penKeyGen

func Recover ¶

func Recover(suite pairing.Suite, public *share.PubPoly, msg []byte, sigs [][]byte, t, n int) ([]byte, error)

Recover reconstructs the full BLS signature S = x * H(m) from a threshold t of signature shares Si using Lagrange interpolation. The full signature S can be verified through the regular BLS verification routine using the shared public key X. The shared public key can be computed by evaluating the public sharing polynomial at index 0.

func Sign ¶

func Sign(suite pairing.Suite, private *share.PriShare, msg []byte) ([]byte, error)

Sign creates a threshold BLS signature Si = xi * H(m) on the given message m using the provided secret key share xi.

func Verify ¶

func Verify(suite pairing.Suite, public *share.PubPoly, msg, sig []byte) (int, error)

Verify checks the given threshold BLS signature Si on the message m using the public key share Xi that is associated to the secret key share xi. This public key share Xi can be computed by evaluating the public sharing polynonmial at the share's index i.

func VerifyPartialSign ¶

func VerifyPartialSign(suite pairing.Suite, public *share.PubPoly, msg, sig []byte, serverId int) error