Python Crypt functions

23号

淘到一个Python Crypt functions:
import binascii
 from Crypto.Cipher import DES
 
 def hex2byte(hexstring):
     s = []
     for ch in hexstring:
         if ch.lower() in '01234567890abcdef':
             s.append(ch)
         else:
             s.append('f')
     return ''.join(s)
            
 def xor(*args):
     arg1 = args[0]
     for arg in args[1:]:
         s = []
         for i, ch in enumerate(arg):
             s.append(chr(ord(arg1) ^ ord(ch)))
         arg1 = ''.join(s)
     return arg1
 
 def get_main_key():
     lmk = DES.new('password', DES.MODE_ECB)
     return lmk
 
 def encrypt(word, key=None):
     if not key:
         key = get_main_key()
     w = (word + ' '*8)
     word = w[:len(w)/8*8]
     return binascii.b2a_hex(key.encrypt(word))
 
 def decrypt(word, key=None):
     if not key:
         key = get_main_key()
     return key.decrypt(binascii.a2b_hex(word)).strip()
 
 def main():
     a = "hello"
     b = encrypt(a)
     print b
     print decrypt(b)
 
 if __name__ == '__main__':
     main()


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