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siphash - python siphash implementation

Project description


A Python implementation of [SipHash](, a
fast short-input PRF.

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


`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()

>>> siphash.SipHash_2_4(key, 'a').hash()

To extract the hash as a numeric value call `hash()`:

>>> siphash.SipHash_2_4(key, 'a').hash()

Or `digest()` to get a raw 8-bytes string:
>>> siphash.SipHash_2_4(key, 'a').digest()

Or `hexdigest()` for a 16-bytes hex encoding:
>>> siphash.SipHash_2_4(key, 'a').hexdigest()


A series of sanity checks are present inline the main `pysiphash`
code, to run it type:

$ python siphash/
all tests ok


Currently `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.

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