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N21DTONEBKFW21/StringOperation.cs[7K，2009-6-12 11:48:38]，
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1
using System;
2using System.Text;
3using System.Security;
4using System.Web.Security;
5
6namespace StringOperation
7
...{
8
/**//// <summary>
9
/// StringOperation 的摘要说明。
10
/// </summary>
11 public class StringOperation
12 ...{
13 public StringOperation()
14 ...{
15 //
16 // TODO: 在此处添加构造函数逻辑
17 //
18 }
19 /**//// <summary>
20 /// 转换特殊字符
21 /// </summary>
22 /// <param name="str">待转换的字符</param>
23 /// <returns></returns>
24 public static string Encode(string str)
25 ...{
26 str = str.Replace("&","&");
27 str = str.Replace("'","''");
28 str = str.Replace("\"",""");
29 str = str.Replace(" "," ");
30 str = str.Replace("<","<");
31 str = str.Replace(">",">");
32 str = str.Replace("\n","<br>");
33 return str;
34 }
35
36 /**//// <summary>
37 /// decode
38 /// </summary>
39 /// <param name="str">string</param>
40 /// <returns></returns>
41 public static string Decode(string str)
42 ...{
43 str = str.Replace("<br>","\n");
44 str = str.Replace(">",">");
45 str = str.Replace("<","<");
46 str = str.Replace(" "," ");
47 str = str.Replace(""","\"");
48 return str;
49 }
50
51 /**//// <summary>
52 /// encrypting string
53 /// </summary>
54 /// <returns></returns>
55 public static string Encrypt(string Password)
56 ...{
57 string str = "";
58 FormsAuthenticationTicket ticket = new System.Web.Security.FormsAuthenticationTicket(Password,true,2);
59 str = FormsAuthentication.Encrypt(ticket).ToString();
60 return str;
61 }
62
63 /**//// <summary>
64 /// encrypting string
65 /// </summary>
66 /// <param name="Password">encrypting string</param>
67 /// <param name="Format">format,0 is SHA1,1 is MD5</param>
68 /// <returns></returns>
69 public static string Encrypt(string Password,int Format)
70 ...{
71 string str = "";
72 switch(Format)
73 ...{
74 case 0:
75 str = FormsAuthentication.HashPasswordForStoringInConfigFile(Password,"SHA1");
76 break;
77 case 1:
78 str = FormsAuthentication.HashPasswordForStoringInConfigFile(Password,"MD5");
79 break;
80 }
81 return str;
82 }
83
84 /**//// <summary>
85 /// decrypt string
86 /// </summary>
87 /// <param name="Passowrd">encrypted string</param>
88 /// <returns></returns>
89 public static string Decrypt(string Passowrd)
90 ...{
91 string str="";
92 str= FormsAuthentication.Decrypt(Passowrd).Name.ToString();
93 return str;
94 }
95
96 /**//// <summary>
97 /// Encrypt Cookie
98 /// </summary>
99 /// <param name="str">Target cookie string</param>
100 /// <returns></returns>
101 public static string EncryptCookie(string strCookie,int type)
102 ...{
103 string str=En(strCookie,type);
104 StringBuilder sb = new StringBuilder();
105 foreach(char a in str)
106 ...{
107 sb.Append(Convert.ToString(a,16).PadLeft(4,'0'));
108 }
109 return sb.ToString();
110 }
111
112 /**//// <summary>
113 /// Decrypt Cookie
114 /// </summary>
115 /// <param name="str">Target cookie string</param>
116 /// <returns></returns>
117 public static string DecryptCookie(string strCookie,int type)
118 ...{
119 StringBuilder sb = new StringBuilder();
120 string [] strarr = new String[255];
121 int i,j,count=strCookie.Length/4;
122 string strTmp;
123
124 for(i=0;i<count;i++)
125 ...{
126 for(j=0;j<4;j++)
127 ...{
128 sb.Append(strCookie.Substring(i*4+j,1));
129 }
130 strarr[i] = sb.ToString();
131 sb.Remove(0,sb.Length);
132 }
133
134 for(i=0;i<count;i++)
135 ...{
136 strTmp = uint.Parse(strarr[i],System.Globalization.NumberStyles.AllowHexSpecifier).ToString("D");
137 char ch = (char)uint.Parse(strTmp);
138 sb.Append(ch);
139 }
140
141 return De(sb.ToString(),type);
142 }
143
144
145 private static string En(string strCookie,int type)
146 ...{
147 string str;
148 if(type % 2==0)
149 ...{
150 str = Transform1(strCookie);
151 }
152 else
153 ...{
154 str = Transform3(strCookie);
155 }
156
157 str = Transform2(strCookie);
158 return str;
159 }
160
161 private static string De(string strCookie,int type)
162 ...{
163 string str;
164 if(type % 2==0)
165 ...{
166 str = DeTransform1(strCookie);
167 }
168 else
169 ...{
170 str = DeTransform3(strCookie);
171 }
172
173 str = Transform2(strCookie);
174 return str;
175 }
176
177
178 /**//// <summary>
179 /// methods 1
180 /// </summary>
181 /// <param name="str">string</param>
182 /// <returns>decrypted string</returns>
183 public static string DeTransform1(string str)
184 ...{
185 int i=0;
186 StringBuilder sb = new StringBuilder();
187
188 foreach(char a in str)
189 ...{
190 switch(i % 6)
191 ...{
192 case 0:
193 sb.Append((char)(a-1));
194 break;
195 case 1:
196 sb.Append((char)(a-5));
197 break;
198 case 2:
199 sb.Append((char)(a-7));
200 break;
201 case 3:
202 sb.Append((char)(a-2));
203 break;
204 case 4:
205 sb.Append((char)(a-4));
206 break;
207 case 5:
208 sb.Append((char)(a-9));
209 break;
210 }
211 i++;
212 }
213
214 return sb.ToString();
215 }
216
217 /**//// <summary>
218 /// method1
219 /// </summary>
220 /// <param name="str">string</param>
221 /// <returns>encrypted string</returns>
222 public static string Transform1(string str)
223 ...{
224 int i=0;
225 StringBuilder sb = new StringBuilder();
226
227 foreach(char a in str)
228 ...{
229 switch(i % 6)
230 ...{
231 case 0:
232 sb.Append((char)(a+1));
233 break;
234 case 1:
235 sb.Append((char)(a+5));
236 break;
237 case 2:
238 sb.Append((char)(a+7));
239 break;
240 case 3:
241 sb.Append((char)(a+2));
242 break;
243 case 4:
244 sb.Append((char)(a+4));
245 break;
246 case 5:
247 sb.Append((char)(a+9));
248 break;
249 }
250 i++;
251 }
252
253 return sb.ToString();
254 }
255
256 /**//// <summary>
257 /// method1
258 /// </summary>
259 /// <param name="str">string</param>
260 /// <returns>encrypted string</returns>
261 public static string Transform2(string str)
262 ...{
263 uint j=0;
264 StringBuilder sb = new StringBuilder();
265
266 str=Reverse(str);
267 foreach(char a in str)
268 ...{
269 j=a;
270 if(j>255)
271 ...{
272 j=(uint)((a>>8) + ((a&0x0ff)<<8));
273 }
274 else
275 ...{
276 j=(uint)((a>>4) + ((a&0x0f)<<4));
277 }
278 sb.Append((char)j);
279 }
280
281 return sb.ToString();
282 }
283
284 /**//// <summary>
285 /// methods 1
286 /// </summary>
287 /// <param name="str">string</param>
288 /// <returns>decrypted string</returns>
289 public static string DeTransform3(string str)
290 ...{
291 int i=0;
292 StringBuilder sb = new StringBuilder();
293
294 foreach(char a in str)
295 ...{
296 switch(i % 6)
297 ...{
298 case 0:
299 sb.Append((char)(a-3));
300 break;
301 case 1:
302 sb.Append((char)(a-6));
303 break;
304 case 2:
305 sb.Append((char)(a-8));
306 break;
307 case 3:
308 sb.Append((char)(a-7));
309 break;
310 case 4:
311 sb.Append((char)(a-5));
312 break;
313 case 5:
314 sb.Append((char)(a-2));
315 break;
316 }
317 i++;
318 }
319
320 return sb.ToString();
321 }
322
323 /**//// <summary>
324 /// method1
325 /// </summary>
326 /// <param name="str">string</param>
327 /// <returns>encrypted string</returns>
328 public static string Transform3(string str)
329 ...{
330 int i=0;
331 StringBuilder sb = new StringBuilder();
332
333 foreach(char a in str)
334 ...{
335 switch(i % 6)
336 ...{
337 case 0:
338 sb.Append((char)(a+3));
339 break;
340 case 1:
341 sb.Append((char)(a+6));
342 break;
343 case 2:
344 sb.Append((char)(a+8));
345 break;
346 case 3:
347 sb.Append((char)(a+7));
348 break;
349 case 4:
350 sb.Append((char)(a+5));
351 break;
352 case 5:
353 sb.Append((char)(a+2));
354 break;
355 }
356 i++;
357 }
358
359 return sb.ToString();
360 }
361
362 /**//// <summary>
363 /// 将指定的字符反过来显示
364 /// </summary>
365 /// <param name="str">待反转的字符</param>
366 /// <returns>反转后的字符</returns>
367 public static string Reverse(string str)
368 ...{
369 int i;
370 StringBuilder sb = new StringBuilder();
371
372 for(i=str.Length-1;i>=0;i--)
373 ...{
374 sb.Append(str[i]);
375 }
376
377 return sb.ToString();
378 }
379 }
380
}
381
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