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r''' <MIT License> Copyright (c) 2013 Marek Majkowski <marek@popcount.org> Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. </MIT License> SipHash-2-4 implementation, following the 'hashlib' API: >>> key = b'0123456789ABCDEF' >>> SipHash_2_4(key, b'a').hexdigest() b'864c339cb0dc0fac' >>> SipHash_2_4(key, b'a').digest() b'\x86L3\x9c\xb0\xdc\x0f\xac' >>> SipHash_2_4(key, b'a').hash() 12398370950267227270 >>> SipHash_2_4(key).update(b'a').hash() 12398370950267227270 >>> key = b'\x00\x01\x02\x03\x04\x05\x06\x07\x08\t\n\x0b\x0c\r\x0e\x0f' >>> SipHash_2_4(key, b'').hash() 8246050544436514353 >>> SipHash_2_4(key, b'').hexdigest() b'310e0edd47db6f72' ''' import struct import binascii def _doublesipround(v, m): ''' Internal helper. Xors 'm' to 'v3', runs two rounds of siphash on vector 'v' and xors 'm' to 'v0'. >>> _doublesipround((1,2,3,4),0) (9263201270060220426, 2307743542053503000, 5255419393243893904, 10208987565802066018) >>> _doublesipround((1,2,3,4),0xff) (11557575153743626750, 2307780510495171325, 7519994316568162407, 5442382437785464174) >>> _doublesipround((0,0,0,0),0) (0, 0, 0, 0) >>> _doublesipround((0,0,0,0),0xff) (2368684213854535680, 36416423977725, 2305811110491594975, 15626573430810475768) ''' a, b, c, d = v d ^= m e = (a + b) & 0xffffffffffffffff i = (((b & 0x7ffffffffffff) << 13) | (b >> 51)) ^ e f = c + d j = ((((d) << 16) | (d >> 48)) ^ f ) & 0xffffffffffffffff h = (f + i) & 0xffffffffffffffff k = ((e << 32) | (e >> 32)) + j l = (((i & 0x7fffffffffff) << 17) | (i >> 47)) ^ h o = (((j << 21) | (j >> 43)) ^ k) & 0xffffffffffffffff p = (k + l) & 0xffffffffffffffff q = (((l & 0x7ffffffffffff) << 13) | (l >> 51)) ^ p r = ((h << 32) | (h >> 32)) + o s = (((o << 16) | (o >> 48)) ^ r) & 0xffffffffffffffff t = (r + q) & 0xffffffffffffffff u = (((p << 32) | (p >> 32)) + s) & 0xffffffffffffffff return (u ^ m, (((q & 0x7fffffffffff) << 17) | (q >> 47)) ^ t, ((t & 0xffffffff) << 32) | (t >> 32), (((s & 0x7ffffffffff) << 21) | (s >> 43)) ^ u) _zeroes = b'\x00\x00\x00\x00\x00\x00\x00\x00' _oneQ = struct.Struct('<Q') _twoQ = struct.Struct('<QQ') _oneQout = struct.Struct(">Q") class SipHash_2_4(object): r''' >>> SipHash_2_4(b'0123456789ABCDEF', b'a').hash() 12398370950267227270 >>> SipHash_2_4(b'0123456789ABCDEF', b'').hash() 3627314469837380007 >>> SipHash_2_4(b'FEDCBA9876543210', b'').hash() 2007056766899708634 >>> SipHash_2_4(b'FEDCBA9876543210').update(b'').update(b'').hash() 2007056766899708634 >>> SipHash_2_4(b'FEDCBA9876543210', b'a').hash() 6581475155582014123 >>> SipHash_2_4(b'FEDCBA9876543210').update(b'a').hash() 6581475155582014123 >>> SipHash_2_4(b'FEDCBA9876543210').update(b'a').update(b'').hash() 6581475155582014123 >>> SipHash_2_4(b'FEDCBA9876543210').update(b'').update(b'a').hash() 6581475155582014123 >>> a = SipHash_2_4(b'FEDCBA9876543210').update(b'a') >>> a.hash() 6581475155582014123 >>> b = a.copy() >>> a.hash(), b.hash() (6581475155582014123, 6581475155582014123) >>> a.update(b'a') and None >>> a.hash(), b.hash() (3258273892680892829, 6581475155582014123) ''' digest_size = 16 block_size = 64 s = b'' b = 0 def __init__(self, secret, s=b''): k0 = (secret[1] << 32) + secret[0] k1 = (secret[3] << 32) + secret[2] self.v = (0x736f6d6570736575 ^ k0, 0x646f72616e646f6d ^ k1, 0x6c7967656e657261 ^ k0, 0x7465646279746573 ^ k1) self.update(s) def update(self, s): s = self.s + s lim = (len(s)//8)*8 v = self.v off = 0 for off in range(0, lim, 8): m, = _oneQ.unpack_from(s, off) # print 'v0 %016x' % v[0] # print 'v1 %016x' % v[1] # print 'v2 %016x' % v[2] # print 'v3 %016x' % v[3] # print 'compress %016x' % m v = _doublesipround(v, m) self.v = v self.b += lim self.s = s[lim:] return self def hash(self): l = len(self.s) assert l < 8 b = (((self.b + l) & 0xff) << 56) b |= _oneQ.unpack_from(self.s+_zeroes)[0] v = self.v # print 'v0 %016x' % v[0] # print 'v1 %016x' % v[1] # print 'v2 %016x' % v[2] # print 'v3 %016x' % v[3] # print 'padding %016x' % b v = _doublesipround(v, b) # print 'v0 %016x' % v0 # print 'v1 %016x' % v1 # print 'v2 %016x' % v2 # print 'v3 %016x' % v3 v = list(v) v[2] ^= 0xff v = _doublesipround(_doublesipround(v, 0), 0) return v[0] ^ v[1] ^ v[2] ^ v[3] def digest(self): return _oneQout.pack(self.hash()) def hexdigest(self): return binascii.hexlify(self.digest()) def copy(self): n = SipHash_2_4(_zeroes * 2) n.v, n.s, n.b = self.v, self.s, self.b return n siphash24 = SipHash_2_4 SipHash24 = SipHash_2_4 if __name__ == "__main__": # Test vectors as per spec vectors = [c.encode('utf-8') for c in [ "310e0edd47db6f72", "fd67dc93c539f874", "5a4fa9d909806c0d", "2d7efbd796666785", "b7877127e09427cf", "8da699cd64557618", "cee3fe586e46c9cb", "37d1018bf50002ab", "6224939a79f5f593", "b0e4a90bdf82009e", "f3b9dd94c5bb5d7a", "a7ad6b22462fb3f4", "fbe50e86bc8f1e75", "903d84c02756ea14", "eef27a8e90ca23f7", "e545be4961ca29a1", "db9bc2577fcc2a3f", "9447be2cf5e99a69", "9cd38d96f0b3c14b", "bd6179a71dc96dbb", "98eea21af25cd6be", "c7673b2eb0cbf2d0", "883ea3e395675393", "c8ce5ccd8c030ca8", "94af49f6c650adb8", "eab8858ade92e1bc", "f315bb5bb835d817", "adcf6b0763612e2f", "a5c91da7acaa4dde", "716595876650a2a6", "28ef495c53a387ad", "42c341d8fa92d832", "ce7cf2722f512771", "e37859f94623f3a7", "381205bb1ab0e012", "ae97a10fd434e015", "b4a31508beff4d31", "81396229f0907902", "4d0cf49ee5d4dcca", "5c73336a76d8bf9a", "d0a704536ba93e0e", "925958fcd6420cad", "a915c29bc8067318", "952b79f3bc0aa6d4", "f21df2e41d4535f9", "87577519048f53a9", "10a56cf5dfcd9adb", "eb75095ccd986cd0", "51a9cb9ecba312e6", "96afadfc2ce666c7", "72fe52975a4364ee", "5a1645b276d592a1", "b274cb8ebf87870a", "6f9bb4203de7b381", "eaecb2a30b22a87f", "9924a43cc1315724", "bd838d3aafbf8db7", "0b1a2a3265d51aea", "135079a3231ce660", "932b2846e4d70666", "e1915f5cb1eca46c", "f325965ca16d629f", "575ff28e60381be5", "724506eb4c328a95", ]] key = ''.join(chr(i) for i in range(16)).encode('utf-8') plaintext = ''.join(chr(i) for i in range(64)).encode('utf-8') for i in range(64): assert SipHash_2_4(key, plaintext[:i]).hexdigest() == vectors[i], \ 'failed on test no %i' % i # Internal doctests # # To maintain compatibility with both python 2.x and 3.x in tests # we need to do a trick. Python 2.x doesn't like b'' notation, # Python 3.x doesn't have 2222L long integers notation. To # overcome that we'll pipe both results as well as the intended # doctest output through an `eval` function before comparison. To # do it we need to monkeypatch the OutputChecker: import doctest EVAL_FLAG = doctest.register_optionflag("EVAL") OrigOutputChecker = doctest.OutputChecker def relaxed_eval(s): if s.strip(): return eval(s) else: return None class MyOutputChecker: def __init__(self): self.orig = OrigOutputChecker() def check_output(self, want, got, optionflags): if optionflags & EVAL_FLAG: return relaxed_eval(got) == relaxed_eval(want) else: return self.orig.check_output(want, got, optionflags) def output_difference(self, example, got, optionflags): return self.orig.output_difference(example, got, optionflags) doctest.OutputChecker = MyOutputChecker # Monkey patching done. Go for doctests: if doctest.testmod(optionflags=EVAL_FLAG)[0] == 0: print("all tests ok")