crypto

Documentation

Index

• Variables
• type BitCurve
  • func (BitCurve *BitCurve) GenerateKey(rand io.Reader) (priv []byte, x, y *big.Int, err error)
  • func (BitCurve *BitCurve) ScalarBaseMult(k []byte) (*big.Int, *big.Int)
  • func (BitCurve *BitCurve) ScalarMult(Bx, By *big.Int, k []byte) (*big.Int, *big.Int)
• type EncryptECDH
  • func (e *EncryptECDH) DoEncrypt(d, k []byte) []byte
  • func (e *EncryptECDH) Id() byte

Variables

var ECDH = &EncryptECDH{}

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 (*BitCurve) GenerateKey

func (BitCurve *BitCurve) GenerateKey(rand io.Reader) (priv []byte, x, y *big.Int, err error)

TODO: double check if it is okay GenerateKey returns a public/private key pair. The private key is generated using the given reader, which must return random data.

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)

TODO: double check if it is okay ScalarMult returns k*(Bx,By) where k is a number in big-endian form.

type EncryptECDH

type EncryptECDH struct {
	InitialShareKey []byte
	PublicKey       []byte
}

func (*EncryptECDH) DoEncrypt

func (e *EncryptECDH) DoEncrypt(d, k []byte) []byte

func (*EncryptECDH) Id

func (e *EncryptECDH) Id() byte