python md5 加密模塊

今天有同學找到我說，能不能寫一個簡單的python md5加密模塊，作爲服務器端程序的響應函數。信息安全之類的問題了。md5採用單向加密機制。

直接上代碼：

(k1, k2 是系統自動生成的隨機整數，user_name是用戶名)

def encrypt (a="user_name" , k1=1 , k2=1):
    #get system time
    b = time.strftime('%Y%m%d%H%M',time.localtime(time.time()))
    ka1 = k1; ka2 = k2
    Str = list(a+b)
    Len = len(Str)
    array1 = [0]*Len; array2 = [0]*Len

    #re_str1, md5 digest of array1 
    array1 = [ chr( ord(Str[i]) ^ ka1) for i in range (0,Len)]
    tmp1 = ''.join(array1)
    re_str1 = hashlib.md5(tmp1.encode('utf-8')).hexdigest()
    re_str1 = list(re_str1)

    #re_str2, md5 digest of array2
    array2 = [ chr( ord(Str[i]) ^ ka2) for i in range (0,Len)]
    tmp2 = ''.join(array2)
    re_str2 = hashlib.md5(tmp2.encode('utf-8')).hexdigest()
    re_str2 = list(re_str2)   
         
    resultf = ""
    value = [ord(re_str1[i*4+3])^ord(re_str2[i*4+3]) for i in range(0,8)]
    for i in range (0,8):
        resultf += '%d'%(value[i]%10)
    return resultf

if __name__ == "__main__":
    import string
    import hashlib
    import time
    print encrypt("te",13,23)