如何在 C# 中创建受密码保护的文件
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时间：2020-08-04 23:20:36 来源:igfitidea点击:
How to create a password protected file in C#
提问by Peter
采纳答案by tanascius
encrypt:
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
}
}
}
and decrypt:
并解密：
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
}
}
回答by JMD
Use the RijndaelManaged class for encryption and Rfc2898DeriveBytes to generate the key (and IV) for the crypto.
使用 RijndaelManaged 类进行加密，使用 Rfc2898DeriveBytes 生成加密的密钥（和 IV）。
