root@ProFtp:/usr/lib/python2.7# more jastmencrypt.py
"""
jastme encrypt password
"""
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"

In [1]: import jastmencrypt
 
In [3]: jastmencrypt.encrypt(119,'mypassword')        加密
Out[3]: u'KBOAHAGBEAEAAAIBFADB'
 
In [4]: jastmencrypt.decrypt(119,'KBOAHAGBEAEAAAIBFADB')   解密
Out[4]: u'mypassword'