A bit complementary to, but no way the same as, this question.
How to create a password protected file?
encrypt:
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:
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
}
}
使用RijndaelManaged类进行加密,使用Rfc2898DeriveBytes生成加密密钥(和IV)。
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