discuz的DES加密字符串和解密字符串

来源：互联网发布：分布式数据库的实现编辑：程序博客网时间：2024/06/02 05:30

public class DES
{

  //默认密钥向量
  private static byte[] Keys = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };


  /// <summary>
  /// DES加密字符串
  /// </summary>
  /// <param name="encryptString">待加密的字符串</param>
  /// <param name="encryptKey">加密密钥,要求为8位</param>
  /// <returns>加密成功返回加密后的字符串,失败返回源串</returns>
  public static string Encode(string encryptString, string encryptKey)
  {
   encryptKey = Utils.GetSubString(encryptKey, 8, "");
   encryptKey = encryptKey.PadRight(8, ' ');
   byte[] rgbKey = Encoding.UTF8.GetBytes(encryptKey.Substring(0, 8));
   byte[] rgbIV = Keys;
   byte[] inputByteArray = Encoding.UTF8.GetBytes(encryptString);
   DESCryptoServiceProvider dCSP = new DESCryptoServiceProvider();
   MemoryStream mStream = new MemoryStream();
   CryptoStream cStream = new CryptoStream(mStream, dCSP.CreateEncryptor(rgbKey, rgbIV), CryptoStreamMode.Write);
   cStream.Write(inputByteArray, 0, inputByteArray.Length);
   cStream.FlushFinalBlock();
   return Convert.ToBase64String(mStream.ToArray());

  }

  /// <summary>
  /// DES解密字符串
  /// </summary>
  /// <param name="decryptString">待解密的字符串</param>
  /// <param name="decryptKey">解密密钥,要求为8位,和加密密钥相同</param>
  /// <returns>解密成功返回解密后的字符串,失败返源串</returns>
  public static string Decode(string decryptString, string decryptKey)
  {
   try
   {
    decryptKey = Utils.GetSubString(decryptKey, 8, "");
    decryptKey = decryptKey.PadRight(8, ' ');
    byte[] rgbKey = Encoding.UTF8.GetBytes(decryptKey);
    byte[] rgbIV = Keys;
    byte[] inputByteArray = Convert.FromBase64String(decryptString);
    DESCryptoServiceProvider DCSP = new DESCryptoServiceProvider();

    MemoryStream mStream = new MemoryStream();
    CryptoStream cStream = new CryptoStream(mStream, DCSP.CreateDecryptor(rgbKey, rgbIV), CryptoStreamMode.Write);
    cStream.Write(inputByteArray, 0, inputByteArray.Length);
    cStream.FlushFinalBlock();
    return Encoding.UTF8.GetString(mStream.ToArray());
   }
   catch
   {
    return "";
   }

  }

}