DES tarkoittaa Data Encryption Standardia, eli Data Encryption Standardia, joka on lohkoalgoritmi, joka käyttää avainsalausta. Se tunnistettiin Federal Data Processing Standardiksi (FIPS) Yhdysvaltain liittovaltion kansallisen standarditoimiston toimesta vuonna 1976, ja on sittemmin ollut laajasti levinnyt kansainvälisesti. - using System;
- using System.Collections.Generic;
- using System.Linq;
- using System.Web;
- using System.Security.Cryptography;
- using System.Text;
- namespace TestWeb
- {
- public class DESEncrypt
- {
- #region ========加密========
- /// <summary>
- /// 加密
- /// </summary>
- /// <param name="Text"></param>
- /// <returns></returns>
- public static string Encrypt(string Text)
- {
- return Encrypt(Text, "Test");
- }
- /// <summary>
- /// 加密数据
- /// </summary>
- /// <param name="Text"></param>
- /// <param name="sKey"></param>
- /// <returns></returns>
- public static string Encrypt(string Text, string sKey)
- {
- DESCryptoServiceProvider des = new DESCryptoServiceProvider();
- byte[] inputByteArray;
- inputByteArray = Encoding.Default.GetBytes(Text);
- des.Key = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8));
- des.IV = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8));
- System.IO.MemoryStream ms = new System.IO.MemoryStream();
- CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write);
- cs.Write(inputByteArray, 0, inputByteArray.Length);
- cs.FlushFinalBlock();
- StringBuilder ret = new StringBuilder();
- foreach (byte b in ms.ToArray())
- {
- ret.AppendFormat("{0:X2}", b);
- }
- return ret.ToString();
- }
- #endregion
- #region ========解密========
- /// <summary>
- /// 解密
- /// </summary>
- /// <param name="Text"></param>
- /// <returns></returns>
- public static string Decrypt(string Text)
- {
- return Decrypt(Text, "Test");
- }
- /// <summary>
- /// 解密数据
- /// </summary>
- /// <param name="Text"></param>
- /// <param name="sKey"></param>
- /// <returns></returns>
- public static string Decrypt(string Text, string sKey)
- {
- DESCryptoServiceProvider des = new DESCryptoServiceProvider();
- int len;
- len = Text.Length / 2;
- byte[] inputByteArray = new byte[len];
- int x, i;
- for (x = 0; x < len; x++)
- {
- i = Convert.ToInt32(Text.Substring(x * 2, 2), 16);
- inputByteArray[x] = (byte)i;
- }
- des.Key = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8));
- des.IV = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8));
- System.IO.MemoryStream ms = new System.IO.MemoryStream();
- CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write);
- cs.Write(inputByteArray, 0, inputByteArray.Length);
- cs.FlushFinalBlock();
- return Encoding.Default.GetString(ms.ToArray());
- }
- #endregion
- }
- }
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