Merge #8323: Add HD keypath to CKeyMetadata, report metadata in validateaddress

7945088 [Wallet] comsetic non-code changes for the HD feature (Jonas Schnelli)
68d7682 [Wallet] ensure CKeyMetadata.hdMasterKeyID will be cleared during SetNull() (Jonas Schnelli)
f708085 [QA] extend wallet-hd test to cover HD metadata (Jonas Schnelli)
986c223 [Wallet] print hd masterkeyid in getwalletinfo (Jonas Schnelli)
b1c7b24 [Wallet] report optional HDKeypath/HDMasterKeyId in validateaddress (Jonas Schnelli)
5b95dd2 [Wallet] extend CKeyMetadata with HD keypath (Jonas Schnelli)

6 files changed, 43 insertions, 7 deletions

diff --git a/qa/rpc-tests/wallet-hd.py b/qa/rpc-tests/wallet-hd.py
index 845eec027b..c738ee2207 100755
--- a/qa/rpc-tests/wallet-hd.py
+++ b/qa/rpc-tests/wallet-hd.py
@@ -30,6 +30,10 @@ class WalletHDTest(BitcoinTestFramework):
     def run_test (self):
         tmpdir = self.options.tmpdir
 
+        # Make sure we use hd, keep masterkeyid
+        masterkeyid = self.nodes[1].getwalletinfo()['masterkeyid']
+        assert_equal(len(masterkeyid), 40)
+
         # Import a non-HD private key in the HD wallet
         non_hd_add = self.nodes[0].getnewaddress()
         self.nodes[1].importprivkey(self.nodes[0].dumpprivkey(non_hd_add))
@@ -43,8 +47,11 @@ class WalletHDTest(BitcoinTestFramework):
         self.nodes[0].generate(101)
         hd_add = None
         num_hd_adds = 300
-        for _ in range(num_hd_adds):
+        for i in range(num_hd_adds):
             hd_add = self.nodes[1].getnewaddress()
+            hd_info = self.nodes[1].validateaddress(hd_add)
+            assert_equal(hd_info["hdkeypath"], "m/0'/0'/"+str(i+1)+"'")
+            assert_equal(hd_info["hdmasterkeyid"], masterkeyid)
             self.nodes[0].sendtoaddress(hd_add, 1)
             self.nodes[0].generate(1)
         self.nodes[0].sendtoaddress(non_hd_add, 1)
@@ -64,6 +71,9 @@ class WalletHDTest(BitcoinTestFramework):
         hd_add_2 = None
         for _ in range(num_hd_adds):
             hd_add_2 = self.nodes[1].getnewaddress()
+            hd_info_2 = self.nodes[1].validateaddress(hd_add_2)
+            assert_equal(hd_info_2["hdkeypath"], "m/0'/0'/"+str(_+1)+"'")
+            assert_equal(hd_info_2["hdmasterkeyid"], masterkeyid)
         assert_equal(hd_add, hd_add_2)
 
         # Needs rescan
diff --git a/src/rpc/misc.cpp b/src/rpc/misc.cpp
index f2a29416e6..a8c5bcd177 100644
--- a/src/rpc/misc.cpp
+++ b/src/rpc/misc.cpp
@@ -166,6 +166,8 @@ UniValue validateaddress(const UniValue& params, bool fHelp)
             "  \"pubkey\" : \"publickeyhex\",    (string) The hex value of the raw public key\n"
             "  \"iscompressed\" : true|false,  (boolean) If the address is compressed\n"
             "  \"account\" : \"account\"         (string) DEPRECATED. The account associated with the address, \"\" is the default account\n"
+            "  \"hdkeypath\" : \"keypath\"       (string, optional) The HD keypath if the key is HD and available\n"
+            "  \"hdmasterkeyid\" : \"<hash160>\" (string, optional) The Hash160 of the HD master pubkey\n"
             "}\n"
             "\nExamples:\n"
             + HelpExampleCli("validateaddress", "\"1PSSGeFHDnKNxiEyFrD1wcEaHr9hrQDDWc\"")
@@ -200,6 +202,12 @@ UniValue validateaddress(const UniValue& params, bool fHelp)
         ret.pushKVs(detail);
         if (pwalletMain && pwalletMain->mapAddressBook.count(dest))
             ret.push_back(Pair("account", pwalletMain->mapAddressBook[dest].name));
+        CKeyID keyID;
+        if (pwalletMain && address.GetKeyID(keyID) && pwalletMain->mapKeyMetadata.count(keyID) && !pwalletMain->mapKeyMetadata[keyID].hdKeypath.empty())
+        {
+            ret.push_back(Pair("hdkeypath", pwalletMain->mapKeyMetadata[keyID].hdKeypath));
+            ret.push_back(Pair("hdmasterkeyid", pwalletMain->mapKeyMetadata[keyID].hdMasterKeyID.GetHex()));
+        }
 #endif
     }
     return ret;
diff --git a/src/wallet/rpcwallet.cpp b/src/wallet/rpcwallet.cpp
index 2747477fd9..b4831ad795 100644
--- a/src/wallet/rpcwallet.cpp
+++ b/src/wallet/rpcwallet.cpp
@@ -2269,6 +2269,7 @@ UniValue getwalletinfo(const UniValue& params, bool fHelp)
             "  \"keypoolsize\": xxxx,        (numeric) how many new keys are pre-generated\n"
             "  \"unlocked_until\": ttt,      (numeric) the timestamp in seconds since epoch (midnight Jan 1 1970 GMT) that the wallet is unlocked for transfers, or 0 if the wallet is locked\n"
             "  \"paytxfee\": x.xxxx,         (numeric) the transaction fee configuration, set in " + CURRENCY_UNIT + "/kB\n"
+            "  \"masterkeyid\": \"<hash160>\", (string) the Hash160 of the HD master pubkey\n"
             "}\n"
             "\nExamples:\n"
             + HelpExampleCli("getwalletinfo", "")
@@ -2288,6 +2289,9 @@ UniValue getwalletinfo(const UniValue& params, bool fHelp)
     if (pwalletMain->IsCrypted())
         obj.push_back(Pair("unlocked_until", nWalletUnlockTime));
     obj.push_back(Pair("paytxfee",      ValueFromAmount(payTxFee.GetFeePerK())));
+    CKeyID masterKeyID = pwalletMain->GetHDChain().masterKeyID;
+    if (!masterKeyID.IsNull())
+         obj.push_back(Pair("masterkeyid", masterKeyID.GetHex()));
     return obj;
 }
 
diff --git a/src/wallet/wallet.cpp b/src/wallet/wallet.cpp
index 7cb294bec1..46ed542158 100644
--- a/src/wallet/wallet.cpp
+++ b/src/wallet/wallet.cpp
@@ -126,6 +126,8 @@ CPubKey CWallet::GenerateNewKey()
             // childIndex | BIP32_HARDENED_KEY_LIMIT = derive childIndex in hardened child-index-range
             // example: 1 | BIP32_HARDENED_KEY_LIMIT == 0x80000001 == 2147483649
             externalChainChildKey.Derive(childKey, hdChain.nExternalChainCounter | BIP32_HARDENED_KEY_LIMIT);
+            metadata.hdKeypath     = "m/0'/0'/"+std::to_string(hdChain.nExternalChainCounter)+"'";
+            metadata.hdMasterKeyID = hdChain.masterKeyID;
             // increment childkey index
             hdChain.nExternalChainCounter++;
         } while(HaveKey(childKey.key.GetPubKey().GetID()));
diff --git a/src/wallet/wallet.h b/src/wallet/wallet.h
index 7fc6ce5de5..e9d669a7d1 100644
--- a/src/wallet/wallet.h
+++ b/src/wallet/wallet.h
@@ -577,7 +577,7 @@ private:
 
     void SyncMetaData(std::pair<TxSpends::iterator, TxSpends::iterator>);
 
-    /* the hd chain data model (external chain counters) */
+    /* the HD chain data model (external chain counters) */
     CHDChain hdChain;
 
 public:
@@ -896,11 +896,12 @@ public:
 
     bool BackupWallet(const std::string& strDest);
 
-    /* Set the hd chain model (chain child index counters) */
+    /* 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) */
+    /* Set the current HD master key (will reset the chain child index counters) */
     bool SetHDMasterKey(const CKey& key);
+    const CHDChain& GetHDChain() { return hdChain; }
 };
 
 /** A key allocated from the key pool. */
diff --git a/src/wallet/walletdb.h b/src/wallet/walletdb.h
index d083722dd2..5addd5c5c0 100644
--- a/src/wallet/walletdb.h
+++ b/src/wallet/walletdb.h
@@ -41,7 +41,7 @@ enum DBErrors
     DB_NEED_REWRITE
 };
 
-/* simple hd chain data model */
+/* simple HD chain data model */
 class CHDChain
 {
 public:
@@ -73,9 +73,13 @@ public:
 class CKeyMetadata
 {
 public:
-    static const int CURRENT_VERSION=1;
+    static const int VERSION_BASIC=1;
+    static const int VERSION_WITH_HDDATA=10;
+    static const int CURRENT_VERSION=VERSION_WITH_HDDATA;
     int nVersion;
     int64_t nCreateTime; // 0 means unknown
+    std::string hdKeypath; //optional HD/bip32 keypath
+    CKeyID hdMasterKeyID; //id of the HD masterkey used to derive this key
 
     CKeyMetadata()
     {
@@ -83,7 +87,7 @@ public:
     }
     CKeyMetadata(int64_t nCreateTime_)
     {
-        nVersion = CKeyMetadata::CURRENT_VERSION;
+        SetNull();
         nCreateTime = nCreateTime_;
     }
 
@@ -94,12 +98,19 @@ public:
         READWRITE(this->nVersion);
         nVersion = this->nVersion;
         READWRITE(nCreateTime);
+        if (this->nVersion >= VERSION_WITH_HDDATA)
+        {
+            READWRITE(hdKeypath);
+            READWRITE(hdMasterKeyID);
+        }
     }
 
     void SetNull()
     {
         nVersion = CKeyMetadata::CURRENT_VERSION;
         nCreateTime = 0;
+        hdKeypath.clear();
+        hdMasterKeyID.SetNull();
     }
 };