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ed25519.go
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ed25519.go
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package ed25519
import (
"bytes"
"crypto"
"crypto/rand"
"errors"
"github.com/ChainSafe/go-schnorrkel"
"github.com/vedhavyas/go-subkey/v2"
"github.com/vedhavyas/go-subkey/v2/scale"
"golang.org/x/crypto/blake2b"
"golang.org/x/crypto/ed25519"
)
type keyRing struct {
secret *ed25519.PrivateKey
pub *ed25519.PublicKey
}
func (kr keyRing) Sign(msg []byte) (signature []byte, err error) {
return kr.secret.Sign(nil, msg, crypto.Hash(0))
}
func (kr keyRing) Verify(msg []byte, signature []byte) bool {
return ed25519.Verify(*kr.pub, msg, signature)
}
func (kr keyRing) Public() []byte {
return *kr.pub
}
func (kr keyRing) Seed() []byte {
return kr.secret.Seed()
}
func (kr keyRing) AccountID() []byte {
return kr.Public()
}
func (kr keyRing) SS58Address(network uint16) string {
return subkey.SS58Encode(kr.AccountID(), network)
}
type Scheme struct{}
func (s Scheme) String() string {
return "Ed25519"
}
func (s Scheme) Generate() (subkey.KeyPair, error) {
pub, secret, err := ed25519.GenerateKey(rand.Reader)
if err != nil {
return nil, err
}
return keyRing{
secret: &secret,
pub: &pub,
}, nil
}
func (s Scheme) FromSeed(seed []byte) (subkey.KeyPair, error) {
secret := ed25519.NewKeyFromSeed(seed)
pub := secret.Public().(ed25519.PublicKey)
return keyRing{
secret: &secret,
pub: &pub,
}, nil
}
func (s Scheme) FromPhrase(phrase, pwd string) (subkey.KeyPair, error) {
seed, err := schnorrkel.SeedFromMnemonic(phrase, pwd)
if err != nil {
return nil, err
}
return s.FromSeed(seed[:32])
}
func (s Scheme) Derive(pair subkey.KeyPair, djs []subkey.DeriveJunction) (subkey.KeyPair, error) {
acc := pair.(keyRing).secret.Seed()
var err error
for _, dj := range djs {
if !dj.IsHard {
return nil, errors.New("soft derivation is not supported")
}
acc, err = deriveKeyHard(acc, dj.ChainCode)
if err != nil {
return nil, err
}
}
return s.FromSeed(acc)
}
func deriveKeyHard(secret []byte, cc [32]byte) ([]byte, error) {
var buffer bytes.Buffer
d := scale.NewEncoder(&buffer)
err := d.Encode("Ed25519HDKD")
if err != nil {
return nil, err
}
var s [32]byte
copy(s[:], secret)
for _, i := range [][32]byte{s, cc} {
err := d.Encode(i)
if err != nil {
return nil, err
}
}
seed := blake2b.Sum256(buffer.Bytes())
return seed[:], nil
}
func (s Scheme) FromPublicKey(bytes []byte) (subkey.PublicKey, error) {
key := ed25519.PublicKey(bytes)
kr := keyRing{pub: &key}
return &kr, nil
}