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core: fix PrevHash calculation for MPTRoot

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This was differing from C# notion of PrevHash. It's not a previous root, but
rather a hash of the previous serialized MPTRoot structure (that is to be
signed by CNs).

Signed-off-by: Evgenii Stratonikov <evgeniy@nspcc.ru>
This commit is contained in:
Roman Khimov 2020-06-04 17:19:30 +03:00 committed by Evgenii Stratonikov
parent caea6d6ca8
commit 58b7e16e0e
1 changed files with 3 additions and 2 deletions
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5
pkg/core/blockchain.go
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@ -17,6 +17,7 @@ import (
"github.com/nspcc-dev/neo-go/pkg/core/state"
"github.com/nspcc-dev/neo-go/pkg/core/storage"
"github.com/nspcc-dev/neo-go/pkg/core/transaction"
"github.com/nspcc-dev/neo-go/pkg/crypto/hash"
"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
"github.com/nspcc-dev/neo-go/pkg/encoding/bigint"
"github.com/nspcc-dev/neo-go/pkg/io"
@ -648,7 +649,7 @@ func (bc *Blockchain) storeBlock(block *block.Block) error {
if err != nil {
return errors.WithMessagef(err, "can't get previous state root")
}
prevHash = prev.Root
prevHash = hash.DoubleSha256(prev.GetSignedPart())
}
err := bc.AddStateRoot(&state.MPTRoot{
MPTRootBase: state.MPTRootBase{
@ -1264,7 +1265,7 @@ func (bc *Blockchain) verifyStateRoot(r *state.MPTRoot) error {
prev, err := bc.GetStateRoot(r.Index - 1)
if err != nil {
return errors.New("can't get previous state root")
} else if !prev.Root.Equals(r.PrevHash) {
} else if !r.PrevHash.Equals(hash.DoubleSha256(prev.GetSignedPart())) {
return errors.New("previous hash mismatch")
} else if prev.Version != r.Version {
return errors.New("version mismatch")