Introduction to the MD5 encryption function of DES encryption and decryption in ASP.NET

This article mainly introduces the example code of DES encryption and decryption MD5 encryption helper class in ASP.NET. It is very good and has reference value. Friends in need can refer to it

public class TrialHelper
  {    //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 EncryptDES( string encryptString, string encryptKey = "" )
    {
      try
      {
        if (string.IsNullOrEmpty(encryptKey) || encryptKey.Length < 8)
        {
          encryptKey = "winform01";
        }
        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());
      }
      catch
      {
        return encryptString;
      }
    }
    /// <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 DecryptDES( string decryptString, string decryptKey = "" )
    {
      try
      {
        if (string.IsNullOrEmpty(decryptKey) || decryptKey.Length < 8)
        {
          decryptKey = "winform01";
        }
        byte[] rgbKey = Encoding.UTF8.GetBytes(decryptKey.Substring(0, 8));
        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 decryptString;
      }
    }
    /// <summary>
    /// MD5数据加密
    /// </summary>
    /// <param name="sDataIn">加密字段</param>
    /// <returns>加密后的字符串</returns>
    public static string GetMD5( string sDataIn )
    {
      System.Security.Cryptography.MD5CryptoServiceProvider md5 = new System.Security.Cryptography.MD5CryptoServiceProvider();
      byte[] bytValue, bytHash;
      bytValue = System.Text.Encoding.UTF8.GetBytes(sDataIn);
      bytHash = md5.ComputeHash(bytValue);
      md5.Clear();
      string sTemp = "";
      for (int i = 0; i < bytHash.Length; i++)
      {
        sTemp += bytHash[i].ToString("x").PadLeft(2, &#39;0&#39;);
      }
      return sTemp;
    }
  }

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