forked from cerc-io/laconicd-deprecated
a243f43fe2
* add keyring supported algorithms * lint * minor updates * use eth_secp256k1 as the default signing algo * add flag * derivation func * refactor * rename keys amino registration * fix keys * address comments from review
85 lines
2.2 KiB
Go
85 lines
2.2 KiB
Go
package crypto
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import (
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"fmt"
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"github.com/pkg/errors"
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"crypto/hmac"
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"crypto/sha512"
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"github.com/tyler-smith/go-bip39"
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ethcrypto "github.com/ethereum/go-ethereum/crypto"
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tmcrypto "github.com/tendermint/tendermint/crypto"
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"github.com/cosmos/cosmos-sdk/crypto/keyring"
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)
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const (
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// EthSecp256k1 defines the ECDSA secp256k1 used on Ethereum
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EthSecp256k1 = keyring.SigningAlgo("eth_secp256k1")
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)
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// SupportedAlgorithms defines the list of signing algorithms used on Ethermint:
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// - eth_secp256k1 (Ethereum)
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// - secp256k1 (Tendermint)
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var SupportedAlgorithms = []keyring.SigningAlgo{EthSecp256k1, keyring.Secp256k1}
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// EthSecp256k1Options defines a keyring options for the ethereum Secp256k1 curve.
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func EthSecp256k1Options() []keyring.KeybaseOption {
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return []keyring.KeybaseOption{
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keyring.WithKeygenFunc(EthermintKeygenFunc),
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keyring.WithDeriveFunc(DeriveKey),
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keyring.WithSupportedAlgos(SupportedAlgorithms),
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keyring.WithSupportedAlgosLedger(SupportedAlgorithms),
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}
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}
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func DeriveKey(mnemonic, bip39Passphrase, hdPath string, algo keyring.SigningAlgo) ([]byte, error) {
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switch algo {
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case keyring.Secp256k1:
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return keyring.StdDeriveKey(mnemonic, bip39Passphrase, hdPath, algo)
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case EthSecp256k1:
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return DeriveSecp256k1(mnemonic, bip39Passphrase, hdPath)
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default:
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return nil, errors.Wrap(keyring.ErrUnsupportedSigningAlgo, string(algo))
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}
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}
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// EthermintKeygenFunc is the key generation function to generate secp256k1 ToECDSA
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// from ethereum.
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func EthermintKeygenFunc(bz []byte, algo keyring.SigningAlgo) (tmcrypto.PrivKey, error) {
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if algo != EthSecp256k1 {
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return nil, fmt.Errorf("signing algorithm must be %s, got %s", EthSecp256k1, algo)
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}
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return PrivKeySecp256k1(bz), nil
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}
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func DeriveSecp256k1(mnemonic, bip39Passphrase, _ string) ([]byte, error) {
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seed, err := bip39.NewSeedWithErrorChecking(mnemonic, bip39Passphrase)
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if err != nil {
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return nil, err
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}
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// HMAC the seed to produce the private key and chain code
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mac := hmac.New(sha512.New, []byte("Bitcoin seed"))
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_, err = mac.Write(seed)
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if err != nil {
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return nil, err
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}
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seed = mac.Sum(nil)
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priv, err := ethcrypto.ToECDSA(seed[:32])
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if err != nil {
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return nil, err
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}
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derivedKey := PrivKeySecp256k1(ethcrypto.FromECDSA(priv))
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return derivedKey, nil
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}
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