laconicd-deprecated/crypto/hd/algorithm.go
Federico Kunze 4e01da905a
crypto: refactor for stargate (#559)
* changelog

* update changelog

* crypto: refactor for stargate

* fixes

* fix keys

* changelog
2020-10-06 20:57:55 +02:00

97 lines
2.6 KiB
Go

package hd
import (
"fmt"
"github.com/pkg/errors"
"github.com/btcsuite/btcd/chaincfg"
"github.com/btcsuite/btcutil/hdkeychain"
"github.com/tyler-smith/go-bip39"
ethaccounts "github.com/ethereum/go-ethereum/accounts"
ethcrypto "github.com/ethereum/go-ethereum/crypto"
tmcrypto "github.com/tendermint/tendermint/crypto"
"github.com/cosmos/cosmos-sdk/crypto/keys"
"github.com/cosmos/ethermint/crypto/ethsecp256k1"
)
const (
// EthSecp256k1 defines the ECDSA secp256k1 used on Ethereum
EthSecp256k1 = keys.SigningAlgo(ethsecp256k1.KeyType)
)
// SupportedAlgorithms defines the list of signing algorithms used on Ethermint:
// - eth_secp256k1 (Ethereum)
// - secp256k1 (Tendermint)
var SupportedAlgorithms = []keys.SigningAlgo{EthSecp256k1, keys.Secp256k1}
// EthSecp256k1Options defines a keys options for the ethereum Secp256k1 curve.
func EthSecp256k1Options() []keys.KeybaseOption {
return []keys.KeybaseOption{
keys.WithKeygenFunc(EthermintKeygenFunc),
keys.WithDeriveFunc(DeriveKey),
keys.WithSupportedAlgos(SupportedAlgorithms),
keys.WithSupportedAlgosLedger(SupportedAlgorithms),
}
}
func DeriveKey(mnemonic, bip39Passphrase, hdPath string, algo keys.SigningAlgo) ([]byte, error) {
switch algo {
case keys.Secp256k1:
return keys.StdDeriveKey(mnemonic, bip39Passphrase, hdPath, algo)
case EthSecp256k1:
return DeriveSecp256k1(mnemonic, bip39Passphrase, hdPath)
default:
return nil, errors.Wrap(keys.ErrUnsupportedSigningAlgo, string(algo))
}
}
// EthermintKeygenFunc is the key generation function to generate secp256k1 ToECDSA
// from ethereum.
func EthermintKeygenFunc(bz []byte, algo keys.SigningAlgo) (tmcrypto.PrivKey, error) {
if algo != EthSecp256k1 {
return nil, fmt.Errorf("signing algorithm must be %s, got %s", EthSecp256k1, algo)
}
return ethsecp256k1.PrivKey(bz), nil
}
// DeriveSecp256k1 derives and returns the eth_secp256k1 private key for the given mnemonic and HD path.
func DeriveSecp256k1(mnemonic, bip39Passphrase, path string) ([]byte, error) {
hdpath, err := ethaccounts.ParseDerivationPath(path)
if err != nil {
return nil, err
}
seed, err := bip39.NewSeedWithErrorChecking(mnemonic, bip39Passphrase)
if err != nil {
return nil, err
}
masterKey, err := hdkeychain.NewMaster(seed, &chaincfg.MainNetParams)
if err != nil {
return nil, err
}
key := masterKey
for _, n := range hdpath {
key, err = key.Child(n)
if err != nil {
return nil, err
}
}
privateKey, err := key.ECPrivKey()
if err != nil {
return nil, err
}
privateKeyECDSA := privateKey.ToECDSA()
derivedKey := ethsecp256k1.PrivKey(ethcrypto.FromECDSA(privateKeyECDSA))
return derivedKey, nil
}