C# Rijndael Encrypt加密/Decrypt解密算法

/// <summary>
/// Rijndael加密
/// </summary>
/// <param name="clearText">明文</param>
/// <param name="key">key:8位</param>
/// <param name="iv">iv:8位</param>
/// <returns></returns>
public static string RijndaelEncrypt(string clearText, string key, string iv)
{
  try
  {
    if (String.IsNullOrWhiteSpace(clearText)) return "";
    
    RijndaelManaged Rijndael = new RijndaelManaged();
    
    byte[] bytIn = UTF8Encoding.UTF8.GetBytes(clearText);
    MemoryStream ms = new MemoryStream();
    Rijndael.Key = GetLegalKey(Rijndael, key);
    Rijndael.IV = GetLegalIV(Rijndael, iv);
    ICryptoTransform encrypto = Rijndael.CreateEncryptor();
    CryptoStream cs = new CryptoStream(ms, encrypto, CryptoStreamMode.Write);
    cs.Write(bytIn, 0, bytIn.Length);
    cs.FlushFinalBlock();
    ms.Close();
    byte[] bytOut = ms.ToArray();
    return Convert.ToBase64String(bytOut);
  }
  catch
  {
    return string.Empty;
  }
}

//来源:C/S框架网 | www.csframework.com | QQ:23404761

/// <summary>
/// Rijndael解密
/// </summary>
/// <param name="encryptedText">加密的文本</param>
/// <param name="key">key:8位</param>
/// <param name="iv">iv:8位</param>
/// <returns></returns>
public static string RijndaelDecrypt(string encryptedText, string key, string iv)
{
  try
  {
    if (String.IsNullOrWhiteSpace(encryptedText)) return "";
    
    RijndaelManaged Rijndael = new RijndaelManaged();
    byte[] bytIn = Convert.FromBase64String(encryptedText);
    MemoryStream ms = new MemoryStream(bytIn, 0, bytIn.Length);
    Rijndael.Key = GetLegalKey(Rijndael, key);
    Rijndael.IV = GetLegalIV(Rijndael, iv);
    ICryptoTransform encrypto = Rijndael.CreateDecryptor();
    CryptoStream cs = new CryptoStream(ms, encrypto, CryptoStreamMode.Read);
    StreamReader sr = new StreamReader(cs);
    return sr.ReadToEnd();
  }
  catch
  {
    return string.Empty;
  }
}

//来源:C/S框架网 | www.csframework.com | QQ:23404761

/// <summary>
/// 获得密钥
/// </summary>
/// <returns>密钥</returns>
private static byte[] GetLegalKey(RijndaelManaged Rijndael, string key)
{
  string KeyTemp = key;
  Rijndael.GenerateKey();
  byte[] bytTemp = Rijndael.Key;
  int KeyLength = bytTemp.Length;
  if (KeyTemp.Length > KeyLength)
  KeyTemp = KeyTemp.Substring(0, KeyLength);
  else if (KeyTemp.Length < KeyLength)
  KeyTemp = KeyTemp.PadRight(KeyLength, ' ');
  return ASCIIEncoding.ASCII.GetBytes(KeyTemp);
}

/// <summary>
/// 获得初始向量IV
/// </summary>
/// <returns>初试向量IV</returns>
private static byte[] GetLegalIV(RijndaelManaged Rijndael, string iv)
{
  string IVTemp = iv;
  Rijndael.GenerateIV();
  byte[] bytTemp = Rijndael.IV;
  int IVLength = bytTemp.Length;
  if (IVTemp.Length > IVLength)
  IVTemp = IVTemp.Substring(0, IVLength);
  else if (IVTemp.Length < IVLength)
  IVTemp = IVTemp.PadRight(IVLength, ' ');
  return ASCIIEncoding.ASCII.GetBytes(IVTemp);
}


//来源:C/S框架网 | www.csframework.com | QQ:23404761