作者：未知 来源：月光软件站 加入时间：2005-2-28　月光软件站

 #region TripleDES算法

 public class ClassTripleDES
 {
  public ClassTripleDES()
  {
  }

  //加密，使用密码产生加密算法的公钥，并使用TripleDES对密码进行加密。
  public static string Encrypt(string pass)
  {
   try
   {
    byte[] bt = (new System.Text.UnicodeEncoding()).GetBytes(pass);
    PasswordDeriveBytes pdb = new PasswordDeriveBytes(pass, null);
    byte[] key = pdb.GetBytes(24);
    byte[] iv = pdb.GetBytes(8);
    MemoryStream ms = new MemoryStream();
    TripleDESCryptoServiceProvider tdesc = new TripleDESCryptoServiceProvider();
    CryptoStream cs = new CryptoStream(ms,tdesc.CreateEncryptor(key, iv),CryptoStreamMode.Write);
    cs.Write(bt, 0, bt.Length);
    cs.FlushFinalBlock();
    return Convert.ToBase64String(ms.ToArray());
   }
   catch(Exception ex)
   {
    throw ex;
   }
  }

  //解密，使用密码产生加密算法的公钥，并使用TripleDES对加密数据进行解密。
  public static string Decrypt(string str, string pass)
  {
   try
   {
    byte[] bt = Convert.FromBase64String(str);
    PasswordDeriveBytes pdb = new PasswordDeriveBytes(pass, null);
    byte[] key = pdb.GetBytes(24);
    byte[] iv = pdb.GetBytes(8);
    MemoryStream ms = new MemoryStream();
    TripleDESCryptoServiceProvider tdesc = new TripleDESCryptoServiceProvider();
    CryptoStream cs = new CryptoStream(ms,tdesc.CreateDecryptor(key, iv),CryptoStreamMode.Write);
    cs.Write(bt, 0, bt.Length);
    cs.FlushFinalBlock();
    return (new System.Text.UnicodeEncoding()).GetString(ms.ToArray());
   }
   catch(Exception ex)
   {
    throw ex;
   }
  }
  //使用：
  //string str = Encrypt("bbb");
  //Console.WriteLine(Decrypt(str, "bbb"));

  //加密，使用密码产生加密算法的公钥，并使用TripleDES对密码进行加密。
  public static string EncryptWithKey(string pass, string p_key)
  {
   try
   {
    byte[] bt = (new System.Text.UnicodeEncoding()).GetBytes(pass);
    PasswordDeriveBytes pdb = new PasswordDeriveBytes(p_key, null);
    byte[] key = pdb.GetBytes(24);
    byte[] iv = pdb.GetBytes(8);
    MemoryStream ms = new MemoryStream();
    TripleDESCryptoServiceProvider tdesc = new TripleDESCryptoServiceProvider();
    CryptoStream cs = new CryptoStream(ms,tdesc.CreateEncryptor(key, iv),CryptoStreamMode.Write);
    cs.Write(bt, 0, bt.Length);
    cs.FlushFinalBlock();
    return Convert.ToBase64String(ms.ToArray());
   }
   catch(Exception ex)
   {
    throw ex;
   }
  }

  //解密，使用密码产生加密算法的公钥，并使用TripleDES对加密数据进行解密。
  public static string DecryptWithKey(string str, string p_key)
  {
   try
   {
    byte[] bt = Convert.FromBase64String(str);
    PasswordDeriveBytes pdb = new PasswordDeriveBytes(p_key, null);
    byte[] key = pdb.GetBytes(24);
    byte[] iv = pdb.GetBytes(8);
    MemoryStream ms = new MemoryStream();
    TripleDESCryptoServiceProvider tdesc = new TripleDESCryptoServiceProvider();
    CryptoStream cs = new CryptoStream(ms,tdesc.CreateDecryptor(key, iv),CryptoStreamMode.Write);
    cs.Write(bt, 0, bt.Length);
    cs.FlushFinalBlock();
    return (new System.Text.UnicodeEncoding()).GetString(ms.ToArray());
   }
   catch(Exception ex)
   {
    throw ex;
   }
  }

 }

 #endregion

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