Class SignatureShare<C>

A participant's signature share, which the coordinator will aggregate with all other signer's shares into the joint signature.

Type Parameters

C extends Ciphersuite

Index

Methods

fromScalar toScalar deserialize serialize verify toString equals clone

Methods

`Static`fromScalar

fromScalar<C extends Ciphersuite>(
ciphersuite: C,
scalar: C["Scalar"],
): SignatureShare<C>
Internal
Create a new SignatureShare from a scalar.
Type Parameters
- C extends Ciphersuite
Parameters
- ciphersuite: C
- scalar: C["Scalar"]
Returns SignatureShare<C>
- Defined in round2.ts:46

toScalar

toScalar(): C["Scalar"]
Internal
Convert to the underlying scalar value.

Returns C["Scalar"]
- Defined in round2.ts:54

`Static`deserialize

deserialize<C extends Ciphersuite>(
ciphersuite: C,
bytes: Uint8Array,
): SignatureShare<C>
Deserialize a SignatureShare from bytes.
Type Parameters
- C extends Ciphersuite
Parameters
- ciphersuite: C
  The ciphersuite to use
- bytes: Uint8Array
  The serialized share bytes
Returns SignatureShare<C>
The deserialized signature share

Throws
Error if deserialization fails
- Defined in round2.ts:66

serialize

serialize(): Uint8Array
Serialize the SignatureShare to bytes.

Returns Uint8Array
The serialized share bytes
- Defined in round2.ts:76

verify

verify(
    identifier: Identifier<C>,
    groupCommitmentShare: GroupCommitmentShare<C>,
    verifyingShare: VerifyingShare<C>,
    lambdaI: C["Scalar"],
    challenge: Challenge<C>,
): void
Internal
Tests if a signature share issued by a participant is valid before aggregating it into a final joint signature to publish.

This is the final step of verify_signature_share from the spec.
Parameters
- identifier: Identifier<C>
  The participant's identifier
- groupCommitmentShare: GroupCommitmentShare<C>
  The participant's group commitment share
- verifyingShare: VerifyingShare<C>
  The participant's verifying share (public key share)
- lambdaI: C["Scalar"]
  The Lagrange coefficient for this participant
- challenge: Challenge<C>
  The signature challenge
Returns void
See
https://datatracker.ietf.org/doc/html/rfc9591#name-signature-share-aggregation

Throws
Error if the signature share is invalid
- Defined in round2.ts:96

toString

toString(): string
Returns a string representation of this SignatureShare.

Returns string
- Defined in round2.ts:127

equals

equals(other: SignatureShare<C>): boolean
Check equality with another SignatureShare.
Parameters
- other: SignatureShare<C>
  The other SignatureShare to compare
Returns boolean
true if the shares are equal
- Defined in round2.ts:137

clone

clone(): SignatureShare<C>
Clone this SignatureShare.

Returns SignatureShare<C>
A new SignatureShare with the same value
- Defined in round2.ts:146