static string DecodeString(byte[] data)
{
var ms = new MemoryStream(data);
var xs = new XorStream(ms);
byte[] buff = new byte[data.Length];
xs.Read(buff, 0, buff.Length);
return(Encoding.UTF8.GetString(buff));
}
private Task <bool> DoCipher(Stream input, Stream output, IProgress <ProgressReport> progress, bool decrypt)
{
var requestId = Guid.NewGuid().ToString("N");
var key = OnRequestKey("XOR Key", -1, requestId, out var error);
if (key == null)
{
return(Task.Factory.StartNew(() =>
{
progress.Report(new ProgressReport {
Percentage = 0, Message = error
});
return false;
}));
}
return(Task.Factory.StartNew(() =>
{
progress.Report(new ProgressReport {
Percentage = 0, Message = decrypt ? "Decryption..." : "Encryption..."
});
using (var xor = new XorStream(decrypt ? input : output, key))
{
var buffer = new byte[0x10000];
var totalLength = decrypt ? xor.Length : input.Length;
while (xor.Position < totalLength)
{
var length = (int)Math.Min(0x10000, totalLength - xor.Position);
if (decrypt)
{
xor.Read(buffer, 0, length);
output.Write(buffer, 0, length);
}
else
{
input.Read(buffer, 0, length);
xor.Write(buffer, 0, length);
}
progress.Report(new ProgressReport {
Percentage = (double)xor.Position / totalLength * 100, Message = decrypt ? "Decryption..." : "Encryption...",
});
}
}
progress.Report(new ProgressReport {
Percentage = 100, Message = decrypt ? "Decryption finished." : "Encryption finished."
});
return true;
}));
}
public void ReadBytes()
{
var data = Enumerable.Range(0, 256).Select(d => (byte)d).ToArray();
byte encByte = 0x73;
var dataExpected = data.Select(d => d ^ encByte).Select(d => (byte)d).ToArray();
using (var ms = new MemoryStream(data))
{
var stream = new XorStream(ms, encByte);
var output = new byte[256];
stream.Read(output, 0, 256);
Check.That(output).ContainsExactly(dataExpected);
}
}