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

def encrypt(key, s):

b = bytearray(str(s).encode("gbk"))

n = len(b) # 求出 b 的字节数

c = bytearray(n*2)

j = 0

for i in range(0, n):

b1 = b[i]

b2 = b1 ^ key # b1 = b2^ key

c1 = b2 % 16

c2 = b2 // 16 # b2 = c2*16 + c1

c1 = c1 + 65

c2 = c2 + 65 # c1,c2都是0~15之间的数,加上65就变成了A-P 的字符的编码

c[j] = c1

c[j+1] = c2

j = j+2

return c.decode("gbk")

def decrypt(key, s):

c = bytearray(str(s).encode("gbk"))

n = len(c) # 计算 b 的字节数

if n % 2 != 0 :

return ""

n = n // 2

b = bytearray(n)

j = 0

for i in range(0, n):

c1 = c[j]

c2 = c[j+1]

j = j+2

c1 = c1 - 65

c2 = c2 - 65

b2 = c2*16 + c1

b1 = b2^ key

b[i]= b1

try:

return b.decode("gbk")

except:

return "failed"

def main():

key = 234

s1 = encrypt(key, 'hello world')

s2 = decrypt(key, s1)

print s1,s2

if __name__ == '__main__':

main()