Trait nubls::ThresholdSignature

pub trait ThresholdSignature: Sized {
    fn assemble(fragments: &[Self]) -> Self;
    fn is_fragment(&self) -> bool;
}

A trait that describes a signature from a threshold signing protocol. Given a threshold set of signature fragments, a full signature can be assembled and verified by its corresponding threshold key.

Required methods

fn assemble(fragments: &[Self]) -> Self

The assemble function assembles a signature given a Vec containing a threshold amount of signatures. The fully-assembled signature can be verified by its corresponding threshold key.

fn is_fragment(&self) -> bool

The is_fragment method returns a bool when the PrivateKey is used for a threshold computation.

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Implementors

impl ThresholdSignature for Signature

Implements Threshold BLS signatures on Signature.

We use Shamir's Secret Sharing scheme to share n fragments of a PrivateKey where m fragments are needed to recover it. For BLS threshold signatures, this translates to needing m signatures of identical data to assemble the final Signature.

fn assemble(fragments: &[Signature]) -> Signature

Assembles a Signature from collected signature fragments.

Note: The data signed by each of the fragment signatures must be identical, or else the assembled Signature will be invalid.

This calculates the final signature by using Lagrange basis polynomials.

fn is_fragment(&self) -> bool

Returns whether or not this is a fragment of a threshold signature.

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