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v0.0.1 Latest Latest Go to latest Published: Oct 26, 2022 License: Apache-2.0 Imports: 5 Imported by: 0

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github.com/capsule-org/multi-party-sig

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Documentation ¶

Index ¶

type PreSignature
- func EmptyPreSignature(group curve.Curve) *PreSignature
type Signature
- func EmptySignature(group curve.Curve) Signature
- func (sig Signature) Verify(X curve.Point, hash []byte) bool
type SignatureShare

Constants ¶

This section is empty.

Variables ¶

This section is empty.

Functions ¶

This section is empty.

Types ¶

type PreSignature ¶

type PreSignature struct {
	// ID is a random identifier for this specific presignature.
	ID types.RID
	// R = δ⁻¹⋅Γ = δ⁻¹⋅(∑ⱼ Γⱼ) = (∑ⱼδ⁻¹γⱼ)⋅G = k⁻¹⋅G
	R curve.Point
	// RBar[j] = δ⁻¹⋅Δⱼ = (δ⁻¹kⱼ)⋅Γ = (k⁻¹kⱼ)⋅G
	RBar *party.PointMap
	// S[j] = χⱼ⋅R
	S *party.PointMap
	// KShare = kᵢ
	KShare curve.Scalar
	// ChiShare = χᵢ
	ChiShare curve.Scalar
}

func EmptyPreSignature ¶

func EmptyPreSignature(group curve.Curve) *PreSignature

EmptyPreSignature returns a PreSignature with a given group, ready for unmarshalling.

func (*PreSignature) Group ¶

func (sig *PreSignature) Group() curve.Curve

Group returns the elliptic curve group associated with this PreSignature.

func (*PreSignature) Signature ¶

func (sig *PreSignature) Signature(shares map[party.ID]SignatureShare) *Signature

Signature combines the given shares σⱼ and returns a pair (R,S), where S=∑ⱼσⱼ.

func (*PreSignature) SignatureShare ¶

func (sig *PreSignature) SignatureShare(hash []byte) curve.Scalar

SignatureShare returns this party's share σᵢ = kᵢm+rχᵢ, where s = ∑ⱼσⱼ.

func (*PreSignature) SignerIDs ¶

func (sig *PreSignature) SignerIDs() party.IDSlice

func (*PreSignature) Validate ¶

func (sig *PreSignature) Validate() error

func (*PreSignature) VerifySignatureShares ¶

func (sig *PreSignature) VerifySignatureShares(shares map[party.ID]SignatureShare, hash []byte) (culprits []party.ID)

VerifySignatureShares should be called if the signature returned by PreSignature.Signature is not valid. It returns the list of parties whose shares are invalid.

type Signature ¶

type Signature struct {
	R curve.Point
	S curve.Scalar
}

func EmptySignature ¶

func EmptySignature(group curve.Curve) Signature

EmptySignature returns a new signature with a given curve, ready to be unmarshalled.

func (Signature) Verify ¶

func (sig Signature) Verify(X curve.Point, hash []byte) bool

Verify is a custom signature format using curve data.

type SignatureShare ¶

type SignatureShare = curve.Scalar

SignatureShare represents an individual additive share of the signature's "s" component.

Source Files ¶

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