kzg4844

Documentation

Overview

Package kzg4844 implements the KZG crypto for EIP-4844.

Index

• func CalcBlobHashV1(hasher hash.Hash, commit *Commitment) (vh [32]byte)
• func ComputeProof(blob Blob, point Point) (Proof, Claim, error)
• func IsValidVersionedHash(h []byte) bool
• func UseCKZG(use bool) error
• func VerifyBlobProof(blob Blob, commitment Commitment, proof Proof) error
• func VerifyProof(commitment Commitment, point Point, claim Claim, proof Proof) error
• type Blob
  • func (b Blob) MarshalText() ([]byte, error)
  • func (b *Blob) UnmarshalJSON(input []byte) error
• type Claim
• type Commitment
  • func BlobToCommitment(blob Blob) (Commitment, error)
  • func (c Commitment) MarshalText() ([]byte, error)
  • func (c *Commitment) UnmarshalJSON(input []byte) error
• type Point
• type Proof
  • func ComputeBlobProof(blob Blob, commitment Commitment) (Proof, error)
  • func (p Proof) MarshalText() ([]byte, error)
  • func (p *Proof) UnmarshalJSON(input []byte) error

Functions

func CalcBlobHashV1

func CalcBlobHashV1(hasher hash.Hash, commit *Commitment) (vh [32]byte)

CalcBlobHashV1 calculates the 'versioned blob hash' of a commitment. The given hasher must be a sha256 hash instance, otherwise the result will be invalid!

func ComputeProof

func ComputeProof(blob Blob, point Point) (Proof, Claim, error)

ComputeProof computes the KZG proof at the given point for the polynomial represented by the blob.

func IsValidVersionedHash

func IsValidVersionedHash(h []byte) bool

IsValidVersionedHash checks that h is a structurally-valid versioned blob hash.

func UseCKZG

func UseCKZG(use bool) error

UseCKZG can be called to switch the default Go implementation of KZG to the C library if fo some reason the user wishes to do so (e.g. consensus bug in one or the other).

func VerifyBlobProof

func VerifyBlobProof(blob Blob, commitment Commitment, proof Proof) error

VerifyBlobProof verifies that the blob data corresponds to the provided commitment.

func VerifyProof

func VerifyProof(commitment Commitment, point Point, claim Claim, proof Proof) error

VerifyProof verifies the KZG proof that the polynomial represented by the blob evaluated at the given point is the claimed value.

Types

type Blob

type Blob [131072]byte

Blob represents a 4844 data blob.

func (Blob) MarshalText

func (b Blob) MarshalText() ([]byte, error)

MarshalText returns the hex representation of b.

func (*Blob) UnmarshalJSON

func (b *Blob) UnmarshalJSON(input []byte) error

UnmarshalJSON parses a blob in hex syntax.

type Claim

type Claim [32]byte

Claim is a claimed evaluation value in a specific point.

type Commitment

type Commitment [48]byte

Commitment is a serialized commitment to a polynomial.

func BlobToCommitment

func BlobToCommitment(blob Blob) (Commitment, error)

BlobToCommitment creates a small commitment out of a data blob.

func (Commitment) MarshalText

func (c Commitment) MarshalText() ([]byte, error)

MarshalText returns the hex representation of c.

func (*Commitment) UnmarshalJSON

func (c *Commitment) UnmarshalJSON(input []byte) error

UnmarshalJSON parses a commitment in hex syntax.

type Point

type Point [32]byte

Point is a BLS field element.

type Proof

type Proof [48]byte

Proof is a serialized commitment to the quotient polynomial.

func ComputeBlobProof

func ComputeBlobProof(blob Blob, commitment Commitment) (Proof, error)

ComputeBlobProof returns the KZG proof that is used to verify the blob against the commitment.

This method does not verify that the commitment is correct with respect to blob.

func (Proof) MarshalText

func (p Proof) MarshalText() ([]byte, error)

MarshalText returns the hex representation of p.

func (*Proof) UnmarshalJSON

func (p *Proof) UnmarshalJSON(input []byte) error

UnmarshalJSON parses a proof in hex syntax.