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This is the OpenSSL wiki. The main site is . 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 locations and formats.

OpenSSL Quick Links[edit]

OpenSSL Overview HTAB.pngHTAB.png Compilation and Installation HTAB.pngHTAB.png Configuration "packages" HTAB.pngHTAB.png Internals
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 Binaries
SSL and TLS Protocols HTAB.pngHTAB.png 1.1 API Changes HTAB.pngHTAB.png FIPS modules HTAB.pngHTAB.png TLS1.3
Mailing Lists HTAB.pngHTAB.png OpenSSL 3.0 HTAB.pngHTAB.png HTAB.pngHTAB.png


Site guidelines, legal and admininstrative issues.

Wiki User's Guide, Configuration settings list, MediaWiki FAQ, MediaWiki Mailing List


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.

Usage and Programming[edit]

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
Creating an OpenSSL Engine to use indigenous ECDH ECDSA and HASH Algorithms
More specialized non-EVP usage

Concepts and Theory[edit]

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

Security Advisories[edit]

Feedback and Contributions[edit]

  • If you are unsure as to whether a feature will be useful for the general OpenSSL community please discuss it on the openssl-users 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.
  • Follow the instructions for accessing source code in the appropriate branches. Note that manual pages and the FAQ are maintained with the source code.
  • Submit a pull request for each separate fix (also documented there)
  • Submit a bug report (see second bullet, above) and reference the pull request. Or you can attach the patch to the ticket.
  • Contributing fixes and other improvements to the web site

Internals and Development[edit]

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