#!/usr/bin/env python3 # -*- coding: utf-8 -*- #======================================================================= # # sha512.py # --------- # Simple, pure Python model of the SHA-512 hash function. Used as a # reference for the HW implementation. The code follows the structure # of the HW implementation as much as possible. # # # Author: Joachim Strömbergson # Copyright (c) 2014, SUNET # All rights reserved. # # Redistribution and use in source and binary forms, with or # without modification, are permitted provided that the following # conditions are met: # # 1. Redistributions of source code must retain the above copyright # notice, this list of conditions and the following disclaimer. # # 2. Redistributions in binary form must reproduce the above copyright # notice, this list of conditions and the following disclaimer in # the documentation and/or other materials provided with the # distribution. # # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS # "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT # LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS # FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE # COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, # INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, # BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; # LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER # CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, # STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) # ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF # ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. # #======================================================================= #------------------------------------------------------------------- # Python module imports. #------------------------------------------------------------------- import sys #------------------------------------------------------------------- # Constants. #------------------------------------------------------------------- MAX_64BIT = 0xffffffffffffffff #------------------------------------------------------------------- # ChaCha() #------------------------------------------------------------------- class SHA512(): def __init__(self, mode = 'MODE_SHA_512', verbose = 0): assert mode in ['MODE_SHA_512_224', 'MODE_SHA_512_256', 'MODE_SHA_384', 'MODE_SHA_512'] self.mode = mode self.verbose = verbose self.mode self.NUM_ROUNDS = 80 self.H = [0] * 8 self.t1 = 0 self.t2 = 0 self.a = 0 self.b = 0 self.c = 0 self.d = 0 self.e = 0 self.f = 0 self.g = 0 self.h = 0 self.w = 0 self.W = [0] * 16 self.k = 0 self.K = [0x428a2f98d728ae22, 0x7137449123ef65cd, 0xb5c0fbcfec4d3b2f, 0xe9b5dba58189dbbc, 0x3956c25bf348b538, 0x59f111f1b605d019, 0x923f82a4af194f9b, 0xab1c5ed5da6d8118, 0xd807aa98a3030242, 0x12835b0145706fbe, 0x243185be4ee4b28c, 0x550c7dc3d5ffb4e2, 0x72be5d74f27b896f, 0x80deb1fe3b1696b1, 0x9bdc06a725c71235, 0xc19bf174cf692694, 0xe49b69c19ef14ad2, 0xefbe4786384f25e3, 0x0fc19dc68b8cd5b5, 0x240ca1cc77ac9c65, 0x2de92c6f592b0275, 0x4a7484aa6ea6e483, 0x5cb0a9dcbd41fbd4, 0x76f988da831153b5, 0x983e5152ee66dfab, 0xa831c66d2db43210, 0xb00327c898fb213f, 0xbf597fc7beef0ee4, 0xc6e00bf33da88fc2, 0xd5a79147930aa725, 0x06ca6351e003826f, 0x142929670a0e6e70, 0x27b70a8546d22ffc, 0x2e1b21385c26c926, 0x4d2c6dfc5ac42aed, 0x53380d139d95b3df, 0x650a73548baf63de, 0x766a0abb3c77b2a8, 0x81c2c92e47edaee6, 0x92722c851482353b, 0xa2bfe8a14cf10364, 0xa81a664bbc423001, 0xc24b8b70d0f89791, 0xc76c51a30654be30, 0xd192e819d6ef5218, 0xd69906245565a910, 0xf40e35855771202a, 0x106aa07032bbd1b8, 0x19a4c116b8d2d0c8, 0x1e376c085141ab53, 0x2748774cdf8eeb99, 0x34b0bcb5e19b48a8, 0x391c0cb3c5c95a63, 0x4ed8aa4ae3418acb, 0x5b9cca4f7763e373, 0x682e6ff3d6b2b8a3, 0x748f82ee5defb2fc, 0x78a5636f43172f60, 0x84c87814a1f0ab72, 0x8cc702081a6439ec, 0x90befffa23631e28, 0xa4506cebde82bde9, 0xbef9a3f7b2c67915, 0xc67178f2e372532b, 0xca273eceea26619c, 0xd186b8c721c0c207, 0xeada7dd6cde0eb1e, 0xf57d4f7fee6ed178, 0x06f067aa72176fba, 0x0a637dc5a2c898a6, 0x113f9804bef90dae, 0x1b710b35131c471b, 0x28db77f523047d84, 0x32caab7b40c72493, 0x3c9ebe0a15c9bebc, 0x431d67c49c100d4c, 0x4cc5d4becb3e42b6, 0x597f299cfc657e2a, 0x5fcb6fab3ad6faec, 0x6c44198c4a475817] def init(self): if self.mode == 'MODE_SHA_512_224': self.H = [0x8c3d37c819544da2, 0x73e1996689dcd4d6, 0x1dfab7ae32ff9c82, 0x679dd514582f9fcf, 0x0f6d2b697bd44da8, 0x77e36f7304c48942, 0x3f9d85a86a1d36c8, 0x1112e6ad91d692a1] elif self.mode == 'MODE_SHA_512_256': self.H = [0x22312194fc2bf72c, 0x9f555fa3c84c64c2, 0x2393b86b6f53b151, 0x963877195940eabd, 0x96283ee2a88effe3, 0xbe5e1e2553863992, 0x2b0199fc2c85b8aa, 0x0eb72ddc81c52ca2] elif self.mode == 'MODE_SHA_384': self.H = [0xcbbb9d5dc1059ed8, 0x629a292a367cd507, 0x9159015a3070dd17, 0x152fecd8f70e5939, 0x67332667ffc00b31, 0x8eb44a8768581511, 0xdb0c2e0d64f98fa7, 0x47b5481dbefa4fa4] elif self.mode == 'MODE_SHA_512': self.H = [0x6a09e667f3bcc908, 0xbb67ae8584caa73b, 0x3c6ef372fe94f82b, 0xa54ff53a5f1d36f1, 0x510e527fade682d1, 0x9b05688c2b3e6c1f, 0x1f83d9abfb41bd6b, 0x5be0cd19137e2179] def next(self, block): self._W_schedule(block) self._copy_digest() if self.verbose: print("State after init:") self._print_state(0) for i in range(self.NUM_ROUNDS): self._sha512_round(i) if self.verbose: self._print_state(i) self._update_digest() def get_digest(self): if self.mode == 'MODE_SHA_512_224': return self.H[0:3] # FIX THIS! elif self.mode == 'MODE_SHA_512_256': return self.H[0:4] elif self.mode == 'MODE_SHA_384': return self.H[0:6] elif self.mode == 'MODE_SHA_512': return self.H def _copy_digest(self): self.a = self.H[0] self.b = self.H[1] self.c = self.H[2] self.d = self.H[3] self.e = self.H[4] self.f = self.H[5] self.g = self.H[6] self.h = self.H[7] def _update_digest(self): self.H[0] = (self.H[0] + self.a) & MAX_64BIT self.H[1] = (self.H[1] + self.b) & MAX_64BIT self.H[2] = (self.H[2] + self.c) & MAX_64BIT self.H[3] = (self.H[3] + self.d) & MAX_64BIT self.H[4] = (self.H[4] + self.e) & MAX_64BIT self.H[5] = (self.H[5] + self.f) & MAX_64BIT self.H[6] = (self.H[6] + self.g) & MAX_64BIT self.H[7] = (self.H[7] + self.h) & MAX_64BIT def _print_state(self, round): print("State at round 0x%02x:" % round) print("t1 = 0x%016x, t2 = 0x%016x" % (self.t1, self.t2)) print("k = 0x%016x, w = 0x%016x" % (self.k, self.w)) print("a = 0x%016x, b = 0x%016x" % (self.a, self.b)) print("c = 0x%016x, d = 0x%016x" % (self.c, self.d)) print("e = 0x%016x, f = 0x%016x" % (self.e, self.f)) print("g = 0x%016x, h = 0x%016x" % (self.g, self.h)) print("") def _sha512_round(self, round): self.k = self.K[round] self.w = self._next_w(round) self.t1 = self._T1(self.e, self.f, self.g, self.h, self.k, self.w) self.t2 = self._T2(self.a, self.b, self.c) self.h = self.g self.g = self.f self.f = self.e self.e = (self.d + self.t1) & MAX_64BIT self.d = self.c self.c = self.b self.b = self.a self.a = (self.t1 + self.t2) & MAX_64BIT def _next_w(self, round): if (round < 16): return self.W[round] else: tmp_w = (self._delta1(self.W[14]) + self.W[9] + self._delta0(self.W[1]) + self.W[0]) & MAX_64BIT for i in range(15): self.W[i] = self.W[(i+1)] self.W[15] = tmp_w return tmp_w def _W_schedule(self, block): for i in range(16): self.W[i] = block[i] def _Ch(self, x, y, z): return (x & y) ^ (~x & z) def _Maj(self, x, y, z): return (x & y) ^ (x & z) ^ (y & z) def _sigma0(self, x): return (self._rotr64(x, 28) ^ self._rotr64(x, 34) ^ self._rotr64(x, 39)) def _sigma1(self, x): return (self._rotr64(x, 14) ^ self._rotr64(x, 18) ^ self._rotr64(x, 41)) def _delta0(self, x): return (self._rotr64(x, 1) ^ self._rotr64(x, 8) ^ self._shr64(x, 7)) def _delta1(self, x): return (self._rotr64(x, 19) ^ self._rotr64(x, 61) ^ self._shr64(x, 6)) def _T1(self, e, f, g, h, k, w): return (h + self._sigma1(e) + self._Ch(e, f, g) + k + w) & MAX_64BIT def _T2(self, a, b, c): return (self._sigma0(a) + self._Maj(a, b, c)) & MAX_64BIT def _rotr64(self, n, r): return ((n >> r) | (n << (64 - r))) & MAX_64BIT def _shr64(self, n, r): return (n >> r) def compare_digests(digest, expected): if (digest != expected): print("Error:") print("Got:") print(digest) print("Expected:") print(expected) else: print("Test case ok.") #------------------------------------------------------------------- # main() # # If executed tests the ChaCha class using known test vectors. #------------------------------------------------------------------- def main(): print("Testing the SHA-512 Python model.") print("---------------------------------") print # Single block message. TC1_block = [0x6162638000000000, 0x0000000000000000, 0x0000000000000000, 0x0000000000000000, 0x0000000000000000, 0x0000000000000000, 0x0000000000000000, 0x0000000000000000, 0x0000000000000000, 0x0000000000000000, 0x0000000000000000, 0x0000000000000000, 0x0000000000000000, 0x0000000000000000, 0x0000000000000000, 0x0000000000000018] my_sha512 = SHA512(mode = 'MODE_SHA_512', verbose=1); TC1_expected = [0xDDAF35A193617ABA, 0xCC417349AE204131, 0x12E6FA4E89A97EA2, 0x0A9EEEE64B55D39A, 0x2192992A274FC1A8, 0x36BA3C23A3FEEBBD, 0x454D4423643CE80E, 0x2A9AC94FA54CA49F] my_sha512.init() my_sha512.next(TC1_block) my_digest = my_sha512.get_digest() compare_digests(my_digest, TC1_expected) my_sha512 = SHA512(mode = 'MODE_SHA_512_224', verbose=1); TC2_expected = [0x4634270F707B6A54, 0xDAAE7530460842E2, 0x0E37ED265CEEE9A4, 0x3E8924AA00000000] my_sha512.init() my_sha512.next(TC1_block) my_digest = my_sha512.get_digest() compare_digests(my_digest, TC2_expected) my_sha512 = SHA512(mode = 'MODE_SHA_512_256', verbose=1); TC3_expected = [0x53048E2681941EF9, 0x9B2E29B76B4C7DAB, 0xE4C2D0C634FC6D46, 0xE0E2F13107E7AF23] my_sha512.init() my_sha512.next(TC1_block) my_digest = my_sha512.get_digest() compare_digests(my_digest, TC3_expected) my_sha512 = SHA512(mode = 'MODE_SHA_384', verbose=1); TC4_expected = [0xCB00753F45A35E8B, 0xB5A03D699AC65007, 0x272C32AB0EDED163, 0x1A8B605A43FF5BED, 0x8086072BA1E7CC23, 0x58BAECA134C825A7] my_sha512.init() my_sha512.next(TC1_block) my_digest = my_sha512.get_digest() compare_digests(my_digest, TC4_expected) #------------------------------------------------------------------- # __name__ # Python thingy which allows the file to be run standalone as # well as parsed from within a Python interpreter. #------------------------------------------------------------------- if __name__=="__main__": # Run the main function. sys.exit(main()) #======================================================================= # EOF sha512.py #=======================================================================