C# 字符串DES加/解密与MD5加密类

C#源码，用.Net封装的类库写的加密和解密的方法，很容易转换成VB.Net

using System;
using System.IO;
using System.Windows.Forms;
using System.Collections.Generic;
using System.Text;
using System.Security.Cryptography;

namespace MyDes
{
  /// <summary>
  /// DES加/解密与MD5加密
  /// </summary>
  public class My_Des
  {
  #region 私有属性

  /// <summary>
  /// MD5加密的字符串
  /// </summary>
  private string md5Str = null;
  /// <summary>
  /// DES加密的字符串
  /// </summary>
  private string encryptStr = null;

  /// <summary>
  /// DES解密的字符串
  /// </summary>
  private string decryptStr = null;

  /// <summary>
  /// DES密匙
  /// </summary>
  private string mydesKey = null;

  /// <summary>
  /// 返回的字符串
  /// </summary>
  private string mydesStr = null;

  /// <summary>
  /// 错误信息
  /// </summary>
  private string messAge = null;

  #endregion

  #region 公共属性

  /// <summary>
  /// MD5加密字符串
  /// </summary>
  public string MD5Str
  {
  get { return md5Str; }
  set { md5Str = value; }
  }
  /// <summary>
  /// DES加密的字符串
  /// </summary>
  public string EncryptStr
  {
  get { return encryptStr; }
  set { encryptStr = value; }
  }

  /// <summary>
  ///DES 解密的字符串
  /// </summary>
  public string DecryptStr
  {
  get { return decryptStr; }
  set { decryptStr = value; }
  }

  /// <summary>
  /// DES密匙
  /// </summary>
  public string MyDesKey
  {
  get { return mydesKey; }
  set { mydesKey = value; }
  }

  /// <summary>
  /// 返回的字符串
  /// </summary>
  public string MyDesStr
  {
  get { return mydesStr; }
  set { mydesStr = value; }
  }
  /// <summary>
  /// 错误信息
  /// </summary>
  public string Message
  {
  get { return messAge; }
  set { messAge = value; }
  }
  #endregion

  #region 公共方法
  /// <summary>
  /// 执行DES加密
  /// </summary>
  public void DesEncrypt()
  {
  try
  {
  byte[] MyStr_E = Encoding.UTF8.GetBytes(this.encryptStr);
  byte[] MyKey_E = Encoding.UTF8.GetBytes(this.mydesKey);

  DESCryptoServiceProvider MyDes_E = new DESCryptoServiceProvider();
  MyDes_E.Key = MyKey_E;
  MyDes_E.IV = MyKey_E;

  MemoryStream MyMem_E = new MemoryStream();

  CryptoStream MyCry_E = new CryptoStream(MyMem_E, MyDes_E.CreateEncryptor(), CryptoStreamMode.Write);
  MyCry_E.Write(MyStr_E, 0, MyStr_E.Length);
  MyCry_E.FlushFinalBlock();
  MyCry_E.Close();

  this.mydesStr = Convert.ToBase64String(MyMem_E.ToArray());
  }
  catch (Exception Error)
  {
  this.messAge = "DES加密出错："+Error.Message;
  }
  }

  /// <summary>
  /// 执行DES解密
  /// </summary>
  public void DesDecrypt()
  {
  try
  {
  byte[] MyStr_D = Convert.FromBase64String(this.decryptStr);
  byte[] MyKey_D = Encoding.UTF8.GetBytes(this.mydesKey);

  DESCryptoServiceProvider MyDes_D = new DESCryptoServiceProvider();
  MyDes_D.Key = MyKey_D;
  MyDes_D.IV = MyKey_D;

  MemoryStream MyMem_D = new MemoryStream();

  CryptoStream MyCry_D = new CryptoStream(MyMem_D, MyDes_D.CreateDecryptor(), CryptoStreamMode.Write);  
  MyCry_D.Write(MyStr_D, 0, MyStr_D.Length);
  MyCry_D.FlushFinalBlock();
  MyCry_D.Close();

  this.mydesStr = Encoding.UTF8.GetString(MyMem_D.ToArray());
  }
  catch (Exception Error)
  {
  this.messAge ="DES解密出错：" +Error.Message;
  }
  }

  /// <summary>
  /// 执行MD5加密
  /// </summary>
  public void MD5JiaMi()
  {
  MD5CryptoServiceProvider MyMD5 = new MD5CryptoServiceProvider();
  try
  {
  Byte[] MyMD5_Str = MyMD5.ComputeHash(Encoding.UTF8.GetBytes(this.md5Str));
  this.MyDesStr = Encoding.UTF8.GetString(MyMD5_Str);
  }
  catch (Exception Error)
  {
  this.messAge ="MD5加密出错："+ Error.Message;
  }

  }

  #endregion
  }
}