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Commit | Line | Data |
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566d8c23 CP |
1 | #!/usr/bin/python |
2 | __author__ = 'Thomas Dixon' | |
3 | __license__ = 'MIT' | |
4 | ||
5 | import copy, struct, sys | |
6 | ||
7 | def new(m=None): | |
8 | return sha256(m) | |
9 | ||
10 | class sha256(object): | |
11 | _k = (0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, | |
12 | 0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5, | |
13 | 0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3, | |
14 | 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174, | |
15 | 0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc, | |
16 | 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da, | |
17 | 0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7, | |
18 | 0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967, | |
19 | 0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13, | |
20 | 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85, | |
21 | 0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3, | |
22 | 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070, | |
23 | 0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5, | |
24 | 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3, | |
25 | 0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208, | |
26 | 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2) | |
27 | _h = (0x6a09e667, 0xbb67ae85, 0x3c6ef372, 0xa54ff53a, | |
28 | 0x510e527f, 0x9b05688c, 0x1f83d9ab, 0x5be0cd19) | |
29 | _output_size = 8 | |
30 | ||
31 | blocksize = 1 | |
32 | digest_size = 32 | |
33 | ||
34 | def __init__(self, m=None): | |
35 | self._buffer = '' | |
36 | self._counter = 0 | |
37 | ||
38 | if m is not None: | |
39 | if type(m) is not str: | |
40 | raise TypeError, '%s() argument 1 must be string, not %s' % (self.__class__.__name__, type(m).__name__) | |
41 | self.update(m) | |
42 | ||
43 | def _rotr(self, x, y): | |
44 | return ((x >> y) | (x << (32-y))) & 0xFFFFFFFF | |
45 | ||
46 | def _sha256_process(self, c): | |
47 | w = [0]*64 | |
48 | w[0:15] = struct.unpack('!16L', c) | |
49 | ||
50 | for i in range(16, 64): | |
51 | s0 = self._rotr(w[i-15], 7) ^ self._rotr(w[i-15], 18) ^ (w[i-15] >> 3) | |
52 | s1 = self._rotr(w[i-2], 17) ^ self._rotr(w[i-2], 19) ^ (w[i-2] >> 10) | |
53 | w[i] = (w[i-16] + s0 + w[i-7] + s1) & 0xFFFFFFFF | |
54 | ||
55 | a,b,c,d,e,f,g,h = self._h | |
56 | ||
57 | for i in range(64): | |
58 | s0 = self._rotr(a, 2) ^ self._rotr(a, 13) ^ self._rotr(a, 22) | |
59 | maj = (a & b) ^ (a & c) ^ (b & c) | |
60 | t2 = s0 + maj | |
61 | s1 = self._rotr(e, 6) ^ self._rotr(e, 11) ^ self._rotr(e, 25) | |
62 | ch = (e & f) ^ ((~e) & g) | |
63 | t1 = h + s1 + ch + self._k[i] + w[i] | |
64 | ||
65 | h = g | |
66 | g = f | |
67 | f = e | |
68 | e = (d + t1) & 0xFFFFFFFF | |
69 | d = c | |
70 | c = b | |
71 | b = a | |
72 | a = (t1 + t2) & 0xFFFFFFFF | |
73 | ||
74 | self._h = [(x+y) & 0xFFFFFFFF for x,y in zip(self._h, [a,b,c,d,e,f,g,h])] | |
75 | ||
76 | def update(self, m): | |
77 | if not m: | |
78 | return | |
79 | if type(m) is not str: | |
80 | raise TypeError, '%s() argument 1 must be string, not %s' % (sys._getframe().f_code.co_name, type(m).__name__) | |
81 | ||
82 | self._buffer += m | |
83 | self._counter += len(m) | |
84 | ||
85 | while len(self._buffer) >= 64: | |
86 | self._sha256_process(self._buffer[:64]) | |
87 | self._buffer = self._buffer[64:] | |
88 | ||
89 | def digest(self): | |
90 | mdi = self._counter & 0x3F | |
91 | length = struct.pack('!Q', self._counter<<3) | |
92 | ||
93 | if mdi < 56: | |
94 | padlen = 55-mdi | |
95 | else: | |
96 | padlen = 119-mdi | |
97 | ||
98 | r = self.copy() | |
99 | r.update('\x80'+('\x00'*padlen)+length) | |
100 | return ''.join([struct.pack('!L', i) for i in r._h[:self._output_size]]) | |
101 | ||
102 | def hexdigest(self): | |
103 | return self.digest().encode('hex') | |
104 | ||
105 | def copy(self): | |
106 | return copy.deepcopy(self) | |
107 | ||
108 | digest_size = new().digest_size |