Refactor keytime/metadata and wallet encryption bugfix

Refactor keytime:
* Key metadata is kept in a CWallet::mapKeyMetadata (std::map<CKeyId,CKeyMetadata>).
* When generating a new key, time is put in that map, and new key is written.
* AddKeyPubKey and AddCryptedKey do not take a creation time argument, but instead
  pull it from that map, if it exists there.

Bugfix:
* AddKeyPubKey and AddCryptedKey in CWallet didn't override the CKeyStore
  definition anymore. This is fixed, as they no longed need the nCreationTime
  argument now.

Also a few related other changes:
* Metadata can be overwritten.
* Only GenerateNewKey calls GetTime(), as it's the only place where we know for
  sure a key was not constructed earlier.
* When the nTimeFirstKey is known to be inaccurate, it is set to the value 1
  (instead of 0, which would mean unknown).
* Use CPubKey instead of std::vector<unsigned char> where possible.

1 files changed, 21 insertions, 15 deletions

diff --git a/src/wallet.cpp b/src/wallet.cpp
index 4cd04bb6e2..1087db632d 100644
--- a/src/wallet.cpp
+++ b/src/wallet.cpp
@@ -40,18 +40,20 @@ CPubKey CWallet::GenerateNewKey()
         SetMinVersion(FEATURE_COMPRPUBKEY);
 
     CPubKey pubkey = secret.GetPubKey();
+
+    // Create new metadata
+    int64 nCreationTime = GetTime();
+    mapKeyMetadata[pubkey.GetID()] = CKeyMetadata(nCreationTime);
+    if (!nTimeFirstKey || nCreationTime < nTimeFirstKey)
+        nTimeFirstKey = nCreationTime;
+
     if (!AddKeyPubKey(secret, pubkey))
         throw std::runtime_error("CWallet::GenerateNewKey() : AddKey failed");
     return pubkey;
 }
 
-bool CWallet::AddKeyPubKey(const CKey& secret, const CPubKey &pubkey,
-                           int64 nCreateTime)
+bool CWallet::AddKeyPubKey(const CKey& secret, const CPubKey &pubkey)
 {
-    if (!nCreateTime)
-        nCreateTime = GetTime();
-    if (!nTimeFirstKey || (nCreateTime < nTimeFirstKey))
-        nTimeFirstKey = nCreateTime;
     if (!CCryptoKeyStore::AddKeyPubKey(secret, pubkey))
         return false;
     if (!fFileBacked)
@@ -59,19 +61,14 @@ bool CWallet::AddKeyPubKey(const CKey& secret, const CPubKey &pubkey,
     if (!IsCrypted()) {
         return CWalletDB(strWalletFile).WriteKey(pubkey,
                                                  secret.GetPrivKey(),
-                                                 nCreateTime);
+                                                 mapKeyMetadata[pubkey.GetID()]);
     }
     return true;
 }
 
 bool CWallet::AddCryptedKey(const CPubKey &vchPubKey,
-                            const vector<unsigned char> &vchCryptedSecret,
-                            int64 nCreateTime)
+                            const vector<unsigned char> &vchCryptedSecret)
 {
-    if (!nCreateTime)
-        nCreateTime = GetTime();
-    if (!nTimeFirstKey || (nCreateTime < nTimeFirstKey))
-        nTimeFirstKey = nCreateTime;
     if (!CCryptoKeyStore::AddCryptedKey(vchPubKey, vchCryptedSecret))
         return false;
     if (!fFileBacked)
@@ -81,15 +78,24 @@ bool CWallet::AddCryptedKey(const CPubKey &vchPubKey,
         if (pwalletdbEncryption)
             return pwalletdbEncryption->WriteCryptedKey(vchPubKey,
                                                         vchCryptedSecret,
-                                                        nCreateTime);
+                                                        mapKeyMetadata[vchPubKey.GetID()]);
         else
             return CWalletDB(strWalletFile).WriteCryptedKey(vchPubKey,
                                                             vchCryptedSecret,
-                                                            nCreateTime);
+                                                            mapKeyMetadata[vchPubKey.GetID()]);
     }
     return false;
 }
 
+bool CWallet::LoadKeyMetadata(const CPubKey &pubkey, const CKeyMetadata &meta)
+{
+    if (meta.nCreateTime && (!nTimeFirstKey || meta.nCreateTime < nTimeFirstKey))
+        nTimeFirstKey = meta.nCreateTime;
+
+    mapKeyMetadata[pubkey.GetID()] = meta;
+    return true;
+}
+
 bool CWallet::LoadCryptedKey(const CPubKey &vchPubKey, const std::vector<unsigned char> &vchCryptedSecret)
 {
     return CCryptoKeyStore::AddCryptedKey(vchPubKey, vchCryptedSecret);