schnorr

Documentation

Overview

Package schnorr implements the vanilla Schnorr signature scheme. See https://en.wikipedia.org/wiki/Schnorr_signature.

The only difference regarding the vanilla reference is the computation of the response. This implementation adds the random component with the challenge times private key while the Wikipedia article substracts them.

The resulting signature is compatible with EdDSA verification algorithm when using the edwards25519 group, and by extension the CoSi verification algorithm.

Index

• func NewScheme(s Suite) sign.Scheme
• func Sign(s Suite, private kyber.Scalar, msg []byte) ([]byte, error)
• func Verify(g kyber.Group, public kyber.Point, msg, sig []byte) error
• type SchnorrScheme
  • func (s *SchnorrScheme) NewKeyPair(random cipher.Stream) (kyber.Scalar, kyber.Point)
  • func (s *SchnorrScheme) Sign(private kyber.Scalar, msg []byte) ([]byte, error)
  • func (s *SchnorrScheme) Verify(public kyber.Point, msg, sig []byte) error
• type Suite

Functions

func NewScheme

func NewScheme(s Suite) sign.Scheme

func Sign

func Sign(s Suite, private kyber.Scalar, msg []byte) ([]byte, error)

Sign creates a Sign signature from a msg and a private key. This signature can be verified with VerifySchnorr. It's also a valid EdDSA signature when using the edwards25519 Group.

func Verify

func Verify(g kyber.Group, public kyber.Point, msg, sig []byte) error

Verify verifies a given Schnorr signature. It returns nil iff the given signature is valid.

Types

type SchnorrScheme

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

func (*SchnorrScheme) NewKeyPair

func (s *SchnorrScheme) NewKeyPair(random cipher.Stream) (kyber.Scalar, kyber.Point)

func (*SchnorrScheme) Sign

func (s *SchnorrScheme) Sign(private kyber.Scalar, msg []byte) ([]byte, error)

func (*SchnorrScheme) Verify

func (s *SchnorrScheme) Verify(public kyber.Point, msg, sig []byte) error

type Suite

type Suite interface {
	kyber.Group
	kyber.Random
}

Suite represents the set of functionalities needed by the package schnorr.