forked from cerc-io/plugeth
whisper: PoW calculations as specified in EIP-627 (#19753)
* whisper: PoW calculations as specified in EIP-627 * Fix unit tests
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@ -91,16 +91,18 @@ func (e *Envelope) Seal(options *MessageParams) error {
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target = e.powToFirstBit(options.PoW)
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}
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buf := make([]byte, 64)
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h := crypto.Keccak256(e.rlpWithoutNonce())
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copy(buf[:32], h)
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rlp := e.rlpWithoutNonce()
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buf := make([]byte, len(rlp)+8)
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copy(buf, rlp)
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asAnInt := new(big.Int)
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finish := time.Now().Add(time.Duration(options.WorkTime) * time.Second).UnixNano()
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for nonce := uint64(0); time.Now().UnixNano() < finish; {
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for i := 0; i < 1024; i++ {
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binary.BigEndian.PutUint64(buf[56:], nonce)
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d := new(big.Int).SetBytes(crypto.Keccak256(buf))
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leadingZeros := 256 - d.BitLen()
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binary.BigEndian.PutUint64(buf[len(rlp):], nonce)
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h := crypto.Keccak256(buf)
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asAnInt.SetBytes(h)
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leadingZeros := 256 - asAnInt.BitLen()
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if leadingZeros > bestLeadingZeros {
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e.Nonce, bestLeadingZeros = nonce, leadingZeros
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if target > 0 && bestLeadingZeros >= target {
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@ -128,11 +130,10 @@ func (e *Envelope) PoW() float64 {
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}
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func (e *Envelope) calculatePoW(diff uint32) {
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buf := make([]byte, 64)
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rlp := e.rlpWithoutNonce()
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h := crypto.Keccak256(rlp)
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copy(buf[:32], h)
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binary.BigEndian.PutUint64(buf[56:], e.Nonce)
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buf := make([]byte, len(rlp)+8)
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copy(buf, rlp)
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binary.BigEndian.PutUint64(buf[len(rlp):], e.Nonce)
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powHash := new(big.Int).SetBytes(crypto.Keccak256(buf))
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leadingZeroes := 256 - powHash.BitLen()
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x := gmath.Pow(2, float64(leadingZeroes))
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@ -43,12 +43,12 @@ func TestPoWCalculationsWith8LeadingZeros(t *testing.T) {
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e := Envelope{
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TTL: 1,
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Data: []byte{0xde, 0xad, 0xbe, 0xef},
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Nonce: 48159,
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Nonce: 276,
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}
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e.calculatePoW(0)
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if e.pow != 40329.846153846156 {
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t.Fatalf("invalid PoW calculation. Expected 0.07692307692307693, got %v", e.pow)
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if e.pow != 19.692307692307693 {
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t.Fatalf("invalid PoW calculation. Expected 19.692307692307693, got %v", e.pow)
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}
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}
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