prysm-pulse/beacon-chain/state/stateutil/block_header_root.go
Raul Jordan 45bfd82c88
Add Encoding SSZ Package (#9630)
* ssz package

* compile

* htrutils

* rem pkg doc

* fix cloners_test.go

* fix circular dep/build issues

Co-authored-by: prestonvanloon <preston@prysmaticlabs.com>
Co-authored-by: prylabs-bulldozer[bot] <58059840+prylabs-bulldozer[bot]@users.noreply.github.com>
2021-09-21 15:02:48 +00:00

35 lines
1.3 KiB
Go

package stateutil
import (
"encoding/binary"
"github.com/prysmaticlabs/prysm/crypto/hash"
"github.com/prysmaticlabs/prysm/encoding/ssz"
ethpb "github.com/prysmaticlabs/prysm/proto/prysm/v1alpha1"
"github.com/prysmaticlabs/prysm/shared/bytesutil"
)
// BlockHeaderRoot computes the HashTreeRoot Merkleization of
// a BeaconBlockHeader struct according to the Ethereum
// Simple Serialize specification.
func BlockHeaderRoot(header *ethpb.BeaconBlockHeader) ([32]byte, error) {
fieldRoots := make([][]byte, 5)
if header != nil {
headerSlotBuf := make([]byte, 8)
binary.LittleEndian.PutUint64(headerSlotBuf, uint64(header.Slot))
headerSlotRoot := bytesutil.ToBytes32(headerSlotBuf)
fieldRoots[0] = headerSlotRoot[:]
proposerIdxBuf := make([]byte, 8)
binary.LittleEndian.PutUint64(proposerIdxBuf, uint64(header.ProposerIndex))
proposerIndexRoot := bytesutil.ToBytes32(proposerIdxBuf)
fieldRoots[1] = proposerIndexRoot[:]
parentRoot := bytesutil.ToBytes32(header.ParentRoot)
fieldRoots[2] = parentRoot[:]
stateRoot := bytesutil.ToBytes32(header.StateRoot)
fieldRoots[3] = stateRoot[:]
bodyRoot := bytesutil.ToBytes32(header.BodyRoot)
fieldRoots[4] = bodyRoot[:]
}
return ssz.BitwiseMerkleize(hash.CustomSHA256Hasher(), fieldRoots, uint64(len(fieldRoots)), uint64(len(fieldRoots)))
}