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whisper: PoW calculations as specified in EIP-627

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This commit is contained in:
Guillaume Ballet 2019-06-24 17:31:05 +02:00
parent 1da5e0ebb0
commit 9a3a82737b
1 changed files with 11 additions and 10 deletions
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21
whisper/whisperv6/envelope.go
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@ -91,16 +91,18 @@ func (e *Envelope) Seal(options *MessageParams) error {
target = e.powToFirstBit(options.PoW)
}
buf := make([]byte, 64)
h := crypto.Keccak256(e.rlpWithoutNonce())
copy(buf[:32], h)
rlp := e.rlpWithoutNonce()
buf := make([]byte, len(rlp)+8)
copy(buf, rlp)
asAnInt := new(big.Int)
finish := time.Now().Add(time.Duration(options.WorkTime) * time.Second).UnixNano()
for nonce := uint64(0); time.Now().UnixNano() < finish; {
for i := 0; i < 1024; i++ {
binary.BigEndian.PutUint64(buf[56:], nonce)
d := new(big.Int).SetBytes(crypto.Keccak256(buf))
leadingZeros := 256 - d.BitLen()
binary.BigEndian.PutUint64(buf[len(rlp):], nonce)
h := crypto.Keccak256(buf)
asAnInt.SetBytes(h)
leadingZeros := 256 - asAnInt.BitLen()
if leadingZeros > bestLeadingZeros {
e.Nonce, bestLeadingZeros = nonce, leadingZeros
if target > 0 && bestLeadingZeros >= target {
@ -128,11 +130,10 @@ func (e *Envelope) PoW() float64 {
}
func (e *Envelope) calculatePoW(diff uint32) {
buf := make([]byte, 64)
rlp := e.rlpWithoutNonce()
h := crypto.Keccak256(rlp)
copy(buf[:32], h)
binary.BigEndian.PutUint64(buf[56:], e.Nonce)
buf := make([]byte, len(rlp)+8)
copy(buf, rlp)
binary.BigEndian.PutUint64(buf[len(rlp):], e.Nonce)
powHash := new(big.Int).SetBytes(crypto.Keccak256(buf))
leadingZeroes := 256 - powHash.BitLen()
x := gmath.Pow(2, float64(leadingZeroes))