Module refinery.units.crypto.cipher.isaac
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#!/usr/bin/env python3
# -*- coding: utf-8 -*-
from operator import __lshift__, __rshift__
from typing import Iterable, List
from refinery.lib import chunks
from refinery.units.crypto.cipher import StreamCipherUnit
class isaac(StreamCipherUnit):
"""
The ISAAC (Indirection, Shift, Accumulate, Add, Count) cipher.
"""
def keystream(self) -> Iterable[int]:
key = self.args.key
A: int = 0
B: int = 0
C: int = 0
S: List[int] = [0x9E3779B9] * 8
T: List[int] = []
K = list(chunks.unpack(key + bytearray(0x400 - len(key)), 4, bigendian=False))
U = 0xFFFFFFFF
def _mix_state():
a, b, c, d, e, f, g, h = S
a ^= (b << 0x0B) & U; d = d + a & U; b = b + c & U # noqa
b ^= (c >> 0x02) & U; e = e + b & U; c = c + d & U # noqa
c ^= (d << 0x08) & U; f = f + c & U; d = d + e & U # noqa
d ^= (e >> 0x10) & U; g = g + d & U; e = e + f & U # noqa
e ^= (f << 0x0A) & U; h = h + e & U; f = f + g & U # noqa
f ^= (g >> 0x04) & U; a = a + f & U; g = g + h & U # noqa
g ^= (h << 0x08) & U; b = b + g & U; h = h + a & U # noqa
h ^= (a >> 0x09) & U; c = c + h & U; a = a + b & U # noqa
S[:] = a, b, c, d, e, f, g, h
return S
def _initialize_with(R: List[int]):
for i in range(0, 0x100, 8):
S[:] = (x + R[j] & U for j, x in enumerate(S, i))
T[i:i + 8] = _mix_state()
for _ in range(4):
_mix_state()
_initialize_with(K)
_initialize_with(T)
operations = [
(__lshift__, 0x0D),
(__rshift__, 0x06),
(__lshift__, 0x02),
(__rshift__, 0x10),
]
while True:
C = (C + 1) & U
B = (B + C) & U
for i in range(0x100):
X = T[i]
shift, k = operations[i % 4]
A = (A ^ shift(A, k)) & U
A = (A + T[i ^ 0x80]) & U
Y = T[+i] = T[X // 4 & 0xFF] + A + B & U
B = K[~i] = X + T[Y // 1024 & 0xFF] & U
yield from chunks.pack(K, 4, True)Classes
class isaac (key, discard=0, stateful=False)-
The ISAAC (Indirection, Shift, Accumulate, Add, Count) cipher.
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class isaac(StreamCipherUnit): """ The ISAAC (Indirection, Shift, Accumulate, Add, Count) cipher. """ def keystream(self) -> Iterable[int]: key = self.args.key A: int = 0 B: int = 0 C: int = 0 S: List[int] = [0x9E3779B9] * 8 T: List[int] = [] K = list(chunks.unpack(key + bytearray(0x400 - len(key)), 4, bigendian=False)) U = 0xFFFFFFFF def _mix_state(): a, b, c, d, e, f, g, h = S a ^= (b << 0x0B) & U; d = d + a & U; b = b + c & U # noqa b ^= (c >> 0x02) & U; e = e + b & U; c = c + d & U # noqa c ^= (d << 0x08) & U; f = f + c & U; d = d + e & U # noqa d ^= (e >> 0x10) & U; g = g + d & U; e = e + f & U # noqa e ^= (f << 0x0A) & U; h = h + e & U; f = f + g & U # noqa f ^= (g >> 0x04) & U; a = a + f & U; g = g + h & U # noqa g ^= (h << 0x08) & U; b = b + g & U; h = h + a & U # noqa h ^= (a >> 0x09) & U; c = c + h & U; a = a + b & U # noqa S[:] = a, b, c, d, e, f, g, h return S def _initialize_with(R: List[int]): for i in range(0, 0x100, 8): S[:] = (x + R[j] & U for j, x in enumerate(S, i)) T[i:i + 8] = _mix_state() for _ in range(4): _mix_state() _initialize_with(K) _initialize_with(T) operations = [ (__lshift__, 0x0D), (__rshift__, 0x06), (__lshift__, 0x02), (__rshift__, 0x10), ] while True: C = (C + 1) & U B = (B + C) & U for i in range(0x100): X = T[i] shift, k = operations[i % 4] A = (A ^ shift(A, k)) & U A = (A + T[i ^ 0x80]) & U Y = T[+i] = T[X // 4 & 0xFF] + A + B & U B = K[~i] = X + T[Y // 1024 & 0xFF] & U yield from chunks.pack(K, 4, True)Ancestors
Class variables
var key_sizevar block_size
Methods
def keystream(self)-
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def keystream(self) -> Iterable[int]: key = self.args.key A: int = 0 B: int = 0 C: int = 0 S: List[int] = [0x9E3779B9] * 8 T: List[int] = [] K = list(chunks.unpack(key + bytearray(0x400 - len(key)), 4, bigendian=False)) U = 0xFFFFFFFF def _mix_state(): a, b, c, d, e, f, g, h = S a ^= (b << 0x0B) & U; d = d + a & U; b = b + c & U # noqa b ^= (c >> 0x02) & U; e = e + b & U; c = c + d & U # noqa c ^= (d << 0x08) & U; f = f + c & U; d = d + e & U # noqa d ^= (e >> 0x10) & U; g = g + d & U; e = e + f & U # noqa e ^= (f << 0x0A) & U; h = h + e & U; f = f + g & U # noqa f ^= (g >> 0x04) & U; a = a + f & U; g = g + h & U # noqa g ^= (h << 0x08) & U; b = b + g & U; h = h + a & U # noqa h ^= (a >> 0x09) & U; c = c + h & U; a = a + b & U # noqa S[:] = a, b, c, d, e, f, g, h return S def _initialize_with(R: List[int]): for i in range(0, 0x100, 8): S[:] = (x + R[j] & U for j, x in enumerate(S, i)) T[i:i + 8] = _mix_state() for _ in range(4): _mix_state() _initialize_with(K) _initialize_with(T) operations = [ (__lshift__, 0x0D), (__rshift__, 0x06), (__lshift__, 0x02), (__rshift__, 0x10), ] while True: C = (C + 1) & U B = (B + C) & U for i in range(0x100): X = T[i] shift, k = operations[i % 4] A = (A ^ shift(A, k)) & U A = (A + T[i ^ 0x80]) & U Y = T[+i] = T[X // 4 & 0xFF] + A + B & U B = K[~i] = X + T[Y // 1024 & 0xFF] & U yield from chunks.pack(K, 4, True)
Inherited members