Merge #8035: [Wallet] Add simplest BIP32/deterministic key generation implementation

afcd77e Detect -usehd mismatches when wallet.dat already exists (Jonas Schnelli)
17c0131 [Docs] Add release notes and bip update for Bip32/HD wallets (Jonas Schnelli)
c022e5b [Wallet] use constant for bip32 hardened key limit (Jonas Schnelli)
f190251 [Wallet] Add simplest BIP32/deterministic key generation implementation (Jonas Schnelli)

src/wallet/wallet.h

@@ -57,6 +57,9 @@ static const unsigned int DEFAULT_TX_CONFIRM_TARGET = 2;
 static const unsigned int MAX_FREE_TRANSACTION_CREATE_SIZE = 1000;
 static const bool DEFAULT_WALLETBROADCAST = true;
 
+//! if set, all keys will be derived by using BIP32
+static const bool DEFAULT_USE_HD_WALLET = true;
+
 extern const char * DEFAULT_WALLET_DAT;
 
 class CBlockIndex;
@@ -574,6 +577,9 @@ private:
 
     void SyncMetaData(std::pair<TxSpends::iterator, TxSpends::iterator>);
 
+    /* the hd chain data model (external chain counters) */
+    CHDChain hdChain;
+
 public:
     /*
      * Main wallet lock.
@@ -889,6 +895,12 @@ public:
     static bool ParameterInteraction();
 
     bool BackupWallet(const std::string& strDest);
+
+    /* Set the hd chain model (chain child index counters) */
+    bool SetHDChain(const CHDChain& chain, bool memonly);
+
+    /* Set the current hd master key (will reset the chain child index counters) */
+    bool SetHDMasterKey(const CKey& key);
 };
 
 /** A key allocated from the key pool. */