New stake miner

[novacoin.git] / src / kernel.h

diff --git a/src/kernel.h b/src/kernel.h
index e39c728..eca9744 100644 (file)
--- a/src/kernel.h
+++ b/src/kernel.h
@@ -7,14 +7,14 @@
 #include "main.h"
 #include "wallet.h"
 
+using namespace std;
+
 // ChainDB upgrade time
 extern unsigned int nModifierUpgradeTime;
 
 // MODIFIER_INTERVAL: time to elapse before new modifier is computed
 extern unsigned int nModifierInterval;
 
-extern bool fCoinsDataActual;
-
 // MODIFIER_INTERVAL_RATIO:
 // ratio of group interval length between the last group and the first group
 static const int MODIFIER_INTERVAL_RATIO = 3;
@@ -23,45 +23,44 @@ static const int MODIFIER_INTERVAL_RATIO = 3;
 bool IsFixedModifierInterval(unsigned int nTimeBlock);
 
 // Compute the hash modifier for proof-of-stake
-bool ComputeNextStakeModifier(const CBlockIndex* pindexCurrent, uint64& nStakeModifier, bool& fGeneratedStakeModifier);
+bool ComputeNextStakeModifier(const CBlockIndex* pindexCurrent, uint64_t& nStakeModifier, bool& fGeneratedStakeModifier);
 
 // The stake modifier used to hash for a stake kernel is chosen as the stake
 // modifier about a selection interval later than the coin generating the kernel
-bool GetKernelStakeModifier(uint256 hashBlockFrom, uint64& nStakeModifier);
+bool GetKernelStakeModifier(uint256 hashBlockFrom, uint64_t& nStakeModifier);
 
 // Check whether stake kernel meets hash target
 // Sets hashProofOfStake on success return
-bool CheckStakeKernelHash(unsigned int nBits, const CBlock& blockFrom, unsigned int nTxPrevOffset, const CTransaction& txPrev, const COutPoint& prevout, unsigned int nTimeTx, uint256& hashProofOfStake, uint256& targetProofOfStake, bool fPrintProofOfStake=false);
-
-// Coins scanning options
-typedef struct KernelSearchSettings {
-    unsigned int nBits;           // Packed difficulty
-    unsigned int nTime;           // Basic time
-    unsigned int nOffset;         // Offset inside CoinsSet (isn't used yet)
-    unsigned int nLimit;          // Coins to scan (isn't used yet)
-    unsigned int nSearchInterval; // Number of seconds allowed to go into the past
-} KernelSearchSettings;
+bool CheckStakeKernelHash(unsigned int nBits, const CBlock& blockFrom, uint32_t nTxPrevOffset, const CTransaction& txPrev, const COutPoint& prevout, uint32_t nTimeTx, uint256& hashProofOfStake, uint256& targetProofOfStake, bool fPrintProofOfStake=false);
 
-typedef std::set<std::pair<const CWalletTx*,unsigned int> > CoinsSet;
+// 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);
 
-// Preloaded coins metadata
-// txid => ((txindex, (tx, vout.n)), (block, modifier))
-typedef std::map<std::pair<uint256, unsigned int>, std::pair<std::pair<CTxIndex, std::pair<const CWalletTx*,unsigned int> >, std::pair<CBlock, uint64> > > MetaMap;
-
-// Scan given coins set for kernel solution
-bool ScanForStakeKernelHash(MetaMap &mapMeta, KernelSearchSettings &settings, CoinsSet::value_type &kernelcoin, unsigned int &nTimeTx, unsigned int &nBlockTime);
+// Scan given midstate for kernel solutions
+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);
+bool ScanMidstateBackward(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);
 
 // Check kernel hash target and coinstake signature
 // Sets hashProofOfStake on success return
 bool CheckProofOfStake(const CTransaction& tx, unsigned int nBits, uint256& hashProofOfStake, uint256& targetProofOfStake);
 
 // Get stake modifier checksum
-unsigned int GetStakeModifierChecksum(const CBlockIndex* pindex);
+uint32_t GetStakeModifierChecksum(const CBlockIndex* pindex);
 
 // Check stake modifier hard checkpoints
-bool CheckStakeModifierCheckpoints(int nHeight, unsigned int nStakeModifierChecksum);
+bool CheckStakeModifierCheckpoints(int nHeight, uint32_t nStakeModifierChecksum);
 
 // Get time weight using supplied timestamps
-int64 GetWeight(int64 nIntervalBeginning, int64 nIntervalEnd);
+inline int64_t GetWeight(int64_t nIntervalBeginning, int64_t nIntervalEnd)
+{
+    // Kernel hash weight starts from 0 at the 30-day min age
+    // this change increases active coins participating the hash and helps
+    // to secure the network when proof-of-stake difficulty is low
+    //
+    // Maximum TimeWeight is 90 days.
+
+    return min(nIntervalEnd - nIntervalBeginning - nStakeMinAge, (int64_t)nStakeMaxAge);
+}
+
 
 #endif // PPCOIN_KERNEL_H