对称加密之---AES加密

#!/usr/bin/env python
# -*- coding: utf-8 -*-

from Crypto.Cipher import AES
import base64
import os

BLOCK_SIZE = 16
PADDING = ‘\0‘    #文本补全方式
pad_it = lambda s: s+(16 - len(s)%16)*PADDING 
key = ‘16bit‘    #key的长度必须为16的倍数
iv = ‘0000000000000000’  #偏移量

#使用aes算法，进行加密解密操作
#为跟java实现同样的编码，注意PADDING符号自定义
#加密
def encrypt_aes(sourceStr):
    generator = AES.new(key, AES.MODE_CBC, iv) #MODE_CBC为加密模式
    crypt = generator.encrypt(pad_it(sourceStr))
    cryptedStr = base64.b64encode(crypt)
    return cryptedStr

#解密
def decrypt_aes(cryptedStr):
    generator = AES.new(key, AES.MODE_CBC, iv)
    cryptedStr = base64.b64decode(cryptedStr)
    recovery = generator.decrypt(cryptedStr)
    decryptedStr = recovery.rstrip(PADDING)
    return decryptedStr

sourceStr = ‘password^*(&( 09-8ADF‘


print encrypt_aes(sourceStr)
print decrypt_aes(encrypt_aes(sourceStr))