2007年12月20日
这个字符串加密解密类是广大程序员必不可少的[静态类]
1
using System;
2using System.Text;
3using System.Security.Cryptography;
4using System.IO;
5
6
7
8//默认密钥向量
9
private static byte[] Keys = 
{ 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };
10/**//**//**//// <summary>
11
/// DES加密字符串
12/// </summary>
13/// <param name="encryptString">待加密的字符串</param>
14/// <param name="encryptKey">加密密钥,要求为8位</param>
15
/// <returns>加密成功返回加密后的字符串，失败返回源串</returns>
16public static string EncryptDES(string encryptString, string encryptKey)
17{
18 try
19
{
20 byte[] rgbKey = Encoding.UTF8.GetBytes(encryptKey.Substring(0, 8));
21 byte[] rgbIV = Keys;
22 byte[] inputByteArray = Encoding.UTF8.GetBytes(encryptString);
23 DESCryptoServiceProvider dCSP = new DESCryptoServiceProvider();
24 MemoryStream mStream = new MemoryStream();
25 CryptoStream cStream = new CryptoStream(mStream, dCSP.CreateEncryptor(rgbKey, rgbIV), CryptoStreamMode.Write);
26 cStream.Write(inputByteArray, 0, inputByteArray.Length);
27 cStream.FlushFinalBlock();
28 return Convert.ToBase64String(mStream.ToArray());
29
}
30 catch
31 {
32 return encryptString;
33 }
34}
35
36/**//**//**//// <summary>
37/// DES解密字符串
38/// </summary>
39/// <param name="decryptString">待解密的字符串</param>
40/// <param name="decryptKey">解密密钥,要求为8位,和加密密钥相同</param>
41/// <returns>解密成功返回解密后的字符串，失败返源串</returns>
42public static string DecryptDES(string decryptString, string decryptKey)
43{
44 try
45 {
46 byte[] rgbKey = Encoding.UTF8.GetBytes(decryptKey);
47 byte[] rgbIV = Keys;
48 byte[] inputByteArray = Convert.FromBase64String(decryptString);
49 DESCryptoServiceProvider DCSP = new DESCryptoServiceProvider();
50 MemoryStream mStream = new MemoryStream();
51 CryptoStream cStream = new CryptoStream(mStream, DCSP.CreateDecryptor(rgbKey, rgbIV), CryptoStreamMode.Write);
52 cStream.Write(inputByteArray, 0, inputByteArray.Length);
53 cStream.FlushFinalBlock();
54 return Encoding.UTF8.GetString(mStream.ToArray());
55 }
56 catch
57 {
58 return decryptString;
59 }
60}
61
posted @
2007-12-20 11:15 痞子再 阅读(1059) |
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大家看到这句的时候,就应该知道了
top 100 是取最前面的100条记录
order by newid() 的作用是为了产生随机数据集
posted @
2007-12-20 10:52 痞子再 阅读(116) |
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