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blockchain_go
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Simplify 'target'

This commit is contained in:
Ivan Kuznetsov 2017-08-22 17:26:12 +07:00
parent f94bbb4451
commit d379fdeae2
1 changed files with 6 additions and 10 deletions
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16
proofofwork.go
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@ -12,22 +12,18 @@ var (
maxNonce = math.MaxInt64 maxNonce = math.MaxInt64
) )
const targetBits = 12 const targetBits = 24 // 3 bytes
// ProofOfWork represents a proof-of-work // ProofOfWork represents a proof-of-work
type ProofOfWork struct { type ProofOfWork struct {
block *Block block *Block
target big.Int target *big.Int
} }
// NewProofOfWork builds and returns a ProofOfWork // NewProofOfWork builds and returns a ProofOfWork
func NewProofOfWork(b *Block) *ProofOfWork { func NewProofOfWork(b *Block) *ProofOfWork {
targetBytes := make([]byte, 32) target := big.NewInt(1)
target := big.Int{} target.Lsh(target, uint(256-targetBits))
numOfZeros := targetBits / 4
targetBytes[numOfZeros-1] = 1
target.SetBytes(targetBytes)
pow := &ProofOfWork{b, target} pow := &ProofOfWork{b, target}
@ -63,7 +59,7 @@ func (pow *ProofOfWork) Run() (int, []byte) {
fmt.Printf("\r%x", hash) fmt.Printf("\r%x", hash)
hashInt.SetBytes(hash[:]) hashInt.SetBytes(hash[:])
if hashInt.Cmp(&pow.target) == -1 { if hashInt.Cmp(pow.target) == -1 {
break break
} else { } else {
nonce++ nonce++
@ -82,7 +78,7 @@ func (pow *ProofOfWork) ConfirmProof() bool {
hash := sha256.Sum256(data) hash := sha256.Sum256(data)
hashInt.SetBytes(hash[:]) hashInt.SetBytes(hash[:])
confirmation := hashInt.Cmp(&pow.target) == -1 confirmation := hashInt.Cmp(pow.target) == -1
return confirmation return confirmation
} }