72 lines
1.8 KiB
Go
72 lines
1.8 KiB
Go
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package crypto
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import (
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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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"github.com/cosmos/cosmos-sdk/crypto/hd"
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"github.com/cosmos/cosmos-sdk/crypto/keyring"
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tmcrypto "github.com/tendermint/tendermint/crypto"
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)
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// EthSecp256k1Type uses the Ethereum secp256k1 ECDSA parameters.
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const EthSecp256k1Type = hd.PubKeyType("ethsecp256k1")
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var _ keyring.SignatureAlgo = ethSecp256k1{}
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// EthSeckp256k1Option defines a keyring option for the ethereum Secp256k1 curve.
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func EthSeckp256k1Option(options *keyring.Options) {
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options.SupportedAlgos = append(options.SupportedAlgos, Secp256k1)
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options.SupportedAlgosLedger = append(options.SupportedAlgosLedger, Secp256k1)
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}
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// Secp256k1 represents the Secp256k1 curve used in Ethereum.
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var Secp256k1 = ethSecp256k1{}
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type ethSecp256k1 struct{}
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// Name returns the Secp256k1 PubKeyType.
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func (s ethSecp256k1) Name() hd.PubKeyType {
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return EthSecp256k1Type
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}
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// Derive derives and returns the secp256k1 private key for the given seed and HD path.
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func (s ethSecp256k1) Derive() hd.DeriveFn {
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return func(mnemonic string, bip39Passphrase, hdPath 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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}
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func (ethSecp256k1) Generate() hd.GenerateFn {
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return func(bz []byte) tmcrypto.PrivKey {
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var bzArr [32]byte
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copy(bzArr[:], bz)
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return PrivKeySecp256k1(bzArr[:])
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}
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}
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