X-Git-Url: http://www.git.cypherpunks.ru/?a=blobdiff_plain;f=pygost%2Fgost34112012.py;fp=pygost%2Fgost34112012.py;h=7ba2b5d7619b7931fb7283cfd03a5cbef9deb2fc;hb=c8f1dd2e8e0c1fe29d13b7f34dcb480079190ec0;hp=0000000000000000000000000000000000000000;hpb=8eb72a8619e56aa13a16a94f71fcc113d5a9ce3c;p=pygost.git diff --git a/pygost/gost34112012.py b/pygost/gost34112012.py new file mode 100644 index 0000000..7ba2b5d --- /dev/null +++ b/pygost/gost34112012.py @@ -0,0 +1,276 @@ +# coding: utf-8 +# PyGOST -- Pure Python GOST cryptographic functions library +# Copyright (C) 2015-2016 Sergey Matveev +# +# This program is free software: you can redistribute it and/or modify +# it under the terms of the GNU General Public License as published by +# the Free Software Foundation, either version 3 of the License, or +# (at your option) any later version. +# +# This program is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +# GNU General Public License for more details. +# +# You should have received a copy of the GNU General Public License +# along with this program. If not, see . +""" GOST R 34.11-2012 (Streebog) hash function common files + +This is implementation of :rfc:`6986`. Most function and variable names are +taken according to specification's terminology. +""" + +from copy import copy +from struct import pack +from struct import unpack + +from pygost.iface import PEP247 +from pygost.utils import hexdec +from pygost.utils import hexenc +from pygost.utils import strxor +from pygost.utils import xrange + + +BLOCKSIZE = 64 +Pi = bytearray(( + 252, 238, 221, 17, 207, 110, 49, 22, 251, 196, 250, + 218, 35, 197, 4, 77, 233, 119, 240, 219, 147, 46, + 153, 186, 23, 54, 241, 187, 20, 205, 95, 193, 249, + 24, 101, 90, 226, 92, 239, 33, 129, 28, 60, 66, + 139, 1, 142, 79, 5, 132, 2, 174, 227, 106, 143, + 160, 6, 11, 237, 152, 127, 212, 211, 31, 235, 52, + 44, 81, 234, 200, 72, 171, 242, 42, 104, 162, 253, + 58, 206, 204, 181, 112, 14, 86, 8, 12, 118, 18, + 191, 114, 19, 71, 156, 183, 93, 135, 21, 161, 150, + 41, 16, 123, 154, 199, 243, 145, 120, 111, 157, 158, + 178, 177, 50, 117, 25, 61, 255, 53, 138, 126, 109, + 84, 198, 128, 195, 189, 13, 87, 223, 245, 36, 169, + 62, 168, 67, 201, 215, 121, 214, 246, 124, 34, 185, + 3, 224, 15, 236, 222, 122, 148, 176, 188, 220, 232, + 40, 80, 78, 51, 10, 74, 167, 151, 96, 115, 30, + 0, 98, 68, 26, 184, 56, 130, 100, 159, 38, 65, + 173, 69, 70, 146, 39, 94, 85, 47, 140, 163, 165, + 125, 105, 213, 149, 59, 7, 88, 179, 64, 134, 172, + 29, 247, 48, 55, 107, 228, 136, 217, 231, 137, 225, + 27, 131, 73, 76, 63, 248, 254, 141, 83, 170, 144, + 202, 216, 133, 97, 32, 113, 103, 164, 45, 43, 9, + 91, 203, 155, 37, 208, 190, 229, 108, 82, 89, 166, + 116, 210, 230, 244, 180, 192, 209, 102, 175, 194, 57, + 75, 99, 182, +)) + +A = [unpack(">Q", hexdec(s))[0] for s in ( + "8e20faa72ba0b470", "47107ddd9b505a38", "ad08b0e0c3282d1c", "d8045870ef14980e", + "6c022c38f90a4c07", "3601161cf205268d", "1b8e0b0e798c13c8", "83478b07b2468764", + "a011d380818e8f40", "5086e740ce47c920", "2843fd2067adea10", "14aff010bdd87508", + "0ad97808d06cb404", "05e23c0468365a02", "8c711e02341b2d01", "46b60f011a83988e", + "90dab52a387ae76f", "486dd4151c3dfdb9", "24b86a840e90f0d2", "125c354207487869", + "092e94218d243cba", "8a174a9ec8121e5d", "4585254f64090fa0", "accc9ca9328a8950", + "9d4df05d5f661451", "c0a878a0a1330aa6", "60543c50de970553", "302a1e286fc58ca7", + "18150f14b9ec46dd", "0c84890ad27623e0", "0642ca05693b9f70", "0321658cba93c138", + "86275df09ce8aaa8", "439da0784e745554", "afc0503c273aa42a", "d960281e9d1d5215", + "e230140fc0802984", "71180a8960409a42", "b60c05ca30204d21", "5b068c651810a89e", + "456c34887a3805b9", "ac361a443d1c8cd2", "561b0d22900e4669", "2b838811480723ba", + "9bcf4486248d9f5d", "c3e9224312c8c1a0", "effa11af0964ee50", "f97d86d98a327728", + "e4fa2054a80b329c", "727d102a548b194e", "39b008152acb8227", "9258048415eb419d", + "492c024284fbaec0", "aa16012142f35760", "550b8e9e21f7a530", "a48b474f9ef5dc18", + "70a6a56e2440598e", "3853dc371220a247", "1ca76e95091051ad", "0edd37c48a08a6d8", + "07e095624504536c", "8d70c431ac02a736", "c83862965601dd1b", "641c314b2b8ee083", +)] + +Tau = ( + 0, 8, 16, 24, 32, 40, 48, 56, + 1, 9, 17, 25, 33, 41, 49, 57, + 2, 10, 18, 26, 34, 42, 50, 58, + 3, 11, 19, 27, 35, 43, 51, 59, + 4, 12, 20, 28, 36, 44, 52, 60, + 5, 13, 21, 29, 37, 45, 53, 61, + 6, 14, 22, 30, 38, 46, 54, 62, + 7, 15, 23, 31, 39, 47, 55, 63, +) + +C = [hexdec("".join(s))[::-1] for s in ( + ( + "b1085bda1ecadae9ebcb2f81c0657c1f", + "2f6a76432e45d016714eb88d7585c4fc", + "4b7ce09192676901a2422a08a460d315", + "05767436cc744d23dd806559f2a64507", + ), + ( + "6fa3b58aa99d2f1a4fe39d460f70b5d7", + "f3feea720a232b9861d55e0f16b50131", + "9ab5176b12d699585cb561c2db0aa7ca", + "55dda21bd7cbcd56e679047021b19bb7", + ), + ( + "f574dcac2bce2fc70a39fc286a3d8435", + "06f15e5f529c1f8bf2ea7514b1297b7b", + "d3e20fe490359eb1c1c93a376062db09", + "c2b6f443867adb31991e96f50aba0ab2", + ), + ( + "ef1fdfb3e81566d2f948e1a05d71e4dd", + "488e857e335c3c7d9d721cad685e353f", + "a9d72c82ed03d675d8b71333935203be", + "3453eaa193e837f1220cbebc84e3d12e", + ), + ( + "4bea6bacad4747999a3f410c6ca92363", + "7f151c1f1686104a359e35d7800fffbd", + "bfcd1747253af5a3dfff00b723271a16", + "7a56a27ea9ea63f5601758fd7c6cfe57", + ), + ( + "ae4faeae1d3ad3d96fa4c33b7a3039c0", + "2d66c4f95142a46c187f9ab49af08ec6", + "cffaa6b71c9ab7b40af21f66c2bec6b6", + "bf71c57236904f35fa68407a46647d6e", + ), + ( + "f4c70e16eeaac5ec51ac86febf240954", + "399ec6c7e6bf87c9d3473e33197a93c9", + "0992abc52d822c3706476983284a0504", + "3517454ca23c4af38886564d3a14d493", + ), + ( + "9b1f5b424d93c9a703e7aa020c6e4141", + "4eb7f8719c36de1e89b4443b4ddbc49a", + "f4892bcb929b069069d18d2bd1a5c42f", + "36acc2355951a8d9a47f0dd4bf02e71e", + ), + ( + "378f5a541631229b944c9ad8ec165fde", + "3a7d3a1b258942243cd955b7e00d0984", + "800a440bdbb2ceb17b2b8a9aa6079c54", + "0e38dc92cb1f2a607261445183235adb", + ), + ( + "abbedea680056f52382ae548b2e4f3f3", + "8941e71cff8a78db1fffe18a1b336103", + "9fe76702af69334b7a1e6c303b7652f4", + "3698fad1153bb6c374b4c7fb98459ced", + ), + ( + "7bcd9ed0efc889fb3002c6cd635afe94", + "d8fa6bbbebab07612001802114846679", + "8a1d71efea48b9caefbacd1d7d476e98", + "dea2594ac06fd85d6bcaa4cd81f32d1b", + ), + ( + "378ee767f11631bad21380b00449b17a", + "cda43c32bcdf1d77f82012d430219f9b", + "5d80ef9d1891cc86e71da4aa88e12852", + "faf417d5d9b21b9948bc924af11bd720", + ), +)] + + +def add512bit(a, b): + """ Add two 512 integers + """ + a = bytearray(a) + b = bytearray(b) + cb = 0 + res = bytearray(64) + for i in range(64): + cb = a[i] + b[i] + (cb >> 8) + res[i] = cb & 0xff + return res + + +def g(n, hsh, msg): + res = E(LPS(strxor(hsh[:8], pack(">> m = GOST34112012(digest_size=32) + >>> m.update("foo") + >>> m.update("bar") + >>> m.hexdigest() + 'e3c9fd89226d93b489a9fe27d686806e24a514e3787bca053c698ec4616ceb78' + """ + block_size = BLOCKSIZE + + def __init__(self, data=b"", digest_size=64): + """ + :param digest_size: hash digest size to compute + :type digest_size: 32 or 64 bytes + """ + self.data = data + self._digest_size = digest_size + + def copy(self): + return GOST34112012(copy(self.data), self.digest_size) + + @property + def digest_size(self): + return self._digest_size + + def update(self, data): + """ Append data that has to be hashed + """ + self.data += data + + def digest(self): + """ Get hash of the provided data + """ + hsh = BLOCKSIZE * (b"\x01" if self.digest_size == 32 else b"\x00") + chk = bytearray(BLOCKSIZE * b"\x00") + n = 0 + data = self.data + for i in xrange(0, len(data) // BLOCKSIZE * BLOCKSIZE, BLOCKSIZE): + block = data[i:i + BLOCKSIZE] + hsh = g(n, hsh, block) + chk = add512bit(chk, block) + n += 512 + + # Padding + padblock_size = len(data) * 8 - n + data += b"\x01" + padlen = BLOCKSIZE - len(data) % BLOCKSIZE + if padlen != BLOCKSIZE: + data += b"\x00" * padlen + + hsh = g(n, hsh, data[-BLOCKSIZE:]) + n += padblock_size + chk = add512bit(chk, data[-BLOCKSIZE:]) + hsh = g(0, hsh, pack("