兩年前使用python時，碰到2.x下AES加密解密算法代碼無法在3.x下順利運行，花點時間解決了兼容問題，在2.7、3.6、3.7下運行良好。

Linux系統安裝依賴庫比較簡單，Windows下稍嫌繁瑣，裝完必須的庫也可以正常運行。

代碼整理如下：

# -*- coding: utf-8 -*-

import base64

import sys

from Crypto import Random

from Crypto.Cipher import AES

# Author: areful

# Date: 2017-07-06

class AESCipher:

def __init__(self, key, iv=Random.new().read(AES.block_size)):

self.key = key

self.iv = iv

self.mode = AES.MODE_CBC

if sys.version > '3':

self.PY3 = True

else:

self.PY3 = False

def encrypt(self, text):

if self.PY3:

return self.encrypt36(text)

else:

return self.encrypt27(text)

def encrypt27(self, text):

cipher = AES.new(self.key, AES.MODE_CBC, self.iv)

bs = AES.block_size

text_length = len(text)

amount_to_pad = bs - (text_length % bs)

if amount_to_pad == 0:

amount_to_pad = bs

pad = chr(amount_to_pad)

text1 = text + pad * amount_to_pad

cipher_text = cipher.encrypt(text1)

return base64.b64encode(cipher_text)

def encrypt36(self, text):

cipher = AES.new(self.key, AES.MODE_CBC, self.iv)

bs = AES.block_size

text_length = len(text.encode('utf-8'))

amount_to_pad = bs - (text_length % bs)

if amount_to_pad == 0:

amount_to_pad = bs

pad = chr(amount_to_pad)

text1 = text + pad * amount_to_pad

cipher_text = cipher.encrypt(text1)

encrypted_str = str(base64.b64encode(cipher_text), encoding='utf-8')

return encrypted_str

def decrypt(self, text):

import base64

base_text = base64.b64decode(text)

cipher = AES.new(self.key, self.mode, self.iv)

plain_text = cipher.decrypt(base_text).decode('utf-8')

pad = ord(plain_text[-1])

ne = plain_text[:-pad]

return ne

@staticmethod

def pad(s):

bs = AES.block_size

return s + (bs - len(s) % bs) * chr(bs - len(s) % bs)

@staticmethod

def unpad(s):

return s[0:-ord(s[-1])]

@staticmethod

def __pad(text):

text_length = len(text)

amount_to_pad = AES.block_size - (text_length % AES.block_size)

if amount_to_pad == 0:

amount_to_pad = AES.block_size

pad = chr(amount_to_pad)

return text + pad * amount_to_pad

@staticmethod

def __unpad(text):

pad = ord(text[-1])

return text[:-pad]

@staticmethod

def test(key, iv, text):

cipher = AESCipher(key, iv)

encrypted_msg = cipher.encrypt(text)

print(encrypted_msg)

msg = cipher.decrypt(encrypted_msg)

print(msg)

if __name__ == '__main__':

AESCipher.test('ABCDEFGHICKLMNOP',

bytes(bytearray(b'x01x02x03x04x05x06x07x08x41x42x43x44x45x46x47x48')),

'areful.測試文本')

總結

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