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key.go
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key.go
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package wallet
import (
"bytes"
"encoding/binary"
"errors"
"github.com/hectorchu/gonano/wallet/bip32"
"github.com/hectorchu/gonano/wallet/ed25519"
"github.com/tyler-smith/go-bip39"
"golang.org/x/crypto/blake2b"
)
func deriveKey(seed []byte, index uint32) (key []byte, err error) {
if len(seed) != 32 {
err = errors.New("seed must be 32 bytes")
return
}
hash, err := blake2b.New256(nil)
if err != nil {
return
}
hash.Write(seed)
if err = binary.Write(hash, binary.BigEndian, index); err != nil {
return
}
return hash.Sum(nil), nil
}
func deriveKeypair(key []byte) (pubkey, privkey []byte, err error) {
return ed25519.GenerateKey(bytes.NewReader(key))
}
func newBip39Seed(mnemonic, password string) (seed []byte, err error) {
return bip39.NewSeedWithErrorChecking(mnemonic, password)
}
func deriveBip39Key(seed []byte, index uint32) (key []byte, err error) {
key2, err := bip32.NewMasterKey(seed)
if err != nil {
return
}
for _, i := range []uint32{44, 165, index} {
if key2, err = key2.NewChildKey(0x80000000 | i); err != nil {
return
}
}
return key2.Key, nil
}