secp256k1

Documentation

Index

• type BitCurve
  • func S256() *BitCurve
  • func (bitCurve *BitCurve) Add(x1, y1, x2, y2 *big.Int) (*big.Int, *big.Int)
  • func (bitCurve *BitCurve) Double(x1, y1 *big.Int) (*big.Int, *big.Int)
  • func (bitCurve *BitCurve) IsOnCurve(x, y *big.Int) bool
  • func (bitCurve *BitCurve) Marshal(x, y *big.Int) []byte
  • func (bitCurve *BitCurve) Params() *elliptic.CurveParams
  • func (bitCurve *BitCurve) ScalarBaseMult(k []byte) (*big.Int, *big.Int)
  • func (bitCurve *BitCurve) ScalarMult(Bx, By *big.Int, k []byte) (*big.Int, *big.Int)
  • func (bitCurve *BitCurve) Unmarshal(data []byte) (x, y *big.Int)

Types

type BitCurve

type BitCurve struct {
	P       *big.Int // the order of the underlying field
	N       *big.Int // the order of the base point
	B       *big.Int // the constant of the BitCurve equation
	Gx, Gy  *big.Int // (x,y) of the base point
	BitSize int      // the size of the underlying field
}

A BitCurve represents a Koblitz Curve with a=0. See http://www.hyperelliptic.org/EFD/g1p/auto-shortw.html

func S256

func S256() *BitCurve

S256 returns a BitCurve which implements secp256k1.

func (*BitCurve) Add

func (bitCurve *BitCurve) Add(x1, y1, x2, y2 *big.Int) (*big.Int, *big.Int)

Add returns the sum of (x1,y1) and (x2,y2)

func (*BitCurve) Double

func (bitCurve *BitCurve) Double(x1, y1 *big.Int) (*big.Int, *big.Int)

Double returns 2*(x,y)

func (*BitCurve) IsOnCurve

func (bitCurve *BitCurve) IsOnCurve(x, y *big.Int) bool

IsOnCurve returns true if the given (x,y) lies on the BitCurve.

func (*BitCurve) Marshal

func (bitCurve *BitCurve) Marshal(x, y *big.Int) []byte

Marshal converts a point into the form specified in section 4.3.6 of ANSI X9.62.

func (*BitCurve) Params

func (bitCurve *BitCurve) Params() *elliptic.CurveParams

func (*BitCurve) ScalarBaseMult

func (bitCurve *BitCurve) ScalarBaseMult(k []byte) (*big.Int, *big.Int)

ScalarBaseMult returns k*G, where G is the base point of the group and k is an integer in big-endian form.

func (*BitCurve) ScalarMult

func (bitCurve *BitCurve) ScalarMult(Bx, By *big.Int, k []byte) (*big.Int, *big.Int)

ScalarMult returns k*(Bx,By) where k is a number in big-endian form.

func (*BitCurve) Unmarshal

func (bitCurve *BitCurve) Unmarshal(data []byte) (x, y *big.Int)

Unmarshal converts a point, serialised by Marshal, into an x, y pair. On error, x = nil.