import time
import base64
import pyDes
import binascii

def DESEncrypt(desKey,  target):
    key = desKey[0:8]
    IV =desKey[::-1][0:8]
    btKey =key.encode(encoding='utf8')
    btIV  =IV.encode(encoding='utf8')
    k = pyDes.des(btKey, mode=pyDes.CBC, IV=btIV, pad=None, padmode=pyDes.PAD_PKCS5)
    en = k.encrypt(target)
    return en

def GetEncryptBase64(userid,pwd):
    str_time=time.strftime("%Y%m%d")
    char_list = list(str_time)
    int_list=list(map(lambda x:int(x,10),char_list))
    deskey=sum(int_list)
    deskey*=int(str_time,10)
    deskeystr=str(deskey).zfill(8)
    userinfostr=userid+":"+pwd
    userinfoEncryptBytes=DESEncrypt(deskeystr,userinfostr.encode(encoding='utf8'))
    userinfoEncryptBase64 = base64.b64encode(userinfoEncryptBytes).decode('ascii')

    return userinfoEncryptBase64


result=GetEncryptBase64("userid","userpwd")
print("result={}".format(result))

'''
  byte[] DESEncrypt(string desKey, byte[] target)
        {
            if (desKey.Length < 8) throw new Exception("parameter desKey length should equal greater than 8");

            var key = desKey.Substring(0, 8);
            var IV = string.Join("", desKey.Reverse()).Substring(0, 8);
            byte[] btKey = Encoding.UTF8.GetBytes(key);
            byte[] btIV = Encoding.UTF8.GetBytes(IV);
            DESCryptoServiceProvider des = new DESCryptoServiceProvider();

            using (MemoryStream ms = new MemoryStream())
            {
                using (CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(btKey, btIV), CryptoStreamMode.Write))
                {
                    cs.Write(target, 0, target.Length);
                    cs.FlushFinalBlock();
                }
                return ms.ToArray();
            }
        }

 public string  GetEncryptBase64(string userid, string pwd)
        {
            Int64 deskey = DateTime.Now.ToString("yyyyMMdd").Sum(c => Convert.ToInt32(c.ToString()));
            deskey *= Convert.ToInt32(DateTime.Now.ToString("yyyyMMdd"));
            string deskeystr = deskey.ToString().PadLeft(8, '0');

            string userinfostr = userid + ":" + pwd;
            var userinfoEncryptBytes = DESEncrypt(deskeystr, Encoding.UTF8.GetBytes(userinfostr));
            var userinfoEncryptBase64 = Convert.ToBase64String(userinfoEncryptBytes);
            return userinfoEncryptBase64;
        }
'''