From c46b98f1635a22b88c6ed7417860365a06660ae3 Mon Sep 17 00:00:00 2001 From: Mark Qvist Date: Wed, 8 Jun 2022 21:03:58 +0200 Subject: [PATCH] Added python-only fallback for SHA-256 and SHA-512 --- RNS/Cryptography/Hashes.py | 20 ++++++- RNS/Cryptography/SHA256.py | 111 +++++++++++++++++++++++++++++++++++ RNS/Cryptography/SHA512.py | 111 +++++++++++++++++++++++++++++++++++ RNS/Cryptography/__init__.py | 1 + 4 files changed, 240 insertions(+), 3 deletions(-) create mode 100644 RNS/Cryptography/SHA256.py create mode 100644 RNS/Cryptography/SHA512.py diff --git a/RNS/Cryptography/Hashes.py b/RNS/Cryptography/Hashes.py index 4bb1db7..c5df96d 100644 --- a/RNS/Cryptography/Hashes.py +++ b/RNS/Cryptography/Hashes.py @@ -1,4 +1,18 @@ -import hashlib +import importlib +if importlib.util.find_spec('hashlib') != None: + import hashlib +else: + hashlib = None + +if hasattr(hashlib, "sha512"): + from hashlib import sha512 as ext_sha512 +else: + from .SHA512 import sha512 as ext_sha512 + +if hasattr(hashlib, "sha256"): + from hashlib import sha256 as ext_sha256 +else: + from .SHA256 import sha256 as ext_sha256 """ The SHA primitives are abstracted here to allow platform- @@ -8,13 +22,13 @@ calls in RNS end up here. """ def sha256(data): - digest = hashlib.sha256() + digest = ext_sha256() digest.update(data) return digest.digest() def sha512(data): - digest = hashlib.sha512() + digest = ext_sha512() digest.update(data) return digest.digest() diff --git a/RNS/Cryptography/SHA256.py b/RNS/Cryptography/SHA256.py new file mode 100644 index 0000000..ac9043f --- /dev/null +++ b/RNS/Cryptography/SHA256.py @@ -0,0 +1,111 @@ +#!/usr/bin/python +__author__ = 'Thomas Dixon' +__license__ = 'MIT' + +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) diff --git a/RNS/Cryptography/SHA512.py b/RNS/Cryptography/SHA512.py new file mode 100644 index 0000000..286fd4d --- /dev/null +++ b/RNS/Cryptography/SHA512.py @@ -0,0 +1,111 @@ +#!/usr/bin/python +__author__ = 'Thomas Dixon' +__license__ = 'MIT' + +import copy, struct, sys + +def new(m=None): + return sha512(m) + +class sha512(object): + _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) + _h = (0x6a09e667f3bcc908, 0xbb67ae8584caa73b, 0x3c6ef372fe94f82b, 0xa54ff53a5f1d36f1, + 0x510e527fade682d1, 0x9b05688c2b3e6c1f, 0x1f83d9abfb41bd6b, 0x5be0cd19137e2179) + _output_size = 8 + + blocksize = 1 + block_size = 128 + digest_size = 64 + + 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 << (64-y))) & 0xFFFFFFFFFFFFFFFF + + def _sha512_process(self, chunk): + w = [0]*80 + w[0:16] = struct.unpack('!16Q', chunk) + + for i in range(16, 80): + s0 = self._rotr(w[i-15], 1) ^ self._rotr(w[i-15], 8) ^ (w[i-15] >> 7) + s1 = self._rotr(w[i-2], 19) ^ self._rotr(w[i-2], 61) ^ (w[i-2] >> 6) + w[i] = (w[i-16] + s0 + w[i-7] + s1) & 0xFFFFFFFFFFFFFFFF + + a,b,c,d,e,f,g,h = self._h + + for i in range(80): + s0 = self._rotr(a, 28) ^ self._rotr(a, 34) ^ self._rotr(a, 39) + maj = (a & b) ^ (a & c) ^ (b & c) + t2 = s0 + maj + s1 = self._rotr(e, 14) ^ self._rotr(e, 18) ^ self._rotr(e, 41) + ch = (e & f) ^ ((~e) & g) + t1 = h + s1 + ch + self._k[i] + w[i] + + h = g + g = f + f = e + e = (d + t1) & 0xFFFFFFFFFFFFFFFF + d = c + c = b + b = a + a = (t1 + t2) & 0xFFFFFFFFFFFFFFFF + + self._h = [(x+y) & 0xFFFFFFFFFFFFFFFF 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) >= 128: + self._sha512_process(self._buffer[:128]) + self._buffer = self._buffer[128:] + + def digest(self): + mdi = self._counter & 0x7F + length = struct.pack('!Q', self._counter<<3) + + if mdi < 112: + padlen = 111-mdi + else: + padlen = 239-mdi + + r = self.copy() + r.update(b'\x80'+(b'\x00'*(padlen+8))+length) + return b''.join([struct.pack('!Q', i) for i in r._h[:self._output_size]]) + + def hexdigest(self): + return self.digest().encode('hex') + + def copy(self): + return copy.deepcopy(self) diff --git a/RNS/Cryptography/__init__.py b/RNS/Cryptography/__init__.py index 4ca7c4d..df48444 100644 --- a/RNS/Cryptography/__init__.py +++ b/RNS/Cryptography/__init__.py @@ -2,6 +2,7 @@ import os import glob from .Hashes import sha256 +from .Hashes import sha512 from .HKDF import hkdf from .PKCS7 import PKCS7 from .Fernet import Fernet