Python Des加密解密如何实现软件注册码机器码

# coding: utf-8
 
import win32api
import pyDes
from binascii import b2a_hex, a2b_hex
import base64
import os
def getCVolumeSerialNumber():
  CVolumeSerialNumber=win32api.GetVolumeInformation("C:\\")[1]
  # print(CVolumeSerialNumber)
  if CVolumeSerialNumber:
    return str(CVolumeSerialNumber)
  else:
    return 0
 
def DesEncrypt(str):
  k = pyDes.des(Des_Key, pyDes.CBC, Des_IV, pad=None, padmode=pyDes.PAD_PKCS5)
  encryptStr = k.encrypt(str)
  string = base64.b64encode(encryptStr)
  # print(string)
  return string # 转base64编码返回
 
def DesDecrypt(string):
  string = base64.b64decode(string)
  k = pyDes.des(Des_Key, pyDes.CBC, Des_IV, pad=None, padmode=pyDes.PAD_PKCS5)
  decryptStr = k.decrypt(string)
  # print(decryptStr)
  return decryptStr
 
Des_Key = "12345678" # Key
Des_IV = "12345678" # 自定IV向量
def Register():
  if os.path.isfile('conf.bin'):
    with open('conf.bin', 'rb') as fp:
      key = a2b_hex(fp.read())
      print(key)
    serialnumber = getCVolumeSerialNumber()
    decryptstr = DesDecrypt(key).decode('utf8')
    print(decryptstr)
    if serialnumber in decryptstr:
      if 'Buy' in decryptstr:
        print('>> Buy')
        print(">> 验证完成")
        return 1
      elif 'Trial' in decryptstr:
        print('>> Trial')
        return 2
  rand = str(random.randrange(1, 1000))
  serialnumber = getCVolumeSerialNumber() + rand
  print(serialnumber)
  encryptstr = DesEncrypt(serialnumber).decode('utf8')
  print(">> 序列号:", encryptstr)
  while True:
    key = input(">> 验证码:")
    try:
      decryptstr = DesDecrypt(key.encode('utf8')).decode('utf8')
      print(decryptstr)
      if serialnumber in decryptstr:
        if 'Buy' in decryptstr:
          print('>> Buy')
          with open('conf.bin', 'wb') as fp:
            fp.write(b2a_hex(key.encode('utf8')))
            print(">> 验证完成")
          return 1
        elif 'Trial' in decryptstr:
          print('>> Trial')
          return 2
    except Exception as e:
      print(e)
      print(">> 输入错误")
      continue