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key_manager.go
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key_manager.go
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package keys
import (
"encoding/hex"
"fmt"
"strings"
"github.com/cosmos/cosmos-sdk/crypto/hd"
ethbls "github.com/cosmos/cosmos-sdk/crypto/keys/eth/bls"
"github.com/cosmos/cosmos-sdk/crypto/keys/eth/ethsecp256k1"
ctypes "github.com/cosmos/cosmos-sdk/crypto/types"
"github.com/cosmos/cosmos-sdk/types"
"github.com/cosmos/go-bip39"
)
const (
defaultBIP39Passphrase = ""
FullPath = "m/44'/60'/0'/0/0"
)
type KeyManager interface {
ctypes.PrivKey
GetAddr() types.AccAddress
}
type keyManager struct {
privKey ctypes.PrivKey
mnemonic string
addr types.AccAddress
}
// TODO: NewKeyStoreKeyManager to be implemented
func NewPrivateKeyManager(priKey string) (KeyManager, error) {
k := keyManager{}
err := k.recoveryFromPrivateKey(priKey)
return &k, err
}
func NewMnemonicKeyManager(mnemonic string) (KeyManager, error) {
k := keyManager{}
err := k.recoveryFromMnemonic(mnemonic, FullPath)
return &k, err
}
func NewBlsPrivateKeyManager(priKey string) (KeyManager, error) {
k := keyManager{}
err := k.recoveryFromBlsPrivateKey(priKey)
return &k, err
}
func NewBlsMnemonicKeyManager(mnemonic string) (KeyManager, error) {
k := keyManager{}
err := k.recoveryBlsFromMnemonic(mnemonic, FullPath)
return &k, err
}
func (km *keyManager) recoveryFromPrivateKey(privateKey string) error {
priBytes, err := hex.DecodeString(privateKey)
if err != nil {
return err
}
if len(priBytes) != 32 {
return fmt.Errorf("Len of Keybytes is not equal to 32 ")
}
var keyBytesArray [32]byte
copy(keyBytesArray[:], priBytes[:32])
priKey := hd.EthSecp256k1.Generate()(keyBytesArray[:]).(*ethsecp256k1.PrivKey)
km.privKey = priKey
km.addr = types.AccAddress(km.privKey.PubKey().Address())
return nil
}
func (km *keyManager) recoveryFromMnemonic(mnemonic, keyPath string) error {
words := strings.Split(mnemonic, " ")
if len(words) != 12 && len(words) != 24 {
return fmt.Errorf("mnemonic length should either be 12 or 24")
}
seed, err := bip39.NewSeedWithErrorChecking(mnemonic, defaultBIP39Passphrase)
if err != nil {
return err
}
// create master key and derive first key:
masterPriv, ch := hd.ComputeMastersFromSeed(seed)
derivedPriv, err := hd.DerivePrivateKeyForPath(masterPriv, ch, keyPath)
if err != nil {
return err
}
priKey := hd.EthSecp256k1.Generate()(derivedPriv[:]).(*ethsecp256k1.PrivKey)
km.privKey = priKey
km.mnemonic = mnemonic
km.addr = types.AccAddress(km.privKey.PubKey().Address())
return nil
}
func (km *keyManager) recoveryFromBlsPrivateKey(privateKey string) error {
priBytes, err := hex.DecodeString(privateKey)
if err != nil {
return err
}
if len(priBytes) != 32 {
return fmt.Errorf("Len of Keybytes is not equal to 32 ")
}
var keyBytesArray [32]byte
copy(keyBytesArray[:], priBytes[:32])
priKey := hd.EthBLS.Generate()(keyBytesArray[:]).(*ethbls.PrivKey)
km.privKey = priKey
km.addr = types.AccAddress(km.privKey.PubKey().Address())
return nil
}
func (km *keyManager) recoveryBlsFromMnemonic(mnemonic, keyPath string) error {
words := strings.Split(mnemonic, " ")
if len(words) != 12 && len(words) != 24 {
return fmt.Errorf("mnemonic length should either be 12 or 24")
}
derivedPriv, err := hd.EthBLS.Derive()(mnemonic, defaultBIP39Passphrase, keyPath)
if err != nil {
return err
}
priKey := hd.EthBLS.Generate()(derivedPriv)
km.privKey = priKey
km.mnemonic = mnemonic
km.addr = types.AccAddress(km.privKey.PubKey().Address())
return nil
}
func (km *keyManager) Bytes() []byte {
panic("Not allow to get privKey bytes from KeyManager")
}
func (km *keyManager) Sign(msg []byte) ([]byte, error) {
return km.privKey.Sign(msg)
}
func (km *keyManager) PubKey() ctypes.PubKey {
return km.privKey.PubKey()
}
func (km *keyManager) Equals(key ctypes.LedgerPrivKey) bool {
return km.privKey.Equals(key)
}
func (km *keyManager) Type() string {
return km.privKey.Type()
}
func (km *keyManager) GetAddr() types.AccAddress {
return km.addr
}
func (km *keyManager) String() string { return km.mnemonic }
func (km *keyManager) ProtoMessage() {}
func (km *keyManager) Reset() { *km = keyManager{} }