加密解密

取得机器CPU的ID的前八位作为密钥：

using System.Security .Cryptography;
using System.Management;
public static string GetProcessID()
{
 try
 {
  string str1 = string.Empty;
  ManagementClass mcCpu = new ManagementClass("win32_Processor");
  ManagementObjectCollection mocCpu = mcCpu.GetInstances();
  foreach (ManagementObject m in mocCpu)
  {
   str1 = m["ProcessorId"].ToString().Trim().Substring(0, 8);
  }
  return str1;
 }
 catch (Exception ex)
 {
  return "zhenxing"; //如果失败取默认的密钥
 }
}

 

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加密算法

public static string Encode(string data) 
{
 byte[] aKey = System.Text.ASCIIEncoding.ASCII.GetBytes(GetProcessID());
 byte[] aIV = System.Text.ASCIIEncoding.ASCII.GetBytes(GetProcessID());
 DESCryptoServiceProvider cp = new DESCryptoServiceProvider();
 MemoryStream ms = new MemoryStream();
 CryptoStream cs = new CryptoStream(ms, cp.CreateEncryptor(aKey, aIV), CryptoStreamMode.Write);
 StreamWriter sw = new StreamWriter(cs);
 sw.Write(data);
 sw.Flush();
 cs.FlushFinalBlock();
 sw.Flush();
 return Convert.ToBase64String(ms.GetBuffer(), 0, (int)ms.Length);
}

 

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解密

public static string Decode(string data)
{
 byte[] aKey = System.Text.ASCIIEncoding.ASCII.GetBytes(GetProcessID());
 byte[] aIV = System.Text.ASCIIEncoding.ASCII.GetBytes(GetProcessID());
 byte[] Enc;
 try
 {
  Enc = Convert.FromBase64String(data);
 }
 catch(Exception ex)
 {
  return null;
 }
 try
 {
  DESCryptoServiceProvider cp = new DESCryptoServiceProvider();
  MemoryStream ms = new MemoryStream(Enc);
  CryptoStream cs = new CryptoStream(ms, cp.CreateDecryptor(aKey, aIV), CryptoStreamMode.Read);
  StreamReader sr = new StreamReader(cs);
  return sr.ReadToEnd();
 }
 catch(Exception ex)
 {
  throw ex;
 }
}