public async Task TestProtectedDecrypt()
{
var protectedString = "QwzFTMLCpNY=";
var protectedStringBytes = Convert.FromBase64String(protectedString);
var rando = new CryptoRandomStream(CrsAlgorithm.Salsa20, Convert.FromBase64String("6tDlwZfwES4jAQzLisWdpNdnuTYyDZfflEdbshzdgi8="), new SHA256HasherRT());
var getByte = rando.GetRandomBytes((uint)protectedStringBytes.Length);
byte[] pbPlain = new byte[protectedStringBytes.Length];
for (int i = 0; i < pbPlain.Length; ++i)
pbPlain[i] = (byte)(protectedStringBytes[i] ^ getByte[i]);
string mypass = UTF8Encoding.UTF8.GetString(pbPlain, 0, pbPlain.Length);
Assert.AreEqual("Password", mypass);
}
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);
}
public Kdb4Parser(CryptoRandomStream crypto)
{
_cryptoStream = crypto;
}
public Kdb4Persister(CryptoRandomStream stream)
{
this.cryptoRandomStream = stream;
}