C#DES加密和解密

1. using System;  
2. using System.IO;  
3. using System.Text;  
4. using System.Globalization;  
5. using System.Collections.Generic;  
6. using System.Security.Cryptography;  
7.   
8. namespace EncryptionTest  
9. {  
10.     class Program  
11.     {  
12.         static void Main(string[] args)  
13.         {  
14.             Program pr = new Program();  
15.             string key = pr.GenerateKey();  
16.   
17.             string s1 = "测试字符串";  
18.             string s2 = pr.EncryptString(s1,key);  
19.             string s3 = pr.DecryptString(s2,key);  
20.             Console.WriteLine("原字符串:[{0}]",s1);  
21.             Console.WriteLine("加密后:[{0}]", s2);  
22.             Console.WriteLine("解密后：[{0}]", s3);  
23.   
24.         }  
25.   
26.         /// <summary>  
27.         /// 创建Key  
28.         /// </summary>  
29.         /// <returns></returns>  
30.         public string GenerateKey()  
31.         {  
32.             DESCryptoServiceProvider desCrypto = (DESCryptoServiceProvider)DESCryptoServiceProvider.Create();  
33.             return ASCIIEncoding.ASCII.GetString(desCrypto.Key);  
34.         }  
35.         /// <summary>  
36.         /// 加密字符串  
37.         /// </summary>  
38.         /// <param name="sinputString"></param>  
39.         /// <param name="Skey"></param>  
40.         /// <returns></returns>  
41.         public string EncryptString(string sinputString, string Skey)  
42.         {  
43.             byte[] data = Encoding.UTF8.GetBytes(sinputString);  
44.             DESCryptoServiceProvider DES = new DESCryptoServiceProvider();  
45.             DES.Key = ASCIIEncoding.ASCII.GetBytes(Skey);  
46.             DES.IV = ASCIIEncoding.ASCII.GetBytes(Skey);  
47.             ICryptoTransform desEncrypt = DES.CreateEncryptor();  
48.             byte[] result = desEncrypt.TransformFinalBlock(data, 0, data.Length);  
49.             return BitConverter.ToString(result);  
50.         }  
51.         /// <summary>  
52.         /// 解密字符串  
53.         /// </summary>  
54.         /// <param name="sinputString"></param>  
55.         /// <param name="sKey"></param>  
56.         /// <returns></returns>  
57.         public string DecryptString(string sinputString, string sKey)  
58.         {  
59.             string[] sinput = sinputString.Split("-".ToCharArray());  
60.             byte[] data = new byte[sinput.Length];  
61.             for (int i = 0; i < sinput.Length; i++)  
62.             {  
63.                 data[i] = byte.Parse(sinput[i], NumberStyles.HexNumber);  
64.             }  
65.             DESCryptoServiceProvider DES = new DESCryptoServiceProvider();  
66.             DES.Key = ASCIIEncoding.ASCII.GetBytes(sKey);  
67.             DES.IV = ASCIIEncoding.ASCII.GetBytes(sKey);  
68.             ICryptoTransform desencrypt = DES.CreateDecryptor();  
69.             byte[] result = desencrypt.TransformFinalBlock(data, 0, data.Length);  
70.             return Encoding.UTF8.GetString(result);  
71.         }  
72.   
73.         /// <summary>  
74.         /// DES加密  
75.         /// </summary>  
76.         /// <param name="pToEncrypt"></param>  
77.         /// <param name="sKey"></param>  
78.         /// <returns></returns>  
79.         public string MD5Encrypt(string pToEncrypt, string sKey)  
80.         {  
81.             DESCryptoServiceProvider des = new DESCryptoServiceProvider();  
82.             byte[] inputByteArray = Encoding.Default.GetBytes(pToEncrypt);  
83.             des.Key = ASCIIEncoding.ASCII.GetBytes(sKey);  
84.             des.IV = ASCIIEncoding.ASCII.GetBytes(sKey);  
85.             MemoryStream ms = new MemoryStream();  
86.             CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write);  
87.             cs.Write(inputByteArray, 0, inputByteArray.Length);  
88.             cs.FlushFinalBlock();  
89.             StringBuilder ret = new StringBuilder();  
90.             foreach (byte b in ms.ToArray())  
91.             {  
92.                 ret.AppendFormat("{0:X2}", b);  
93.             }  
94.             ret.ToString();  
95.             return ret.ToString();  
96.         }  
97.         /// <summary>  
98.         /// DES解密  
99.         /// </summary>  
100.         /// <param name="pToDecrypt"></param>  
101.         /// <param name="sKey"></param>  
102.         /// <returns></returns>  
103.         public string MD5Decrypt(string pToDecrypt, string sKey)  
104.         {  
105.             DESCryptoServiceProvider des = new DESCryptoServiceProvider();  
106.             byte[] inputByteArray = new byte[pToDecrypt.Length / 2];  
107.             for (int x = 0; x < pToDecrypt.Length / 2; x++)  
108.             {  
109.                 int i = (Convert.ToInt32(pToDecrypt.Substring(x * 2, 2), 16));  
110.                 inputByteArray[x] = (byte)i;  
111.             }  
112.             des.Key = ASCIIEncoding.ASCII.GetBytes(sKey);  
113.             des.IV = ASCIIEncoding.ASCII.GetBytes(sKey);  
114.             MemoryStream ms = new MemoryStream();  
115.             CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write);  
116.             cs.Write(inputByteArray, 0, inputByteArray.Length);  
117.             cs.FlushFinalBlock();  
118.             StringBuilder ret = new StringBuilder();  
119.             return System.Text.Encoding.Default.GetString(ms.ToArray());  
120.         }  
121.     }  
122.   
123.   
124. }