laconicd/crypto/algorithm.go

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package crypto
import (
"fmt"
"github.com/pkg/errors"
"crypto/hmac"
"crypto/sha512"
"github.com/tyler-smith/go-bip39"
ethcrypto "github.com/ethereum/go-ethereum/crypto"
tmcrypto "github.com/tendermint/tendermint/crypto"
"github.com/cosmos/cosmos-sdk/crypto/keys"
)
const (
// EthSecp256k1 defines the ECDSA secp256k1 used on Ethereum
EthSecp256k1 = keys.SigningAlgo("eth_secp256k1")
)
// 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 PrivKeySecp256k1(bz), nil
}
func DeriveSecp256k1(mnemonic, bip39Passphrase, _ string) ([]byte, error) {
seed, err := bip39.NewSeedWithErrorChecking(mnemonic, bip39Passphrase)
if err != nil {
return nil, err
}
// HMAC the seed to produce the private key and chain code
mac := hmac.New(sha512.New, []byte("Bitcoin seed"))
_, err = mac.Write(seed)
if err != nil {
return nil, err
}
seed = mac.Sum(nil)
priv, err := ethcrypto.ToECDSA(seed[:32])
if err != nil {
return nil, err
}
derivedKey := PrivKeySecp256k1(ethcrypto.FromECDSA(priv))
return derivedKey, nil
}