++mug
murmur3 scrambler
Hashes a with the 31-bit murmur3 non-cryptographic hash algorithm,
producing an atom.
Accepts
a is a noun.
Produces
An atom.
Source
++ mug
~/ %mug
|= a=*
|^ ?@ a (mum 0xcafe.babe 0x7fff a)
=/ b (cat 5 $(a -.a) $(a +.a))
(mum 0xdead.beef 0xfffe b)
::
++ mum
|= [syd=@uxF fal=@F key=@]
=/ wyd (met 3 key)
=| i=@ud
|- ^- @F
?: =(8 i) fal
=/ haz=@F (muk syd wyd key)
=/ ham=@F (mix (rsh [0 31] haz) (end [0 31] haz))
?.(=(0 ham) ham $(i +(i), syd +(syd)))
--
Examples
> (mug 10.000)
795.713.195> (mug 10.001)
420.521.697> (mug 1)
1.901.865.568> (mug (some 10))
750.200.080> (mug [1 2 3 4 5 ~])
1.565.443.491++muk
Standard MurmurHash3
Implementation of the 32-bit
MurmurHash3
non-cryptographic hash algorithm. Takes syd as the seed, len as the key length
in blocks of size 3, and key as the key, producing an atom.
Accepts
syd is an atom.
len is an atom.
key is an atom.
Produces
An atom.
Source
++ muk :: standard murmur3
~% %muk ..muk ~
=+ ~(. fe 5)
|= [syd=@ len=@ key=@]
=. syd (end 5 syd)
=/ pad (sub len (met 3 key))
=/ data (weld (rip 3 key) (reap pad 0))
=/ nblocks (div len 4) :: intentionally off-by-one
=/ h1 syd
=+ [c1=0xcc9e.2d51 c2=0x1b87.3593]
=/ blocks (rip 5 key)
=/ i nblocks
=. h1 =/ hi h1 |-
?: =(0 i) hi
=/ k1 (snag (sub nblocks i) blocks) :: negative array index
=. k1 (sit (mul k1 c1))
=. k1 (rol 0 15 k1)
=. k1 (sit (mul k1 c2))
=. hi (mix hi k1)
=. hi (rol 0 13 hi)
=. hi (sum (sit (mul hi 5)) 0xe654.6b64)
$(i (dec i))
=/ tail (slag (mul 4 nblocks) data)
=/ k1 0
=/ tlen (dis len 3)
=. h1
?+ tlen h1 :: fallthrough switch
%3 =. k1 (mix k1 (lsh [0 16] (snag 2 tail)))
=. k1 (mix k1 (lsh [0 8] (snag 1 tail)))
=. k1 (mix k1 (snag 0 tail))
=. k1 (sit (mul k1 c1))
=. k1 (rol 0 15 k1)
=. k1 (sit (mul k1 c2))
(mix h1 k1)
%2 =. k1 (mix k1 (lsh [0 8] (snag 1 tail)))
=. k1 (mix k1 (snag 0 tail))
=. k1 (sit (mul k1 c1))
=. k1 (rol 0 15 k1)
=. k1 (sit (mul k1 c2))
(mix h1 k1)
%1 =. k1 (mix k1 (snag 0 tail))
=. k1 (sit (mul k1 c1))
=. k1 (rol 0 15 k1)
=. k1 (sit (mul k1 c2))
(mix h1 k1)
==
=. h1 (mix h1 len)
|^ (fmix32 h1)
++ fmix32
|= h=@
=. h (mix h (rsh [0 16] h))
=. h (sit (mul h 0x85eb.ca6b))
=. h (mix h (rsh [0 13] h))
=. h (sit (mul h 0xc2b2.ae35))
=. h (mix h (rsh [0 16] h))
h
--
Examples
> (muk 6 1 3)
3.427.677.118
> (muk 6 2 'jerry')
! exit
> (muk 6 2 'je')
3.602.081.716
> (met 3 'jerry')
5
> (met 3 'je')
2
> (muk 6 5 'jerry')
1.276.447.489
> (muk 6 15 'jerry')
2.881.503.571
> =e (cut 3 [0 2] eny) :: `eny` is 512 bits of entropy (a random number).
> e
44.228
> (muk e 11 10.000)
246.077.549