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Add support for writing to PowerTags. #30
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92 changes: 92 additions & 0 deletions
92
app/src/main/java/com/hiddenramblings/tagmo/ptag/PTagKeyManager.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,92 @@ | ||
| package com.hiddenramblings.tagmo.ptag; | ||
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| import android.content.Context; | ||
| import android.content.res.AssetManager; | ||
| import android.util.Base64; | ||
| import android.util.Log; | ||
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| import com.hiddenramblings.tagmo.Util; | ||
| import com.hiddenramblings.tagmo.amiibo.AmiiboManager; | ||
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| import org.json.JSONException; | ||
| import org.json.JSONObject; | ||
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| import java.io.IOException; | ||
| import java.io.InputStream; | ||
| import java.nio.charset.Charset; | ||
| import java.util.HashMap; | ||
| import java.util.Hashtable; | ||
| import java.util.Iterator; | ||
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| public class PTagKeyManager { | ||
| private static final String TAG = "PTagKeyManager"; | ||
| public static final String KEY_LIST_FILE = "keytable.json"; | ||
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| private static HashMap<String, HashMap<String, byte[]>> keys; | ||
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| public static void load(Context context) throws Exception { | ||
| if (keys != null) | ||
| return; | ||
| AssetManager assetManager = context.getAssets(); | ||
| InputStream stream = assetManager.open(KEY_LIST_FILE); | ||
| try { | ||
| byte[] data = new byte[stream.available()]; | ||
| stream.read(data); | ||
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| JSONObject obj = new JSONObject(new String(data)); | ||
| loadJson(obj); | ||
| } finally { | ||
| stream.close(); | ||
| } | ||
| } | ||
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| static void loadJson(JSONObject json) throws JSONException { | ||
| HashMap<String, HashMap<String, byte[]>> keytable = new HashMap<>(); | ||
| for (Iterator uidIterator = json.keys(); uidIterator.hasNext(); ) { | ||
| String uid = (String) uidIterator.next(); | ||
| JSONObject pageKeys = json.getJSONObject(uid); | ||
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| HashMap<String, byte[]> keyvalues = new HashMap<String, byte[]>(); | ||
| keytable.put(uid, keyvalues); | ||
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| for (Iterator pageByteIterator = pageKeys.keys(); pageByteIterator.hasNext(); ) { | ||
| String pageBytes = (String) pageByteIterator.next(); | ||
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| String keyStr = pageKeys.getString(pageBytes); | ||
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| byte[] key = Base64.decode(keyStr, Base64.DEFAULT); | ||
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| keyvalues.put(pageBytes, key); | ||
| } | ||
| } | ||
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| keys = keytable; | ||
| } | ||
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| public static byte[] getKey(byte[] uid, String page10bytes) throws Exception { | ||
| if (keys == null) | ||
| throw new Exception("PowerTag keys not loaded"); | ||
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| byte[] uidc = new byte[7]; | ||
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| uidc[0] = (byte)(uid[0] & 0xFE); | ||
| uidc[1] = (byte)(uid[1] & 0xFE); | ||
| uidc[2] = (byte)(uid[2] & 0xFE); | ||
| uidc[3] = (byte)(uid[3] & 0xFE); | ||
| uidc[4] = (byte)(uid[4] & 0xFE); | ||
| uidc[5] = (byte)(uid[5] & 0xFE); | ||
| uidc[6] = (byte)(uid[6] & 0xFE); | ||
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| String uidStr = Util.bytesToHex(uidc); | ||
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| HashMap<String, byte[]> keymap = keys.get(uidStr); | ||
| if (keymap == null) | ||
| throw new Exception("No available key for UID"); | ||
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| byte[] key = keymap.get(page10bytes); | ||
| if (key == null) | ||
| throw new Exception("No available key for P10_ID"); | ||
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| return key; | ||
| } | ||
| } |
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