HD Wallets: add getImportedKeys() method that returns just the basic key chain.

core/src/main/java/com/google/bitcoin/core/Wallet.java

@@ -358,6 +358,18 @@ public class Wallet extends BaseTaggableObject implements Serializable, BlockCha
         }
     }
 
+    /**
+     * Returns a list of the non-deterministic keys that have been imported into the wallet, or the empty list if none.
+     */
+    public List<ECKey> getImportedKeys() {
+        lock.lock();
+        try {
+            return keychain.getImportedKeys();
+        } finally {
+            lock.unlock();
+        }
+    }
+
     /** Returns the address used for change outputs. Note: this will probably go away in future. */
     public Address getChangeAddress() {
         return currentKey(KeyChain.KeyPurpose.CHANGE).toAddress(params);

core/src/main/java/com/google/bitcoin/wallet/KeyChainGroup.java

@@ -276,6 +276,13 @@ public class KeyChainGroup {
     /** Returns the key crypter or null if the group is not encrypted. */
     @Nullable public KeyCrypter getKeyCrypter() { return keyCrypter; }
 
+    /**
+     * Returns a list of the non-deterministic keys that have been imported into the wallet, or the empty list if none.
+     */
+    public List<ECKey> getImportedKeys() {
+        return basic.getKeys();
+    }
+
     public long getEarliestKeyCreationTime() {
         long time = basic.getEarliestKeyCreationTime();   // Long.MAX_VALUE if empty.
         for (DeterministicKeyChain chain : chains)

core/src/test/java/com/google/bitcoin/core/WalletTest.java

@@ -1417,6 +1417,8 @@ public class WalletTest extends TestWithWallet {
     public void importAndEncrypt() throws IOException, InsufficientMoneyException {
         final ECKey key = new ECKey();
         encryptedWallet.importKeysAndEncrypt(ImmutableList.of(key), PASSWORD1);
+        assertEquals(1, encryptedWallet.getImportedKeys().size());
+        assertEquals(key.getPubKeyPoint(), encryptedWallet.getImportedKeys().get(0).getPubKeyPoint());
         sendMoneyToWallet(encryptedWallet, Utils.COIN, key.toAddress(params), AbstractBlockChain.NewBlockType.BEST_CHAIN);
         assertEquals(Utils.COIN, encryptedWallet.getBalance());
         SendRequest req = Wallet.SendRequest.emptyWallet(new ECKey().toAddress(params));