C# 文件夹加密-白红宇

C# 文件夹加密

阅读量：7171 次

发布时间：2019-06-29

本文共 6075 字，大约阅读时间需要 20 分钟。

可以加密文件内容，也可以对文件夹本身进行加密，本文对文件夹加密。

一、指定或生成一个密钥

1）指定的密钥

1  /// 2         /// 密钥，这个密码可以随便指定3         /// 
4         public static string sSecretKey = "?\a??64(?";

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2）也可以生成密钥

1   ///  2         /// 生成一个64位的密钥 3         /// 
 4         /// 
      
       string
       5         public static string GenerateKey() 6         { 7             //创建对称算法的一个实例。自动生成的密钥和IV。 8             DESCryptoServiceProvider desCrypto = (DESCryptoServiceProvider)DESCryptoServiceProvider.Create(); 9 10             // 使用自动生成的密钥进行加密。11             return ASCIIEncoding.ASCII.GetString(desCrypto.Key);12         }

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二、调用ZeroMemory 函数从内存中删除Key

1  /// 2         /// 调用该函数从内存中删除的Key后使用3         /// 
4         [DllImport("KERNEL32.DLL", EntryPoint = "RtlZeroMemory")]5         public static extern bool ZeroMemory(IntPtr Destination, int Length);

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三、加密文件

1   ///  2         /// 加密文件 3         /// 
 4         /// 待加密的文件的完整路径 5         /// 加密后的文件的完整路径 6         public static void EncryptFile(string sInputFilename, string sOutputFilename) 7         { 8             FileStream fsInput = new FileStream(sInputFilename, FileMode.Open, FileAccess.Read); 9 10             FileStream fsEncrypted = new FileStream(sOutputFilename, FileMode.Create, FileAccess.Write);11             DESCryptoServiceProvider DES = new DESCryptoServiceProvider();12             DES.Key = ASCIIEncoding.ASCII.GetBytes(sSecretKey);13             DES.IV = ASCIIEncoding.ASCII.GetBytes(sSecretKey);14             ICryptoTransform desencrypt = DES.CreateEncryptor();15             CryptoStream cryptostream = new CryptoStream(fsEncrypted, desencrypt, CryptoStreamMode.Write);16 17             byte[] bytearrayinput = new byte[fsInput.Length];18             fsInput.Read(bytearrayinput, 0, bytearrayinput.Length);19             cryptostream.Write(bytearrayinput, 0, bytearrayinput.Length);20 21             cryptostream.Flush();22             fsInput.Flush();23             fsEncrypted.Flush();24             cryptostream.Close();25             fsInput.Close();26             fsEncrypted.Close();27         }

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四、解密文件

1 ///  2         /// 解密文件 3         /// 
 4         /// 待解密的文件的完整路径 5         /// 解密后的文件的完整路径 6         public static void DecryptFile(string sInputFilename, string sOutputFilename) 7         { 8             DESCryptoServiceProvider DES = new DESCryptoServiceProvider(); 9             DES.Key = ASCIIEncoding.ASCII.GetBytes(sSecretKey);10             DES.IV = ASCIIEncoding.ASCII.GetBytes(sSecretKey);11 12             FileStream fsread = new FileStream(sInputFilename, FileMode.Open, FileAccess.Read);13             ICryptoTransform desdecrypt = DES.CreateDecryptor();14             CryptoStream cryptostreamDecr = new CryptoStream(fsread, desdecrypt, CryptoStreamMode.Read);15             StreamWriter fsDecrypted = new StreamWriter(sOutputFilename);16             fsDecrypted.Write(new StreamReader(cryptostreamDecr).ReadToEnd());17             fsDecrypted.Flush();18             fsDecrypted.Close();19         }

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五、完整代码

1 ///  2     /// 文件加密 3     /// 
 4     public class FileSecretHelper 5     { 6         ///  7         /// 密钥，这个密码可以随便指定 8         /// 
 9         public static string sSecretKey = "?\a??64(?";10 11         /// 12         /// 调用该函数从内存中删除的Key后使用13         /// 
14         [DllImport("KERNEL32.DLL", EntryPoint = "RtlZeroMemory")]15         public static extern bool ZeroMemory(IntPtr Destination, int Length);16 17 18         /// 19         /// 生成一个64位的密钥20         /// 
21         /// 
      
       string
      22         public static string GenerateKey()23         {24             //创建对称算法的一个实例。自动生成的密钥和IV。25             DESCryptoServiceProvider desCrypto = (DESCryptoServiceProvider)DESCryptoServiceProvider.Create();26 27             // 使用自动生成的密钥进行加密。28             return ASCIIEncoding.ASCII.GetString(desCrypto.Key);29         }30 31         /// 32         /// 加密文件33         /// 
34         /// 待加密的文件的完整路径35         /// 加密后的文件的完整路径36         public static void EncryptFile(string sInputFilename, string sOutputFilename)37         {38             FileStream fsInput = new FileStream(sInputFilename, FileMode.Open, FileAccess.Read);39 40             FileStream fsEncrypted = new FileStream(sOutputFilename, FileMode.Create, FileAccess.Write);41             DESCryptoServiceProvider DES = new DESCryptoServiceProvider();42             DES.Key = ASCIIEncoding.ASCII.GetBytes(sSecretKey);43             DES.IV = ASCIIEncoding.ASCII.GetBytes(sSecretKey);44             ICryptoTransform desencrypt = DES.CreateEncryptor();45             CryptoStream cryptostream = new CryptoStream(fsEncrypted, desencrypt, CryptoStreamMode.Write);46 47             byte[] bytearrayinput = new byte[fsInput.Length];48             fsInput.Read(bytearrayinput, 0, bytearrayinput.Length);49             cryptostream.Write(bytearrayinput, 0, bytearrayinput.Length);50 51             cryptostream.Flush();52             fsInput.Flush();53             fsEncrypted.Flush();54             cryptostream.Close();55             fsInput.Close();56             fsEncrypted.Close();57         }58 59         /// 60         /// 解密文件61         /// 
62         /// 待解密的文件的完整路径63         /// 解密后的文件的完整路径64         public static void DecryptFile(string sInputFilename, string sOutputFilename)65         {66             DESCryptoServiceProvider DES = new DESCryptoServiceProvider();67             DES.Key = ASCIIEncoding.ASCII.GetBytes(sSecretKey);68             DES.IV = ASCIIEncoding.ASCII.GetBytes(sSecretKey);69 70             FileStream fsread = new FileStream(sInputFilename, FileMode.Open, FileAccess.Read);71             ICryptoTransform desdecrypt = DES.CreateDecryptor();72             CryptoStream cryptostreamDecr = new CryptoStream(fsread, desdecrypt, CryptoStreamMode.Read);73             StreamWriter fsDecrypted = new StreamWriter(sOutputFilename);74             fsDecrypted.Write(new StreamReader(cryptostreamDecr).ReadToEnd());75             fsDecrypted.Flush();76             fsDecrypted.Close();77         }78     }