private StreamWriter GetEncryptedStreamWriter(string fileFullPath)
{
SafeDirectoryGenerator.GenerateDirectory(fileFullPath);
var underlyingStream = new FileStream(fileFullPath, FileMode.OpenOrCreate);
var rijndael = Rijndael.Create();
var encryptInfo = EncryptManager.CreateEncryptInfo();
rijndael.Key = encryptInfo.Key;
rijndael.IV = encryptInfo.Iv;
// ファイルの先頭に初期ベクトルを追加
underlyingStream.Write(encryptInfo.Iv, 0, encryptInfo.Iv.Length);
var encryptedStream =
new CryptoStream(underlyingStream, rijndael.CreateEncryptor(), CryptoStreamMode.Write);
return(new StreamWriter(encryptedStream));
}
private StreamReader GetEncryptedStreamReader(string fileFullPath)
{
SafeDirectoryGenerator.GenerateDirectory(fileFullPath);
var underlyingStream = new FileStream(fileFullPath, FileMode.Open);
byte[] iv = new byte[EncryptManager.IV_LENGTH];
// ファイルの先頭から初期ベクトルを取得
underlyingStream.Read(iv, 0, EncryptManager.IV_LENGTH);
var rijndael = Rijndael.Create();
var encryptInfo = EncryptManager.CreateEncryptInfo();
rijndael.Key = encryptInfo.Key;
rijndael.IV = iv;
var encryptedStream = new CryptoStream(underlyingStream, rijndael.CreateDecryptor(), CryptoStreamMode.Read);
return(new StreamReader(encryptedStream));
}
private StreamReader GetStreamReader(string fileFullPath)
{
SafeDirectoryGenerator.GenerateDirectory(fileFullPath);
return(new StreamReader(new FileStream(fileFullPath, FileMode.Open)));
}