dss

Documentation

Overview

Run a NonceDKG and sign the supplied hash.

This is a simplified implementation. Later the DKG part can be run in advance, while waiting for transactions.

The general workflow is the following:

1. Start it upon activation of a step (last stateOutput is approved).
2. Exchange the underlying messages until: 2.1. ACSS Intermediate output is received.
3. Then wait for the ACS and then the VM to complete: 3.1. pass the ACS result to the nonce-dkg (to complete the nonces). 3.2. pass the VM output as a message to sign (its hash).
4. Exchange messages until the signature is produced.
5. Output the signature.

TODO: Make sure no two signatures are ever produced by the nonce-dkg for the same

base TX. That would reveal the permanent private key of the committee.

Index

• func NewMsgDecided(me gpa.NodeID, decidedIndexProposals map[gpa.NodeID][]int, ...) gpa.Message
• type DSS
  • func New(suite suites.Suite, nodeIDs []gpa.NodeID, nodePKs map[gpa.NodeID]kyber.Point, ...) DSS
• type Output
• type SecretShare
  • func NewSecretShare(priShare *share.PriShare, commits []kyber.Point) *SecretShare
  • func (s *SecretShare) Commitments() []kyber.Point
  • func (s *SecretShare) PriShare() *share.PriShare

Functions

func NewMsgDecided

func NewMsgDecided(me gpa.NodeID, decidedIndexProposals map[gpa.NodeID][]int, messageToSign []byte) gpa.Message

Types

type DSS

type DSS interface {
	AsGPA() gpa.GPA
	NewMsgDecided(decidedIndexProposals map[gpa.NodeID][]int, messageToSign []byte) gpa.Message
}

func New

func New(
	suite suites.Suite,
	nodeIDs []gpa.NodeID,
	nodePKs map[gpa.NodeID]kyber.Point,
	f int,
	me gpa.NodeID,
	mySK kyber.Scalar,
	longTermSecretShare dss.DistKeyShare,
	log *logger.Logger,
) DSS

type Output

type Output struct {
	ProposedIndexes []int  // Intermediate output.
	Signature       []byte // Final output.
}

type SecretShare

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

func NewSecretShare

func NewSecretShare(priShare *share.PriShare, commits []kyber.Point) *SecretShare

func (*SecretShare) Commitments

func (s *SecretShare) Commitments() []kyber.Point

Commitments returns the coefficients of the public polynomial.

func (*SecretShare) PriShare

func (s *SecretShare) PriShare() *share.PriShare

PriShare returns the private share.