任何文件格式的加密和解密 [英] Encryption and Decryption of any file format
本文介绍了任何文件格式的加密和解密的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我在我的Windows应用程序中使用SQLite数据库，它必须将数据库文件的备份复制到闪存驱动器。我想加密这个文件，但我在网上找到的所有解决方案根本不起作用，但下面显示的代码可以用于文本文件，但会破坏加密它的数据库文件。请我帮你解决这个问题。谢谢。
I''m using SQLite database in my windows application which has to copy a backup of the database file to a flash drive. I would like to encrypt this file but all the solutions i found online would not work at all but the codes shown below would work on text files but would corrupt the database file ones it encrypts it. Please i need your help to figure this out. Thanks.
using System ;
using System . Collections . Generic ;
using System . ComponentModel ;
using System . Data ;
using System . Drawing ;
using System . Linq ;
using System . Text ;
using System . Windows . Forms ;
using System . IO ;
using System . Security . Cryptography ;namespace DES
{
public partial class Form1 : Form
{
static string sKey ;
public Form1 ()
{
InitializeComponent ();
}
private void button1_Click ( object sender , EventArgs e )
{
sKey = GenerateKey ();
if ( openFileDialog1 . ShowDialog () == DialogResult . OK )
{
string source = openFileDialog1 . FileName ;
saveFileDialog1 . Filter = "des files |*.des" ;
if ( saveFileDialog1 . ShowDialog () == DialogResult . OK )
{
string destination = saveFileDialog1 . FileName ;
EncryptFile ( source , destination , sKey );
}
}
MessageBox . Show ( "Succesfully Encrypted!" );
}
private void EncryptFile ( string source , string destination , string sKey )
{
FileStream fsInput = new FileStream ( source ,
FileMode . Open ,
FileAccess . Read );
FileStream fsEncrypted = new FileStream ( destination ,
FileMode . Create ,
FileAccess . Write );
DESCryptoServiceProvider DES = new DESCryptoServiceProvider ();
DES . Key = ASCIIEncoding . ASCII . GetBytes ( sKey );
DES . IV = ASCIIEncoding . ASCII . GetBytes ( sKey );
ICryptoTransform desencrypt = DES . CreateEncryptor ();
CryptoStream cryptostream = new CryptoStream ( fsEncrypted ,
desencrypt ,
CryptoStreamMode . Write );
byte [] bytearrayinput = new byte [ fsInput . Length - 1 ];
fsInput . Read ( bytearrayinput , 0 , bytearrayinput . Length );
cryptostream . Write ( bytearrayinput , 0 , bytearrayinput . Length );
cryptostream . Close ();
fsInput . Close ();
fsEncrypted . Close ();
}
//function to generate a 64 bit key
private string GenerateKey ()
{
// Create an instance of Symetric Algorithm. Key and IV is generated automatically.
DESCryptoServiceProvider desCrypto = ( DESCryptoServiceProvider ) DESCryptoServiceProvider . Create ();
// Use the Automatically generated key for Encryption.
return ASCIIEncoding . ASCII . GetString ( desCrypto . Key );
}
private void button2_Click ( object sender , EventArgs e )
{
openFileDialog1 . Filter = "des files |*.des" ;
if ( openFileDialog1 . ShowDialog () == DialogResult . OK )
{
string source = openFileDialog1 . FileName ;
if ( saveFileDialog1 . ShowDialog () == DialogResult . OK )
{
string destination = saveFileDialog1 . FileName ;
DecryptFile ( source , destination , sKey );
}
}
MessageBox . Show ( "Succesfully Dencrypted!" );
}
private void DecryptFile ( string source , string destination , string sKey )
{
DESCryptoServiceProvider DES = new DESCryptoServiceProvider ();
//A 64 bit key and IV is required for this provider.
//Set secret key For DES algorithm.
DES . Key = ASCIIEncoding . ASCII . GetBytes ( sKey );
//Set initialization vector.
DES . IV = ASCIIEncoding . ASCII . GetBytes ( sKey );
//Create a file stream to read the encrypted file back.
FileStream fsread = new FileStream ( source ,
FileMode . Open ,
ICryptoTransform desdecrypt = DES . CreateDecryptor ();
//Create crypto stream set to read and do a
//DES decryption transform on incoming bytes.
CryptoStream cryptostreamDecr = new CryptoStream ( fsread ,
desdecrypt ,
CryptoStreamMode . Read );
//Print the contents of the decrypted file.
StreamWriter fsDecrypted = new StreamWriter ( destination );
fsDecrypted . Write ( new StreamReader ( cryptostreamDecr ). ReadToEnd ());
fsDecrypted . Flush ();
fsDecrypted . Close ();
}
}
}
推荐答案
我会使用 MSDN提供的示例代码 [ ^ ]。
System.Data.SQLite本身可以加密数据库。
System.Data.SQLiteitself can encrypt the database.
var conn = new System.Data.SQLite.SQLiteConnection();
conn.ConnectionString = "data source=C:\\db;password=1234";
conn.Open();
conn.Close();
更改密码：
Change password:
var conn = new System.Data.SQLite.SQLiteConnection();
conn.ConnectionString = "data source=C:\\db;password=1234";
conn.Open();
conn.ChangePassword("5678");
conn.Close();
这篇关于任何文件格式的加密和解密的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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