Make setNDEF backward compatible to the 2.x style (#19)

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

@@ -19,6 +19,7 @@ import java.util.Arrays;
 public class KeycardCommandSet {
   static final byte INS_INIT = (byte) 0xFE;
   static final byte INS_GET_STATUS = (byte) 0xF2;
+  static final byte INS_SET_NDEF = (byte) 0xF3;
   static final byte INS_VERIFY_PIN = (byte) 0x20;
   static final byte INS_CHANGE_PIN = (byte) 0x21;
   static final byte INS_UNBLOCK_PIN = (byte) 0x22;
@@ -683,15 +684,20 @@ public class KeycardCommandSet {
    * @throws IOException communication error
    */
   public APDUResponse setNDEF(byte[] ndef) throws IOException {
-    if ((ndef.length - 2) != ((ndef[0] << 8) | ndef[1])) {
-      byte[] tmp = new byte[ndef.length + 2];
-      tmp[0] = (byte) (ndef.length >> 8);
-      tmp[1] = (byte) (ndef.length & 0xff);
-      System.arraycopy(ndef, 0, tmp, 2, ndef.length);
-      ndef = tmp;
-    }
+    if ((info.getAppVersion() >> 8) > 2) {
+      if ((ndef.length - 2) != ((ndef[0] << 8) | ndef[1])) {
+        byte[] tmp = new byte[ndef.length + 2];
+        tmp[0] = (byte) (ndef.length >> 8);
+        tmp[1] = (byte) (ndef.length & 0xff);
+        System.arraycopy(ndef, 0, tmp, 2, ndef.length);
+        ndef = tmp;
+      }
 
-    return storeData(ndef, STORE_DATA_P1_NDEF);
+      return storeData(ndef, STORE_DATA_P1_NDEF);
+    } else {
+      APDUCommand setNDEF = secureChannel.protectedCommand(0x80, INS_SET_NDEF, 0, 0, ndef);
+      return secureChannel.transmit(apduChannel, setNDEF);
+    }
   }
 
    /**

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

@@ -41,28 +41,11 @@ public class Mnemonic {
   }
 
   /**
-   * Retrieves the official BIP39 english wordlist from GitHub.
+   * Returns the official BIP39 english wordlist as fetched from https://raw.githubusercontent.com/bitcoin/bips/master/bip-0039/english.txt on 23 Oct 2019.
    *
-   * @throws IOException network error
    */
-  public void fetchBIP39EnglishWordlist() throws IOException {
-    URL remoteList = new URL("https://raw.githubusercontent.com/bitcoin/bips/master/bip-0039/english.txt");
-    Scanner scanner = new Scanner(remoteList.openStream());
-
-    ArrayList<String> list = new ArrayList<>();
-
-    while(scanner.hasNextLine()) {
-      list.add(scanner.nextLine());
-    }
-
-    scanner.close();
-
-    if (list.size() != WORDLIST_SIZE) {
-      throw new IllegalArgumentException("The list must contain exactly 2048 entries");
-    }
-
-    this.wordlist = new String[WORDLIST_SIZE];
-    list.toArray(this.wordlist);
+  public void fetchBIP39EnglishWordlist() {
+    this.wordlist = MnemonicEnglishDictionary.words;
   }
 
   /**