[0.13] Create a new HD seed after encrypting the wallet

src/wallet/rpcwallet.cpp

@@ -2081,7 +2081,7 @@ UniValue encryptwallet(const UniValue& params, bool fHelp)
     // slack space in .dat files; that is bad if the old data is
     // unencrypted private keys. So:
     StartShutdown();
-    return "wallet encrypted; Bitcoin server stopping, restart to run with encrypted wallet. The keypool has been flushed, you need to make a new backup.";
+    return "wallet encrypted; Bitcoin server stopping, restart to run with encrypted wallet. The keypool has been flushed and a new HD seed was generated (if you are using HD). You need to make a new backup.";
 }
 
 UniValue lockunspent(const UniValue& params, bool fHelp)

src/wallet/wallet.cpp

@@ -626,6 +626,15 @@ bool CWallet::EncryptWallet(const SecureString& strWalletPassphrase)
 
         Lock();
         Unlock(strWalletPassphrase);
+
+        // if we are using HD, replace the HD master key with a new one
+        if (!hdChain.masterKeyID.IsNull()) {
+            CKey key;
+            key.MakeNewKey(true);
+            if (!SetHDMasterKey(key))
+                return false;
+        }
+
         NewKeyPool();
         Lock();