Extract from the description:
SipHash is a family of pseudorandom functions (a.k.a. keyed hash functions) optimized for speed on short messages. Target applications include network traffic authentication and defense against hash-flooding DoS attacks. SipHash is secure, fast, and simple (for real): * SipHash is simpler and faster than previous cryptographic algorithms (e.g. MACs based on universal hashing) * SipHash is competitive in performance with insecure non-cryptographic algorithms (e.g. MurmurHash) * We propose that hash tables switch to SipHash as a hash function. Users of SipHash already include OpenDNS, Perl 5, Ruby, or Rust.
Pysiphash is tested on Python 2.7 and Python 3.2.
Introductory blog post: https://idea.popcount.org/2013-01-24-siphash/
pysiphash versions are available on
pypi. To install it use
$ pip install siphash
$ easy_install siphash
Pysiphash tries to follow the
hashlib API. You can
add data to the hash by calling an
update method, or feed data
directly to the constructor:
>>> import siphash >>> key = '0123456789ABCDEF' >>> sip = siphash.SipHash_2_4(key) >>> sip.update('a') >>> sip.hash() 12398370950267227270L >>> siphash.SipHash_2_4(key, 'a').hash() 12398370950267227270L
To extract the hash as a numeric value call
>>> siphash.SipHash_2_4(key, 'a').hash() 12398370950267227270L
digest() to get a raw 8-bytes string:
>>> siphash.SipHash_2_4(key, 'a').digest() '\x86L3\x9c\xb0\xdc\x0f\xac'
hexdigest() for a 16-bytes hex encoding:
>>> siphash.SipHash_2_4(key, 'a').hexdigest() '864c339cb0dc0fac'
A series of sanity checks are present inline the main
code, to run it type:
$ python siphash/__init__.py all tests ok
pysiphash is a pure-python code, so don't expect blazing
speed. On my machine computing a hash from a ten byte string takes
around 0.31 ms, and hashing 1MiB blob takes 770 ms.