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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](https://131002.net/siphash/siphashdos_29c3_slides.pdf).
It is now used in the hash tables implementation of Python, Ruby, Perl
5, etc.
SipHash was designed by [Jean-Philippe Aumasson](https://131002.net) and
[Daniel J. Bernstein](http://cr.yp.to).
Usage
-----
Running
```sh
make
```
will build sanity checks (test vectors) for SipHash-2-4, the default
version of SipHash:
```C
./siphash24_test
```
verifies 64 test vectors, and
```c
./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
```C
#define cROUNDS 2
#define dROUNDS 4
```
Intellectual property
---------------------
The SipHash reference code is released under [CC0
license](https://creativecommons.org/publicdomain/zero/1.0/), 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.
References
----------
The [SipHash page](https://131002.net/siphash) includes
* a list of third-party implementations and modules
* a list of projects using SipHash
* references to cryptanalysis results
|
