ed25519.go

package crypto

import (
	"bytes"
	"crypto/rand"

	"github.com/yancaitech/go-utils"
	"golang.org/x/crypto/ed25519"
)

type ed25519key struct {
	priv [ed25519.PrivateKeySize]byte
}

func checkSequenceIsNil(seq *uint32) {
	if seq != nil {
		panic("Ed25519 keys do not support account families")
	}
}

func (e *ed25519key) Id(seq *uint32) []byte {
	checkSequenceIsNil(seq)
	return Sha256RipeMD160(e.Public(seq))
}

func (e *ed25519key) Public(seq *uint32) []byte {
	checkSequenceIsNil(seq)
	return append([]byte{0xED}, e.priv[32:]...)
}

func (e *ed25519key) Private(seq *uint32) []byte {
	checkSequenceIsNil(seq)
	return e.priv[:]
}

func NewEd25519Key(seed []byte) (*ed25519key, error) {
	r := rand.Reader
	if seed != nil {
		r = bytes.NewReader(Sha512Half(seed))
	}
	_, priv, err := ed25519.GenerateKey(r)
	if err != nil {
		return nil, err
	}
	var k ed25519key
	utils.ByteSliceCopy(priv, 0, k.priv[:], 0, 64)
	return &k, nil
	//return &ed25519key{[]byte(priv)}, nil
}