如何创建在C#密码保护的文件 [英] How to create a password protected file in C#
本文介绍了如何创建在C#密码保护的文件的处理方法,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
有点互补的,但是没办法一样,<一个href=\"http://stackoverflow.com/questions/740812/whats-the-easiest-way-to-encrypt-a-file-in-c\">this问题。
A bit complementary to, but no way the same as, this question.
如何创建一个密码保护的文件?
How to create a password protected file?
推荐答案
加密:
private const int SaltSize = 8;
public static void Encrypt( FileInfo targetFile, string password )
{
var keyGenerator = new Rfc2898DeriveBytes( password, SaltSize );
var rijndael = Rijndael.Create();
// BlockSize, KeySize in bit --> divide by 8
rijndael.IV = keyGenerator.GetBytes( rijndael.BlockSize / 8 );
rijndael.Key = keyGenerator.GetBytes( rijndael.KeySize / 8 );
using( var fileStream = targetFile.Create() )
{
// write random salt
fileStream.Write( keyGenerator.Salt, 0, SaltSize );
using( var cryptoStream = new CryptoStream( fileStream, rijndael.CreateEncryptor(), CryptoStreamMode.Write ) )
{
// write data
}
}
}
和解密:
public static void Decrypt( FileInfo sourceFile, string password )
{
// read salt
var fileStream = sourceFile.OpenRead();
var salt = new byte[SaltSize];
fileStream.Read( salt, 0, SaltSize );
// initialize algorithm with salt
var keyGenerator = new Rfc2898DeriveBytes( password, salt );
var rijndael = Rijndael.Create();
rijndael.IV = keyGenerator.GetBytes( rijndael.BlockSize / 8 );
rijndael.Key = keyGenerator.GetBytes( rijndael.KeySize / 8 );
// decrypt
using( var cryptoStream = new CryptoStream( fileStream, rijndael.CreateDecryptor(), CryptoStreamMode.Read ) )
{
// read data
}
}
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