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pymmh3.py
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'''
pymmh3 was written by Fredrik Kihlander and enhanced by Swapnil Gusani, and is placed in the public
domain. The authors hereby disclaim copyright to this source code.
pure python implementation of the murmur3 hash algorithm
https://code.google.com/p/smhasher/wiki/MurmurHash3
This was written for the times when you do not want to compile c-code and install modules,
and you only want a drop-in murmur3 implementation.
As this is purely python it is FAR from performant and if performance is anything that is needed
a proper c-module is suggested!
This module is written to have the same format as mmh3 python package found here for simple conversions:
https://pypi.python.org/pypi/mmh3/2.3.1
'''
import sys as _sys
if _sys.version_info > (3, 0):
def xrange(a, b, c):
return range(a, b, c)
def xencode(x):
if isinstance(x, bytes) or isinstance(x, bytearray):
return x
else:
return x.encode()
else:
def xencode(x):
return x
del _sys
def hash(key, seed=0x0):
''' Implements 32bit murmur3 hash. '''
key = bytearray(xencode(key))
def fmix(h):
h ^= h >> 16
h = (h * 0x85EBCA6B) & 0xFFFFFFFF
h ^= h >> 13
h = (h * 0xC2B2AE35) & 0xFFFFFFFF
h ^= h >> 16
return h
length = len(key)
nblocks = int(length / 4)
h1 = seed
c1 = 0xCC9E2D51
c2 = 0x1B873593
# body
for block_start in xrange(0, nblocks * 4, 4):
# ??? big endian?
k1 = key[block_start + 3] << 24 | key[block_start + 2] << 16 | key[block_start + 1] << 8 | key[block_start + 0]
k1 = (c1 * k1) & 0xFFFFFFFF
k1 = (k1 << 15 | k1 >> 17) & 0xFFFFFFFF # inlined ROTL32
k1 = (c2 * k1) & 0xFFFFFFFF
h1 ^= k1
h1 = (h1 << 13 | h1 >> 19) & 0xFFFFFFFF # inlined ROTL32
h1 = (h1 * 5 + 0xE6546B64) & 0xFFFFFFFF
# tail
tail_index = nblocks * 4
k1 = 0
tail_size = length & 3
if tail_size >= 3:
k1 ^= key[tail_index + 2] << 16
if tail_size >= 2:
k1 ^= key[tail_index + 1] << 8
if tail_size >= 1:
k1 ^= key[tail_index + 0]
if tail_size > 0:
k1 = (k1 * c1) & 0xFFFFFFFF
k1 = (k1 << 15 | k1 >> 17) & 0xFFFFFFFF # inlined ROTL32
k1 = (k1 * c2) & 0xFFFFFFFF
h1 ^= k1
# finalization
unsigned_val = fmix(h1 ^ length)
if unsigned_val & 0x80000000 == 0:
return unsigned_val
else:
return -((unsigned_val ^ 0xFFFFFFFF) + 1)
def hash128(key, seed=0x0, x64arch=True):
''' Implements 128bit murmur3 hash. '''
def hash128_x64(key, seed):
''' Implements 128bit murmur3 hash for x64. '''
def fmix(k):
k ^= k >> 33
k = (k * 0xFF51AFD7ED558CCD) & 0xFFFFFFFFFFFFFFFF
k ^= k >> 33
k = (k * 0xC4CEB9FE1A85EC53) & 0xFFFFFFFFFFFFFFFF
k ^= k >> 33
return k
length = len(key)
nblocks = int(length / 16)
h1 = seed
h2 = seed
c1 = 0x87C37B91114253D5
c2 = 0x4CF5AD432745937F
# body
for block_start in xrange(0, nblocks * 8, 8):
# ??? big endian?
k1 = (
key[2 * block_start + 7] << 56 |
key[2 * block_start + 6] << 48 |
key[2 * block_start + 5] << 40 |
key[2 * block_start + 4] << 32 |
key[2 * block_start + 3] << 24 |
key[2 * block_start + 2] << 16 |
key[2 * block_start + 1] << 8 |
key[2 * block_start + 0]
)
k2 = (
key[2 * block_start + 15] << 56 |
key[2 * block_start + 14] << 48 |
key[2 * block_start + 13] << 40 |
key[2 * block_start + 12] << 32 |
key[2 * block_start + 11] << 24 |
key[2 * block_start + 10] << 16 |
key[2 * block_start + 9] << 8 |
key[2 * block_start + 8]
)
k1 = (c1 * k1) & 0xFFFFFFFFFFFFFFFF
k1 = (k1 << 31 | k1 >> 33) & 0xFFFFFFFFFFFFFFFF # inlined ROTL64
k1 = (c2 * k1) & 0xFFFFFFFFFFFFFFFF
h1 ^= k1
h1 = (h1 << 27 | h1 >> 37) & 0xFFFFFFFFFFFFFFFF # inlined ROTL64
h1 = (h1 + h2) & 0xFFFFFFFFFFFFFFFF
h1 = (h1 * 5 + 0x52DCE729) & 0xFFFFFFFFFFFFFFFF
k2 = (c2 * k2) & 0xFFFFFFFFFFFFFFFF
k2 = (k2 << 33 | k2 >> 31) & 0xFFFFFFFFFFFFFFFF # inlined ROTL64
k2 = (c1 * k2) & 0xFFFFFFFFFFFFFFFF
h2 ^= k2
h2 = (h2 << 31 | h2 >> 33) & 0xFFFFFFFFFFFFFFFF # inlined ROTL64
h2 = (h1 + h2) & 0xFFFFFFFFFFFFFFFF
h2 = (h2 * 5 + 0x38495AB5) & 0xFFFFFFFFFFFFFFFF
# tail
tail_index = nblocks * 16
k1 = 0
k2 = 0
tail_size = length & 15
if tail_size >= 15:
k2 ^= key[tail_index + 14] << 48
if tail_size >= 14:
k2 ^= key[tail_index + 13] << 40
if tail_size >= 13:
k2 ^= key[tail_index + 12] << 32
if tail_size >= 12:
k2 ^= key[tail_index + 11] << 24
if tail_size >= 11:
k2 ^= key[tail_index + 10] << 16
if tail_size >= 10:
k2 ^= key[tail_index + 9] << 8
if tail_size >= 9:
k2 ^= key[tail_index + 8]
if tail_size > 8:
k2 = (k2 * c2) & 0xFFFFFFFFFFFFFFFF
k2 = (k2 << 33 | k2 >> 31) & 0xFFFFFFFFFFFFFFFF # inlined ROTL64
k2 = (k2 * c1) & 0xFFFFFFFFFFFFFFFF
h2 ^= k2
if tail_size >= 8:
k1 ^= key[tail_index + 7] << 56
if tail_size >= 7:
k1 ^= key[tail_index + 6] << 48
if tail_size >= 6:
k1 ^= key[tail_index + 5] << 40
if tail_size >= 5:
k1 ^= key[tail_index + 4] << 32
if tail_size >= 4:
k1 ^= key[tail_index + 3] << 24
if tail_size >= 3:
k1 ^= key[tail_index + 2] << 16
if tail_size >= 2:
k1 ^= key[tail_index + 1] << 8
if tail_size >= 1:
k1 ^= key[tail_index + 0]
if tail_size > 0:
k1 = (k1 * c1) & 0xFFFFFFFFFFFFFFFF
k1 = (k1 << 31 | k1 >> 33) & 0xFFFFFFFFFFFFFFFF # inlined ROTL64
k1 = (k1 * c2) & 0xFFFFFFFFFFFFFFFF
h1 ^= k1
# finalization
h1 ^= length
h2 ^= length
h1 = (h1 + h2) & 0xFFFFFFFFFFFFFFFF
h2 = (h1 + h2) & 0xFFFFFFFFFFFFFFFF
h1 = fmix(h1)
h2 = fmix(h2)
h1 = (h1 + h2) & 0xFFFFFFFFFFFFFFFF
h2 = (h1 + h2) & 0xFFFFFFFFFFFFFFFF
return h2 << 64 | h1
def hash128_x86(key, seed):
''' Implements 128bit murmur3 hash for x86. '''
def fmix(h):
h ^= h >> 16
h = (h * 0x85EBCA6B) & 0xFFFFFFFF
h ^= h >> 13
h = (h * 0xC2B2AE35) & 0xFFFFFFFF
h ^= h >> 16
return h
length = len(key)
nblocks = int(length / 16)
h1 = seed
h2 = seed
h3 = seed
h4 = seed
c1 = 0x239B961B
c2 = 0xAB0E9789
c3 = 0x38B34AE5
c4 = 0xA1E38B93
# body
for block_start in xrange(0, nblocks * 16, 16):
k1 = (
key[block_start + 3] << 24 |
key[block_start + 2] << 16 |
key[block_start + 1] << 8 |
key[block_start + 0]
)
k2 = (
key[block_start + 7] << 24 |
key[block_start + 6] << 16 |
key[block_start + 5] << 8 |
key[block_start + 4]
)
k3 = (
key[block_start + 11] << 24 |
key[block_start + 10] << 16 |
key[block_start + 9] << 8 |
key[block_start + 8]
)
k4 = (
key[block_start + 15] << 24 |
key[block_start + 14] << 16 |
key[block_start + 13] << 8 |
key[block_start + 12]
)
k1 = (c1 * k1) & 0xFFFFFFFF
k1 = (k1 << 15 | k1 >> 17) & 0xFFFFFFFF # inlined ROTL32
k1 = (c2 * k1) & 0xFFFFFFFF
h1 ^= k1
h1 = (h1 << 19 | h1 >> 13) & 0xFFFFFFFF # inlined ROTL32
h1 = (h1 + h2) & 0xFFFFFFFF
h1 = (h1 * 5 + 0x561CCD1B) & 0xFFFFFFFF
k2 = (c2 * k2) & 0xFFFFFFFF
k2 = (k2 << 16 | k2 >> 16) & 0xFFFFFFFF # inlined ROTL32
k2 = (c3 * k2) & 0xFFFFFFFF
h2 ^= k2
h2 = (h2 << 17 | h2 >> 15) & 0xFFFFFFFF # inlined ROTL32
h2 = (h2 + h3) & 0xFFFFFFFF
h2 = (h2 * 5 + 0x0BCAA747) & 0xFFFFFFFF
k3 = (c3 * k3) & 0xFFFFFFFF
k3 = (k3 << 17 | k3 >> 15) & 0xFFFFFFFF # inlined ROTL32
k3 = (c4 * k3) & 0xFFFFFFFF
h3 ^= k3
h3 = (h3 << 15 | h3 >> 17) & 0xFFFFFFFF # inlined ROTL32
h3 = (h3 + h4) & 0xFFFFFFFF
h3 = (h3 * 5 + 0x96CD1C35) & 0xFFFFFFFF
k4 = (c4 * k4) & 0xFFFFFFFF
k4 = (k4 << 18 | k4 >> 14) & 0xFFFFFFFF # inlined ROTL32
k4 = (c1 * k4) & 0xFFFFFFFF
h4 ^= k4
h4 = (h4 << 13 | h4 >> 19) & 0xFFFFFFFF # inlined ROTL32
h4 = (h1 + h4) & 0xFFFFFFFF
h4 = (h4 * 5 + 0x32AC3B17) & 0xFFFFFFFF
# tail
tail_index = nblocks * 16
k1 = 0
k2 = 0
k3 = 0
k4 = 0
tail_size = length & 15
if tail_size >= 15:
k4 ^= key[tail_index + 14] << 16
if tail_size >= 14:
k4 ^= key[tail_index + 13] << 8
if tail_size >= 13:
k4 ^= key[tail_index + 12]
if tail_size > 12:
k4 = (k4 * c4) & 0xFFFFFFFF
k4 = (k4 << 18 | k4 >> 14) & 0xFFFFFFFF # inlined ROTL32
k4 = (k4 * c1) & 0xFFFFFFFF
h4 ^= k4
if tail_size >= 12:
k3 ^= key[tail_index + 11] << 24
if tail_size >= 11:
k3 ^= key[tail_index + 10] << 16
if tail_size >= 10:
k3 ^= key[tail_index + 9] << 8
if tail_size >= 9:
k3 ^= key[tail_index + 8]
if tail_size > 8:
k3 = (k3 * c3) & 0xFFFFFFFF
k3 = (k3 << 17 | k3 >> 15) & 0xFFFFFFFF # inlined ROTL32
k3 = (k3 * c4) & 0xFFFFFFFF
h3 ^= k3
if tail_size >= 8:
k2 ^= key[tail_index + 7] << 24
if tail_size >= 7:
k2 ^= key[tail_index + 6] << 16
if tail_size >= 6:
k2 ^= key[tail_index + 5] << 8
if tail_size >= 5:
k2 ^= key[tail_index + 4]
if tail_size > 4:
k2 = (k2 * c2) & 0xFFFFFFFF
k2 = (k2 << 16 | k2 >> 16) & 0xFFFFFFFF # inlined ROTL32
k2 = (k2 * c3) & 0xFFFFFFFF
h2 ^= k2
if tail_size >= 4:
k1 ^= key[tail_index + 3] << 24
if tail_size >= 3:
k1 ^= key[tail_index + 2] << 16
if tail_size >= 2:
k1 ^= key[tail_index + 1] << 8
if tail_size >= 1:
k1 ^= key[tail_index + 0]
if tail_size > 0:
k1 = (k1 * c1) & 0xFFFFFFFF
k1 = (k1 << 15 | k1 >> 17) & 0xFFFFFFFF # inlined ROTL32
k1 = (k1 * c2) & 0xFFFFFFFF
h1 ^= k1
# finalization
h1 ^= length
h2 ^= length
h3 ^= length
h4 ^= length
h1 = (h1 + h2) & 0xFFFFFFFF
h1 = (h1 + h3) & 0xFFFFFFFF
h1 = (h1 + h4) & 0xFFFFFFFF
h2 = (h1 + h2) & 0xFFFFFFFF
h3 = (h1 + h3) & 0xFFFFFFFF
h4 = (h1 + h4) & 0xFFFFFFFF
h1 = fmix(h1)
h2 = fmix(h2)
h3 = fmix(h3)
h4 = fmix(h4)
h1 = (h1 + h2) & 0xFFFFFFFF
h1 = (h1 + h3) & 0xFFFFFFFF
h1 = (h1 + h4) & 0xFFFFFFFF
h2 = (h1 + h2) & 0xFFFFFFFF
h3 = (h1 + h3) & 0xFFFFFFFF
h4 = (h1 + h4) & 0xFFFFFFFF
return h4 << 96 | h3 << 64 | h2 << 32 | h1
key = bytearray(xencode(key))
if x64arch:
return hash128_x64(key, seed)
else:
return hash128_x86(key, seed)
def hash64(key, seed=0x0, x64arch=True):
''' Implements 64bit murmur3 hash. Returns a tuple. '''
hash_128 = hash128(key, seed, x64arch)
unsigned_val1 = hash_128 & 0xFFFFFFFFFFFFFFFF
if unsigned_val1 & 0x8000000000000000 == 0:
signed_val1 = unsigned_val1
else:
signed_val1 = -((unsigned_val1 ^ 0xFFFFFFFFFFFFFFFF) + 1)
unsigned_val2 = (hash_128 >> 64) & 0xFFFFFFFFFFFFFFFF
if unsigned_val2 & 0x8000000000000000 == 0:
signed_val2 = unsigned_val2
else:
signed_val2 = -((unsigned_val2 ^ 0xFFFFFFFFFFFFFFFF) + 1)
return (int(signed_val1), int(signed_val2))
def hash_bytes(key, seed=0x0, x64arch=True):
''' Implements 128bit murmur3 hash. Returns a byte string. '''
hash_128 = hash128(key, seed, x64arch)
bytestring = ''
for i in xrange(0, 16, 1):
lsbyte = hash_128 & 0xFF
bytestring = bytestring + str(chr(lsbyte))
hash_128 = hash_128 >> 8
return bytestring
if __name__ == "__main__":
import argparse
parser = argparse.ArgumentParser('pymurmur3', 'pymurmur [options] "string to hash"')
parser.add_argument('--seed', type=int, default=0)
parser.add_argument('strings', default=[], nargs='+')
opts = parser.parse_args()
for str_to_hash in opts.strings:
sys.stdout.write('"%s" = 0x%08X\n' % (str_to_hash, hash(str_to_hash)))