Mismatch of types: void and return.

[novacoin.git] / src / kernel.cpp

diff --git a/src/kernel.cpp b/src/kernel.cpp
index 42d18f4..58a4b88 100644 (file)
--- a/src/kernel.cpp
+++ b/src/kernel.cpp
@@ -28,15 +28,10 @@ typedef std::map<int, unsigned int> MapModifierCheckpoints;
 static std::map<int, unsigned int> mapStakeModifierCheckpoints =
     boost::assign::map_list_of
         ( 0, 0x0e00670bu )
-        ( 9690, 0x97dcdafau )
         ( 12661, 0x5d84115du )
-        ( 37092, 0xd230afccu )
-        ( 44200, 0x05370164u )
-        ( 65000, 0xc8e7be6au )
-        ( 68600, 0x73a8cc4cu )
-        ( 92161, 0xe21a911au )
-        ( 98661, 0xd20c44d4u )
         (143990, 0x9c592c78u )
+        (149000, 0x48f2bdc4u )
+        (160000, 0x789df0f0u )
     ;
 
 // Hard checkpoints of stake modifiers to ensure they are deterministic (testNet)
@@ -440,7 +435,7 @@ bool CheckStakeKernelHash(uint32_t nBits, const CBlock& blockFrom, uint32_t nTxP
 }
 
 // Scan given coins set for kernel solution
-bool ScanForStakeKernelHash(MetaMap &mapMeta, KernelSearchSettings &settings, CoinsSet::value_type &kernelcoin, uint32_t &nTimeTx, uint32_t &nBlockTime, uint64_t &nKernelsTried, uint64_t &nCoinDaysTried)
+bool ScanForStakeKernelHash(MetaMap &mapMeta, uint32_t nBits, uint32_t nTime, uint32_t nSearchInterval, CoinsSet::value_type &kernelcoin, uint32_t &nTimeTx, uint32_t &nBlockTime, uint64_t &nKernelsTried, uint64_t &nCoinDaysTried)
 {
     uint256 hashProofOfStake = 0;
 
@@ -457,29 +452,29 @@ bool ScanForStakeKernelHash(MetaMap &mapMeta, KernelSearchSettings &settings, Co
         // Get coin
         CoinsSet::value_type pcoin = meta_item->second.first.second;
 
-        static int nMaxStakeSearchInterval = 60;
+        static unsigned int nMaxStakeSearchInterval = 60;
 
         // only count coins meeting min age requirement
-        if (nStakeMinAge + block.nTime > settings.nTime - nMaxStakeSearchInterval)
+        if (nStakeMinAge + block.nTime > nTime - nMaxStakeSearchInterval)
             continue;
 
         // Transaction offset inside block
         uint32_t nTxOffset = txindex.pos.nTxPos - txindex.pos.nBlockPos;
 
         // Current timestamp scanning interval
-        unsigned int nCurrentSearchInterval = min((int64_t)settings.nSearchInterval, (int64_t)nMaxStakeSearchInterval);
+        unsigned int nCurrentSearchInterval = min(nSearchInterval, nMaxStakeSearchInterval);
 
         nBlockTime = block.nTime;
         CBigNum bnTargetPerCoinDay;
-        bnTargetPerCoinDay.SetCompact(settings.nBits);
+        bnTargetPerCoinDay.SetCompact(nBits);
         int64_t nValueIn = pcoin.first->vout[pcoin.second].nValue;
 
-        // Search backward in time from the given timestamp 
+        // Search backward in time from the given timestamp
         // Search nSearchInterval seconds back up to nMaxStakeSearchInterval
         // Stopping search in case of shutting down or cache invalidation
         for (unsigned int n=0; n<nCurrentSearchInterval && fCoinsDataActual && !fShutdown; n++)
         {
-            nTimeTx = settings.nTime - n;
+            nTimeTx = nTime - n;
             CBigNum bnCoinDayWeight = CBigNum(nValueIn) * GetWeight((int64_t)pcoin.first->nTime, (int64_t)nTimeTx) / COIN / (24 * 60 * 60);
             CBigNum bnTargetProofOfStake = bnCoinDayWeight * bnTargetPerCoinDay;
 
@@ -514,6 +509,68 @@ bool ScanForStakeKernelHash(MetaMap &mapMeta, KernelSearchSettings &settings, Co
     return false;
 }
 
+// Precompute hashing state for static part of kernel
+void GetKernelMidstate(uint64_t nStakeModifier, uint32_t nBlockTime, uint32_t nTxOffset, uint32_t nInputTxTime, uint32_t nOut, SHA256_CTX &ctx)
+{
+    // Build static part of kernel
+    CDataStream ssKernel(SER_GETHASH, 0);
+    ssKernel << nStakeModifier;
+    ssKernel << nBlockTime << nTxOffset << nInputTxTime << nOut;
+    CDataStream::const_iterator it = ssKernel.begin();
+
+    // Init sha256 context and update it 
+    //   with first 24 bytes of kernel
+    SHA256_Init(&ctx);
+    SHA256_Update(&ctx, (unsigned char*)&it[0], 8 + 16);
+}
+
+// Scan given midstate for solution
+bool ScanMidstateForward(SHA256_CTX &ctx, uint32_t nBits, uint32_t nInputTxTime, int64_t nValueIn, std::pair<uint32_t, uint32_t> &SearchInterval, std::pair<uint256, uint32_t> &solution)
+{
+    CBigNum bnTargetPerCoinDay;
+    bnTargetPerCoinDay.SetCompact(nBits);
+
+    // Get maximum possible target to filter out the majority of obviously insufficient hashes
+    CBigNum bnMaxTargetPerCoinDay = bnTargetPerCoinDay * CBigNum(nValueIn) * nStakeMaxAge / COIN / (24 * 60 * 60);
+    uint256 maxTarget = bnMaxTargetPerCoinDay.getuint256();
+
+    SHA256_CTX ctxCopy = ctx;
+
+    // Search forward in time from the given timestamp
+    // Stopping search in case of shutting down
+    for (uint32_t nTimeTx=SearchInterval.first; nTimeTx<SearchInterval.second && !fShutdown; nTimeTx++)
+    {
+        // Complete first hashing iteration
+        uint256 hash1;
+        SHA256_Update(&ctxCopy, (unsigned char*)&nTimeTx, 4);
+        SHA256_Final((unsigned char*)&hash1, &ctxCopy);
+
+        // Restore context
+        ctxCopy = ctx;
+
+        // Finally, calculate kernel hash
+        uint256 hashProofOfStake;
+        SHA256((unsigned char*)&hash1, sizeof(hashProofOfStake), (unsigned char*)&hashProofOfStake);
+
+        // Skip if hash doesn't satisfy the maximum target
+        if (hashProofOfStake > maxTarget)
+            continue;
+
+        CBigNum bnCoinDayWeight = CBigNum(nValueIn) * GetWeight((int64_t)nInputTxTime, (int64_t)nTimeTx) / COIN / (24 * 60 * 60);
+        CBigNum bnTargetProofOfStake = bnCoinDayWeight * bnTargetPerCoinDay;
+
+        if (bnTargetProofOfStake >= CBigNum(hashProofOfStake))
+        {
+            solution.first = hashProofOfStake;
+            solution.second = nTimeTx;
+
+            return true;
+        }
+    }
+
+    return false;
+}
+
 // Check kernel hash target and coinstake signature
 bool CheckProofOfStake(const CTransaction& tx, unsigned int nBits, uint256& hashProofOfStake, uint256& targetProofOfStake)
 {
@@ -560,7 +617,7 @@ uint32_t GetStakeModifierChecksum(const CBlockIndex* pindex)
     ss << pindex->nFlags << pindex->hashProofOfStake << pindex->nStakeModifier;
     uint256 hashChecksum = Hash(ss.begin(), ss.end());
     hashChecksum >>= (256 - 32);
-    return hashChecksum.Get64();
+    return static_cast<uint32_t>(hashChecksum.Get64());
 }
 
 // Check stake modifier hard checkpoints