add factory reset

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

@@ -32,6 +32,8 @@ public class NFCCardChannel implements CardChannel {
       return response;
     } catch(SecurityException e) {
       throw new IOException("Tag disconnected", e);
+    } catch(IllegalArgumentException e) {
+      throw new IOException("Malformed card response", e);
     }
   }
 

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/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;
@@ -887,4 +891,15 @@ public class KeycardCommandSet {
     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);
+  }  
 }