public void CreateNew(string fileName, string passphrase)
{
_rsa = new RSACryptoServiceProvider(2048);
if (File.Exists(fileName))
{
File.Delete(fileName);
}
if (_fileStream != null)
{
_fileStream.Dispose();
}
_fileStream = File.Open(fileName, FileMode.CreateNew);
_header = EncryptionHelper.CreateHeader(_rsa, passphrase);
var memoryStream = new MemoryStream();
Serializer.Serialize(memoryStream, _header);
var headerBytes = memoryStream.ToArray();
var writer = new BinaryWriter(_fileStream);
writer.Write(headerBytes.Length);
writer.Write(headerBytes);
writer.Flush();
IsOpen = true;
IsLocked = false;
}
public void OpenDiary(string filePath)
{
_fileStream = File.Open(filePath, FileMode.Open);
_header = ReadHeader(_fileStream, out _headerLength);
_rsa = new RSACryptoServiceProvider();
_rsa.ImportCspBlob(_header.PublicKey);
IsLocked = true;
IsOpen = true;
}
public static DiaryHeader CreateHeader(RSACryptoServiceProvider rsa, string passphrase)
{
var header = new DiaryHeader();
header.PublicKey = rsa.ExportCspBlob(false);
var privateBlob = rsa.ExportCspBlob(true);
var rij = Rijndael.Create();
var encryptedStream = new MemoryStream();
using (var cs = new CryptoStream(encryptedStream, rij.CreateEncryptor(GetKey(passphrase), GetIV(passphrase)), CryptoStreamMode.Write))
{
cs.Write(privateBlob, 0, privateBlob.Length);
}
header.PrivateKeyEncrypted = encryptedStream.ToArray();
return(header);
}