一个python自定义的加密解密函数，python加密解密,def encrypt(

一个python自定义的加密解密函数，python加密解密,def encrypt(

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" key = 15 s1 = encrypt(key, 'hello world') s2 = decrypt(key, s1) print s1,'\n',s2  # HGKGDGDGAGPCIHAGNHDGLG # hello world