public async Task<byte[]> GenerateAESKey()
{
var pwDatabase = file.pwDatabase;
var keyGenerator = new KeyGenerator(
_hasher,
_keyTransformer,
pwDatabase.MasterKey,
pwDatabase.MasterKey.PercentComplete);
var aesKey = await keyGenerator.GenerateHashedKeyAsync(file.pbMasterSeed, file.pbTransformSeed, (int)pwDatabase.KeyEncryptionRounds);
return aesKey;
}
public async Task Write(PwDatabase databaseData, IFile databaseFile)
{
kdb4File = new Kdb4File(databaseData);
ResetHeaderBytes();
MemoryStream memStream = new MemoryStream();
BinaryWriter writer = new BinaryWriter(memStream);
_headerWriter.WriteHeaders(writer, kdb4File);
var header = memStream.ToArray();
var hashOfHeader = _hasher.Hash(header);
var outStream = new MemoryStream();
await outStream.WriteAsync(kdb4File.pbStreamStartBytes, 0, (int)kdb4File.pbStreamStartBytes.Length);
var configuredStream = ConfigureStream(outStream);
var persister = new Kdb4Persister(new CryptoRandomStream(CrsAlgorithm.Salsa20, kdb4File.pbProtectedStreamKey, _hasher));
var data = persister.Persist(databaseData.Tree, hashOfHeader);
try
{
await Task.Run(() =>
configuredStream.Write(data, 0, data.Length));
}
catch(Exception e)
{
}
configuredStream.Dispose();
var compressed = outStream.ToArray();
var keyGenerator = new KeyGenerator(
_hasher,
_keyTransformer,
databaseData.MasterKey,
databaseData.MasterKey.PercentComplete);
var aesKey = await keyGenerator.GenerateHashedKeyAsync(kdb4File.pbMasterSeed, kdb4File.pbTransformSeed, (int)databaseData.KeyEncryptionRounds);
var encrypted = await _databaseEncryptor.Encrypt(compressed, aesKey, kdb4File.pbEncryptionIV);
writer.Write(encrypted);
var streamToWriteToFile = writer.BaseStream;
streamToWriteToFile.Position = 0;
var bytesToWrite = streamToWriteToFile.ToArray();
var databaseStream = await databaseFile.OpenAsync(FileAccess.ReadAndWrite);
databaseStream.SetLength(0);
await databaseStream.FlushAsync();
await databaseStream.WriteAsync(bytesToWrite, 0, bytesToWrite.Length);
await databaseStream.FlushAsync();
databaseStream.Dispose();
var cryptoStream = new CryptoRandomStream(CrsAlgorithm.Salsa20, kdb4File.pbProtectedStreamKey,_hasher);
var parser = new Kdb4Parser(cryptoStream);
databaseData.Tree = parser.ParseAndDecode(databaseData.Tree.Document);
}
