.net 加密常用代码

TripleDES 三重数据加密

public string Encrypt(string data)
    {
      TripleDESCryptoServiceProvider tDES = new TripleDESCryptoServiceProvider();
      tDES.IV = new ASCIIEncoding().GetBytes("12345678"); //8位
      tDES.Key = new ASCIIEncoding().GetBytes("123456789012345678901234");//24位

      //or like this.
      //tDES.GenerateIV();
      //tDES.GenerateKey();


      MemoryStream mStream = new MemoryStream();
      CryptoStream cStream = new CryptoStream(mStream,
                tDES.CreateEncryptor(),
                CryptoStreamMode.Write);

      StreamWriter sw = new StreamWriter(cStream);
      sw.Write(data);
      sw.Flush();
      cStream.FlushFinalBlock();
      mStream.Flush();

     return  Convert.ToBase64String(mStream.GetBuffer(), 0, (int)mStream.Length);
    }

    public string Decrypt(string data)
    {
      TripleDESCryptoServiceProvider tDES = new TripleDESCryptoServiceProvider();
      tDES.IV = new ASCIIEncoding().GetBytes("12345678"); //8位
      tDES.Key = new ASCIIEncoding().GetBytes("123456789012345678901234");//24位密钥
      byte[] byData = Convert.FromBase64String(data);
      MemoryStream mStream = new MemoryStream(byData);
      CryptoStream cStream = new CryptoStream(mStream,
                              tDES.CreateDecryptor(),
                               CryptoStreamMode.Read);

      StreamReader sr = new StreamReader(cStream);

      return sr.ReadToEnd();
    }