130 lines
4.7 KiB
Python
130 lines
4.7 KiB
Python
# MIT License
|
|
#
|
|
# Copyright (c) 2017 Thomas Dixon
|
|
#
|
|
# 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.
|
|
|
|
import copy
|
|
import struct
|
|
import sys
|
|
|
|
|
|
def new(m=None):
|
|
return sha256(m)
|
|
|
|
class sha256(object):
|
|
_k = (0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5,
|
|
0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,
|
|
0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3,
|
|
0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174,
|
|
0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc,
|
|
0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
|
|
0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7,
|
|
0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967,
|
|
0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13,
|
|
0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
|
|
0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3,
|
|
0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
|
|
0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5,
|
|
0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3,
|
|
0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208,
|
|
0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2)
|
|
_h = (0x6a09e667, 0xbb67ae85, 0x3c6ef372, 0xa54ff53a,
|
|
0x510e527f, 0x9b05688c, 0x1f83d9ab, 0x5be0cd19)
|
|
_output_size = 8
|
|
|
|
blocksize = 1
|
|
block_size = 64
|
|
digest_size = 32
|
|
|
|
def __init__(self, m=None):
|
|
self._buffer = b""
|
|
self._counter = 0
|
|
|
|
if m is not None:
|
|
if type(m) is not bytes:
|
|
raise TypeError('%s() argument 1 must be bytes, not %s' % (self.__class__.__name__, type(m).__name__))
|
|
self.update(m)
|
|
|
|
def _rotr(self, x, y):
|
|
return ((x >> y) | (x << (32-y))) & 0xFFFFFFFF
|
|
|
|
def _sha256_process(self, c):
|
|
w = [0]*64
|
|
w[0:16] = struct.unpack('!16L', c)
|
|
|
|
for i in range(16, 64):
|
|
s0 = self._rotr(w[i-15], 7) ^ self._rotr(w[i-15], 18) ^ (w[i-15] >> 3)
|
|
s1 = self._rotr(w[i-2], 17) ^ self._rotr(w[i-2], 19) ^ (w[i-2] >> 10)
|
|
w[i] = (w[i-16] + s0 + w[i-7] + s1) & 0xFFFFFFFF
|
|
|
|
a,b,c,d,e,f,g,h = self._h
|
|
|
|
for i in range(64):
|
|
s0 = self._rotr(a, 2) ^ self._rotr(a, 13) ^ self._rotr(a, 22)
|
|
maj = (a & b) ^ (a & c) ^ (b & c)
|
|
t2 = s0 + maj
|
|
s1 = self._rotr(e, 6) ^ self._rotr(e, 11) ^ self._rotr(e, 25)
|
|
ch = (e & f) ^ ((~e) & g)
|
|
t1 = h + s1 + ch + self._k[i] + w[i]
|
|
|
|
h = g
|
|
g = f
|
|
f = e
|
|
e = (d + t1) & 0xFFFFFFFF
|
|
d = c
|
|
c = b
|
|
b = a
|
|
a = (t1 + t2) & 0xFFFFFFFF
|
|
|
|
self._h = [(x+y) & 0xFFFFFFFF for x,y in zip(self._h, [a,b,c,d,e,f,g,h])]
|
|
|
|
def update(self, m):
|
|
if not m:
|
|
return
|
|
|
|
if type(m) is not bytes:
|
|
raise TypeError('%s() argument 1 must be bytes, not %s' % (sys._getframe().f_code.co_name, type(m).__name__))
|
|
|
|
self._buffer += m
|
|
self._counter += len(m)
|
|
|
|
while len(self._buffer) >= 64:
|
|
self._sha256_process(self._buffer[:64])
|
|
self._buffer = self._buffer[64:]
|
|
|
|
def digest(self):
|
|
mdi = self._counter & 0x3F
|
|
length = struct.pack('!Q', self._counter<<3)
|
|
|
|
if mdi < 56:
|
|
padlen = 55-mdi
|
|
else:
|
|
padlen = 119-mdi
|
|
|
|
r = self.copy()
|
|
r.update(b'\x80'+(b'\x00'*padlen)+length)
|
|
return b''.join([struct.pack('!L', i) for i in r._h[:self._output_size]])
|
|
|
|
def hexdigest(self):
|
|
return self.digest().encode('hex')
|
|
|
|
def copy(self):
|
|
return copy.deepcopy(self)
|