mirror of
https://github.com/markqvist/Reticulum.git
synced 2024-11-26 15:30:18 +00:00
130 lines
4.6 KiB
Python
130 lines
4.6 KiB
Python
# MIT License
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#
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# Copyright (c) 2017 Thomas Dixon
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#
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# Permission is hereby granted, free of charge, to any person obtaining a copy
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# of this software and associated documentation files (the "Software"), to deal
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# in the Software without restriction, including without limitation the rights
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# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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# copies of the Software, and to permit persons to whom the Software is
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# furnished to do so, subject to the following conditions:
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#
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# The above copyright notice and this permission notice shall be included in all
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# copies or substantial portions of the Software.
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#
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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# SOFTWARE.
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import copy
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import struct
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import sys
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def new(m=None):
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return sha256(m)
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class sha256:
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_k = (0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5,
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0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,
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0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3,
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0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174,
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0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc,
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0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
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0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7,
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0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967,
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0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13,
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0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
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0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3,
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0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
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0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5,
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0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3,
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0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208,
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0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2)
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_h = (0x6a09e667, 0xbb67ae85, 0x3c6ef372, 0xa54ff53a,
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0x510e527f, 0x9b05688c, 0x1f83d9ab, 0x5be0cd19)
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_output_size = 8
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blocksize = 1
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block_size = 64
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digest_size = 32
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def __init__(self, m=None):
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self._buffer = b""
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self._counter = 0
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if m is not None:
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if type(m) is not bytes:
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raise TypeError(f'{self.__class__.__name__}() argument 1 must be bytes, not {type(m).__name__}')
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self.update(m)
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def _rotr(self, x, y):
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return ((x >> y) | (x << (32-y))) & 0xFFFFFFFF
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def _sha256_process(self, c):
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w = [0]*64
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w[0:16] = struct.unpack('!16L', c)
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for i in range(16, 64):
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s0 = self._rotr(w[i-15], 7) ^ self._rotr(w[i-15], 18) ^ (w[i-15] >> 3)
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s1 = self._rotr(w[i-2], 17) ^ self._rotr(w[i-2], 19) ^ (w[i-2] >> 10)
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w[i] = (w[i-16] + s0 + w[i-7] + s1) & 0xFFFFFFFF
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a,b,c,d,e,f,g,h = self._h
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for i in range(64):
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s0 = self._rotr(a, 2) ^ self._rotr(a, 13) ^ self._rotr(a, 22)
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maj = (a & b) ^ (a & c) ^ (b & c)
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t2 = s0 + maj
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s1 = self._rotr(e, 6) ^ self._rotr(e, 11) ^ self._rotr(e, 25)
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ch = (e & f) ^ ((~e) & g)
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t1 = h + s1 + ch + self._k[i] + w[i]
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h = g
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g = f
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f = e
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e = (d + t1) & 0xFFFFFFFF
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d = c
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c = b
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b = a
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a = (t1 + t2) & 0xFFFFFFFF
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self._h = [(x+y) & 0xFFFFFFFF for x,y in zip(self._h, [a,b,c,d,e,f,g,h])]
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def update(self, m):
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if not m:
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return
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if type(m) is not bytes:
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raise TypeError(f'{sys._getframe().f_code.co_name}() argument 1 must be bytes, not {type(m).__name__}')
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self._buffer += m
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self._counter += len(m)
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while len(self._buffer) >= 64:
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self._sha256_process(self._buffer[:64])
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self._buffer = self._buffer[64:]
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def digest(self):
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mdi = self._counter & 0x3F
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length = struct.pack('!Q', self._counter<<3)
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if mdi < 56:
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padlen = 55-mdi
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else:
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padlen = 119-mdi
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r = self.copy()
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r.update(b'\x80'+(b'\x00'*padlen)+length)
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return b''.join([struct.pack('!L', i) for i in r._h[:self._output_size]])
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def hexdigest(self):
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return self.digest().encode('hex')
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def copy(self):
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return copy.deepcopy(self)
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