C# 文件夹加密

分手后的思念是犯贱 2022-01-07 03:35 308阅读 0赞

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

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

2） 也可以生成密钥

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1   /// <summary>
     2         /// 生成一个64位的密钥
     3         /// </summary>
     4         /// <returns>string</returns>
     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         }

二、调用ZeroMemory 函数从内存中删除Key

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

三、加密文件

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1   /// <summary>
     2         /// 加密文件
     3         /// </summary>
     4         /// <param name="sInputFilename">待加密的文件的完整路径</param>
     5         /// <param name="sOutputFilename">加密后的文件的完整路径</param>
     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         }

四、解密文件

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1 /// <summary>
     2         /// 解密文件
     3         /// </summary>
     4         /// <param name="sInputFilename">待解密的文件的完整路径</param>
     5         /// <param name="sOutputFilename">解密后的文件的完整路径</param>
     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         }

五、完整代码

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1 /// <summary>
     2     /// 文件加密
     3     /// </summary>
     4     public class FileSecretHelper
     5     {
     6         /// <summary>
     7         /// 密钥，这个密码可以随便指定
     8         /// </summary>
     9         public static string sSecretKey = "?\a??64(?";
    10 
    11         /// <summary>
    12         /// 调用该函数从内存中删除的Key后使用
    13         /// </summary>
    14         [DllImport("KERNEL32.DLL", EntryPoint = "RtlZeroMemory")]
    15         public static extern bool ZeroMemory(IntPtr Destination, int Length);
    16 
    17 
    18         /// <summary>
    19         /// 生成一个64位的密钥
    20         /// </summary>
    21         /// <returns>string</returns>
    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         /// <summary>
    32         /// 加密文件
    33         /// </summary>
    34         /// <param name="sInputFilename">待加密的文件的完整路径</param>
    35         /// <param name="sOutputFilename">加密后的文件的完整路径</param>
    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         /// <summary>
    60         /// 解密文件
    61         /// </summary>
    62         /// <param name="sInputFilename">待解密的文件的完整路径</param>
    63         /// <param name="sOutputFilename">解密后的文件的完整路径</param>
    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     }

转载于:https://www.cnblogs.com/OnlyVersion/p/4025728.html

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