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[Source] The source code is encrypted with DES for the C# program password

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Posted on 6/8/2015 9:31:47 AM | | |
DES stands for Data Encryption Standard, that is, data encryption standard, which is a block algorithm that uses key encryption, which was identified as the Federal Data Processing Standard (FIPS) by the National Bureau of Standards of the U.S. federal government in 1976, and has since been widely circulated internationally.
  1. using System;
  2. using System.Collections.Generic;
  3. using System.Linq;
  4. using System.Web;
  5. using System.Security.Cryptography;
  6. using System.Text;

  8. namespace TestWeb
  9. {
  10.     public class DESEncrypt
  11.     {
  12.         #region ========加密========

  14.         /// <summary>
  15.         /// 加密
  16.         /// </summary>
  17.         /// <param name="Text"></param>
  18.         /// <returns></returns>
  19.         public static string Encrypt(string Text)
  20.         {
  21.             return Encrypt(Text, "Test");
  22.         }
  23.         /// <summary>
  24.         /// 加密数据
  25.         /// </summary>
  26.         /// <param name="Text"></param>
  27.         /// <param name="sKey"></param>
  28.         /// <returns></returns>
  29.         public static string Encrypt(string Text, string sKey)
  30.         {
  31.             DESCryptoServiceProvider des = new DESCryptoServiceProvider();
  32.             byte[] inputByteArray;
  33.             inputByteArray = Encoding.Default.GetBytes(Text);
  34.             des.Key = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8));
  35.             des.IV = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8));
  36.             System.IO.MemoryStream ms = new System.IO.MemoryStream();
  37.             CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write);
  38.             cs.Write(inputByteArray, 0, inputByteArray.Length);
  39.             cs.FlushFinalBlock();
  40.             StringBuilder ret = new StringBuilder();
  41.             foreach (byte b in ms.ToArray())
  42.             {
  43.                 ret.AppendFormat("{0:X2}", b);
  44.             }
  45.             return ret.ToString();
  46.         }

  48.         #endregion
  49.         #region ========解密========

  51.         /// <summary>
  52.         /// 解密
  53.         /// </summary>
  54.         /// <param name="Text"></param>
  55.         /// <returns></returns>
  56.         public static string Decrypt(string Text)
  57.         {
  58.             return Decrypt(Text, "Test");
  59.         }
  60.         /// <summary>
  61.         /// 解密数据
  62.         /// </summary>
  63.         /// <param name="Text"></param>
  64.         /// <param name="sKey"></param>
  65.         /// <returns></returns>
  66.         public static string Decrypt(string Text, string sKey)
  67.         {
  68.             DESCryptoServiceProvider des = new DESCryptoServiceProvider();
  69.             int len;
  70.             len = Text.Length / 2;
  71.             byte[] inputByteArray = new byte[len];
  72.             int x, i;
  73.             for (x = 0; x < len; x++)
  74.             {
  75.                 i = Convert.ToInt32(Text.Substring(x * 2, 2), 16);
  76.                 inputByteArray[x] = (byte)i;
  77.             }
  78.             des.Key = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8));
  79.             des.IV = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8));
  80.             System.IO.MemoryStream ms = new System.IO.MemoryStream();
  81.             CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write);
  82.             cs.Write(inputByteArray, 0, inputByteArray.Length);
  83.             cs.FlushFinalBlock();
  84.             return Encoding.Default.GetString(ms.ToArray());
  85.         }

  87.         #endregion
  88.     }
  89. }
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Posted on 8/1/2017 6:48:32 AM |
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