support export chain code

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

@@ -66,12 +66,12 @@ 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

@@ -815,25 +815,9 @@ 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, null, puk, pairingPasswordToSecret(pairingPassword), pinRetries, pukRetries);
+    return this.init(pin, 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.
    *
@@ -844,14 +828,13 @@ public class KeycardCommandSet {
    * @throws IOException communication error
    */
   public APDUResponse init(String pin, String puk, byte[] sharedSecret) throws IOException {
-    return init(pin, null, puk, sharedSecret, (byte) 0, (byte) 0);
+    return init(pin, 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
@@ -859,29 +842,15 @@ public class KeycardCommandSet {
    * @return the raw card response
    * @throws IOException communication error
    */
-  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);
+  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));
     System.arraycopy(puk.getBytes(), 0, initData, pin.length(), puk.length());
     System.arraycopy(sharedSecret, 0, initData, pin.length() + puk.length(), sharedSecret.length);
 
-    if (extlen > 0) {
-      initData[baselen] = pinRetries;
-      initData[baselen + 1] = pukRetries;
-
-      if (extlen > 2) {
-        System.arraycopy(altPin.getBytes(), 0, initData, baselen + 2, altPin.length());
-      }
+    if (addRetries) {
+      initData[initData.length - 2] = pinRetries;
+      initData[initData.length - 1] = pukRetries;
     }
 
     APDUCommand init = new APDUCommand(0x80, INS_INIT, 0, 0, secureChannel.oneShotEncrypt(initData));