From f528f99d4c6b0293a7f0e9078949ee8e373c9e8b Mon Sep 17 00:00:00 2001
From: lateminer <late-miner@ya.ru>
Date: Tue, 2 Jan 2018 12:48:57 +0300
Subject: [PATCH] [Wallet] Add HD xpriv to dumpwallet

https://github.com/bitcoin/bitcoin/pull/8206/commits/77c912d21c8cd153f4503c65225a5a46990cc85a
---
 src/wallet/rpcdump.cpp | 30 +++++++++++++++++++++++++++---
 1 file changed, 27 insertions(+), 3 deletions(-)

diff --git a/src/wallet/rpcdump.cpp b/src/wallet/rpcdump.cpp
index b025c3745..716da3c1e 100644
--- a/src/wallet/rpcdump.cpp
+++ b/src/wallet/rpcdump.cpp
@@ -490,19 +490,43 @@ UniValue dumpwallet(const UniValue& params, bool fHelp)
     file << strprintf("# * Best block at time of backup was %i (%s),\n", chainActive.Height(), chainActive.Tip()->GetBlockHash().ToString());
     file << strprintf("#   mined on %s\n", EncodeDumpTime(chainActive.Tip()->GetBlockTime()));
     file << "\n";
+
+    // add the base58check encoded extended master if the wallet uses HD 
+    CKeyID masterKeyID = pwalletMain->GetHDChain().masterKeyID;
+    if (!masterKeyID.IsNull())
+    {
+        CKey key;
+        if (pwalletMain->GetKey(masterKeyID, key))
+        {
+            CExtKey masterKey;
+            masterKey.SetMaster(key.begin(), key.size());
+
+            CBitcoinExtKey b58extkey;
+            b58extkey.SetKey(masterKey);
+
+            file << "# extended private masterkey: " << b58extkey.ToString() << "\n\n";
+        }
+    }
+
     for (std::vector<std::pair<int64_t, CKeyID> >::const_iterator it = vKeyBirth.begin(); it != vKeyBirth.end(); it++) {
         const CKeyID &keyid = it->second;
         std::string strTime = EncodeDumpTime(it->first);
         std::string strAddr = CBitcoinAddress(keyid).ToString();
         CKey key;
         if (pwalletMain->GetKey(keyid, key)) {
+            file << strprintf("%s %s ", CBitcoinSecret(key).ToString(), strTime);
             if (pwalletMain->mapAddressBook.count(keyid)) {
-                file << strprintf("%s %s label=%s # addr=%s\n", CBitcoinSecret(key).ToString(), strTime, EncodeDumpString(pwalletMain->mapAddressBook[keyid].name), strAddr);
+                file << strprintf("label=%s", EncodeDumpString(pwalletMain->mapAddressBook[keyid].name));
+            } else if (keyid == masterKeyID) {
+                file << "hdmaster=1";
             } else if (setKeyPool.count(keyid)) {
-                file << strprintf("%s %s reserve=1 # addr=%s\n", CBitcoinSecret(key).ToString(), strTime, strAddr);
+                file << "reserve=1";
+            } else if (pwalletMain->mapKeyMetadata[keyid].hdKeypath == "m") {
+                file << "inactivehdmaster=1";
             } else {
-                file << strprintf("%s %s change=1 # addr=%s\n", CBitcoinSecret(key).ToString(), strTime, strAddr);
+                file << "change=1";
             }
+            file << strprintf(" # addr=%s%s\n", strAddr, (pwalletMain->mapKeyMetadata[keyid].hdKeypath.size() > 0 ? " hdkeypath="+pwalletMain->mapKeyMetadata[keyid].hdKeypath : ""));
         }
     }
     file << "\n";