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Monday, 27 June 2016


my fork of siphash to use it as a minimum code-size secure hash (the emphasis is on code size, not speed).
Reference implementation of SipHash, a family of pseudorandom functions optimized for speed on short messages.
SipHash was designed as a mitigation to hash-flooding DoS attacks. It is now used in the hash tables implementation of Python, Ruby, Perl 5, etc.
SipHash was designed by Jean-Philippe Aumasson and Daniel J. Bernstein.


will build sanity checks (test vectors) for SipHash-2-4, the default version of SipHash:
verifies 64 test vectors, and
does the same and prints intermediate values.
The code can be adapted to implement SipHash-c-d, the version of SipHash with c compression rounds and d finalization rounds, by tweaking the lines
#define cROUNDS 2
#define dROUNDS 4
Obviously, if the number of rounds is modified then the test vectors won't verify.

128-bit tags (experimental)

In addition to the original SipHash, which returns 64-bit tags, this reference code implements an experimental mode to return 128-bit tags. This mode is enabled when the constant DOUBLE is defined.
  make double
will build siphash24_test_double and siphash24_debug_double.
The 128-bit mode is experimental, use at your own risk.

Intellectual property

The SipHash reference code is released under CC0 license, a public domain-like licence.
We aren't aware of any patents or patent applications relevant to SipHash, and we aren't planning to apply for any.


The SipHash page includes
  • a list of third-party implementations and modules
  • a list of projects using SipHash
  • references to cryptanalysis results.