private async void HandleWiteTag(INFCMiFareTag nMifareTag)
{
byte[] data = await Read4Pages(nMifareTag, 0);
// write
if (data != null)
{
byte[] FirstTag = MainTabViewModel.Current?.DataBag.GetData();
byte[] mem = new byte[80];
data.CopyTo(mem, 0);
byte[] dstData = MainTabViewModel.MergeTagData(FirstTag, mem);
bool result = true;
for (byte i = 4; result && (i < 16); i++)
{
result = await WritePage(nMifareTag, i, dstData.Skip(4 * i).Take(4).ToArray());
}
if (result)
{
MainTabViewModel.Current?.DataBag.SetData(dstData);
}
}
MainTabViewModel.Current.cbNFCRead = false;
MainTabViewModel.Current.cbNFCWrite = false;
}
private async void HandleReadTag(INFCMiFareTag nMifareTag)
{
byte[] FirstTag = MainTabViewModel.Current?.DataBag.GetData();
byte[] data = await Read4Pages(nMifareTag, 4);
if (data != null)
{
data.CopyTo(FirstTag, 16);
data = await Read4Pages(nMifareTag, 8);
if (data != null)
{
data.CopyTo(FirstTag, 32);
data = await Read4Pages(nMifareTag, 12);
if (data != null)
{
data.CopyTo(FirstTag, 48);
MainThread.BeginInvokeOnMainThread(() => MainTabViewModel.Current?.SetControlsVisibility(FirstTag[41]));
MainTabViewModel.Current?.DataBag.SetData(FirstTag);
}
}
}
MainTabViewModel.Current.cbNFCRead = false;
MainTabViewModel.Current.cbNFCWrite = false;
}
public static async Task <byte[]> DoFastRead(
this INFCMiFareTag tag,
byte from,
byte to,
byte batchSize)
{
var results = new List <MifareCommandResult>();
while (from < to)
{
var thisTo = (byte)Math.Min(from + batchSize, to);
var data = await tag.SendMifareCommand(0x3a, from, thisTo);
results.Add(data);
from = (byte)(from + (byte)(batchSize + 0x1));
}
if (results.Any(x => x.Error != null))
{
throw new Exception($"Failed to fast read; first error: {results.First(x => x.Error != null).Error}");
}
var all = MifareCommandResult.Combine(results);
return(all.Data);
}
public Task <bool> WritePage(INFCMiFareTag tag, byte page, byte [] data)
{
var tcs = new TaskCompletionSource <bool>();
tag.SendMiFareCommand(NSData.FromArray(new byte[] { 0xA2, page, data[0], data[1], data[2], data[3] }),
(tagdata, error) => tcs.SetResult((tagdata != null) && (error == null) && (tagdata.Count() == 1)));
return(tcs.Task);
}
public static Task <MifareCommandResult> SendMifareCommand(
this INFCMiFareTag tag, params byte[] command)
{
var tcs = new TaskCompletionSource <MifareCommandResult>();
tag.SendMiFareCommand(
NSData.FromArray(command),
(data, err) => tcs.SetResult(MifareCommandResult.From(data, err)));
return(tcs.Task);
}
public static async Task <byte[]> WritePage(
this INFCMiFareTag tag,
byte page,
byte[] data)
{
var cmd = new byte[] { 0xa2, (byte)(page) }.Concat(data).ToArray();
var result = await tag.SendMifareCommand(cmd);
if (result.Error != null)
{
Debug.WriteLine(result.Error);
}
return(result.Data);
}
public Task <byte[]> Read4Pages(INFCMiFareTag tag, byte page)
{
var tcs = new TaskCompletionSource <byte[]>();
tag.SendMiFareCommand(NSData.FromArray(new byte[] { 0x30, page }), (data, error) =>
{
if ((data != null) && (error == null) && (data.Count() == 16))
{
tcs.SetResult(data.ToArray());
}
else
{
tcs.SetResult(null);
}
});
return(tcs.Task);
}
public async Task WriteAmiibo(NFCTagReaderSession session, INFCMiFareTag tag, DetectedAmiibo amiibo)
{
var dynamicLockBytes = new byte[] { 0x01, 0x00, 0x0F, 0xBD };
var staticLockBytes = new byte[] { 0x0F, 0xE0, 0x0F, 0xE0 };
var dump = amiibo.TagData;
// this is ille🚨al so i took it out, but the flow is:
// 1. make a copy of the tag dump
// 2. decrypt the encrypted part of the tag dump using the original tag uid and secret nintendo key material
// 3. reencrypt the now decrypted parts of the tag dump using the uid of the target tag and secret nintendo key material
// 4. write the tag dump (not the lock bits) to the tag
// 5. write the dynamic lock bits to 0x82
// 6. write the static lock bits to 0x2
// 7. draw the amiibo on the card for good luck
// check https://www.3dbrew.org/wiki/Amiibo for amiibo data structure
// check https://github.com/AcK77/AmiiBomb-uino for a good cloning reference
await Task.Yield();
session.AlertMessage = "Various implementation details removed and left to the reader (check the source).";
}