PPCoin: Synchronized checkpoint accepting descendant blocks only

[novacoin.git] / src / checkpoints.h

diff --git a/src/checkpoints.h b/src/checkpoints.h
index 033b228..e90458e 100644 (file)
--- a/src/checkpoints.h
+++ b/src/checkpoints.h
@@ -16,6 +16,106 @@
 class uint256;
 class CBlockIndex;
 
+// ppcoin: synchronized checkpoint
+class CUnsignedSyncCheckpoint
+{
+public:
+    int nVersion;
+    uint256 hashCheckpoint;      // checkpoint block
+
+    IMPLEMENT_SERIALIZE
+    (
+        READWRITE(this->nVersion);
+        nVersion = this->nVersion;
+        READWRITE(hashCheckpoint);
+    )
+
+    void SetNull()
+    {
+        nVersion = 1;
+        hashCheckpoint = 0;
+    }
+
+    std::string ToString() const
+    {
+        return strprintf(
+                "CSyncCheckpoint(\n"
+                "    nVersion       = %d\n"
+                "    hashCheckpoint = %s\n"
+                ")\n",
+            nVersion,
+            hashCheckpoint.ToString().c_str());
+    }
+
+    void print() const
+    {
+        printf("%s", ToString().c_str());
+    }
+};
+
+class CSyncCheckpoint : public CUnsignedSyncCheckpoint
+{
+public:
+    std::vector<unsigned char> vchMsg;
+    std::vector<unsigned char> vchSig;
+
+    CSyncCheckpoint()
+    {
+        SetNull();
+    }
+
+    IMPLEMENT_SERIALIZE
+    (
+        READWRITE(vchMsg);
+        READWRITE(vchSig);
+    )
+
+    void SetNull()
+    {
+        CUnsignedSyncCheckpoint::SetNull();
+        vchMsg.clear();
+        vchSig.clear();
+    }
+
+    bool IsNull() const
+    {
+        return (hashCheckpoint == 0);
+    }
+
+    uint256 GetHash() const
+    {
+        return SerializeHash(*this);
+    }
+
+    bool RelayTo(CNode* pnode) const
+    {
+        // returns true if wasn't already sent
+        if (pnode->hashCheckpointKnown != hashCheckpoint)
+        {
+            pnode->hashCheckpointKnown = hashCheckpoint;
+            pnode->PushMessage("checkpoint", *this);
+            return true;
+        }
+        return false;
+    }
+
+    bool CheckSignature()
+    {
+        CKey key;
+        if (!key.SetPubKey(ParseHex("04ea21daea8c15559870b5e93750ddc2f0c16bd0cb16636ba88c0746cfac07912ec7ad14111cc4aedda12c2687c920c7b7b62fd67ca14eed53f2d1704ec72362ce")))
+            return error("CSyncCheckpoint::CheckSignature() : SetPubKey failed");
+        if (!key.Verify(Hash(vchMsg.begin(), vchMsg.end()), vchSig))
+            return error("CSyncCheckpoint::CheckSignature() : verify signature failed");
+
+        // Now unserialize the data
+        CDataStream sMsg(vchMsg);
+        sMsg >> *(CUnsignedSyncCheckpoint*)this;
+        return true;
+    }
+
+    bool ProcessSyncCheckpoint(CNode* pfrom);
+};
+
 //
 // Block-chain checkpoints are compiled-in sanity checks.
 // They are updated every release or three.
@@ -31,8 +131,13 @@ namespace Checkpoints
     // Returns last CBlockIndex* in mapBlockIndex that is a checkpoint
     CBlockIndex* GetLastCheckpoint(const std::map<uint256, CBlockIndex*>& mapBlockIndex);
 
-    // ppcoin: synchronized checkpoint
     extern uint256 hashSyncCheckpoint;
+    extern CSyncCheckpoint checkpointMessage;
+    extern CCriticalSection cs_hashSyncCheckpoint;
+
+    bool AcceptPendingSyncCheckpoint();
+    uint256 AutoSelectSyncCheckpoint();
+    bool CheckSync(const uint256& hashBlock, const CBlockIndex* pindexPrev);
 
     // ppcoin: automatic checkpoint
     extern int nAutoCheckpoint;