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 Go to latest Published: Mar 11, 2022 License: Apache-2.0 Imports: 11 Imported by: 14

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Constants

This section is empty.

Variables

This section is empty.

Functions

func K256GeneratorFromHashedBytes 

func K256GeneratorFromHashedBytes(bytes []byte) (x, y *big.Int, err error)

K256GeneratorFromHashedBytes computes a generator whose discrete log is unknown from a bytes sequence

Types

type Bls12381G1Curve 

type Bls12381G1Curve struct {
	*elliptic.CurveParams
}

func Bls12381G1 

func Bls12381G1() *Bls12381G1Curve

func Bls12381G2 

func Bls12381G2() *Bls12381G1Curve

func (*Bls12381G1Curve) Add 

func (curve *Bls12381G1Curve) Add(x1, y1, x2, y2 *big.Int) (*big.Int, *big.Int)

func (*Bls12381G1Curve) CompressedBytesFromBigInts 

func (curve *Bls12381G1Curve) CompressedBytesFromBigInts(x, y *big.Int) ([]byte, error)

CompressedBytesFromBigInts takes x and y coordinates and converts them to the BLS compressed point form

func (*Bls12381G1Curve) Double 

func (curve *Bls12381G1Curve) Double(x1, y1 *big.Int) (*big.Int, *big.Int)

func (*Bls12381G1Curve) Hash 

func (curve *Bls12381G1Curve) Hash(msg []byte) (*big.Int, *big.Int)

Hash an arbitrary byte sequence to a G1 point according to the hash-to-curve standard

func (*Bls12381G1Curve) IsOnCurve 

func (curve *Bls12381G1Curve) IsOnCurve(x, y *big.Int) bool

func (*Bls12381G1Curve) Params 

func (curve *Bls12381G1Curve) Params() *elliptic.CurveParams

func (*Bls12381G1Curve) ScalarBaseMult 

func (curve *Bls12381G1Curve) ScalarBaseMult(k []byte) (*big.Int, *big.Int)

func (*Bls12381G1Curve) ScalarMult 

func (curve *Bls12381G1Curve) ScalarMult(Bx, By *big.Int, k []byte) (*big.Int, *big.Int)

type Bls12381G2Curve 

type Bls12381G2Curve struct {
	*elliptic.CurveParams
}

func (*Bls12381G2Curve) Add 

func (curve *Bls12381G2Curve) Add(x1, y1, x2, y2 *big.Int) (*big.Int, *big.Int)

func (*Bls12381G2Curve) CompressedBytesFromBigInts 

func (curve *Bls12381G2Curve) CompressedBytesFromBigInts(x, y *big.Int) ([]byte, error)

CompressedBytesFromBigInts takes x and y coordinates and converts them to the BLS compressed point form

func (*Bls12381G2Curve) Double 

func (curve *Bls12381G2Curve) Double(x1, y1 *big.Int) (*big.Int, *big.Int)

func (*Bls12381G2Curve) Hash 

func (curve *Bls12381G2Curve) Hash(msg []byte) (*big.Int, *big.Int)

Hash an arbitrary byte sequence to a G1 point according to the hash-to-curve standard

func (*Bls12381G2Curve) IsOnCurve 

func (curve *Bls12381G2Curve) IsOnCurve(x, y *big.Int) bool

func (*Bls12381G2Curve) Params 

func (curve *Bls12381G2Curve) Params() *elliptic.CurveParams

func (*Bls12381G2Curve) ScalarBaseMult 

func (curve *Bls12381G2Curve) ScalarBaseMult(k []byte) (*big.Int, *big.Int)

func (*Bls12381G2Curve) ScalarMult 

func (curve *Bls12381G2Curve) ScalarMult(Bx, By *big.Int, k []byte) (*big.Int, *big.Int)

type Ed25519Curve 

type Ed25519Curve struct {
	*elliptic.CurveParams
}

func Ed25519 

func Ed25519() *Ed25519Curve

func (*Ed25519Curve) Add 

func (curve *Ed25519Curve) Add(x1, y1, x2, y2 *big.Int) (*big.Int, *big.Int)

func (*Ed25519Curve) Double 

func (curve *Ed25519Curve) Double(x1, y1 *big.Int) (*big.Int, *big.Int)

func (*Ed25519Curve) Hash 

func (curve *Ed25519Curve) Hash(msg []byte) (*big.Int, *big.Int)

func (*Ed25519Curve) IsOnCurve 

func (curve *Ed25519Curve) IsOnCurve(x, y *big.Int) bool

func (*Ed25519Curve) Neg 

func (curve *Ed25519Curve) Neg(Bx, By *big.Int) (*big.Int, *big.Int)

func (*Ed25519Curve) Params 

func (curve *Ed25519Curve) Params() *elliptic.CurveParams

func (*Ed25519Curve) ScalarBaseMult 

func (curve *Ed25519Curve) ScalarBaseMult(k []byte) (*big.Int, *big.Int)

func (*Ed25519Curve) ScalarMult 

func (curve *Ed25519Curve) ScalarMult(Bx, By *big.Int, k []byte) (*big.Int, *big.Int)

type Feldman 

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

Feldman Verifiable Secret Sharing Scheme

func NewFeldman 

func NewFeldman(threshold, limit uint32, curve elliptic.Curve) (*Feldman, error)

func (Feldman) Combine 

func (f Feldman) Combine(shares ...*ShamirShare) ([]byte, error)

func (Feldman) Split 

func (f Feldman) Split(secret []byte) ([]*ShareVerifier, []*ShamirShare, error)

func (Feldman) Verify 

func (f Feldman) Verify(share *ShamirShare, verifiers []*ShareVerifier) (bool, error)

Verify checks a share for validity

type FeldmanResult 

type FeldmanResult struct {
	SecretShares []*ShamirShare
	Verifiers    []*ShareVerifier
}

FeldmanResult contains all the data from calling Split

type Pedersen 

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

Pedersen Verifiable Secret Sharing Scheme

func NewPedersen 

func NewPedersen(threshold, limit uint32, generator *curves.EcPoint) (*Pedersen, error)

NewPedersen creates a new pedersen VSS

func (Pedersen) Combine 

func (pd Pedersen) Combine(shares ...*ShamirShare) ([]byte, error)

Combine recreates the original secret from the shares

func (Pedersen) Split 

func (pd Pedersen) Split(secret []byte) (*PedersenResult, error)

Split creates the verifiers, blinding and shares

func (Pedersen) Verify 

func (pd Pedersen) Verify(share *ShamirShare, blinding *ShamirShare, blindedverifiers []*ShareVerifier) (bool, error)

Verify checks a share for validity

type PedersenResult 

type PedersenResult struct {
	Blinding                     *big.Int
	BlindingShares, SecretShares []*ShamirShare
	BlindedVerifiers             []*ShareVerifier
	Verifiers                    []*ShareVerifier
}

PedersenResult contains all the data from calling Split

type Shamir 

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

Shamir is the Shamir secret sharing scheme

func NewShamir 

func NewShamir(threshold, limit int, field *curves.Field) (*Shamir, error)

NewShamir creates a Shamir secret sharing scheme

func (*Shamir) Combine 

func (s *Shamir) Combine(shares ...*ShamirShare) ([]byte, error)

Combine takes any number of shares and tries to combine them into the original secret

func (Shamir) ComputeL 

func (s Shamir) ComputeL(shares ...*ShamirShare) ([]*curves.Element, error)

ComputeL is a function that computes all Lagrange coefficients. This function is particularly needed in FROST tSchnorr signature.

func (*Shamir) GetSharesAndPolynomial 

func (s *Shamir) GetSharesAndPolynomial(secret []byte) ([]*ShamirShare, *polynomial, error)

getSharesAndPolynomial returns the shares for the specified secret and the polynomial used to create the shares

func (*Shamir) Interpolate 

func (s *Shamir) Interpolate(xCoordinates, yCoordinates []*curves.Element) (*curves.Element, error)

interpolate calculates the lagrange interpolation

func (*Shamir) Split 

func (s *Shamir) Split(secret []byte) ([]*ShamirShare, error)

Split takes a secret and splits it into multiple shares that requires threshold to reconstruct

type ShamirShare 

type ShamirShare struct {
	// x-coordinate
	Identifier uint32 `json:"identifier"`
	// y-coordinate
	Value *curves.Element `json:"value"`
}

ShamirShare is the data from splitting a secret

func NewShamirShare 

func NewShamirShare(x uint32, y []byte, f *curves.Field) *ShamirShare

NewShamirShare creates a ShamirShare given the Identifier, value, and Field for the value

func (ShamirShare) Add 

func (s ShamirShare) Add(other *ShamirShare) *ShamirShare

Add returns the sum of two Shamir shares

func (ShamirShare) Bytes 

func (s ShamirShare) Bytes() []byte

Bytes returns the representation of the share in bytes with the identifier as the first 4 bytes

type ShareVerifier 

type ShareVerifier = kryptology.EcPoint

ShareVerifier is used to verify secret shares from Feldman or Pedersen VSS

Source Files

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