DES tähistab Data Encryption Standardit, st andmete krüpteerimise standardit, mis on plokkalgoritm, mis kasutab võtmekrüpteerimist. Seda nimetas USA föderaalvalitsuse Rahvuslik Standardibüroo 1976. aastal Föderaalse Andmetöötluse Standardiks (FIPS) ning mis on sellest ajast laialdaselt levinud rahvusvaheliselt. - 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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