1  # MIT License
  2  #
  3  # Copyright (c) 2017 Thomas Dixon
  4  #
  5  # Permission is hereby granted, free of charge, to any person obtaining a copy
  6  # of this software and associated documentation files (the "Software"), to deal
  7  # in the Software without restriction, including without limitation the rights
  8  # to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  9  # copies of the Software, and to permit persons to whom the Software is
 10  # furnished to do so, subject to the following conditions:
 11  #
 12  # The above copyright notice and this permission notice shall be included in all
 13  # copies or substantial portions of the Software.
 14  #
 15  # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 16  # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 17  # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 18  # AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 19  # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 20  # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 21  # SOFTWARE.
 22  
 23  import copy, struct, sys
 24  
 25  def new(m=None):
 26      return sha512(m)
 27  
 28  class sha512(object):
 29      _k = (0x428a2f98d728ae22, 0x7137449123ef65cd, 0xb5c0fbcfec4d3b2f, 0xe9b5dba58189dbbc,
 30            0x3956c25bf348b538, 0x59f111f1b605d019, 0x923f82a4af194f9b, 0xab1c5ed5da6d8118,
 31            0xd807aa98a3030242, 0x12835b0145706fbe, 0x243185be4ee4b28c, 0x550c7dc3d5ffb4e2,
 32            0x72be5d74f27b896f, 0x80deb1fe3b1696b1, 0x9bdc06a725c71235, 0xc19bf174cf692694,
 33            0xe49b69c19ef14ad2, 0xefbe4786384f25e3, 0x0fc19dc68b8cd5b5, 0x240ca1cc77ac9c65,
 34            0x2de92c6f592b0275, 0x4a7484aa6ea6e483, 0x5cb0a9dcbd41fbd4, 0x76f988da831153b5,
 35            0x983e5152ee66dfab, 0xa831c66d2db43210, 0xb00327c898fb213f, 0xbf597fc7beef0ee4,
 36            0xc6e00bf33da88fc2, 0xd5a79147930aa725, 0x06ca6351e003826f, 0x142929670a0e6e70,
 37            0x27b70a8546d22ffc, 0x2e1b21385c26c926, 0x4d2c6dfc5ac42aed, 0x53380d139d95b3df,
 38            0x650a73548baf63de, 0x766a0abb3c77b2a8, 0x81c2c92e47edaee6, 0x92722c851482353b,
 39            0xa2bfe8a14cf10364, 0xa81a664bbc423001, 0xc24b8b70d0f89791, 0xc76c51a30654be30,
 40            0xd192e819d6ef5218, 0xd69906245565a910, 0xf40e35855771202a, 0x106aa07032bbd1b8,
 41            0x19a4c116b8d2d0c8, 0x1e376c085141ab53, 0x2748774cdf8eeb99, 0x34b0bcb5e19b48a8,
 42            0x391c0cb3c5c95a63, 0x4ed8aa4ae3418acb, 0x5b9cca4f7763e373, 0x682e6ff3d6b2b8a3,
 43            0x748f82ee5defb2fc, 0x78a5636f43172f60, 0x84c87814a1f0ab72, 0x8cc702081a6439ec,
 44            0x90befffa23631e28, 0xa4506cebde82bde9, 0xbef9a3f7b2c67915, 0xc67178f2e372532b,
 45            0xca273eceea26619c, 0xd186b8c721c0c207, 0xeada7dd6cde0eb1e, 0xf57d4f7fee6ed178,
 46            0x06f067aa72176fba, 0x0a637dc5a2c898a6, 0x113f9804bef90dae, 0x1b710b35131c471b,
 47            0x28db77f523047d84, 0x32caab7b40c72493, 0x3c9ebe0a15c9bebc, 0x431d67c49c100d4c,
 48            0x4cc5d4becb3e42b6, 0x597f299cfc657e2a, 0x5fcb6fab3ad6faec, 0x6c44198c4a475817)
 49      _h = (0x6a09e667f3bcc908, 0xbb67ae8584caa73b, 0x3c6ef372fe94f82b, 0xa54ff53a5f1d36f1,
 50            0x510e527fade682d1, 0x9b05688c2b3e6c1f, 0x1f83d9abfb41bd6b, 0x5be0cd19137e2179)
 51      _output_size = 8
 52  
 53      blocksize = 1
 54      block_size = 128
 55      digest_size = 64
 56  
 57      def __init__(self, m=None):
 58          self._buffer = b''
 59          self._counter = 0
 60  
 61          if m is not None:
 62              if type(m) is not bytes:
 63                  raise TypeError('%s() argument 1 must be bytes, not %s' % (self.__class__.__name__, type(m).__name__))
 64              self.update(m)
 65  
 66      def _rotr(self, x, y):
 67          return ((x >> y) | (x << (64-y))) & 0xFFFFFFFFFFFFFFFF
 68  
 69      def _sha512_process(self, chunk):
 70          w = [0]*80
 71          w[0:16] = struct.unpack('!16Q', chunk)
 72  
 73          for i in range(16, 80):
 74              s0 = self._rotr(w[i-15], 1) ^ self._rotr(w[i-15], 8) ^ (w[i-15] >> 7)
 75              s1 = self._rotr(w[i-2], 19) ^ self._rotr(w[i-2], 61) ^ (w[i-2] >> 6)
 76              w[i] = (w[i-16] + s0 + w[i-7] + s1) & 0xFFFFFFFFFFFFFFFF
 77  
 78          a,b,c,d,e,f,g,h = self._h
 79  
 80          for i in range(80):
 81              s0 = self._rotr(a, 28) ^ self._rotr(a, 34) ^ self._rotr(a, 39)
 82              maj = (a & b) ^ (a & c) ^ (b & c)
 83              t2 = s0 + maj
 84              s1 = self._rotr(e, 14) ^ self._rotr(e, 18) ^ self._rotr(e, 41)
 85              ch = (e & f) ^ ((~e) & g)
 86              t1 = h + s1 + ch + self._k[i] + w[i]
 87  
 88              h = g
 89              g = f
 90              f = e
 91              e = (d + t1) & 0xFFFFFFFFFFFFFFFF
 92              d = c
 93              c = b
 94              b = a
 95              a = (t1 + t2) & 0xFFFFFFFFFFFFFFFF
 96  
 97          self._h = [(x+y) & 0xFFFFFFFFFFFFFFFF for x,y in zip(self._h, [a,b,c,d,e,f,g,h])]
 98  
 99      def update(self, m):
100          if not m:
101              return
102          if type(m) is not bytes:
103              raise TypeError('%s() argument 1 must be bytes, not %s' % (sys._getframe().f_code.co_name, type(m).__name__))
104  
105          self._buffer += m
106          self._counter += len(m)
107  
108          while len(self._buffer) >= 128:
109              self._sha512_process(self._buffer[:128])
110              self._buffer = self._buffer[128:]
111  
112      def digest(self):
113          mdi = self._counter & 0x7F
114          length = struct.pack('!Q', self._counter<<3)
115  
116          if mdi < 112:
117              padlen = 111-mdi
118          else:
119              padlen = 239-mdi
120  
121          r = self.copy()
122          r.update(b'\x80'+(b'\x00'*(padlen+8))+length)
123          return b''.join([struct.pack('!Q', i) for i in r._h[:self._output_size]])
124  
125      def hexdigest(self):
126          return self.digest().encode('hex')
127  
128      def copy(self):
129          return copy.deepcopy(self)