纯python实现的AES加解密

#!python
# -*- coding:utf-8 -*-
#
# aes.py: implements AES - Advanced Encryption Standard
# from the SlowAES project http://code.google.com/p/slowaes/
#
# Copyright （c） 2008    Josh Davis （ http://www.josh-davis.org ）
#           Alex Martelli （ http://www.aleax.it ）
#
# Ported from C code written by Laurent Haan （ http://www.progressive-coding.com ）
#
# Licensed under the Apache License Version 2.0
# http://www.apache.org/licenses/
#
“““
公用函数（aes加密），仅支持 py2， 不支持py3（py3只支持纯英文）
Created on 2016/9/2
Updated on 2016/9/7
@author: Holemar
“““
import sys
import math
import random

class AES（object）:
    ‘‘‘AES funtions for a single block
    ‘‘‘
    # Very annoying code:  all is for an object but no state is kept!
    # Should just be plain functions in a AES modlule.

    # valid key sizes
    KeySize_128 = 16
    KeySize_192 = 24
    KeySize_256 = 32

    # structure of supported modes of operation
    MODE_OFB = 0
    MODE_CFB = 1
    MODE_CBC = 2

    # Rijndael S-box
    sbox =  （ 0x630x7c0x770x7b0xf20x6b0x6f0xc50x300x010x670x2b0xfe0xd70xab0x76
            0xca0x820xc90x7d0xfa0x590x470xf00xad0xd40xa20xaf0x9c0xa40x720xc0
            0xb70xfd0x930x260x360x3f0xf70xcc0x340xa50xe50xf10x710xd80x310x15
            0x040xc70x230xc30x180x960x050x9a0x070x120x800xe20xeb0x270xb20x75
            0x090x830x2c0x1a0x1b0x6e0x5a0xa00x520x3b0xd60xb30x290xe30x2f0x84
            0x530xd10x000xed0x200xfc0xb10x5b0x6a0xcb0xbe0x390x4a0x4c0x580xcf
            0xd00xef0xaa0xfb0x430x4d0x330x850x450xf90x020x7f0x500x3c0x9f0xa8
            0x510xa30x400x8f0x920x9d0x380xf50xbc0xb60xda0x210x100xff0xf30xd2
            0xcd0x0c0x130xec0x5f0x970x440x170xc40xa70x7e0x3d0x640x5d0x190x73
            0x600x810x4f0xdc0x220x2a0x900x880x460xee0xb80x140xde0x5e0x0b0xdb
            0xe00x320x3a0x0a0x490x060x240x5c0xc20xd30xac0x620x910x950xe40x79
            0xe70xc80x370x6d0x8d0xd50x4e0xa90x6c0x560xf40xea0x650x7a0xae0x08
            0xba0x780x250x2e0x1c0xa60xb40xc60xe80xdd0x740x1f0x4b0xbd0x8b0x8a
            0x700x3e0xb50x660x480x030xf60x0e0x610x350x570xb90x860xc10x1d0x9e
            0xe10xf80x980x110x690xd90x8e0x940x9b0x1e0x870xe90xce0x550x280xdf
            0x8c0xa10x890x0d0xbf0xe60x420x680x410x990x2d0x0f0xb00x540xbb0x16 ）

    # Rijndael Inverted S-box
    rsbox = [0x52 0x09 0x6a 0xd5 0x30 0x36 0xa5 0x38 0xbf 0x40 0xa3
            0x9e 0x81 0xf3 0xd7 0xfb  0x7c 0xe3 0x39 0x82 0x9b 0x2f
            0xff 0x87 0x34 0x8e 0x43 0x44 0xc4 0xde 0xe9 0xcb  0x54
            0x7b 0x94 0x32 0xa6 0xc2 0x23 0x3d 0xee 0x4c 0x95 0x0b
            0x42 0xfa 0xc3 0x4e  0x08 0x2e 0xa1 0x66 0x28 0xd9 0x24
            0xb2 0x76 0x5b 0xa2