bls

func AggregateSignatures ¶

func AggregateSignatures(s pbc.PairingSuite, public *share.PubPoly, msg []byte, sigs []*ThresholdSig, n, t int) ([]byte, error)

AggregateSignatures takes a list of threshold signatures, verifies them against the message and the given public polynomial. If there are enough valid threshold signatures, the final BLS signature is generated.

func NewKeyPair ¶

func NewKeyPair(s pbc.PairingSuite, r cipher.Stream) (kyber.Scalar, kyber.Point)

func Sign ¶

func Sign(s pbc.PairingSuite, private kyber.Scalar, msg []byte) []byte

Performs a BLS signature operation. Namely, it computes:

x * H(m) as a point on G1

where x is the private key, and m the message.

func ThresholdVerify ¶

func ThresholdVerify(s pbc.PairingSuite, public *share.PubPoly, msg []byte, sig *ThresholdSig) bool

ThresholdVerify verifies that the threshold signature is have been correctly generated from the private share generated during a DKG.

func Verify ¶

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

Verify checks the signature. Namely, it checks the equivalence between

e(H(m),X) == e(H(m), G2^x) == e(H(m)^x, G2) == e(s, G2)

where m is the message, X the public key from G2, s the signature and G2 the base point from which the public key have been generated.