ssz

Documentation

Overview

Package ssz defines HashTreeRoot utility functions.

Index

• func BitlistRoot(bfield bitfield.Bitfield, maxCapacity uint64) ([32]byte, error)
• func BitwiseMerkleize(chunks [][32]byte, count, limit uint64) ([32]byte, error)
• func ByteArrayRootWithLimit(roots [][]byte, limit uint64) ([32]byte, error)
• func CheckpointRoot(checkpoint *ethpb.Checkpoint) ([32]byte, error)
• func ConstructProof(hasher Hasher, count, limit uint64, leaf func(i uint64) []byte, index uint64) (branch [][32]byte)
• func Depth(v uint64) (out uint8)
• func ForkRoot(fork *ethpb.Fork) ([32]byte, error)
• func Merkleize(hasher Hasher, count, limit uint64, leaf func(i uint64) []byte) (out [32]byte)
• func MerkleizeVector(elements [][32]byte, length uint64) [32]byte
• func MixInLength(root [32]byte, length []byte) [32]byte
• func PackByChunk(serializedItems [][]byte) ([][bytesPerChunk]byte, error)
• func SlashingsRoot(slashings []uint64) ([32]byte, error)
• func TransactionsRoot(txs [][]byte) ([32]byte, error)
• func Uint64Root(val uint64) [32]byte
• func WithdrawalSliceRoot(withdrawals []*enginev1.Withdrawal, limit uint64) ([32]byte, error)
• type HashFn
• type Hasher
• type HasherFunc
  • func NewHasherFunc(h HashFn) *HasherFunc
  • func (h *HasherFunc) Combi(a, b [32]byte) [32]byte
  • func (h *HasherFunc) Hash(a []byte) [32]byte
  • func (h *HasherFunc) MixIn(a [32]byte, i uint64) [32]byte

Functions

func BitlistRoot

func BitlistRoot(bfield bitfield.Bitfield, maxCapacity uint64) ([32]byte, error)

BitlistRoot returns the mix in length of a bitwise Merkleized bitfield.

func BitwiseMerkleize

func BitwiseMerkleize(chunks [][32]byte, count, limit uint64) ([32]byte, error)

BitwiseMerkleize - given ordered BYTES_PER_CHUNK-byte chunks, if necessary utilize zero chunks so that the number of chunks is a power of two, Merkleize the chunks, and return the root. Note that merkleize on a single chunk is simply that chunk, i.e. the identity when the number of chunks is one.

func ByteArrayRootWithLimit

func ByteArrayRootWithLimit(roots [][]byte, limit uint64) ([32]byte, error)

ByteArrayRootWithLimit computes the HashTreeRoot Merkleization of a list of [32]byte roots according to the Ethereum Simple Serialize specification.

func CheckpointRoot

func CheckpointRoot(checkpoint *ethpb.Checkpoint) ([32]byte, error)

CheckpointRoot computes the HashTreeRoot Merkleization of a InitWithReset struct value according to the Ethereum Simple Serialize specification.

func ConstructProof

func ConstructProof(hasher Hasher, count, limit uint64, leaf func(i uint64) []byte, index uint64) (branch [][32]byte)

ConstructProof builds a merkle-branch of the given depth, at the given index (at that depth), for a list of leafs of a balanced binary tree.

func Depth

func Depth(v uint64) (out uint8)

Depth retrieves the appropriate depth for the provided trie size.

func ForkRoot

func ForkRoot(fork *ethpb.Fork) ([32]byte, error)

ForkRoot computes the HashTreeRoot Merkleization of a Fork struct value according to the Ethereum Simple Serialize specification.

func Merkleize

func Merkleize(hasher Hasher, count, limit uint64, leaf func(i uint64) []byte) (out [32]byte)

Merkleize with log(N) space allocation

func MerkleizeVector

func MerkleizeVector(elements [][32]byte, length uint64) [32]byte

MerkleizeVector uses our optimized routine to hash a list of 32-byte elements.

func MixInLength

func MixInLength(root [32]byte, length []byte) [32]byte

MixInLength appends hash length to root

func PackByChunk

func PackByChunk(serializedItems [][]byte) ([][bytesPerChunk]byte, error)

PackByChunk a given byte array's final chunk with zeroes if needed.

func SlashingsRoot

func SlashingsRoot(slashings []uint64) ([32]byte, error)

SlashingsRoot computes the HashTreeRoot Merkleization of a list of uint64 slashing values according to the Ethereum Simple Serialize specification.

func TransactionsRoot

func TransactionsRoot(txs [][]byte) ([32]byte, error)

TransactionsRoot computes the HTR for the Transactions' property of the ExecutionPayload The code was largely copy/pasted from the code generated to compute the HTR of the entire ExecutionPayload.

func Uint64Root

func Uint64Root(val uint64) [32]byte

Uint64Root computes the HashTreeRoot Merkleization of a simple uint64 value according to the Ethereum Simple Serialize specification.

func WithdrawalSliceRoot

func WithdrawalSliceRoot(withdrawals []*enginev1.Withdrawal, limit uint64) ([32]byte, error)

WithdrawalSliceRoot computes the HTR of a slice of withdrawals. The limit parameter is used as input to the bitwise merkleization algorithm.

Types

type HashFn

type HashFn func(input []byte) [32]byte

HashFn is the generic hash function signature.

type Hasher

type Hasher interface {
	Hash(a []byte) [32]byte
	Combi(a [32]byte, b [32]byte) [32]byte
	MixIn(a [32]byte, i uint64) [32]byte
}

Hasher describes an interface through which we can perform hash operations on byte arrays,indices,etc.

type HasherFunc

type HasherFunc struct {
	// contains filtered or unexported fields
}

HasherFunc defines a structure to hold a hash function and can be used for multiple rounds of hashing.

func NewHasherFunc

func NewHasherFunc(h HashFn) *HasherFunc

NewHasherFunc is the constructor for the object that fulfills the Hasher interface.

func (*HasherFunc) Combi

func (h *HasherFunc) Combi(a, b [32]byte) [32]byte

Combi appends the two inputs and hashes them.

func (*HasherFunc) Hash

func (h *HasherFunc) Hash(a []byte) [32]byte

Hash utilizes the provided hash function for the object.

func (*HasherFunc) MixIn

func (h *HasherFunc) MixIn(a [32]byte, i uint64) [32]byte

MixIn works like Combi, but using an integer as the second input.