Moved pow

pow/ezp/pow.go

@@ -0,0 +1,89 @@
+package ezp
+
+import (
+	"math/big"
+	"math/rand"
+	"time"
+
+	"github.com/ethereum/go-ethereum/crypto"
+	"github.com/ethereum/go-ethereum/ethutil"
+	"github.com/ethereum/go-ethereum/logger"
+	"github.com/ethereum/go-ethereum/pow"
+	"github.com/obscuren/sha3"
+)
+
+var powlogger = logger.NewLogger("POW")
+
+type EasyPow struct {
+	hash     *big.Int
+	HashRate int64
+	turbo    bool
+}
+
+func New() *EasyPow {
+	return &EasyPow{}
+}
+
+func (pow *EasyPow) GetHashrate() int64 {
+	return pow.HashRate
+}
+
+func (pow *EasyPow) Turbo(on bool) {
+	pow.turbo = on
+}
+
+func (pow *EasyPow) Search(block pow.Block, stop <-chan struct{}) []byte {
+	r := rand.New(rand.NewSource(time.Now().UnixNano()))
+	hash := block.HashNoNonce()
+	diff := block.Diff()
+	i := int64(0)
+	start := time.Now().UnixNano()
+	t := time.Now()
+
+	for {
+		select {
+		case <-stop:
+			powlogger.Infoln("Breaking from mining")
+			pow.HashRate = 0
+			return nil
+		default:
+			i++
+
+			if time.Since(t) > (1 * time.Second) {
+				elapsed := time.Now().UnixNano() - start
+				hashes := ((float64(1e9) / float64(elapsed)) * float64(i)) / 1000
+				pow.HashRate = int64(hashes)
+				powlogger.Infoln("Hashing @", pow.HashRate, "khash")
+
+				t = time.Now()
+			}
+
+			sha := crypto.Sha3(big.NewInt(r.Int63()).Bytes())
+			if pow.verify(hash, diff, sha) {
+				return sha
+			}
+		}
+
+		if !pow.turbo {
+			time.Sleep(20 * time.Microsecond)
+		}
+	}
+
+	return nil
+}
+
+func (pow *EasyPow) verify(hash []byte, diff *big.Int, nonce []byte) bool {
+	sha := sha3.NewKeccak256()
+
+	d := append(hash, nonce...)
+	sha.Write(d)
+
+	verification := new(big.Int).Div(ethutil.BigPow(2, 256), diff)
+	res := ethutil.U256(ethutil.BigD(sha.Sum(nil)))
+
+	return res.Cmp(verification) <= 0
+}
+
+func (pow *EasyPow) Verify(block pow.Block) bool {
+	return pow.verify(block.HashNoNonce(), block.Diff(), block.N())
+}