Wallet: store key creation time. Calculate whole-wallet birthday.

This also encapsulate wallet-read state information into CWalletScanState.

4 files changed, 135 insertions, 38 deletions

diff --git a/src/wallet.cpp b/src/wallet.cpp
index 7041d49dab..aa13711110 100644
--- a/src/wallet.cpp
+++ b/src/wallet.cpp
@@ -45,20 +45,33 @@ CPubKey CWallet::GenerateNewKey()
     return pubkey;
 }
 
-bool CWallet::AddKeyPubKey(const CKey& secret, const CPubKey &pubkey)
+bool CWallet::AddKeyPubKey(const CKey& secret, const CPubKey &pubkey,
+                           int64 nCreateTime)
 {
+    if (!nCreateTime)
+        nCreateTime = GetTime();
+    if (!nTimeFirstKey || (nCreateTime < nTimeFirstKey))
+        nTimeFirstKey = nCreateTime;
     if (!CCryptoKeyStore::AddKeyPubKey(secret, pubkey))
         return false;
     if (!fFileBacked)
         return true;
     if (!IsCrypted()) {
-        return CWalletDB(strWalletFile).WriteKey(pubkey, secret.GetPrivKey());
+        return CWalletDB(strWalletFile).WriteKey(pubkey,
+                                                 secret.GetPrivKey(),
+                                                 nCreateTime);
     }
     return true;
 }
 
-bool CWallet::AddCryptedKey(const CPubKey &vchPubKey, const vector<unsigned char> &vchCryptedSecret)
+bool CWallet::AddCryptedKey(const CPubKey &vchPubKey,
+                            const vector<unsigned char> &vchCryptedSecret,
+                            int64 nCreateTime)
 {
+    if (!nCreateTime)
+        nCreateTime = GetTime();
+    if (!nTimeFirstKey || (nCreateTime < nTimeFirstKey))
+        nTimeFirstKey = nCreateTime;
     if (!CCryptoKeyStore::AddCryptedKey(vchPubKey, vchCryptedSecret))
         return false;
     if (!fFileBacked)
@@ -66,9 +79,13 @@ bool CWallet::AddCryptedKey(const CPubKey &vchPubKey, const vector<unsigned char
     {
         LOCK(cs_wallet);
         if (pwalletdbEncryption)
-            return pwalletdbEncryption->WriteCryptedKey(vchPubKey, vchCryptedSecret);
+            return pwalletdbEncryption->WriteCryptedKey(vchPubKey,
+                                                        vchCryptedSecret,
+                                                        nCreateTime);
         else
-            return CWalletDB(strWalletFile).WriteCryptedKey(vchPubKey, vchCryptedSecret);
+            return CWalletDB(strWalletFile).WriteCryptedKey(vchPubKey,
+                                                            vchCryptedSecret,
+                                                            nCreateTime);
     }
     return false;
 }
diff --git a/src/wallet.h b/src/wallet.h
index 674bae66dd..a0688b8a02 100644
--- a/src/wallet.h
+++ b/src/wallet.h
@@ -123,6 +123,8 @@ public:
 
     std::set<COutPoint> setLockedCoins;
 
+    int64 nTimeFirstKey;
+
     // check whether we are allowed to upgrade (or already support) to the named feature
     bool CanSupportFeature(enum WalletFeature wf) { return nWalletMaxVersion >= wf; }
 
@@ -138,14 +140,14 @@ public:
     // Generate a new key
     CPubKey GenerateNewKey();
     // Adds a key to the store, and saves it to disk.
-    bool AddKeyPubKey(const CKey& key, const CPubKey &pubkey);
+    bool AddKeyPubKey(const CKey& key, const CPubKey &pubkey, int64 nCreateTime = 0);
     // Adds a key to the store, without saving it to disk (used by LoadWallet)
     bool LoadKey(const CKey& key, const CPubKey &pubkey) { return CCryptoKeyStore::AddKeyPubKey(key, pubkey); }
 
     bool LoadMinVersion(int nVersion) { nWalletVersion = nVersion; nWalletMaxVersion = std::max(nWalletMaxVersion, nVersion); return true; }
 
     // Adds an encrypted key to the store, and saves it to disk.
-    bool AddCryptedKey(const CPubKey &vchPubKey, const std::vector<unsigned char> &vchCryptedSecret);
+    bool AddCryptedKey(const CPubKey &vchPubKey, const std::vector<unsigned char> &vchCryptedSecret, int64 nCreateTime = 0);
     // Adds an encrypted key to the store, without saving it to disk (used by LoadWallet)
     bool LoadCryptedKey(const CPubKey &vchPubKey, const std::vector<unsigned char> &vchCryptedSecret);
     bool AddCScript(const CScript& redeemScript);
diff --git a/src/walletdb.cpp b/src/walletdb.cpp
index 8910cac4bc..96fd4a5fc1 100644
--- a/src/walletdb.cpp
+++ b/src/walletdb.cpp
@@ -180,11 +180,27 @@ CWalletDB::ReorderTransactions(CWallet* pwallet)
     return DB_LOAD_OK;
 }
 
+class CWalletScanState {
+public:
+    unsigned int nKeys;
+    unsigned int nCKeys;
+    unsigned int nKeyMeta;
+    bool fIsEncrypted;
+    bool fAnyUnordered;
+    int nFileVersion;
+    vector<uint256> vWalletUpgrade;
+
+    CWalletScanState() {
+        nKeys = nCKeys = nKeyMeta = 0;
+        fIsEncrypted = false;
+        fAnyUnordered = false;
+        nFileVersion = 0;
+    }
+};
 
 bool
 ReadKeyValue(CWallet* pwallet, CDataStream& ssKey, CDataStream& ssValue,
-             int& nFileVersion, vector<uint256>& vWalletUpgrade,
-             bool& fIsEncrypted,  bool& fAnyUnordered, string& strType, string& strErr)
+             CWalletScanState &wss, string& strType, string& strErr)
 {
     try {
         // Unserialize
@@ -229,11 +245,11 @@ ReadKeyValue(CWallet* pwallet, CDataStream& ssKey, CDataStream& ssValue,
                     strErr = strprintf("LoadWallet() repairing tx ver=%d %s", wtx.fTimeReceivedIsTxTime, hash.ToString().c_str());
                     wtx.fTimeReceivedIsTxTime = 0;
                 }
-                vWalletUpgrade.push_back(hash);
+                wss.vWalletUpgrade.push_back(hash);
             }
 
             if (wtx.nOrderPos == -1)
-                fAnyUnordered = true;
+                wss.fAnyUnordered = true;
 
             //// debug print
             //printf("LoadWallet  %s\n", wtx.GetHash().ToString().c_str());
@@ -252,12 +268,12 @@ ReadKeyValue(CWallet* pwallet, CDataStream& ssKey, CDataStream& ssValue,
             if (nNumber > nAccountingEntryNumber)
                 nAccountingEntryNumber = nNumber;
 
-            if (!fAnyUnordered)
+            if (!wss.fAnyUnordered)
             {
                 CAccountingEntry acentry;
                 ssValue >> acentry;
                 if (acentry.nOrderPos == -1)
-                    fAnyUnordered = true;
+                    wss.fAnyUnordered = true;
             }
         }
         else if (strType == "key" || strType == "wkey")
@@ -272,8 +288,10 @@ ReadKeyValue(CWallet* pwallet, CDataStream& ssKey, CDataStream& ssValue,
             CKey key;
             CPrivKey pkey;
             if (strType == "key")
+            {
+                wss.nKeys++;
                 ssValue >> pkey;
-            else {
+            } else {
                 CWalletKey wkey;
                 ssValue >> wkey;
                 pkey = wkey.vchPrivKey;
@@ -315,12 +333,27 @@ ReadKeyValue(CWallet* pwallet, CDataStream& ssKey, CDataStream& ssValue,
             ssKey >> vchPubKey;
             vector<unsigned char> vchPrivKey;
             ssValue >> vchPrivKey;
+            wss.nCKeys++;
+
             if (!pwallet->LoadCryptedKey(vchPubKey, vchPrivKey))
             {
                 strErr = "Error reading wallet database: LoadCryptedKey failed";
                 return false;
             }
-            fIsEncrypted = true;
+            wss.fIsEncrypted = true;
+        }
+        else if (strType == "keymeta")
+        {
+            vector<unsigned char> vchPubKey;
+            ssKey >> vchPubKey;
+            CKeyMetadata keyMeta;
+            ssValue >> keyMeta;
+            wss.nKeyMeta++;
+
+            // find earliest key creation time, as wallet birthday
+            if (!pwallet->nTimeFirstKey ||
+                (keyMeta.nCreateTime < pwallet->nTimeFirstKey))
+                pwallet->nTimeFirstKey = keyMeta.nCreateTime;
         }
         else if (strType == "defaultkey")
         {
@@ -334,9 +367,9 @@ ReadKeyValue(CWallet* pwallet, CDataStream& ssKey, CDataStream& ssValue,
         }
         else if (strType == "version")
         {
-            ssValue >> nFileVersion;
-            if (nFileVersion == 10300)
-                nFileVersion = 300;
+            ssValue >> wss.nFileVersion;
+            if (wss.nFileVersion == 10300)
+                wss.nFileVersion = 300;
         }
         else if (strType == "cscript")
         {
@@ -370,10 +403,7 @@ static bool IsKeyType(string strType)
 DBErrors CWalletDB::LoadWallet(CWallet* pwallet)
 {
     pwallet->vchDefaultKey = CPubKey();
-    int nFileVersion = 0;
-    vector<uint256> vWalletUpgrade;
-    bool fIsEncrypted = false;
-    bool fAnyUnordered = false;
+    CWalletScanState wss;
     bool fNoncriticalErrors = false;
     DBErrors result = DB_LOAD_OK;
 
@@ -411,8 +441,7 @@ DBErrors CWalletDB::LoadWallet(CWallet* pwallet)
 
             // Try to be tolerant of single corrupt records:
             string strType, strErr;
-            if (!ReadKeyValue(pwallet, ssKey, ssValue, nFileVersion,
-                              vWalletUpgrade, fIsEncrypted, fAnyUnordered, strType, strErr))
+            if (!ReadKeyValue(pwallet, ssKey, ssValue, wss, strType, strErr))
             {
                 // losing keys is considered a catastrophic error, anything else
                 // we assume the user can live with:
@@ -447,19 +476,26 @@ DBErrors CWalletDB::LoadWallet(CWallet* pwallet)
     if (result != DB_LOAD_OK)
         return result;
 
-    printf("nFileVersion = %d\n", nFileVersion);
+    printf("nFileVersion = %d\n", wss.nFileVersion);
 
-    BOOST_FOREACH(uint256 hash, vWalletUpgrade)
+    printf("Keys: %u plaintext, %u encrypted, %u w/ metadata, %u total\n",
+           wss.nKeys, wss.nCKeys, wss.nKeyMeta, wss.nKeys + wss.nCKeys);
+
+    // nTimeFirstKey is only reliable if all keys have metadata
+    if ((wss.nKeys + wss.nCKeys) != wss.nKeyMeta)
+        pwallet->nTimeFirstKey = 0;
+
+    BOOST_FOREACH(uint256 hash, wss.vWalletUpgrade)
         WriteTx(hash, pwallet->mapWallet[hash]);
 
     // Rewrite encrypted wallets of versions 0.4.0 and 0.5.0rc:
-    if (fIsEncrypted && (nFileVersion == 40000 || nFileVersion == 50000))
+    if (wss.fIsEncrypted && (wss.nFileVersion == 40000 || wss.nFileVersion == 50000))
         return DB_NEED_REWRITE;
 
-    if (nFileVersion < CLIENT_VERSION) // Update
+    if (wss.nFileVersion < CLIENT_VERSION) // Update
         WriteVersion(CLIENT_VERSION);
 
-    if (fAnyUnordered)
+    if (wss.fAnyUnordered)
         result = ReorderTransactions(pwallet);
 
     return result;
@@ -615,10 +651,7 @@ bool CWalletDB::Recover(CDBEnv& dbenv, std::string filename, bool fOnlyKeys)
         return false;
     }
     CWallet dummyWallet;
-    int nFileVersion = 0;
-    vector<uint256> vWalletUpgrade;
-    bool fIsEncrypted = false;
-    bool fAnyUnordered = false;
+    CWalletScanState wss;
 
     DbTxn* ptxn = dbenv.TxnBegin();
     BOOST_FOREACH(CDBEnv::KeyValPair& row, salvagedData)
@@ -629,9 +662,7 @@ bool CWalletDB::Recover(CDBEnv& dbenv, std::string filename, bool fOnlyKeys)
             CDataStream ssValue(row.second, SER_DISK, CLIENT_VERSION);
             string strType, strErr;
             bool fReadOK = ReadKeyValue(&dummyWallet, ssKey, ssValue,
-                                        nFileVersion, vWalletUpgrade,
-                                        fIsEncrypted, fAnyUnordered,
-                                        strType, strErr);
+                                        wss, strType, strErr);
             if (!IsKeyType(strType))
                 continue;
             if (!fReadOK)
diff --git a/src/walletdb.h b/src/walletdb.h
index 9732eb29e4..287361b33d 100644
--- a/src/walletdb.h
+++ b/src/walletdb.h
@@ -25,6 +25,37 @@ enum DBErrors
     DB_NEED_REWRITE
 };
 
+class CKeyMetadata
+{
+public:
+    static const int CURRENT_VERSION=1;
+    int nVersion;
+    int64 nCreateTime;
+
+    CKeyMetadata()
+    {
+        SetNull();
+    }
+    CKeyMetadata(int64 nCreateTime_)
+    {
+        nVersion = CKeyMetadata::CURRENT_VERSION;
+        nCreateTime = nCreateTime_;
+    }
+
+    IMPLEMENT_SERIALIZE
+    (
+        READWRITE(this->nVersion);
+        nVersion = this->nVersion;
+        READWRITE(nCreateTime);
+    )
+
+    void SetNull()
+    {
+        nVersion = CKeyMetadata::CURRENT_VERSION;
+        nCreateTime = GetTime();
+    }
+};
+
 /** Access to the wallet database (wallet.dat) */
 class CWalletDB : public CDB
 {
@@ -52,15 +83,31 @@ public:
         return Erase(std::make_pair(std::string("tx"), hash));
     }
 
-    bool WriteKey(const CPubKey& vchPubKey, const CPrivKey& vchPrivKey)
+    bool WriteKey(const CPubKey& vchPubKey, const CPrivKey& vchPrivKey,
+                  int64 nCreateTime)
     {
         nWalletDBUpdated++;
+
+        CKeyMetadata keyMeta(nCreateTime);
+        if (!Write(std::make_pair(std::string("keymeta"), vchPubKey),
+                   keyMeta, false))
+            return false;
+
         return Write(std::make_pair(std::string("key"), vchPubKey), vchPrivKey, false);
     }
 
-    bool WriteCryptedKey(const CPubKey& vchPubKey, const std::vector<unsigned char>& vchCryptedSecret, bool fEraseUnencryptedKey = true)
+    bool WriteCryptedKey(const CPubKey& vchPubKey,
+                         const std::vector<unsigned char>& vchCryptedSecret,
+                         int64 nCreateTime)
     {
+        const bool fEraseUnencryptedKey = true;
         nWalletDBUpdated++;
+
+        CKeyMetadata keyMeta(nCreateTime);
+        if (!Write(std::make_pair(std::string("keymeta"), vchPubKey),
+                   keyMeta, false))
+            return false;
+
         if (!Write(std::make_pair(std::string("ckey"), vchPubKey), vchCryptedSecret, false))
             return false;
         if (fEraseUnencryptedKey)