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whisper: PoW calculations as specified in EIP-627 (#19753) 

* whisper: PoW calculations as specified in EIP-627

* Fix unit tests
This commit is contained in:
Guillaume Ballet 2019-06-25 12:01:34 +02:00 committed by GitHub
parent 2ca89ea479
commit 54fd263b40
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
2 changed files with 14 additions and 13 deletions
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21
whisper/whisperv6/envelope.go
View File

@ -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))

6
whisper/whisperv6/envelope_test.go
View File

@ -43,12 +43,12 @@ func TestPoWCalculationsWith8LeadingZeros(t *testing.T) {
e := Envelope{
TTL: 1,
Data: []byte{0xde, 0xad, 0xbe, 0xef},
Nonce: 48159,
Nonce: 276,
}
e.calculatePoW(0)
if e.pow != 40329.846153846156 {
t.Fatalf("invalid PoW calculation. Expected 0.07692307692307693, got %v", e.pow)
if e.pow != 19.692307692307693 {
t.Fatalf("invalid PoW calculation. Expected 19.692307692307693, got %v", e.pow)
}
}