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2 months ago | |
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.gitignore | 1 year ago | |
LICENSE | 7 years ago | |
README.md | 2 months ago | |
halfsiphash.c | 1 year ago | |
makefile | 1 year ago | |
siphash.c | 1 year ago | |
test.c | 1 year ago | |
testmain.c | 1 year ago | |
vectors.h | 4 years ago |
This is a maintenance fork
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.
Running
make
will build tests for
./test
verifies 64 test vectors, and
./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 defining cROUNDS
or dROUNDS
when compiling. This can be done with -D
command line arguments
to many compilers such as below.
gcc -Wall --std=c99 -DcROUNDS=2 -DdROUNDS=4 siphash.c halfsiphash.c test.c -o test
The makefile
also takes c and d rounds values as parameters.
make cROUNDS=2 dROUNDS=4
Obviously, if the number of rounds is modified then the test vectors won’t verify.
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