python 异或加密字符串的实例

做个简单习题：输入明文给定秘钥，密文还原，按位异或处理。

import base64 as b64

def xor_encrypt(tips,key):
 ltips=len(tips)
 lkey=len(key)
 secret=[]
 num=0
 for each in tips:
 if num>=lkey:
  num=num%lkey
 secret.append( chr( ord(each)^ord(key[num]) ) )
 num+=1

 return b64.b64encode( "".join( secret ).encode() ).decode()


def xor_decrypt(secret,key):

 tips = b64.b64decode( secret.encode() ).decode()

 ltips=len(tips)
 lkey=len(key)
 secret=[]
 num=0
 for each in tips:
 if num>=lkey:
  num=num%lkey

 secret.append( chr( ord(each)^ord(key[num]) ) )
 num+=1

 return "".join( secret )


tips= "1234567"
key= "owen"
secret = xor_encrypt(tips,key)
print( "cipher_text:", secret )

plaintxt = xor_decrypt( secret, key )
print( "plain_text:",plaintxt )