Merge #10115: Avoid reading the old hd master key during wallet encryption

185c7f0 Avoid reading the old hd master key during wallet encryption (Matt Corallo)

Tree-SHA512: b744e8490c0e948355bb77b2695902bb99f89a68af46aa2be9120bd2ccf3c340eb8a56340fec117f9a935192298028945c9b18120ee6b8b23e7da8ffdb635745

Author: laanwj

src/wallet/wallet.cpp

@@ -621,12 +621,9 @@ bool CWallet::EncryptWallet(const SecureString& strWalletPassphrase)
 
         // if we are using HD, replace the HD master key (seed) with a new one
         if (IsHDEnabled()) {
-            CKey key;
-            CPubKey masterPubKey = GenerateNewHDMasterKey();
-            // preserve the old chains version to not break backward compatibility
-            CHDChain oldChain = GetHDChain();
-            if (!SetHDMasterKey(masterPubKey, &oldChain))
+            if (!SetHDMasterKey(GenerateNewHDMasterKey())) {
                 return false;
+            }
         }
 
         NewKeyPool();
@@ -1324,17 +1321,14 @@ CPubKey CWallet::GenerateNewHDMasterKey()
     return pubkey;
 }
 
-bool CWallet::SetHDMasterKey(const CPubKey& pubkey, CHDChain *possibleOldChain)
+bool CWallet::SetHDMasterKey(const CPubKey& pubkey)
 {
     LOCK(cs_wallet);
     // store the keyid (hash160) together with
     // the child index counter in the database
     // as a hdchain object
     CHDChain newHdChain;
-    if (possibleOldChain) {
-        // preserve the old chains version
-        newHdChain.nVersion = possibleOldChain->nVersion;
-    }
+    newHdChain.nVersion = CanSupportFeature(FEATURE_HD_SPLIT) ? CHDChain::VERSION_HD_CHAIN_SPLIT : CHDChain::VERSION_HD_BASE;
     newHdChain.masterKeyID = pubkey.GetID();
     SetHDChain(newHdChain, false);
 

src/wallet/wallet.h

@@ -1100,9 +1100,10 @@ class CWallet : public CCryptoKeyStore, public CValidationInterface
     CPubKey GenerateNewHDMasterKey();
 
     /* Set the current HD master key (will reset the chain child index counters)
-       If possibleOldChain is provided, the parameters from the old chain (version)
-       will be preserved. */
-    bool SetHDMasterKey(const CPubKey& key, CHDChain *possibleOldChain = nullptr);
+       Sets the master key's version based on the current wallet version (so the
+       caller must ensure the current wallet version is correct before calling
+       this function). */
+    bool SetHDMasterKey(const CPubKey& key);
 };
 
 /** A key allocated from the key pool. */