文件File加密解密

 1     /// <summary>
 2     /// 文件操作帮助类,提供文件加密、解密
 3     /// </summary>
 4     public class FileHelper
 5     {
 6 
 7         //public const string fileEncrityKey = "dbe06967-669d-41dbe06967-669d-41";
 8         public const string fileEncrityKey = "ihlih*0037JOHT*)(PIJY*(()JI^)IO%";
 9 
10 
11         /// <summary>
12         /// 加密
13         /// </summary>
14         /// <param name="docPath">要加密的文件路径</param>
15         /// <param name="destPath">加密后的文件路径</param>
16         /// <param name="strKey">秘钥</param>
17         public static void Encrypt(string docPath, string destPath, string strKey)
18         {
19             //分组加密算法
20             using (var fs = new FileStream(docPath, FileMode.Open))
21             {
22                 var buffer = new byte[fs.Length];
23                 fs.Read(buffer, 0, buffer.Length);//得到需要加密的字节数组    
24                 //设置密钥,密钥向量，两个一样，都是16个byte
25                 var rDel = new RijndaelManaged();
26                 var key = Encoding.UTF8.GetBytes(strKey);
27                 rDel.Key = key;
28                 rDel.Mode = CipherMode.ECB;
29                 rDel.Padding = PaddingMode.PKCS7;
30                 ICryptoTransform cTransform = rDel.CreateEncryptor();
31                 byte[] cipherBytes = cTransform.TransformFinalBlock(buffer, 0, buffer.Length);
32                 var fsEncrypt = new FileStream(destPath, FileMode.Create, FileAccess.Write);
33                 fsEncrypt.Write(cipherBytes, 0, cipherBytes.Length);
34             }
35         }
36 
37         //解密，fileIn:解密的文件路径，fileOut:解密后的文件存放路径,strKey:秘钥
38         public static void Decrypt(string fileIn, string fileOut, string strKey)
39         {
40             var fsIn = new FileStream(fileIn, FileMode.Open, FileAccess.Read);
41             var fsOut = new FileStream(fileOut, FileMode.OpenOrCreate, FileAccess.Write);
42             var rDel = new RijndaelManaged();
43             var key = Encoding.UTF8.GetBytes(strKey);
44             rDel.Key = key;
45             rDel.Mode = CipherMode.ECB;
46             rDel.Padding = PaddingMode.PKCS7;
47             var cs = new CryptoStream(fsOut, rDel.CreateDecryptor(), CryptoStreamMode.Write);
48             var bufferLen = 4096;
49             var buffer = new byte[bufferLen];
50             int bytesRead;
51             do
52             {
53                 bytesRead = fsIn.Read(buffer, 0, bufferLen);
54                 cs.Write(buffer, 0, bytesRead);
55             } while (bytesRead != 0);
56             cs.Close();
57             fsIn.Close();
58             fsIn.Dispose();
59             fsOut.Dispose();
60         }
61     }