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ssz.go
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ssz.go
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package relay
import (
"bytes"
"encoding/binary"
fastssz "github.com/prysmaticlabs/fastssz"
"github.com/prysmaticlabs/prysm/v4/encoding/ssz"
enginev1 "github.com/prysmaticlabs/prysm/v4/proto/engine/v1"
)
func generate_merkle_proof(leaves [][]byte, generalizedIndex int) ([][]byte, error) {
node, err := fastssz.TreeFromChunks(leaves)
if err != nil {
return nil, err
}
// NOTE: seems that fastssz sets root as index=1, so the index is off by one from the ethereum consensus-spes
// https://github.com/ethereum/consensus-specs/blob/c46c3945fd7fbd1226ece1f8d684c4b724b7bdab/ssz/merkle-proofs.md#generalized-merkle-tree-index
proof, err := node.Prove(generalizedIndex + 1)
if err != nil {
return nil, err
}
return proof.Hashes, nil
}
func generate_execution_payload_proof(header *enginev1.ExecutionPayloadHeaderCapella, generalizedIndex int) ([][]byte, error) {
var zero [32]byte
return generate_merkle_proof([][]byte{
header.ParentHash,
ssz_bytes(header.FeeRecipient),
header.StateRoot,
header.ReceiptsRoot,
ssz_bytes(header.LogsBloom),
header.PrevRandao,
ssz_uint64(header.BlockNumber),
ssz_uint64(header.GasLimit),
ssz_uint64(header.GasUsed),
ssz_uint64(header.Timestamp),
extraDataRootBytes(header.ExtraData),
header.BaseFeePerGas,
header.BlockHash,
header.TransactionsRoot,
header.WithdrawalsRoot,
zero[:],
}, generalizedIndex)
}
func ssz_bytes(bz []byte) []byte {
hh := fastssz.NewHasher()
hh.PutBytes(bz)
root, err := hh.HashRoot()
if err != nil {
panic(err)
}
return root[:]
}
func ssz_uint64(v uint64) []byte {
hh := fastssz.NewHasher()
hh.PutUint64(v)
root, err := hh.HashRoot()
if err != nil {
panic(err)
}
return root[:]
}
func extraDataRootBytes(tx []byte) []byte {
bz, err := extraDataRoot(tx)
if err != nil {
panic(err)
}
return bz[:]
}
func extraDataRoot(bz []byte) ([32]byte, error) {
chunkedRoots, err := ssz.PackByChunk([][]byte{bz})
if err != nil {
return [32]byte{}, err
}
const MAX_EXTRA_DATA_BYTES = 32
maxLength := (MAX_EXTRA_DATA_BYTES + 31) / 32
bytesRoot, err := ssz.BitwiseMerkleize(chunkedRoots, uint64(len(chunkedRoots)), uint64(maxLength))
if err != nil {
return [32]byte{}, err
}
bytesRootBuf := new(bytes.Buffer)
if err := binary.Write(bytesRootBuf, binary.LittleEndian, uint64(len(bz))); err != nil {
return [32]byte{}, err
}
bytesRootBufRoot := make([]byte, 32)
copy(bytesRootBufRoot, bytesRootBuf.Bytes())
return ssz.MixInLength(bytesRoot, bytesRootBufRoot), nil
}