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This wiki is intended as a place for collecting, organizing, and refining useful information about OpenSSL that is currently strewn among multiple locations and formats.

OpenSSL Quick Links

OpenSSL Overview HTAB.pngHTAB.png Compilation and Installation HTAB.pngHTAB.png Internals HTAB.pngHTAB.png Mailing Lists
libcrypto API HTAB.pngHTAB.png libssl API HTAB.pngHTAB.png Examples HTAB.pngHTAB.png Index of all API functions
License HTAB.pngHTAB.png Command Line Utilities HTAB.pngHTAB.png Related Links HTAB.pngHTAB.png SSL and TLS Protocols
1.1 API Changes HTAB.pngHTAB.png


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This section contains the automagically generated man pages from the OpenSSL git repository, and similar "man" style reference documentation. The man pages are automatically imported from the OpenSSL git repository and local wiki modifications are submitted as patches.

  • OpenSSL Manual Pages
If you wish to edit any of the Manual page content please refer to the Guidelines for Manual Page Authors page.

Usage and Programming

This section has discussions of practical issues in using OpenSSL

  • Building from Source
Where to find it, the different versions, how to build and install it.
Programming techniques and example code
Use of EVP is preferred for most applications and circumstances
More specialized non-EVP usage

Concepts and Theory

Discussions of basic cryptographic theory and concepts Discussions of common operational issues

Security Advisories

Feedback and Contributions

  • Note that manual pages and the FAQ are maintained with the source code.
  • If you are unsure as to whether a feature will be useful for the general OpenSSL community please discuss it on the openssl-dev mailing list first. Someone may be already working on the same thing or there may be a good reason as to why that feature isn't implemented.
  • Submit a pull request for each separate fix (also documented there)
  • Submit a bug report for the issue and reference the pull request
  • Contributing fixes and other improvements to the web site

Internals and Development

This section is for internal details of primary interest to OpenSSL maintainers and power users