Python AES加密实例解析

#coding=utf-8 ''''' 加密的一方和解密的一方必须提前确定好key值 ''' from Crypto.Cipher import AES from binascii import b2a_hex, a2b_hex  class MyCrypto():   def __init__(self, key):     self.key_len = len(key)     if not self.key_len == 16 and not self.key_len == 24 and not self.key_len == 32:       raise Exception("length of key is wrong")     self.key = key     self.mode = AES.MODE_CBC  #这种模式更加安全    def encrypt(self, text):     '''''       被加密的明文长度必须是key长度的整数倍,如果不够,则用/0进行填充       转成16进制字符串,是因为避免不可见的ascii在显示的时候捣乱     '''     cryptor = AES.new(self.key, self.mode, self.key)     count = len(text)     add = self.key_len - (count % self.key_len)     text = text + ('/0' * add)     self.ciphertext = cryptor.encrypt(text)     return b2a_hex(self.ciphertext)     def decrypt(self, text):     '''''       解密后需注意,加密时有可能填充/0,因此要去掉右侧的/0     '''     cryptor = AES.new(self.key, self.mode, self.key)     plain_text = cryptor.decrypt(a2b_hex(text))     return plain_text.rstrip('/0')   if __name__ == '__main__':   mc = MyCrypto("kwsy_zds20160822")   e = mc.encrypt("张东升")   d = mc.decrypt(e)   print e,d