ripemd160.py raw
1 # Copyright (c) 2021 Pieter Wuille
2 # Distributed under the MIT software license, see the accompanying
3 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
4 """Test-only pure Python RIPEMD160 implementation."""
5
6 import unittest
7
8 # Message schedule indexes for the left path.
9 ML = [
10 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
11 7, 4, 13, 1, 10, 6, 15, 3, 12, 0, 9, 5, 2, 14, 11, 8,
12 3, 10, 14, 4, 9, 15, 8, 1, 2, 7, 0, 6, 13, 11, 5, 12,
13 1, 9, 11, 10, 0, 8, 12, 4, 13, 3, 7, 15, 14, 5, 6, 2,
14 4, 0, 5, 9, 7, 12, 2, 10, 14, 1, 3, 8, 11, 6, 15, 13
15 ]
16
17 # Message schedule indexes for the right path.
18 MR = [
19 5, 14, 7, 0, 9, 2, 11, 4, 13, 6, 15, 8, 1, 10, 3, 12,
20 6, 11, 3, 7, 0, 13, 5, 10, 14, 15, 8, 12, 4, 9, 1, 2,
21 15, 5, 1, 3, 7, 14, 6, 9, 11, 8, 12, 2, 10, 0, 4, 13,
22 8, 6, 4, 1, 3, 11, 15, 0, 5, 12, 2, 13, 9, 7, 10, 14,
23 12, 15, 10, 4, 1, 5, 8, 7, 6, 2, 13, 14, 0, 3, 9, 11
24 ]
25
26 # Rotation counts for the left path.
27 RL = [
28 11, 14, 15, 12, 5, 8, 7, 9, 11, 13, 14, 15, 6, 7, 9, 8,
29 7, 6, 8, 13, 11, 9, 7, 15, 7, 12, 15, 9, 11, 7, 13, 12,
30 11, 13, 6, 7, 14, 9, 13, 15, 14, 8, 13, 6, 5, 12, 7, 5,
31 11, 12, 14, 15, 14, 15, 9, 8, 9, 14, 5, 6, 8, 6, 5, 12,
32 9, 15, 5, 11, 6, 8, 13, 12, 5, 12, 13, 14, 11, 8, 5, 6
33 ]
34
35 # Rotation counts for the right path.
36 RR = [
37 8, 9, 9, 11, 13, 15, 15, 5, 7, 7, 8, 11, 14, 14, 12, 6,
38 9, 13, 15, 7, 12, 8, 9, 11, 7, 7, 12, 7, 6, 15, 13, 11,
39 9, 7, 15, 11, 8, 6, 6, 14, 12, 13, 5, 14, 13, 13, 7, 5,
40 15, 5, 8, 11, 14, 14, 6, 14, 6, 9, 12, 9, 12, 5, 15, 8,
41 8, 5, 12, 9, 12, 5, 14, 6, 8, 13, 6, 5, 15, 13, 11, 11
42 ]
43
44 # K constants for the left path.
45 KL = [0, 0x5a827999, 0x6ed9eba1, 0x8f1bbcdc, 0xa953fd4e]
46
47 # K constants for the right path.
48 KR = [0x50a28be6, 0x5c4dd124, 0x6d703ef3, 0x7a6d76e9, 0]
49
50
51 def fi(x, y, z, i):
52 """The f1, f2, f3, f4, and f5 functions from the specification."""
53 if i == 0:
54 return x ^ y ^ z
55 elif i == 1:
56 return (x & y) | (~x & z)
57 elif i == 2:
58 return (x | ~y) ^ z
59 elif i == 3:
60 return (x & z) | (y & ~z)
61 elif i == 4:
62 return x ^ (y | ~z)
63 else:
64 assert False
65
66
67 def rol(x, i):
68 """Rotate the bottom 32 bits of x left by i bits."""
69 return ((x << i) | ((x & 0xffffffff) >> (32 - i))) & 0xffffffff
70
71
72 def compress(h0, h1, h2, h3, h4, block):
73 """Compress state (h0, h1, h2, h3, h4) with block."""
74 # Left path variables.
75 al, bl, cl, dl, el = h0, h1, h2, h3, h4
76 # Right path variables.
77 ar, br, cr, dr, er = h0, h1, h2, h3, h4
78 # Message variables.
79 x = [int.from_bytes(block[4*i:4*(i+1)], 'little') for i in range(16)]
80
81 # Iterate over the 80 rounds of the compression.
82 for j in range(80):
83 rnd = j >> 4
84 # Perform left side of the transformation.
85 al = rol(al + fi(bl, cl, dl, rnd) + x[ML[j]] + KL[rnd], RL[j]) + el
86 al, bl, cl, dl, el = el, al, bl, rol(cl, 10), dl
87 # Perform right side of the transformation.
88 ar = rol(ar + fi(br, cr, dr, 4 - rnd) + x[MR[j]] + KR[rnd], RR[j]) + er
89 ar, br, cr, dr, er = er, ar, br, rol(cr, 10), dr
90
91 # Compose old state, left transform, and right transform into new state.
92 return h1 + cl + dr, h2 + dl + er, h3 + el + ar, h4 + al + br, h0 + bl + cr
93
94
95 def ripemd160(data):
96 """Compute the RIPEMD-160 hash of data."""
97 # Initialize state.
98 state = (0x67452301, 0xefcdab89, 0x98badcfe, 0x10325476, 0xc3d2e1f0)
99 # Process full 64-byte blocks in the input.
100 for b in range(len(data) >> 6):
101 state = compress(*state, data[64*b:64*(b+1)])
102 # Construct final blocks (with padding and size).
103 pad = b"\x80" + b"\x00" * ((119 - len(data)) & 63)
104 fin = data[len(data) & ~63:] + pad + (8 * len(data)).to_bytes(8, 'little')
105 # Process final blocks.
106 for b in range(len(fin) >> 6):
107 state = compress(*state, fin[64*b:64*(b+1)])
108 # Produce output.
109 return b"".join((h & 0xffffffff).to_bytes(4, 'little') for h in state)
110
111
112 class TestFrameworkKey(unittest.TestCase):
113 def test_ripemd160(self):
114 """RIPEMD-160 test vectors."""
115 # See https://homes.esat.kuleuven.be/~bosselae/ripemd160.html
116 for msg, hexout in [
117 (b"", "9c1185a5c5e9fc54612808977ee8f548b2258d31"),
118 (b"a", "0bdc9d2d256b3ee9daae347be6f4dc835a467ffe"),
119 (b"abc", "8eb208f7e05d987a9b044a8e98c6b087f15a0bfc"),
120 (b"message digest", "5d0689ef49d2fae572b881b123a85ffa21595f36"),
121 (b"abcdefghijklmnopqrstuvwxyz",
122 "f71c27109c692c1b56bbdceb5b9d2865b3708dbc"),
123 (b"abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq",
124 "12a053384a9c0c88e405a06c27dcf49ada62eb2b"),
125 (b"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789",
126 "b0e20b6e3116640286ed3a87a5713079b21f5189"),
127 (b"1234567890" * 8, "9b752e45573d4b39f4dbd3323cab82bf63326bfb"),
128 (b"a" * 1000000, "52783243c1697bdbe16d37f97f68f08325dc1528")
129 ]:
130 self.assertEqual(ripemd160(msg).hex(), hexout)
131