112 lines
3.1 KiB
Go
112 lines
3.1 KiB
Go
package hd
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import (
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"github.com/btcsuite/btcd/chaincfg"
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"github.com/btcsuite/btcutil/hdkeychain"
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bip39 "github.com/tyler-smith/go-bip39"
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"github.com/ethereum/go-ethereum/accounts"
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"github.com/ethereum/go-ethereum/crypto"
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"github.com/cosmos/cosmos-sdk/crypto/hd"
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"github.com/cosmos/cosmos-sdk/crypto/keyring"
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cryptotypes "github.com/cosmos/cosmos-sdk/crypto/types"
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"github.com/tharsis/ethermint/crypto/ethsecp256k1"
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)
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const (
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// EthSecp256k1Type defines the ECDSA secp256k1 used on Ethereum
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EthSecp256k1Type = hd.PubKeyType(ethsecp256k1.KeyType)
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)
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var (
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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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SupportedAlgorithms = keyring.SigningAlgoList{EthSecp256k1, hd.Secp256k1}
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// SupportedAlgorithmsLedger defines the list of signing algorithms used on Ethermint for the Ledger device:
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// - eth_secp256k1 (Ethereum)
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// - secp256k1 (Tendermint)
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SupportedAlgorithmsLedger = keyring.SigningAlgoList{EthSecp256k1, hd.Secp256k1}
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)
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// EthSecp256k1Option defines a function keys options for the ethereum Secp256k1 curve.
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// It supports eth_secp256k1 and secp256k1 keys for accounts.
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func EthSecp256k1Option() keyring.Option {
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return func(options *keyring.Options) {
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options.SupportedAlgos = SupportedAlgorithms
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options.SupportedAlgosLedger = SupportedAlgorithmsLedger
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}
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}
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var (
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_ keyring.SignatureAlgo = EthSecp256k1
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// EthSecp256k1 uses the Bitcoin secp256k1 ECDSA parameters.
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EthSecp256k1 = ethSecp256k1Algo{}
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)
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type ethSecp256k1Algo struct{}
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// Name returns eth_secp256k1
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func (s ethSecp256k1Algo) Name() hd.PubKeyType {
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return EthSecp256k1Type
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}
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// Derive derives and returns the eth_secp256k1 private key for the given mnemonic and HD path.
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func (s ethSecp256k1Algo) Derive() hd.DeriveFn {
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return func(mnemonic, bip39Passphrase, path string) ([]byte, error) {
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hdpath, err := accounts.ParseDerivationPath(path)
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if err != nil {
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return nil, err
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}
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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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// create a BTC-utils hd-derivation key chain
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masterKey, err := hdkeychain.NewMaster(seed, &chaincfg.MainNetParams)
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if err != nil {
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return nil, err
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}
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key := masterKey
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for _, n := range hdpath {
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key, err = key.Derive(n)
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if err != nil {
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return nil, err
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}
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}
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// btc-utils representation of a secp256k1 private key
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privateKey, err := key.ECPrivKey()
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if err != nil {
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return nil, err
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}
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// cast private key to a convertible form (single scalar field element of secp256k1)
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// and then load into ethcrypto private key format.
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// TODO: add links to godocs of the two methods or implementations of them, to compare equivalency
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privateKeyECDSA := privateKey.ToECDSA()
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derivedKey := crypto.FromECDSA(privateKeyECDSA)
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return derivedKey, nil
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}
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}
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// Generate generates a eth_secp256k1 private key from the given bytes.
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func (s ethSecp256k1Algo) Generate() hd.GenerateFn {
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return func(bz []byte) cryptotypes.PrivKey {
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bzArr := make([]byte, ethsecp256k1.PrivKeySize)
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copy(bzArr, bz)
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// TODO: modulo P
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return ðsecp256k1.PrivKey{
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Key: bzArr,
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}
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}
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}
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