This is a maintenance fork of a C implementation of the SipHash algorithm

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SipHash

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.

Usage

Running

  make

will build sanity checks (test vectors) for SipHash-2-4, the default version of SipHash:

  ./siphash24_test

verifies 64 test vectors, and

  ./siphash24_test_debug

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

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