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https://gitlab.com/pulsechaincom/prysm-pulse.git
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94 lines
3.7 KiB
Go
94 lines
3.7 KiB
Go
// Package htrutils defines HashTreeRoot utility functions.
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package htrutils
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import (
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"bytes"
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"encoding/binary"
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"github.com/pkg/errors"
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ethpb "github.com/prysmaticlabs/prysm/proto/prysm/v1alpha1"
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"github.com/prysmaticlabs/prysm/shared/bytesutil"
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"github.com/prysmaticlabs/prysm/shared/hashutil"
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"github.com/prysmaticlabs/prysm/shared/params"
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)
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// Uint64Root computes the HashTreeRoot Merkleization of
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// a simple uint64 value according to the Ethereum
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// Simple Serialize specification.
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func Uint64Root(val uint64) [32]byte {
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buf := make([]byte, 8)
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binary.LittleEndian.PutUint64(buf, val)
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root := bytesutil.ToBytes32(buf)
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return root
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}
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// ForkRoot computes the HashTreeRoot Merkleization of
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// a Fork struct value according to the Ethereum
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// Simple Serialize specification.
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func ForkRoot(fork *ethpb.Fork) ([32]byte, error) {
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fieldRoots := make([][]byte, 3)
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if fork != nil {
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prevRoot := bytesutil.ToBytes32(fork.PreviousVersion)
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fieldRoots[0] = prevRoot[:]
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currRoot := bytesutil.ToBytes32(fork.CurrentVersion)
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fieldRoots[1] = currRoot[:]
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forkEpochBuf := make([]byte, 8)
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binary.LittleEndian.PutUint64(forkEpochBuf, uint64(fork.Epoch))
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epochRoot := bytesutil.ToBytes32(forkEpochBuf)
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fieldRoots[2] = epochRoot[:]
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}
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return BitwiseMerkleize(hashutil.CustomSHA256Hasher(), fieldRoots, uint64(len(fieldRoots)), uint64(len(fieldRoots)))
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}
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// CheckpointRoot computes the HashTreeRoot Merkleization of
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// a InitWithReset struct value according to the Ethereum
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// Simple Serialize specification.
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func CheckpointRoot(hasher HashFn, checkpoint *ethpb.Checkpoint) ([32]byte, error) {
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fieldRoots := make([][]byte, 2)
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if checkpoint != nil {
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epochBuf := make([]byte, 8)
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binary.LittleEndian.PutUint64(epochBuf, uint64(checkpoint.Epoch))
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epochRoot := bytesutil.ToBytes32(epochBuf)
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fieldRoots[0] = epochRoot[:]
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ckpRoot := bytesutil.ToBytes32(checkpoint.Root)
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fieldRoots[1] = ckpRoot[:]
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}
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return BitwiseMerkleize(hasher, fieldRoots, uint64(len(fieldRoots)), uint64(len(fieldRoots)))
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}
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// HistoricalRootsRoot computes the HashTreeRoot Merkleization of
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// a list of [32]byte historical block roots according to the Ethereum
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// Simple Serialize specification.
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func HistoricalRootsRoot(historicalRoots [][]byte) ([32]byte, error) {
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result, err := BitwiseMerkleize(hashutil.CustomSHA256Hasher(), historicalRoots, uint64(len(historicalRoots)), params.BeaconConfig().HistoricalRootsLimit)
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if err != nil {
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return [32]byte{}, errors.Wrap(err, "could not compute historical roots merkleization")
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}
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historicalRootsBuf := new(bytes.Buffer)
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if err := binary.Write(historicalRootsBuf, binary.LittleEndian, uint64(len(historicalRoots))); err != nil {
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return [32]byte{}, errors.Wrap(err, "could not marshal historical roots length")
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}
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// We need to mix in the length of the slice.
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historicalRootsOutput := make([]byte, 32)
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copy(historicalRootsOutput, historicalRootsBuf.Bytes())
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mixedLen := MixInLength(result, historicalRootsOutput)
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return mixedLen, nil
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}
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// SlashingsRoot computes the HashTreeRoot Merkleization of
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// a list of uint64 slashing values according to the Ethereum
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// Simple Serialize specification.
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func SlashingsRoot(slashings []uint64) ([32]byte, error) {
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slashingMarshaling := make([][]byte, params.BeaconConfig().EpochsPerSlashingsVector)
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for i := 0; i < len(slashings) && i < len(slashingMarshaling); i++ {
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slashBuf := make([]byte, 8)
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binary.LittleEndian.PutUint64(slashBuf, slashings[i])
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slashingMarshaling[i] = slashBuf
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}
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slashingChunks, err := Pack(slashingMarshaling)
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if err != nil {
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return [32]byte{}, errors.Wrap(err, "could not pack slashings into chunks")
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}
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return BitwiseMerkleize(hashutil.CustomSHA256Hasher(), slashingChunks, uint64(len(slashingChunks)), uint64(len(slashingChunks)))
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}
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