forks/go-ethereum
1
0
Fork 1
mirror of https://github.com/ethereum/go-ethereum.git synced 2026-08-19 10:22:23 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions

David/verify headers (#13)

Browse source 
* Updated verifyheader logic for Aura

* Fixed errors returned and comments
This commit is contained in:
David Ansermino 2018-09-08 08:07:48 -06:00 committed by Dustin Brickwood
parent d30a22bfa5
commit 69f2029dbe
1 changed files with 19 additions and 26 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

45
consensus/aura/aura.go
View file

@ -92,6 +92,10 @@ var (
// their extra-data fields.
errExtraSigners = errors.New("non-checkpoint block contains extra signer list")
// errInvalidValidatorSeal is returned if the extra data field length is not
// equal to the length of a seal
errInvalidExtraData = errors.New("extra data field in block header is invalid")
// errInvalidCheckpointSigners is returned if a checkpoint block contains an
// invalid list of signers (i.e. non divisible by 20 bytes, or not the correct
// ones).
@ -267,32 +271,21 @@ func (a *Aura) verifyHeader(chain consensus.ChainReader, header *types.Header, p
if header.Time.Cmp(big.NewInt(time.Now().Unix())) > 0 {
return consensus.ErrFutureBlock
}
// TODO: Are any of these necessary checks?
// Checkpoint blocks need to enforce zero beneficiary
checkpoint := (number % a.config.Epoch) == 0
if checkpoint && header.Coinbase != (common.Address{}) {
return errInvalidCheckpointBeneficiary
}
//checkpoint := (number % a.config.Epoch) == 0
//if checkpoint && header.Coinbase != (common.Address{}) {
// return errInvalidCheckpointBeneficiary
//}
// Nonces must be 0x00..0 or 0xff..f, zeroes enforced on checkpoints
if !bytes.Equal(header.Nonce[:], nonceAuthVote) && !bytes.Equal(header.Nonce[:], nonceDropVote) {
return errInvalidVote
}
if checkpoint && !bytes.Equal(header.Nonce[:], nonceDropVote) {
return errInvalidCheckpointVote
}
// Check that the extra-data contains both the vanity and signature
if len(header.Extra) < extraVanity {
return errMissingVanity
}
if len(header.Extra) < extraVanity+extraSeal {
return errMissingSignature
}
// Ensure that the extra-data contains a signer list on checkpoint, but none otherwise
signersBytes := len(header.Extra) - extraVanity - extraSeal
if !checkpoint && signersBytes != 0 {
return errExtraSigners
}
if checkpoint && signersBytes%common.AddressLength != 0 {
return errInvalidCheckpointSigners
//if !bytes.Equal(header.Nonce[:], nonceAuthVote) && !bytes.Equal(header.Nonce[:], nonceDropVote) {
// return errInvalidVote
//}
// Ensure that the extra-data contains a single signature
signersBytes := len(header.Extra) - extraSeal
if signersBytes != 0 {
return errInvalidExtraData
}
// Ensure that the mix digest is zero as we don't have fork protection currently
if header.MixDigest != (common.Hash{}) {
@ -302,9 +295,9 @@ func (a *Aura) verifyHeader(chain consensus.ChainReader, header *types.Header, p
if header.UncleHash != uncleHash {
return errInvalidUncleHash
}
// Ensure that the block's difficulty is meaningful (may not be correct at this point)
// Ensure that the block's difficulty is correct (it should be constant)
if number > 0 {
if header.Difficulty == nil || (header.Difficulty.Cmp(diffInTurn) != 0 && header.Difficulty.Cmp(diffNoTurn) != 0) {
if header.Difficulty != chain.Config().Difficulty {
return errInvalidDifficulty
}
}