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.Web;
8
9 namespace WebDemo.Until
10 {
11
12 public class EncryptHelper
13 {
14 #region DES对称加密解密
15
16 /// <summary> 加密字符串
17 /// </summary>
18 /// <param name="strText">需被加密的字符串</param>
19 /// <param name="strEncrKey">密钥</param>
20 /// <returns></returns>
21 public static string DesEncrypt(string strText, string strEncrKey)
22 {
23 try
24 {
25 byte[] byKey = null;
26 byte[] IV = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };
27
28 byKey = Encoding.UTF8.GetBytes(strEncrKey.Substring(0, 8));
29 DESCryptoServiceProvider des = new DESCryptoServiceProvider();
30 byte[] inputByteArray = Encoding.UTF8.GetBytes(strText);
31 MemoryStream ms = new MemoryStream();
32 CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(byKey, IV), CryptoStreamMode.Write);
33 cs.Write(inputByteArray, 0, inputByteArray.Length);
34 cs.FlushFinalBlock();
35 return Convert.ToBase64String(ms.ToArray());
36 }
37 catch
38 {
39 return "";
40 }
41 }
42
43 /// <summary> 解密字符串
44 /// </summary>
45 /// <param name="strText">需被解密的字符串</param>
46 /// <param name="sDecrKey">密钥</param>
47 /// <returns></returns>
48 public static string DesDecrypt(string strText, string sDecrKey)
49 {
50 try
51 {
52 byte[] byKey = null;
53 byte[] IV = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };
54 byte[] inputByteArray = new Byte[strText.Length];
55
56 byKey = Encoding.UTF8.GetBytes(sDecrKey.Substring(0, 8));
57 DESCryptoServiceProvider des = new DESCryptoServiceProvider();
58 inputByteArray = Convert.FromBase64String(strText);
59 MemoryStream ms = new MemoryStream();
60 CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(byKey, IV), CryptoStreamMode.Write);
61 cs.Write(inputByteArray, 0, inputByteArray.Length);
62 cs.FlushFinalBlock();
63 Encoding encoding = new UTF8Encoding();
64 return encoding.GetString(ms.ToArray());
65 }
66 catch
67 {
68 return null;
69 }
70 }
71
72 /// <summary> 加密文件
73 ///
74 /// </summary>
75 /// <param name="m_InFilePath">原路径</param>
76 /// <param name="m_OutFilePath">加密后的文件路径</param>
77 /// <param name="strEncrKey">密钥</param>
78 public static void DesEncryptFile(string m_InFilePath, string m_OutFilePath, string strEncrKey)
79 {
80 try
81 {
82 byte[] byKey = null;
83 byte[] IV = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };
84
85 byKey = Encoding.UTF8.GetBytes(strEncrKey.Substring(0, 8));
86 FileStream fin = new FileStream(m_InFilePath, FileMode.Open, FileAccess.Read);
87 FileStream fout = new FileStream(m_OutFilePath, FileMode.OpenOrCreate, FileAccess.Write);
88 fout.SetLength(0);
89 //Create variables to help with read and write.
90 byte[] bin = new byte[100]; //This is intermediate storage for the encryption.
91 long rdlen = 0; //This is the total number of bytes written.
92 long totlen = fin.Length; //This is the total length of the input file.
93 int len; //This is the number of bytes to be written at a time.
94
95 DES des = new DESCryptoServiceProvider();
96 CryptoStream encStream = new CryptoStream(fout, des.CreateEncryptor(byKey, IV), CryptoStreamMode.Write);
97
98 //Read from the input file, then encrypt and write to the output file.
99 while (rdlen < totlen)
100 {
101 len = fin.Read(bin, 0, 100);
102 encStream.Write(bin, 0, len);
103 rdlen = rdlen + len;
104 }
105 encStream.Close();
106 fout.Close();
107 fin.Close();
108 }
109 catch
110 {
111 }
112
113 }
114
115 /// <summary> 解密文件
116 ///
117 /// </summary>
118 /// <param name="m_InFilePath">被解密路径</param>
119 /// <param name="m_OutFilePath">解密后的路径</param>
120 /// <param name="sDecrKey">密钥</param>
121 public static void DesDecryptFile(string m_InFilePath, string m_OutFilePath, string sDecrKey)
122 {
123 try
124 {
125 byte[] byKey = null;
126 byte[] IV = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };
127
128 byKey = Encoding.UTF8.GetBytes(sDecrKey.Substring(0, 8));
129 FileStream fin = new FileStream(m_InFilePath, FileMode.Open, FileAccess.Read);
130 FileStream fout = new FileStream(m_OutFilePath, FileMode.OpenOrCreate, FileAccess.Write);
131 fout.SetLength(0);
132 //Create variables to help with read and write.
133 byte[] bin = new byte[100]; //This is intermediate storage for the encryption.
134 long rdlen = 0; //This is the total number of bytes written.
135 long totlen = fin.Length; //This is the total length of the input file.
136 int len; //This is the number of bytes to be written at a time.
137
138 DES des = new DESCryptoServiceProvider();
139 CryptoStream encStream = new CryptoStream(fout, des.CreateDecryptor(byKey, IV), CryptoStreamMode.Write);
140
141 //Read from the input file, then encrypt and write to the output file.
142 while (rdlen < totlen)
143 {
144 len = fin.Read(bin, 0, 100);
145 encStream.Write(bin, 0, len);
146 rdlen = rdlen + len;
147 }
148 encStream.Close();
149 fout.Close();
150 fin.Close();
151 }
152 catch
153 {
154 }
155 }
156 #endregion
157
158 #region 3DES对称加密解密
159 /// <summary>
160 ///3DES加密
161 /// </summary>
162 /// <param name="originalValue">加密数据</param>
163 /// <param name="key">24位字符的密钥字符串</param>
164 /// <param name="IV">8位字符的初始化向量字符串</param>
165 /// <returns></returns>
166 public static string DESEncrypt(string originalValue, string key, string IV)
167 {
168 SymmetricAlgorithm sa = new TripleDESCryptoServiceProvider();
169 sa.Mode = CipherMode.CBC;
170 sa.Padding = PaddingMode.PKCS7;
171 sa.Key = Encoding.UTF8.GetBytes(key);
172 sa.IV = Encoding.UTF8.GetBytes(IV);
173 ICryptoTransform ct = sa.CreateEncryptor();
174 byte[] byt = Encoding.UTF8.GetBytes(originalValue);
175 MemoryStream ms = new MemoryStream();
176 CryptoStream cs = new CryptoStream(ms, ct, CryptoStreamMode.Write);
177 cs.Write(byt, 0, byt.Length);
178 cs.FlushFinalBlock();
179 cs.Close();
180 return Convert.ToBase64String(ms.ToArray());
181 }
182 /// <summary>
183 /// 3DES解密
184 /// </summary>
185 /// <param name="data">解密数据</param>
186 /// <param name="key">24位字符的密钥字符串(需要和加密时相同)</param>
187 /// <param name="iv">8位字符的初始化向量字符串(需要和加密时相同)</param>
188 /// <returns></returns>
189 public static string DESDecrypst(string data, string key, string IV)
190 {
191 SymmetricAlgorithm mCSP = new TripleDESCryptoServiceProvider();
192 mCSP.Mode = CipherMode.CBC;
193 mCSP.Padding = PaddingMode.PKCS7;
194 mCSP.Key = Encoding.UTF8.GetBytes(key);
195 mCSP.IV = Encoding.UTF8.GetBytes(IV);
196 ICryptoTransform ct = mCSP.CreateDecryptor(mCSP.Key, mCSP.IV);
197 byte[] byt = Convert.FromBase64String(data);
198 MemoryStream ms = new MemoryStream();
199 CryptoStream cs = new CryptoStream(ms, ct, CryptoStreamMode.Write);
200 cs.Write(byt, 0, byt.Length);
201 cs.FlushFinalBlock();
202 cs.Close();
203 return Encoding.UTF8.GetString(ms.ToArray());
204 }
205 #endregion
206
207 #region AES RijndaelManaged加密解密
208
209 private static readonly string Default_AES_Key = "@#kim123";
210 private static byte[] Keys = { 0x41, 0x72, 0x65, 0x79, 0x6F, 0x75, 0x6D, 0x79,
211 0x53,0x6E, 0x6F, 0x77, 0x6D, 0x61, 0x6E, 0x3F };
212 public static string AES_Encrypt(string encryptString)
213 {
214 return AES_Encrypt(encryptString, Default_AES_Key);
215 }
216
217 public static string AES_Decrypt(string decryptString)
218 {
219 return AES_Decrypt(decryptString, Default_AES_Key);
220 }
221
222 #region AES(CBC)有向量（IV）
223 /// <summary>对称加密算法AES RijndaelManaged加密(RijndaelManaged（AES）算法是块式加密算法)
224 ///
225 /// </summary>
226 /// <param name="encryptString">待加密字符串</param>
227 /// <param name="encryptKey">加密密钥，须半角字符</param>
228 /// <returns>加密结果字符串</returns>
229 public static string AES_Encrypt(string encryptString, string encryptKey)
230 {
231 encryptKey = GetSubString(encryptKey, 32, "");
232 encryptKey = encryptKey.PadRight(32, ' ');
233
234 RijndaelManaged rijndaelProvider = new RijndaelManaged();
235 rijndaelProvider.Key = Encoding.UTF8.GetBytes(encryptKey.Substring(0, 32));
236 rijndaelProvider.IV = Keys;
237 ICryptoTransform rijndaelEncrypt = rijndaelProvider.CreateEncryptor();
238
239 byte[] inputData = Encoding.UTF8.GetBytes(encryptString);
240 byte[] encryptedData = rijndaelEncrypt.TransformFinalBlock(inputData, 0, inputData.Length);
241
242 return Convert.ToBase64String(encryptedData);
243 }
244
245 /// <summary> 对称加密算法AES RijndaelManaged解密字符串
246 ///
247 /// </summary>
248 /// <param name="decryptString">待解密的字符串</param>
249 /// <param name="decryptKey">解密密钥,和加密密钥相同</param>
250 /// <returns>解密成功返回解密后的字符串,失败返回空</returns>
251 public static string AES_Decrypt(string decryptString, string decryptKey)
252 {
253 try
254 {
255 decryptKey = GetSubString(decryptKey, 32, "");
256 decryptKey = decryptKey.PadRight(32, ' ');
257
258 RijndaelManaged rijndaelProvider = new RijndaelManaged();
259 rijndaelProvider.Key = Encoding.UTF8.GetBytes(decryptKey);
260 rijndaelProvider.IV = Keys;
261 ICryptoTransform rijndaelDecrypt = rijndaelProvider.CreateDecryptor();
262
263 byte[] inputData = Convert.FromBase64String(decryptString);
264 byte[] decryptedData = rijndaelDecrypt.TransformFinalBlock(inputData, 0, inputData.Length);
265
266 return Encoding.UTF8.GetString(decryptedData);
267 }
268 catch
269 {
270 return string.Empty;
271 }
272 }
273 #endregion
274
275 #region AES(ECB)无向量（IV）
276 /// <summary>
277 /// AES加密(无向量)
278 /// </summary>
279 /// <param name="plainBytes">被加密的明文</param>
280 /// <param name="key">密钥 32 </param>
281 /// <returns>密文</returns>
282 public static string AESEncryptECB(string encryptString, string encryptKey)
283 {
284 try
285 {
286 encryptKey = GetSubString(encryptKey, 32, "");
287 encryptKey = encryptKey.PadRight(32, ' ');
288
289 RijndaelManaged rijndaelProvider = new RijndaelManaged();
290 rijndaelProvider.Key = Encoding.UTF8.GetBytes(encryptKey.Substring(0, 32));
291 rijndaelProvider.Mode = CipherMode.ECB;
292 rijndaelProvider.Padding = PaddingMode.PKCS7;
293 ICryptoTransform rijndaelEncrypt = rijndaelProvider.CreateEncryptor();
294 byte[] inputData = Encoding.UTF8.GetBytes(encryptString);
295 byte[] encryptedData = rijndaelEncrypt.TransformFinalBlock(inputData, 0, inputData.Length);
296 return Convert.ToBase64String(encryptedData);
297 }
298 catch (Exception ex)
299 {
300 return ex.Message;
301 }
302 }
303
304
305 /// <summary>
306 /// AES解密(无向量)
307 /// </summary>
308 /// <param name="decryptString">被加密的明文</param>
309 /// <param name="decryptKey">密钥</param>
310 /// <returns>明文</returns>
311 public static string AESDecryptECB(string decryptString, string decryptKey)
312 {
313 try
314 {
315 decryptKey = GetSubString(decryptKey, 32, "");
316 decryptKey = decryptKey.PadRight(32, ' ');
317
318 RijndaelManaged rijndaelProvider = new RijndaelManaged();
319 rijndaelProvider.Key = Encoding.UTF8.GetBytes(decryptKey.Substring(0, 32));
320 rijndaelProvider.Mode = CipherMode.ECB;
321 rijndaelProvider.Padding = PaddingMode.PKCS7;
322 ICryptoTransform rijndaelDecrypt = rijndaelProvider.CreateDecryptor();
323 byte[] inputData = Convert.FromBase64String(decryptString);
324 byte[] decryptedData = rijndaelDecrypt.TransformFinalBlock(inputData, 0, inputData.Length);
325 return Encoding.UTF8.GetString(decryptedData);
326 }
327 catch (Exception ex)
328 {
329 return ex.Message;
330 }
331 }
332 #endregion
333
334
335 /// <summary>
336 /// 按字节长度(按字节,一个汉字为2个字节)取得某字符串的一部分
337 /// </summary>
338 /// <param name="sourceString">源字符串</param>
339 /// <param name="length">所取字符串字节长度</param>
340 /// <param name="tailString">附加字符串(当字符串不够长时，尾部所添加的字符串，一般为"...")</param>
341 /// <returns>某字符串的一部分</returns>
342 private static string GetSubString(string sourceString, int length, string tailString)
343 {
344 return GetSubString(sourceString, 0, length, tailString);
345 }
346
347 /// <summary>
348 /// 按字节长度(按字节,一个汉字为2个字节)取得某字符串的一部分
349 /// </summary>
350 /// <param name="sourceString">源字符串</param>
351 /// <param name="startIndex">索引位置，以0开始</param>
352 /// <param name="length">所取字符串字节长度</param>
353 /// <param name="tailString">附加字符串(当字符串不够长时，尾部所添加的字符串，一般为"...")</param>
354 /// <returns>某字符串的一部分</returns>
355 private static string GetSubString(string sourceString, int startIndex, int length, string tailString)
356 {
357 string myResult = sourceString;
358
359 //当是日文或韩文时(注:中文的范围:\u4e00 - \u9fa5, 日文在\u0800 - \u4e00, 韩文为\xAC00-\xD7A3)
360 if (System.Text.RegularExpressions.Regex.IsMatch(sourceString, "[\u0800-\u4e00]+") ||
361 System.Text.RegularExpressions.Regex.IsMatch(sourceString, "[\xAC00-\xD7A3]+"))
362 {
363 //当截取的起始位置超出字段串长度时
364 if (startIndex >= sourceString.Length)
365 {
366 return string.Empty;
367 }
368 else
369 {
370 return sourceString.Substring(startIndex,
371 ((length + startIndex) > sourceString.Length) ? (sourceString.Length - startIndex) : length);
372 }
373 }
374
375 //中文字符，如"中国人民abcd123"
376 if (length <= 0)
377 {
378 return string.Empty;
379 }
380 byte[] bytesSource = Encoding.Default.GetBytes(sourceString);
381
382 //当字符串长度大于起始位置
383 if (bytesSource.Length > startIndex)
384 {
385 int endIndex = bytesSource.Length;
386
387 //当要截取的长度在字符串的有效长度范围内
388 if (bytesSource.Length > (startIndex + length))
389 {
390 endIndex = length + startIndex;
391 }
392 else
393 { //当不在有效范围内时,只取到字符串的结尾
394 length = bytesSource.Length - startIndex;
395 tailString = "";
396 }
397
398 int[] anResultFlag = new int[length];
399 int nFlag = 0;
400 //字节大于127为双字节字符
401 for (int i = startIndex; i < endIndex; i++)
402 {
403 if (bytesSource[i] > 127)
404 {
405 nFlag++;
406 if (nFlag == 3)
407 {
408 nFlag = 1;
409 }
410 }
411 else
412 {
413 nFlag = 0;
414 }
415 anResultFlag[i] = nFlag;
416 }
417 //最后一个字节为双字节字符的一半
418 if ((bytesSource[endIndex - 1] > 127) && (anResultFlag[length - 1] == 1))
419 {
420 length = length + 1;
421 }
422
423 byte[] bsResult = new byte[length];
424 Array.Copy(bytesSource, startIndex, bsResult, 0, length);
425 myResult = Encoding.Default.GetString(bsResult);
426 myResult = myResult + tailString;
427
428 return myResult;
429 }
430
431 return string.Empty;
432
433 }
434
435 /// <summary>
436 /// 加密文件流
437 /// </summary>
438 /// <param name="fs"></param>
439 /// <returns></returns>
440 public static CryptoStream AES_EncryptStrream(FileStream fs, string decryptKey)
441 {
442 decryptKey = GetSubString(decryptKey, 32, "");
443 decryptKey = decryptKey.PadRight(32, ' ');
444
445 RijndaelManaged rijndaelProvider = new RijndaelManaged();
446 rijndaelProvider.Key = Encoding.UTF8.GetBytes(decryptKey);
447 rijndaelProvider.IV = Keys;
448
449 ICryptoTransform encrypto = rijndaelProvider.CreateEncryptor();
450 CryptoStream cytptostreamEncr = new CryptoStream(fs, encrypto, CryptoStreamMode.Write);
451 return cytptostreamEncr;
452 }
453
454 /// <summary>
455 /// 解密文件流
456 /// </summary>
457 /// <param name="fs"></param>
458 /// <returns></returns>
459 public static CryptoStream AES_DecryptStream(FileStream fs, string decryptKey)
460 {
461 decryptKey = GetSubString(decryptKey, 32, "");
462 decryptKey = decryptKey.PadRight(32, ' ');
463
464 RijndaelManaged rijndaelProvider = new RijndaelManaged();
465 rijndaelProvider.Key = Encoding.UTF8.GetBytes(decryptKey);
466 rijndaelProvider.IV = Keys;
467 ICryptoTransform Decrypto = rijndaelProvider.CreateDecryptor();
468 CryptoStream cytptostreamDecr = new CryptoStream(fs, Decrypto, CryptoStreamMode.Read);
469 return cytptostreamDecr;
470 }
471
472 /// <summary>
473 /// 对指定文件加密
474 /// </summary>
475 /// <param name="InputFile"></param>
476 /// <param name="OutputFile"></param>
477 /// <returns></returns>
478 public static bool AES_EncryptFile(string InputFile, string OutputFile)
479 {
480 try
481 {
482 string decryptKey = "www.iqidi.com";
483
484 FileStream fr = new FileStream(InputFile, FileMode.Open);
485 FileStream fren = new FileStream(OutputFile, FileMode.Create);
486 CryptoStream Enfr = AES_EncryptStrream(fren, decryptKey);
487 byte[] bytearrayinput = new byte[fr.Length];
488 fr.Read(bytearrayinput, 0, bytearrayinput.Length);
489 Enfr.Write(bytearrayinput, 0, bytearrayinput.Length);
490 Enfr.Close();
491 fr.Close();
492 fren.Close();
493 }
494 catch
495 {
496 //文件异常
497 return false;
498 }
499 return true;
500 }
501
502 /// <summary>
503 /// 对指定的文件解压缩
504 /// </summary>
505 /// <param name="InputFile"></param>
506 /// <param name="OutputFile"></param>
507 /// <returns></returns>
508 public static bool AES_DecryptFile(string InputFile, string OutputFile)
509 {
510 try
511 {
512 string decryptKey = "www.iqidi.com";
513 FileStream fr = new FileStream(InputFile, FileMode.Open);
514 FileStream frde = new FileStream(OutputFile, FileMode.Create);
515 CryptoStream Defr = AES_DecryptStream(fr, decryptKey);
516 byte[] bytearrayoutput = new byte[1024];
517 int m_count = 0;
518
519 do
520 {
521 m_count = Defr.Read(bytearrayoutput, 0, bytearrayoutput.Length);
522 frde.Write(bytearrayoutput, 0, m_count);
523 if (m_count < bytearrayoutput.Length)
524 break;
525 } while (true);
526
527 Defr.Close();
528 fr.Close();
529 frde.Close();
530 }
531 catch
532 {
533 //文件异常
534 return false;
535 }
536 return true;
537 }
538
539 #endregion
540
541 #region RSA加密 解密
542
543 /// <summary>RSA加密
544 ///
545 /// </summary>
546 /// <param name="plaintext">明文</param>
547 /// <param name="publicKey">公钥</param>
548 /// <returns>密文字符串</returns>
549 public static string EncryptByRSA(string plaintext, string publicKey)
550 {
551 try
552 {
553 UnicodeEncoding ByteConverter = new UnicodeEncoding();
554 byte[] dataToEncrypt = ByteConverter.GetBytes(plaintext);
555 using (RSACryptoServiceProvider RSA = new RSACryptoServiceProvider())
556 {
557 RSA.FromXmlString(publicKey);
558 byte[] encryptedData = RSA.Encrypt(dataToEncrypt, false);
559 return Convert.ToBase64String(encryptedData);
560 }
561 }
562 catch (Exception)
563 {
564 return null;
565 }
566
567 }
568
569
570 /// <summary> RSA解密
571 ///
572 /// </summary>
573 /// <param name="ciphertext">密文</param>
574 /// <param name="privateKey">私钥</param>
575 /// <returns>明文字符串</returns>
576 public static string DecryptByRSA(string ciphertext, string privateKey)
577 {
578 try
579 {
580 UnicodeEncoding byteConverter = new UnicodeEncoding();
581 using (RSACryptoServiceProvider RSA = new RSACryptoServiceProvider())
582 {
583 RSA.FromXmlString(privateKey);
584 byte[] encryptedData = Convert.FromBase64String(ciphertext);
585 byte[] decryptedData = RSA.Decrypt(encryptedData, false);
586 return byteConverter.GetString(decryptedData);
587 }
588 }
589 catch (Exception)
590 {
591 return null;
592 }
593
594 }
595
596
597 /// <summary>生成RSA加密 解密的 密钥
598 /// 生成的key就是 方法EncryptByRSA与DecryptByRSA用的key了
599 /// </summary>
600 /// <param name="path">要生成的密钥文件的路径(文件夹)</param>
601 public static void getRSAKey(string path)
602 {
603 RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();
604 string datetimestr = System.DateTime.Now.ToString("yyyyMMddHHmmss");
605 using (StreamWriter writer = new StreamWriter("RSA解密_PrivateKey_" + datetimestr + ".xml")) //这个文件要保密...
606 {
607 writer.WriteLine(rsa.ToXmlString(true));
608 }
609 using (StreamWriter writer = new StreamWriter("RSA加密_PublicKey_" + datetimestr + ".xml"))
610 {
611 writer.WriteLine(rsa.ToXmlString(false));
612 }
613 }
614 #endregion
615
616 #region Base64加密解密
617
618 /// <summary>
619 /// Base64是一種使用64基的位置計數法。它使用2的最大次方來代表僅可列印的ASCII 字元。
620 /// 這使它可用來作為電子郵件的傳輸編碼。在Base64中的變數使用字元A-Z、a-z和0-9 ，
621 /// 這樣共有62個字元，用來作為開始的64個數字，最後兩個用來作為數字的符號在不同的
622 /// 系統中而不同。
623 /// Base64加密
624 /// </summary>
625 /// <param name="str"></param>
626 /// <returns></returns>
627 public static string Base64Encrypt(string str)
628 {
629 byte[] encbuff = System.Text.Encoding.UTF8.GetBytes(str);
630 return Convert.ToBase64String(encbuff);
631 }
632
633 /// <summary>
634 /// Base64解密
635 /// </summary>
636 /// <param name="str"></param>
637 /// <returns></returns>
638 public static string Base64Decrypt(string str)
639 {
640 byte[] decbuff = Convert.FromBase64String(str);
641 return System.Text.Encoding.UTF8.GetString(decbuff);
642 }
643 #endregion
644
645 #region MD5
646 /// <summary>
647
648 /// 获得32位的MD5加密
649 /// </summary>
650 /// <param name="input"></param>
651 /// <returns></returns>
652 public static string GetMD5_32(string input)
653 {
654 MD5 md5 = MD5.Create();
655 byte[] data = md5.ComputeHash(Encoding.Default.GetBytes(input));
656 StringBuilder sb = new StringBuilder();
657 for (int i = 0; i < data.Length; i++)
658 {
659 sb.AppendFormat("{0:X2}", data[i]);
660 }
661 return sb.ToString();
662 }
663
664 /// <summary>
665 /// 获得16位的MD5加密
666 /// </summary>
667 /// <param name="input"></param>
668 /// <returns></returns>
669 public static string GetMD5_16(string input)
670 {
671 return GetMD5_32(input).Substring(8, 16);
672 }
673 /// <summary>
674 /// 获得8位的MD5加密
675 /// </summary>
676 /// <param name="input"></param>
677 /// <returns></returns>
678 public static string GetMD5_8(string input)
679 {
680 return GetMD5_32(input).Substring(8, 8);
681 }
682 /// <summary>
683 /// 获得4位的MD5加密
684 /// </summary>
685 /// <param name="input"></param>
686 /// <returns></returns>
687 public static string GetMD5_4(string input)
688 {
689 return GetMD5_32(input).Substring(8, 4);
690 }
691
692 public static string MD5EncryptHash(String input)
693 {
694 MD5 md5 = new MD5CryptoServiceProvider();
695 //the GetBytes method returns byte array equavalent of a string
696 byte[] res = md5.ComputeHash(Encoding.Default.GetBytes(input), 0, input.Length);
697 char[] temp = new char[res.Length];
698 //copy to a char array which can be passed to a String constructor
699 Array.Copy(res, temp, res.Length);
700 //return the result as a string
701 return new String(temp);
702 }
703 #endregion
704
705 #region MD5签名验证
706
707 /// <summary>
708 /// 对给定文件路径的文件加上标签
709 /// </summary>
710 /// <param name="path">要加密的文件的路径</param>
711 /// <returns>标签的值</returns>
712 public static bool AddMD5(string path)
713 {
714 bool IsNeed = true;
715
716 if (CheckMD5(path)) //已进行MD5处理
717 IsNeed = false;
718
719 try
720 {
721 FileStream fsread = new FileStream(path, FileMode.Open, FileAccess.Read, FileShare.Read);
722 byte[] md5File = new byte[fsread.Length];
723 fsread.Read(md5File, 0, (int)fsread.Length); // 将文件流读取到Buffer中
724 fsread.Close();
725
726 if (IsNeed)
727 {
728 string result = MD5Buffer(md5File, 0, md5File.Length); // 对Buffer中的字节内容算MD5
729 byte[] md5 = System.Text.Encoding.ASCII.GetBytes(result); // 将字符串转换成字节数组以便写人到文件中
730 FileStream fsWrite = new FileStream(path, FileMode.Open, FileAccess.ReadWrite);
731 fsWrite.Write(md5File, 0, md5File.Length); // 将文件，MD5值 重新写入到文件中。
732 fsWrite.Write(md5, 0, md5.Length);
733 fsWrite.Close();
734 }
735 else
736 {
737 FileStream fsWrite = new FileStream(path, FileMode.Open, FileAccess.ReadWrite);
738 fsWrite.Write(md5File, 0, md5File.Length);
739 fsWrite.Close();
740 }
741 }
742 catch
743 {
744 return false;
745 }
746
747 return true;
748 }
749
750 /// <summary>
751 /// 对给定路径的文件进行验证
752 /// </summary>
753 /// <param name="path"></param>
754 /// <returns>是否加了标签或是否标签值与内容值一致</returns>
755 public static bool CheckMD5(string path)
756 {
757 try
758 {
759 FileStream get_file = new FileStream(path, FileMode.Open, FileAccess.Read, FileShare.Read);
760 byte[] md5File = new byte[get_file.Length]; // 读入文件
761 get_file.Read(md5File, 0, (int)get_file.Length);
762 get_file.Close();
763
764 string result = MD5Buffer(md5File, 0, md5File.Length - 32); // 对文件除最后32位以外的字节计算MD5，这个32是因为标签位为32位。
765 string md5 = System.Text.Encoding.ASCII.GetString(md5File, md5File.Length - 32, 32); //读取文件最后32位，其中保存的就是MD5值
766 return result == md5;
767 }
768 catch
769 {
770 return false;
771 }
772 }
773
774 /// <summary>
775 /// 计算文件的MD5值
776 /// </summary>
777 /// <param name="MD5File">MD5签名文件字符数组</param>
778 /// <param name="index">计算起始位置</param>
779 /// <param name="count">计算终止位置</param>
780 /// <returns>计算结果</returns>
781 private static string MD5Buffer(byte[] MD5File, int index, int count)
782 {
783 System.Security.Cryptography.MD5CryptoServiceProvider get_md5 = new System.Security.Cryptography.MD5CryptoServiceProvider();
784 byte[] hash_byte = get_md5.ComputeHash(MD5File, index, count);
785 string result = System.BitConverter.ToString(hash_byte);
786
787 result = result.Replace("-", "");
788 return result;
789 }
790 #endregion
791
792 #region SHA256加密算法
793
794
795 /// <summary>
796 /// SHA256函数
797 /// </summary>
798 /// <param name="str">原始字符串</param>
799 /// <returns>SHA256结果(返回长度为44字节的字符串)</returns>
800 public static string SHA256(string str)
801 {
802 byte[] SHA256Data = Encoding.UTF8.GetBytes(str);
803 SHA256Managed Sha256 = new SHA256Managed();
804 byte[] Result = Sha256.ComputeHash(SHA256Data);
805 return Convert.ToBase64String(Result); //返回长度为44字节的字符串
806 }
807 #endregion
808
809 #region RC4加密 解密
810
811 /// <summary>RC4加密算法
812 /// 返回进过rc4加密过的字符
813 /// </summary>
814 /// <param name="str">被加密的字符</param>
815 /// <param name="ckey">密钥</param>
816 public static string EncryptRC4wq(string str, string ckey)
817 {
818 int[] s = new int[256];
819 for (int i = 0; i < 256; i++)
820 {
821 s[i] = i;
822 }
823 //密钥转数组
824 char[] keys = ckey.ToCharArray();//密钥转字符数组
825 int[] key = new int[keys.Length];
826 for (int i = 0; i < keys.Length; i++)
827 {
828 key[i] = keys[i];
829 }
830 //明文转数组
831 char[] datas = str.ToCharArray();
832 int[] mingwen = new int[datas.Length];
833 for (int i = 0; i < datas.Length; i++)
834 {
835 mingwen[i] = datas[i];
836 }
837
838 //通过循环得到256位的数组(密钥)
839 int j = 0;
840 int k = 0;
841 int length = key.Length;
842 int a;
843 for (int i = 0; i < 256; i++)
844 {
845 a = s[i];
846 j = (j + a + key[k]);
847 if (j >= 256)
848 {
849 j = j % 256;
850 }
851 s[i] = s[j];
852 s[j] = a;
853 if (++k >= length)
854 {
855 k = 0;
856 }
857 }
858 //根据上面的256的密钥数组 和 明文得到密文数组
859 int x = 0, y = 0, a2, b, c;
860 int length2 = mingwen.Length;
861 int[] miwen = new int[length2];
862 for (int i = 0; i < length2; i++)
863 {
864 x = x + 1;
865 x = x % 256;
866 a2 = s[x];
867 y = y + a2;
868 y = y % 256;
869 s[x] = b = s[y];
870 s[y] = a2;
871 c = a2 + b;
872 c = c % 256;
873 miwen[i] = mingwen[i] ^ s[c];
874 }
875 //密文数组转密文字符
876 char[] mi = new char[miwen.Length];
877 for (int i = 0; i < miwen.Length; i++)
878 {
879 mi[i] = (char)miwen[i];
880 }
881 string miwenstr = new string(mi);
882 return miwenstr;
883 }
884
885 /// <summary>RC4解密算法
886 /// 返回进过rc4解密过的字符
887 /// </summary>
888 /// <param name="str">被解密的字符</param>
889 /// <param name="ckey">密钥</param>
890 public static string DecryptRC4wq(string str, string ckey)
891 {
892 int[] s = new int[256];
893 for (int i = 0; i < 256; i++)
894 {
895 s[i] = i;
896 }
897 //密钥转数组
898 char[] keys = ckey.ToCharArray();//密钥转字符数组
899 int[] key = new int[keys.Length];
900 for (int i = 0; i < keys.Length; i++)
901 {
902 key[i] = keys[i];
903 }
904 //密文转数组
905 char[] datas = str.ToCharArray();
906 int[] miwen = new int[datas.Length];
907 for (int i = 0; i < datas.Length; i++)
908 {
909 miwen[i] = datas[i];
910 }
911
912 //通过循环得到256位的数组(密钥)
913 int j = 0;
914 int k = 0;
915 int length = key.Length;
916 int a;
917 for (int i = 0; i < 256; i++)
918 {
919 a = s[i];
920 j = (j + a + key[k]);
921 if (j >= 256)
922 {
923 j = j % 256;
924 }
925 s[i] = s[j];
926 s[j] = a;
927 if (++k >= length)
928 {
929 k = 0;
930 }
931 }
932 //根据上面的256的密钥数组 和 密文得到明文数组
933 int x = 0, y = 0, a2, b, c;
934 int length2 = miwen.Length;
935 int[] mingwen = new int[length2];
936 for (int i = 0; i < length2; i++)
937 {
938 x = x + 1;
939 x = x % 256;
940 a2 = s[x];
941 y = y + a2;
942 y = y % 256;
943 s[x] = b = s[y];
944 s[y] = a2;
945 c = a2 + b;
946 c = c % 256;
947 mingwen[i] = miwen[i] ^ s[c];
948 }
949 //明文数组转明文字符
950 char[] ming = new char[mingwen.Length];
951 for (int i = 0; i < mingwen.Length; i++)
952 {
953 ming[i] = (char)mingwen[i];
954 }
955 string mingwenstr = new string(ming);
956 return mingwenstr;
957 }
958 #endregion
959 }
960 }
