunteer efforts and...
- Downloads: Source Code
- Overview
- Table of Contents
- For Production Use
- For Testing and Development
- Build and Install
- README Files
- The OpenSSL Guide
- Manual Pages
- Demos
- Wiki
- GeneratedCaptionsTabForHeroSec
OpenSSL is a robust, commercial-grade, full-featured Open Source Toolkit for the TLS (formerly SSL), DTLS and QUIC (currently client side only) protocols.
The protocol implementations are based on a full-strength general purpose cryptographic library, which can also be used stand-alone. Also included is a cryptographic module validated to conform with FIPS standards.
OpenSSL is descended from the SSLeay library developed by Eric A. Young and Tim J. Hudson.
The official Home Page of the OpenSSL Project is www.openssl.org.
Source code tarballs of the official releases can be downloaded from www.openssl.org/source. The OpenSSL project does not distribute the toolkit in binary form.
However, for a large variety of operating systems precompiled versions of the OpenSSL toolkit are available. In particular, on Linux and other Unix operating systems, it is normally recommended to link against the precompiled shared libraries provided by the distributor or vendor.
Although testing and development could in theory also be done using the source tarballs, having a local copy of the git repository with the entire project history gives you much more insight into the code base.
The official OpenSSL Git Repository is located at git.openssl.org. There is a GitHub mirror of the repository at github.com/openssl/openssl, which is updated automatically from the former on every commit.
A local copy of the Git Repository can be obtained by cloning it from the original OpenSSL repository using
or from the GitHub mirror using
If you intend to contribute to OpenSSL, either to fix bugs or contribute new features, you need to fork the OpenSSL repository openssl/openssl on GitHub and clone your public fork instead.
This is necessary because all development of OpenSSL nowadays is done via GitHub pull requests. For more details, see Contributing.
After obtaining the Source, have a look at the INSTALL file for detailed instructions about building and installing OpenSSL. For some platforms, the installation instructions are amended by a platform specific document.
•Notes for UNIX-like platforms
•Notes for Android platforms
•Notes for Windows platforms
•Notes for the DOS platform with DJGPP
•Notes for the OpenVMS platform
There are some README.md files in the top level of the source distribution containing additional information on specific topics.
•Information about the OpenSSL QUIC protocol implementation
•Information about the OpenSSL Provider architecture
•Information about using the OpenSSL FIPS validated module
There are some tutorial and introductory pages on some important OpenSSL topics within the OpenSSL Guide.
The manual pages for the master branch and all current stable releases are available online.
•OpenSSL master
•OpenSSL 3.0
•OpenSSL 3.1
The are numerous source code demos for using various OpenSSL capabilities in the demos subfolder.
There is a Wiki at wiki.openssl.org which is currently not very active. It contains a lot of useful information, not all of which is up-to-date.
OpenSSL is a toolkit for the TLS, DTLS and QUIC protocols, based on a general purpose cryptographic library. Learn how to download, build, install, use and contribute to OpenSSL on various platforms and operating systems.
Website. www .openssl .org. OpenSSL is a software library for applications that provide secure communications over computer networks against eavesdropping, and identify the party at the other end. It is widely used by Internet servers, including the majority of HTTPS websites .
Learn how to use the most common OpenSSL commands to generate keys, CSRs, and certificates. This guide covers key algorithms, sizes, passphrases, and more.
Feb 16, 2021 · This is the OpenSSL wiki. The main site is https://www.openssl.org . If this is your first visit or to get an account please see the Welcome page. Your participation and Contributions are valued. This wiki is intended as a place for collecting, organizing, and refining useful information about OpenSSL that is currently strewn among multiple ...
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Nov 23, 2023 · We are pleased to announce the immediate availability of OpenSSL 3.2.0. OpenSSL 3.2.0 is the first General Availability release of the OpenSSL 3.2 release line, and incorporates a number of new features, including: Client-side QUIC support, including support for multiple streams (RFC 9000)
Oct 9, 2023 · Learn how to develop OpenSSL applications using TLS or QUIC with the new guide and code samples. The guide covers core concepts, blocking and non-blocking clients, and multi-stream capabilities of QUIC.
