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158 lines
4.6 KiB
158 lines
4.6 KiB
package crypto
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import (
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"fmt"
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"github.com/pkg/errors"
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secp256k1 "github.com/btcsuite/btcd/btcec"
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ledger "github.com/zondax/ledger-goclient"
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)
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func pubkeyLedgerSecp256k1(device *ledger.Ledger, path DerivationPath) (pub PubKey, err error) {
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key, err := device.GetPublicKeySECP256K1(path)
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if err != nil {
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return pub, fmt.Errorf("Error fetching public key: %v", err)
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}
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var p PubKeySecp256k1
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// Reserialize in the 33-byte compressed format
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cmp, err := secp256k1.ParsePubKey(key[:], secp256k1.S256())
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copy(p[:], cmp.SerializeCompressed())
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return p, err
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}
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func signLedgerSecp256k1(device *ledger.Ledger, path DerivationPath, msg []byte) (sig Signature, err error) {
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bsig, err := device.SignSECP256K1(path, msg)
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if err != nil {
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return sig, err
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}
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sig = SignatureSecp256k1FromBytes(bsig)
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return sig, nil
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}
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// PrivKeyLedgerSecp256k1 implements PrivKey, calling the ledger nano
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// we cache the PubKey from the first call to use it later
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type PrivKeyLedgerSecp256k1 struct {
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// PubKey should be private, but we want to encode it via go-amino
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// so we can view the address later, even without having the ledger
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// attached
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CachedPubKey PubKey
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Path DerivationPath
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}
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// NewPrivKeyLedgerSecp256k1 will generate a new key and store the
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// public key for later use.
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func NewPrivKeyLedgerSecp256k1(path DerivationPath) (PrivKey, error) {
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var pk PrivKeyLedgerSecp256k1
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pk.Path = path
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// getPubKey will cache the pubkey for later use,
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// this allows us to return an error early if the ledger
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// is not plugged in
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_, err := pk.getPubKey()
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return &pk, err
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}
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// ValidateKey allows us to verify the sanity of a key
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// after loading it from disk
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func (pk PrivKeyLedgerSecp256k1) ValidateKey() error {
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// getPubKey will return an error if the ledger is not
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// properly set up...
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pub, err := pk.forceGetPubKey()
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if err != nil {
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return err
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}
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// verify this matches cached address
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if !pub.Equals(pk.CachedPubKey) {
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return errors.New("Cached key does not match retrieved key")
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}
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return nil
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}
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// AssertIsPrivKeyInner fulfils PrivKey Interface
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func (pk *PrivKeyLedgerSecp256k1) AssertIsPrivKeyInner() {}
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// Bytes fulfils PrivKey Interface - but it stores the cached pubkey so we can verify
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// the same key when we reconnect to a ledger
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func (pk PrivKeyLedgerSecp256k1) Bytes() []byte {
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bin, err := cdc.MarshalBinaryBare(pk)
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if err != nil {
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panic(err)
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}
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return bin
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}
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// Sign calls the ledger and stores the PubKey for future use
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//
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// XXX/TODO: panics if there is an error communicating with the ledger.
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//
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// Communication is checked on NewPrivKeyLedger and PrivKeyFromBytes,
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// returning an error, so this should only trigger if the privkey is held
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// in memory for a while before use.
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func (pk PrivKeyLedgerSecp256k1) Sign(msg []byte) Signature {
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// oh, I wish there was better error handling
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dev, err := getLedger()
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if err != nil {
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panic(err)
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}
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sig, err := signLedgerSecp256k1(dev, pk.Path, msg)
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if err != nil {
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panic(err)
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}
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pub, err := pubkeyLedgerSecp256k1(dev, pk.Path)
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if err != nil {
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panic(err)
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}
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// if we have no pubkey yet, store it for future queries
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if pk.CachedPubKey == nil {
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pk.CachedPubKey = pub
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} else if !pk.CachedPubKey.Equals(pub) {
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panic("Stored key does not match signing key")
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}
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return sig
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}
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// PubKey returns the stored PubKey
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// TODO: query the ledger if not there, once it is not volatile
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func (pk PrivKeyLedgerSecp256k1) PubKey() PubKey {
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key, err := pk.getPubKey()
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if err != nil {
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panic(err)
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}
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return key
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}
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// getPubKey reads the pubkey from cache or from the ledger itself
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// since this involves IO, it may return an error, which is not exposed
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// in the PubKey interface, so this function allows better error handling
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func (pk PrivKeyLedgerSecp256k1) getPubKey() (key PubKey, err error) {
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// if we have no pubkey, set it
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if pk.CachedPubKey == nil {
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pk.CachedPubKey, err = pk.forceGetPubKey()
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}
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return pk.CachedPubKey, err
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}
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// forceGetPubKey is like getPubKey but ignores any cached key
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// and ensures we get it from the ledger itself.
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func (pk PrivKeyLedgerSecp256k1) forceGetPubKey() (key PubKey, err error) {
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dev, err := getLedger()
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if err != nil {
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return key, errors.New(fmt.Sprintf("Cannot connect to Ledger device - error: %v", err))
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}
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key, err = pubkeyLedgerSecp256k1(dev, pk.Path)
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if err != nil {
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return key, errors.New(fmt.Sprintf("Please open Cosmos app on the Ledger device - error: %v", err))
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}
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return key, err
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}
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// Equals fulfils PrivKey Interface - makes sure both keys refer to the
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// same
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func (pk PrivKeyLedgerSecp256k1) Equals(other PrivKey) bool {
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if ledger, ok := other.(*PrivKeyLedgerSecp256k1); ok {
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return pk.CachedPubKey.Equals(ledger.CachedPubKey)
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}
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return false
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}
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