-
Notifications
You must be signed in to change notification settings - Fork 12
/
ripemd128.py
130 lines (107 loc) · 3.45 KB
/
ripemd128.py
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
"""
Copyright by https://github.com/zhansliu/writemdict
ripemd128.py - A simple ripemd128 library in pure Python.
Supports both Python 2 (versions >= 2.6) and Python 3.
Usage:
from ripemd128 import ripemd128
digest = ripemd128(b"The quick brown fox jumps over the lazy dog")
assert(digest == b"\x3f\xa9\xb5\x7f\x05\x3c\x05\x3f\xbe\x27\x35\xb2\x38\x0d\xb5\x96")
"""
import struct
# follows this description: http://homes.esat.kuleuven.be/~bosselae/ripemd/rmd128.txt
def f(j, x, y, z):
assert(0 <= j and j < 64)
if j < 16:
return x ^ y ^ z
elif j < 32:
return (x & y) | (z & ~x)
elif j < 48:
return (x | (0xffffffff & ~y)) ^ z
else:
return (x & z) | (y & ~z)
def K(j):
assert(0 <= j and j < 64)
if j < 16:
return 0x00000000
elif j < 32:
return 0x5a827999
elif j < 48:
return 0x6ed9eba1
else:
return 0x8f1bbcdc
def Kp(j):
assert(0 <= j and j < 64)
if j < 16:
return 0x50a28be6
elif j < 32:
return 0x5c4dd124
elif j < 48:
return 0x6d703ef3
else:
return 0x00000000
def padandsplit(message):
"""
returns a two-dimensional array X[i][j] of 32-bit integers, where j ranges
from 0 to 16.
First pads the message to length in bytes is congruent to 56 (mod 64),
by first adding a byte 0x80, and then padding with 0x00 bytes until the
message length is congruent to 56 (mod 64). Then adds the little-endian
64-bit representation of the original length. Finally, splits the result
up into 64-byte blocks, which are further parsed as 32-bit integers.
"""
origlen = len(message)
padlength = 64 - ((origlen - 56) % 64) #minimum padding is 1!
message += b"\x80"
message += b"\x00" * (padlength - 1)
message += struct.pack("<Q", origlen*8)
assert(len(message) % 64 == 0)
return [
[
struct.unpack("<L", message[i+j:i+j+4])[0]
for j in range(0, 64, 4)
]
for i in range(0, len(message), 64)
]
def add(*args):
return sum(args) & 0xffffffff
def rol(s,x):
assert(s < 32)
return (x << s | x >> (32-s)) & 0xffffffff
r = [ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,10,11,12,13,14,15,
7, 4,13, 1,10, 6,15, 3,12, 0, 9, 5, 2,14,11, 8,
3,10,14, 4, 9,15, 8, 1, 2, 7, 0, 6,13,11, 5,12,
1, 9,11,10, 0, 8,12, 4,13, 3, 7,15,14, 5, 6, 2]
rp = [ 5,14, 7, 0, 9, 2,11, 4,13, 6,15, 8, 1,10, 3,12,
6,11, 3, 7, 0,13, 5,10,14,15, 8,12, 4, 9, 1, 2,
15, 5, 1, 3, 7,14, 6, 9,11, 8,12, 2,10, 0, 4,13,
8, 6, 4, 1, 3,11,15, 0, 5,12, 2,13, 9, 7,10,14]
s = [11,14,15,12, 5, 8, 7, 9,11,13,14,15, 6, 7, 9, 8,
7, 6, 8,13,11, 9, 7,15, 7,12,15, 9,11, 7,13,12,
11,13, 6, 7,14, 9,13,15,14, 8,13, 6, 5,12, 7, 5,
11,12,14,15,14,15, 9, 8, 9,14, 5, 6, 8, 6, 5,12]
sp = [ 8, 9, 9,11,13,15,15, 5, 7, 7, 8,11,14,14,12, 6,
9,13,15, 7,12, 8, 9,11, 7, 7,12, 7, 6,15,13,11,
9, 7,15,11, 8, 6, 6,14,12,13, 5,14,13,13, 7, 5,
15, 5, 8,11,14,14, 6,14, 6, 9,12, 9,12, 5,15, 8]
def ripemd128(message):
h0 = 0x67452301
h1 = 0xefcdab89
h2 = 0x98badcfe
h3 = 0x10325476
X = padandsplit(message)
for i in range(len(X)):
(A,B,C,D) = (h0,h1,h2,h3)
(Ap,Bp,Cp,Dp) = (h0,h1,h2,h3)
for j in range(64):
T = rol(s[j], add(A, f(j,B,C,D), X[i][r[j]], K(j)))
(A,D,C,B) = (D,C,B,T)
T = rol(sp[j], add(Ap, f(63-j,Bp,Cp,Dp), X[i][rp[j]], Kp(j)))
(Ap,Dp,Cp,Bp)=(Dp,Cp,Bp,T)
T = add(h1,C,Dp)
h1 = add(h2,D,Ap)
h2 = add(h3,A,Bp)
h3 = add(h0,B,Cp)
h0 = T
return struct.pack("<LLLL",h0,h1,h2,h3)
def hexstr(bstr):
return "".join("{0:02x}".format(b) for b in bstr)