static int Main(string[] args)
{
if (args.Length < 1)
{
Console.WriteLine(PuzzleFileFns.StandardOneParamRequiredErrorMessage);
return(1);
}
var allLines = File.ReadAllLines(args[0]);
int payloadStartLine = PuzzleFileFns.GetLinePayloadStartsAt(allLines);
var payload = PuzzleFileFns.GetPayloadAsOneLongString(allLines, payloadStartLine);
Debug.Assert(payload.StartsWith(@"<~0/)?#c'P?"));
Debug.Assert(payload.EndsWith(@"ZOG^Hi`#W@:,!~>"));
Debug.Assert(payload.Contains("\n") == false);
Debug.Assert(BitwiseFns.FlipEverySecondBit(180) == 225);
Debug.Assert(BitwiseFns.RotateByteRight(225) == 240);
Func <byte, byte> bytePostProcess =
(inByte) => BitwiseFns.RotateByteRight(BitwiseFns.FlipEverySecondBit(inByte));
Debug.Assert(bytePostProcess(180) == 240);
var payloadSpan = Ascii85Fns.DecodeAsSpan(payload, 2);
var transformedBytes = payloadSpan.ToArray().Select(bytePostProcess).ToArray();
Console.Write(Encoding.ASCII.GetString(transformedBytes));
return(0);
}
static int Main(string[] args)
{
if (args.Length < 1)
{
Console.WriteLine(PuzzleFileFns.StandardOneParamRequiredErrorMessage);
return(1);
}
var allLines = File.ReadAllLines(args[0]);
int payloadStartLine = PuzzleFileFns.GetLinePayloadStartsAt(allLines);
var payload = PuzzleFileFns.GetPayloadAsOneLongString(allLines, payloadStartLine);
Debug.Assert(payload.StartsWith("<~70!<j!!#7a+;"));
Debug.Assert(payload.EndsWith(":j*\"<<*=Q1C=~>"));
Debug.Assert(payload.Contains("\n") == false);
var ipv4PacketsSpan = Ascii85Fns.DecodeAsSpan(payload, 2);
var packetStream = new MemoryStream(ipv4PacketsSpan.ToArray());
var memBuffer = new MemoryStream();
foreach (var ipv4Frame in IPv4Fns.IterateFrames(packetStream))
{
if (!ipv4Frame.Header.ChecksumOK)
{
continue;
}
var udpFrame = UDPFns.DecodeUDP(ipv4Frame.Data);
if (!PacketFilter(ipv4Frame.Header, udpFrame))
{
continue;
}
memBuffer.Write(udpFrame.Data, 0, udpFrame.Data.Length);
}
// Debugging:
// var ipv4frame = IPv4Fns.IterateFrames(payloadStream).Last();
// System.Console.WriteLine(
// UDPFns.UDPToDebugString(
// ipv4frame.Header.SourceAddress,
// ipv4frame.Header.DestinationAddress,
// UDPFns.DecodeUDP(ipv4frame.Data)));
// var udpPacket = UDPFns.DecodeUDP(ipv4frame.Data);
// var checksum = UDPFns.UDPChecksum(ipv4frame.Header.SourceAddress, ipv4frame.Header.DestinationAddress, udpPacket);
// System.Console.WriteLine("Checksum (calc)={0:x4}", checksum);
memBuffer.Position = 0L;
Console.WriteLine(Encoding.ASCII.GetString(memBuffer.ToArray()));
return(0);
}
static int Main(string[] args)
{
if (args.Length < 1)
{
Console.WriteLine(PuzzleFileFns.StandardOneParamRequiredErrorMessage);
return(1);
}
var allLines = File.ReadAllLines(args[0]);
int payloadStartLine = PuzzleFileFns.GetLinePayloadStartsAt(allLines);
var payload = PuzzleFileFns.GetPayloadAsOneLongString(allLines, payloadStartLine);
Debug.Assert(payload.StartsWith("<~;&S8o%X?BS"));
Debug.Assert(payload.EndsWith(@"uQ&0qa8h%~>"));
Debug.Assert(payload.Contains("\n") == false);
var cipherBytes = Ascii85Fns.DecodeAsSpan(payload, 2).ToArray();
// We know what the plaintext should start with, so those bytes are easy to find:
var plainText1Bytes = Encoding.ASCII.GetBytes("==[ Layer 4/5: ");
var first15KeyBytes = ByteArrayFns.XOR(cipherBytes.Take(15).ToArray(), plainText1Bytes).ToArray();
var partialOneTimePad = first15KeyBytes.Concat(new byte[17]).ToArray();
// We also know the line "==[ Payload ]===============================================" should appear, and it's position is easy to find from the partially descrambled file:
var partialDescramble = Encoding.ASCII.GetString(ByteArrayFns.OneTimePadScramble(cipherBytes, partialOneTimePad).ToArray());
var offsetToUnscrambled = partialDescramble.IndexOf("==[ Pay") + 7;
var stillScrambledBytes = cipherBytes.Skip(offsetToUnscrambled).Take(17).ToArray();
var expectedPlainTextBytes = Encoding.ASCII.GetBytes("load ]===========");
var last17KeyBytes = ByteArrayFns.XOR(stillScrambledBytes, expectedPlainTextBytes).ToArray();
var finalOneTimePad = first15KeyBytes.Concat(last17KeyBytes).ToArray();
var plainTextBytes = ByteArrayFns.OneTimePadScramble(cipherBytes, finalOneTimePad).ToArray();
Console.WriteLine(Encoding.ASCII.GetString(plainTextBytes));
return(0);
}
static int Main(string[] args)
{
if (args.Length < 1)
{
Console.WriteLine(PuzzleFileFns.StandardOneParamRequiredErrorMessage);
return(1);
}
var allLines = File.ReadAllLines(args[0]);
int payloadStartLine = PuzzleFileFns.GetLinePayloadStartsAt(allLines);
var payload = PuzzleFileFns.GetPayloadAsOneLongString(allLines, payloadStartLine);
Debug.Assert(payload.StartsWith("<~$O=cdK]PkWZ"));
Debug.Assert(payload.EndsWith("/UHOHO4@~>"));
Debug.Assert(payload.Contains("\n") == false);
var payloadSpan = Ascii85Fns.DecodeAsSpan(payload, 2);
var kekSpan = payloadSpan.Slice(0, 32);
var ivWrapSpan = payloadSpan.Slice(32, 8);
var encryptedKeySpan = payloadSpan.Slice(40, 40);
var ivSpan = payloadSpan.Slice(80, 16);
var encryptedPayloadSpan = payloadSpan.Slice(96);
Debug.Assert(HexFns.ToHex(kekSpan.ToArray()) == "0b07c91284e54bd5b3a356451eda9d38e9770f505fef14f0e62c74f3fd1f286a");
Debug.Assert(HexFns.ToHex(ivWrapSpan.ToArray()) == "badc0ffeebadc0de");
Debug.Assert(HexFns.ToHex(ivSpan.ToArray()) == "8c2e487274dbebe699677f1b54ebbeb4");
var plainTextKeyBytes = CryptoFns.DecryptKey(kekSpan.ToArray(),
ivWrapSpan.ToArray(), encryptedKeySpan.ToArray());
Debug.Assert(HexFns.ToHex(plainTextKeyBytes) == "c68cade3c9c973067b383b77713ddac8072e05d2bb54a8a2d45b312ce8817024");
var plainText = CryptoFns.Decrypt(plainTextKeyBytes, ivSpan.ToArray(),
encryptedPayloadSpan.ToArray());
Console.WriteLine(Encoding.ASCII.GetString(plainText));
return(0);
}
static int Main(string[] args)
{
if (args.Length < 1)
{
Console.WriteLine("\nRequired params:\nparam 1: path to original TDO file");
Console.WriteLine("\nLinux tips: dotnet run -p layer0 `realpath toms-data-onion.txt`");
return(1);
}
var allLines = File.ReadAllLines(args[0]);
int payloadStartLine = PuzzleFileFns.GetLinePayloadStartsAt(allLines);
var payload = PuzzleFileFns.GetPayloadAsOneLongString(allLines, payloadStartLine);
Debug.Assert(payload.StartsWith(@"<~4[!!l9OW3XEZ"));
Debug.Assert(payload.EndsWith(@"\d<,?I,k/0TI+$46~>"));
Debug.Assert(payload.Contains("\n") == false);
var payloadSpan = Ascii85Fns.DecodeAsSpan(payload, 2);
Console.Write(Encoding.ASCII.GetString(payloadSpan.ToArray()));
return(0);
}
static int Main(string[] args)
{
if (args.Length < 1)
{
Console.WriteLine(PuzzleFileFns.StandardOneParamRequiredErrorMessage);
return(1);
}
var allLines = File.ReadAllLines(args[0]);
int payloadStartLine = PuzzleFileFns.GetLinePayloadStartsAt(allLines);
var payload = PuzzleFileFns.GetPayloadAsOneLongString(allLines, payloadStartLine);
Debug.Assert(payload.StartsWith("<~4J,Yc\"_331o4>"));
Debug.Assert(payload.EndsWith(@"<Y),nDu&4~>"));
Debug.Assert(payload.Contains("\n") == false);
Debug.Assert(ParityFns.OneBitParityCheck(178));
Debug.Assert(ParityFns.OneBitParityCheck(0b01000001));
Debug.Assert(ParityFns.OneBitParityCheck(0b00000001) == false);
Debug.Assert(ParityFns.OneBitParityCheck(0b01001010) == false);
var bsbTest = new BitStreamBuilder();
bsbTest.Add7Bits(128);
bsbTest.Add7Bits(128);
bsbTest.Add7Bits(128);
bsbTest.Add7Bits(128);
bsbTest.Add7Bits(128);
bsbTest.Add7Bits(128);
bsbTest.Add7Bits(128);
bsbTest.Add7Bits(128);
bsbTest.Add7Bits(128);
bsbTest.Add7Bits(128);
var bytesTest = bsbTest.MaterializeStream().ToArray();
Debug.Assert(bytesTest[0] == 129);
Debug.Assert(bytesTest[1] == 2);
Debug.Assert(bytesTest[2] == 4);
Debug.Assert(bytesTest[3] == 8);
Debug.Assert(bytesTest[4] == 16);
Debug.Assert(bytesTest[5] == 32);
Debug.Assert(bytesTest[6] == 64);
Debug.Assert(bytesTest[7] == 129);
var payloadSpan = Ascii85Fns.DecodeAsSpan(payload, 2);
var builder = new BitStreamBuilder();
foreach (var aByte in payloadSpan.ToArray())
{
if (!ParityFns.OneBitParityCheck(aByte))
{
continue;
}
builder.Add7Bits(aByte);
}
var decoded = builder.MaterializeStream().ToArray();
Console.Write(Encoding.ASCII.GetString(decoded));
return(0);
}