SipHash
High-speed secure pseudorandom function for short messages
Tech stack & purpose
SipHash is a C implementation of a family of pseudorandom functions optimized for speed on short messages, designed as a cryptographic defense against hash-flooding denial-of-service attacks. Created in 2012 by Jean-Philippe Aumasson and Daniel J. Bernstein, the project provides reference C code that is portable and prioritized for clarity and debugging. The implementation supports multiple variants including the standard SipHash-2-4, conservative SipHash-4-8, 128-bit output versions, and HalfSipHash for 32-bit word operations, with the code adaptable to different numbers of compression and finalization rounds via compiler flags. As a secure message authentication code and keyed hash function, SipHash has seen widespread integration across operating systems, programming languages, cryptographic libraries, and applications including the Linux kernel, Python, OpenSSL, and WireGuard.
Languages
Contributors
- JP Aumasson40 commits
- Jean-Philippe Aumasson22 commits
- Kyle Altendorf12 commits
- Nihal Jere2 commits
- JP2 commits · 27 followers
- Henriquelay1 commits
- Jens Alfke1 commits
- Jose Fernando Lopez Fernandez1 commits
- Dmitry Chestnykh1 commits
- Dev1 commits
- Jason A. Donenfeld1 commits
- Přemysl Eric Janouch1 commits
- Max Davitt1 commits
