add factory reset

* init with alt pin

* chain code in pubkeys

android/src/main/java/im/status/keycard/android/NFCCardChannel.java

@@ -24,14 +24,25 @@ public class NFCCardChannel implements CardChannel {
   public APDUResponse send(APDUCommand cmd) throws IOException {
     byte[] apdu = cmd.serialize();
     Log.d(TAG, String.format("COMMAND CLA: %02X INS: %02X P1: %02X P2: %02X LC: %02X", cmd.getCla(), cmd.getIns(), cmd.getP1(), cmd.getP2(), cmd.getData().length));
-    byte[] resp = this.isoDep.transceive(apdu);
-    APDUResponse response = new APDUResponse(resp);
-    Log.d(TAG, String.format("RESPONSE LEN: %02X, SW: %04X %n-----------------------", response.getData().length, response.getSw()));
-    return response;
+    
+    try {
+      byte[] resp = this.isoDep.transceive(apdu);
+      APDUResponse response = new APDUResponse(resp);
+      Log.d(TAG, String.format("RESPONSE LEN: %02X, SW: %04X %n-----------------------", response.getData().length, response.getSw()));
+      return response;
+    } catch(SecurityException e) {
+      throw new IOException("Tag disconnected", e);
+    } catch(IllegalArgumentException e) {
+      throw new IOException("Malformed card response", e);
+    }
   }
 
   @Override
   public boolean isConnected() {
-    return this.isoDep.isConnected();
+    try {
+      return this.isoDep.isConnected();
+    } catch(SecurityException e) {
+      return false;
+    }
   }
 }

android/src/main/java/im/status/keycard/android/NFCCardManager.java

@@ -48,7 +48,11 @@ public class NFCCardManager extends Thread implements NfcAdapter.ReaderCallback
    * @return if connected, false otherwise
    */
   public boolean isConnected() {
-    return isoDep != null && isoDep.isConnected();
+    try {
+      return isoDep != null && isoDep.isConnected();
+    } catch (SecurityException e) {
+      return false;
+    }
   }
 
   @Override
@@ -58,7 +62,7 @@ public class NFCCardManager extends Thread implements NfcAdapter.ReaderCallback
       isoDep = IsoDep.get(tag);
       isoDep.connect();
       isoDep.setTimeout(120000);
-    } catch (IOException e) {
+    } catch (IOException | SecurityException e) {
       Log.e(TAG, "error connecting to tag");
     }
   }

lib/src/main/java/im/status/keycard/applet/ApplicationInfo.java

@@ -23,8 +23,9 @@ public class ApplicationInfo {
   static final byte CAPABILITY_KEY_MANAGEMENT = (byte) 0x02;
   static final byte CAPABILITY_CREDENTIALS_MANAGEMENT = (byte) 0x04;
   static final byte CAPABILITY_NDEF = (byte) 0x08;
+  static final byte CAPABILITY_FACTORY_RESET = (byte) 0x10;
 
-  static final byte CAPABILITIES_ALL = CAPABILITY_SECURE_CHANNEL | CAPABILITY_KEY_MANAGEMENT | CAPABILITY_CREDENTIALS_MANAGEMENT | CAPABILITY_NDEF;
+  static final byte CAPABILITIES_ALL = CAPABILITY_SECURE_CHANNEL | CAPABILITY_KEY_MANAGEMENT | CAPABILITY_CREDENTIALS_MANAGEMENT | CAPABILITY_NDEF | CAPABILITY_FACTORY_RESET;
 
   /**
    * Constructs an object by parsing the TLV data.
@@ -191,4 +192,13 @@ public class ApplicationInfo {
   public boolean hasNDEFCapability() {
     return (capabilities & CAPABILITY_NDEF) == CAPABILITY_NDEF;
   }
+
+  /**
+   * Returns true if the device supports the Factory Reset capability.
+   *
+   * @return true or false
+   */
+  public boolean hasFactoryResetCapability() {
+    return (capabilities & CAPABILITY_FACTORY_RESET) == CAPABILITY_FACTORY_RESET;
+  }  
 }

lib/src/main/java/im/status/keycard/applet/BIP32KeyPair.java

@@ -66,13 +66,13 @@ public class BIP32KeyPair {
       tlv.unreadLastTag();
       privKey = tlv.readPrimitive(TLV_PRIV_KEY);
       tag = tlv.readTag();
-
-      if (tag == TLV_CHAIN_CODE) {
-        tlv.unreadLastTag();
-        chainCode = tlv.readPrimitive(TLV_CHAIN_CODE);
-      }
     }
 
+    if (tag == TLV_CHAIN_CODE) {
+      tlv.unreadLastTag();
+      chainCode = tlv.readPrimitive(TLV_CHAIN_CODE);
+    }    
+
     return new BIP32KeyPair(privKey, chainCode, pubKey);
   }
 

lib/src/main/java/im/status/keycard/applet/KeycardCommandSet.java

@@ -18,6 +18,7 @@ import java.util.Arrays;
  */
 public class KeycardCommandSet {
   static final byte INS_INIT = (byte) 0xFE;
+  static final byte INS_FACTORY_RESET = (byte) 0xFD;
   static final byte INS_GET_STATUS = (byte) 0xF2;
   static final byte INS_SET_NDEF = (byte) 0xF3;
   static final byte INS_IDENTIFY_CARD = (byte) 0x14;
@@ -81,6 +82,9 @@ public class KeycardCommandSet {
   public static final byte EXPORT_KEY_P2_PUBLIC_ONLY = 0x01;
   public static final byte EXPORT_KEY_P2_EXTENDED_PUBLIC = 0x02;
 
+  static final byte FACTORY_RESET_P1_MAGIC = (byte) 0xAA;
+  static final byte FACTORY_RESET_P2_MAGIC = 0x55;
+
   static final byte TLV_APPLICATION_INFO_TEMPLATE = (byte) 0xA4;
 
   private final CardChannel apduChannel;
@@ -554,7 +558,7 @@ public class KeycardCommandSet {
    * @throws IOException communication error
    */
   public APDUResponse sign(byte[] data, int p1) throws IOException {
-    APDUCommand sign = secureChannel.protectedCommand(0x80, INS_SIGN, p1, 0x00, data);
+    APDUCommand sign = secureChannel.protectedCommand(0x80, INS_SIGN, p1, 0x01, data);
     return secureChannel.transmit(apduChannel, sign);
   }
 
@@ -815,9 +819,25 @@ public class KeycardCommandSet {
    * @throws IOException communication error
    */
   public APDUResponse init(String pin, String puk, String pairingPassword, byte pinRetries, byte pukRetries) throws IOException {
-    return this.init(pin, puk, pairingPasswordToSecret(pairingPassword), pinRetries, pukRetries);
+    return this.init(pin, null, puk, pairingPasswordToSecret(pairingPassword), pinRetries, pukRetries);
   }
 
+  /**
+   * Sends the INIT command to the card.
+   *
+   * @param pin the PIN
+   * @param altPin the alternative PIN
+   * @param puk the PUK
+   * @param pairingPassword pairing password
+   * @param pinRetries the number of allowed PIN retries
+   * @param pukRetries the number of allowed PUK retries
+   * @return the raw card response
+   * @throws IOException communication error
+   */
+  public APDUResponse init(String pin, String altPin, String puk, String pairingPassword, byte pinRetries, byte pukRetries) throws IOException {
+    return this.init(pin, altPin, puk, pairingPasswordToSecret(pairingPassword), pinRetries, pukRetries);
+  }  
+
   /**
    * Sends the INIT command to the card.
    *
@@ -828,13 +848,14 @@ public class KeycardCommandSet {
    * @throws IOException communication error
    */
   public APDUResponse init(String pin, String puk, byte[] sharedSecret) throws IOException {
-    return init(pin, puk, sharedSecret, (byte) 0, (byte) 0);
+    return init(pin, null, puk, sharedSecret, (byte) 0, (byte) 0);
   }
 
   /**
    * Sends the INIT command to the card. If either pinRetries or pukRetries is zero, neither will be sent.
    *
    * @param pin the PIN
+   * @param pin the alternative
    * @param puk the PUK
    * @param sharedSecret the shared secret for pairing
    * @param pinRetries the number of allowed PIN retries
@@ -842,18 +863,43 @@ public class KeycardCommandSet {
    * @return the raw card response
    * @throws IOException communication error
    */
-  public APDUResponse init(String pin, String puk, byte[] sharedSecret, byte pinRetries, byte pukRetries) throws IOException {
-    boolean addRetries = !((pinRetries == 0) || (pukRetries == 0));
-    byte[] initData = Arrays.copyOf(pin.getBytes(), pin.length() + puk.length() + sharedSecret.length + (addRetries ? 2 : 0));
+  public APDUResponse init(String pin, String altPin, String puk, byte[] sharedSecret, byte pinRetries, byte pukRetries) throws IOException {
+    int baselen = pin.length() + puk.length() + sharedSecret.length;
+    int extlen;
+
+    if (altPin != null) {
+      extlen = 2 + altPin.length();
+    } else if ((pinRetries != 0) || (pukRetries != 0)) {
+      extlen = 2;
+    } else {
+      extlen = 0;
+    }
+    
+    byte[] initData = Arrays.copyOf(pin.getBytes(), baselen + extlen);
     System.arraycopy(puk.getBytes(), 0, initData, pin.length(), puk.length());
     System.arraycopy(sharedSecret, 0, initData, pin.length() + puk.length(), sharedSecret.length);
 
-    if (addRetries) {
-      initData[initData.length - 2] = pinRetries;
-      initData[initData.length - 1] = pukRetries;
+    if (extlen > 0) {
+      initData[baselen] = pinRetries;
+      initData[baselen + 1] = pukRetries;
+
+      if (extlen > 2) {
+        System.arraycopy(altPin.getBytes(), 0, initData, baselen + 2, altPin.length());
+      }
     }
 
     APDUCommand init = new APDUCommand(0x80, INS_INIT, 0, 0, secureChannel.oneShotEncrypt(initData));
     return apduChannel.send(init);
   }
+  
+  /**
+   * Sends the FACTORY RESET command to the card.
+   *
+   * @return the raw card response
+   * @throws IOException communication error
+   */
+  public APDUResponse factoryReset() throws IOException {
+    APDUCommand factoryReset = new APDUCommand(0x80, INS_FACTORY_RESET, FACTORY_RESET_P1_MAGIC, FACTORY_RESET_P2_MAGIC, new byte[0]);
+    return apduChannel.send(factoryReset);
+  }  
 }

lib/src/main/java/im/status/keycard/applet/RecoverableSignature.java

@@ -23,6 +23,7 @@ public class RecoverableSignature {
   private boolean compressed;
 
   public static final byte TLV_SIGNATURE_TEMPLATE = (byte) 0xA0;
+  public static final byte TLV_RAW_SIGNATURE = (byte) 0x80;
   public static final byte TLV_ECDSA_TEMPLATE = (byte) 0x30;
 
   private static final X9ECParameters CURVE_PARAMS = CustomNamedCurves.getByName("secp256k1");
@@ -41,6 +42,19 @@ public class RecoverableSignature {
    */
   public RecoverableSignature(byte[] hash, byte[] tlvData) {
     TinyBERTLV tlv = new TinyBERTLV(tlvData);
+    int tag = tlv.readTag();
+    tlv.unreadLastTag();
+
+    if (tag == TLV_RAW_SIGNATURE) {
+      initFromRawSignature(hash, tlv.readPrimitive(tag));
+    } else if (tag == TLV_SIGNATURE_TEMPLATE) {
+      initFromLegacy(hash, tlv);
+    } else {
+      throw new IllegalArgumentException("invalid tlv");
+    }
+  }
+
+  private void initFromLegacy(byte[] hash, TinyBERTLV tlv) {
     tlv.enterConstructed(TLV_SIGNATURE_TEMPLATE);
     this.publicKey = tlv.readPrimitive(ApplicationInfo.TLV_PUB_KEY);
     tlv.enterConstructed(TLV_ECDSA_TEMPLATE);
@@ -51,6 +65,14 @@ public class RecoverableSignature {
     calculateRecID(hash);
   }
 
+  private void initFromRawSignature(byte[] hash, byte[] signature) {
+    this.r = Arrays.copyOfRange(signature, 0, 32);
+    this.s = Arrays.copyOfRange(signature, 32, 64);
+    this.recId = signature[64];
+    this.compressed = false;
+    this.publicKey = recoverFromSignature(this.recId, hash, this.r, this.s, this.compressed);
+  }
+
   public RecoverableSignature(byte[] publicKey, boolean compressed, byte[] r, byte[] s, int recId) {
     this.publicKey = publicKey;
     this.r = r;