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DES

Posted on 2017-08-21 22:33  清浅ヾ  阅读(137)  评论(0)  编辑  收藏  举报 
 1 using System;
 2 using System.Collections.Generic;
 3 using System.IO;
 4 using System.Linq;
 5 using System.Security.Cryptography;
 6 using System.Text;
 7 using System.Threading.Tasks;
 8 
 9 namespace MyEncrypt
10 {
11     /// <summary>
12     /// DES AES Blowfish
13     ///  对称加密算法的优点是速度快，
14     ///  缺点是密钥管理不方便，要求共享密钥。
15     /// 可逆对称加密  密钥长度8
16     /// </summary>
17     public class DesEncrypt
18     {
19         private static byte[] _rgbKey = ASCIIEncoding.ASCII.GetBytes(Constant.DesKey.Substring(0, 8));
20         private static byte[] _rgbIV = ASCIIEncoding.ASCII.GetBytes(Constant.DesKey.Insert(0, "w").Substring(0, 8));
21 
22         /// <summary>
23         /// DES 加密
24         /// </summary>
25         /// <param name="text">需要加密的值</param>
26         /// <returns>加密后的结果</returns>
27         public static string Encrypt(string text)
28         {
29             DESCryptoServiceProvider dsp = new DESCryptoServiceProvider();
30             using (MemoryStream memStream = new MemoryStream())
31             {
32                 CryptoStream crypStream = new CryptoStream(memStream, dsp.CreateEncryptor(_rgbKey, _rgbIV), CryptoStreamMode.Write);
33                 StreamWriter sWriter = new StreamWriter(crypStream);
34                 sWriter.Write(text);
35                 sWriter.Flush();
36                 crypStream.FlushFinalBlock();
37                 memStream.Flush();
38                 return Convert.ToBase64String(memStream.GetBuffer(), 0, (int)memStream.Length);
39             }
40         }
41 
42         /// <summary>
43         /// DES解密
44         /// </summary>
45         /// <param name="encryptText"></param>
46         /// <returns>解密后的结果</returns>
47         public static string Decrypt(string encryptText)
48         {
49             DESCryptoServiceProvider dsp = new DESCryptoServiceProvider();
50             byte[] buffer = Convert.FromBase64String(encryptText);
51 
52             using (MemoryStream memStream = new MemoryStream())
53             {
54                 CryptoStream crypStream = new CryptoStream(memStream, dsp.CreateDecryptor(_rgbKey, _rgbIV), CryptoStreamMode.Write);
55                 crypStream.Write(buffer, 0, buffer.Length);
56                 crypStream.FlushFinalBlock();
57                 return ASCIIEncoding.UTF8.GetString(memStream.ToArray());
58             }
59         }
60     }
61 }