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Allow to construct a 128-bit key from two 64-bit halves #1

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Allow to construct a 128-bit key from two 64-bit halves #1

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16 changes: 16 additions & 0 deletions siphash/__init__.py
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Original file line number Diff line number Diff line change
Expand Up @@ -108,6 +108,11 @@ class SipHash_2_4(object):
>>> SipHash_2_4(b'FEDCBA9876543210').update(b'').update(b'a').hash()
6581475155582014123

>> SipHash_2_4.fromkeyparts(506097522914230528, 1084818905618843912).hash()
8246050544436514353
>> SipHash_2_4.fromkeyparts(506097522914230528, 1084818905618843912, b'a').hash()
3144613055062689994

>>> a = SipHash_2_4(b'FEDCBA9876543210').update(b'a')
>>> a.hash()
6581475155582014123
Expand All @@ -133,6 +138,17 @@ def __init__(self, secret, s=b''):
0x7465646279746573 ^ k1)
self.update(s)

@classmethod
def fromkeyparts(cls, k0, k1, s=b''):
"""
Create a SipHash instance using two 64-bit integers as first (k0)
and second (k1) parts of the resultant 128-bit key.

>> SipHash_2_4.fromkeyparts(506097522914230528, 1084818905618843912).hash()
8246050544436514353
"""
return cls(_twoQ.pack(k0, k1), s=s)

def update(self, s):
s = self.s + s
lim = (len(s)//8)*8
Expand Down