wallet: Store HDSeed and chain data

src/wallet/wallet.h

@@ -23,6 +23,7 @@
 #include "wallet/walletdb.h"
 #include "wallet/rpcwallet.h"
 #include "zcash/Address.hpp"
+#include "zcash/zip32.h"
 #include "base58.h"
 
 #include <algorithm>
@@ -61,6 +62,9 @@ static const unsigned int MAX_FREE_TRANSACTION_CREATE_SIZE = 1000;
 //  unless there is some exceptional network disruption.
 static const unsigned int WITNESS_CACHE_SIZE = MAX_REORG_LENGTH + 1;
 
+//! Size of HD seed in bytes
+static const size_t HD_WALLET_SEED_LENGTH = 32;
+
 class CBlockIndex;
 class CCoinControl;
 class COutput;
@@ -823,6 +827,9 @@ protected:
     bool UpdatedNoteData(const CWalletTx& wtxIn, CWalletTx& wtx);
     void MarkAffectedTransactionsDirty(const CTransaction& tx);
 
+    /* the hd chain data model (chain counters) */
+    CHDChain hdChain;
+
 public:
     /*
      * Main wallet lock.
@@ -1222,6 +1229,27 @@ public:
     bool GetBroadcastTransactions() const { return fBroadcastTransactions; }
     /** Set whether this wallet broadcasts transactions. */
     void SetBroadcastTransactions(bool broadcast) { fBroadcastTransactions = broadcast; }
+
+    /* Returns true if HD is enabled for all address types, false if only for Sapling */
+    bool IsHDFullyEnabled() const;
+
+    /* Generates a new HD seed (will reset the chain child index counters)
+       Sets the seed's version based on the current wallet version (so the
+       caller must ensure the current wallet version is correct before calling
+       this function). */
+    void GenerateNewSeed();
+
+    bool SetHDSeed(const HDSeed& seed);
+    bool SetCryptedHDSeed(const uint256& seedFp, const std::vector<unsigned char> &vchCryptedSecret);
+
+    /* Set the HD chain model (chain child index counters) */
+    void SetHDChain(const CHDChain& chain, bool memonly);
+    const CHDChain& GetHDChain() const { return hdChain; }
+
+    /* Set the current HD seed, without saving it to disk (used by LoadWallet) */
+    bool LoadHDSeed(const HDSeed& key);
+    /* Set the current encrypted HD seed, without saving it to disk (used by LoadWallet) */
+    bool LoadCryptedHDSeed(const uint256& seedFp, const std::vector<unsigned char>& seed);
     
     /* Find notes filtered by payment address, min depth, ability to spend */
     void GetFilteredNotes(std::vector<CSproutNotePlaintextEntry>& sproutEntries,