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252 lines
6.4 KiB
252 lines
6.4 KiB
package nano
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import (
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"bytes"
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"encoding/hex"
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"github.com/pkg/errors"
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ledger "github.com/ethanfrey/ledger"
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crypto "github.com/tendermint/go-crypto"
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wire "github.com/tendermint/go-wire"
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)
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const (
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NameLedger = "ledger"
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TypeLedger = 0x10
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)
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var device *ledger.Ledger
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// getLedger gets a copy of the device, and caches it
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func getLedger() (*ledger.Ledger, error) {
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var err error
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if device == nil {
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device, err = ledger.FindLedger()
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}
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return device, err
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}
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func signLedger(device *ledger.Ledger, msg []byte) (pk crypto.PubKey, sig crypto.Signature, err error) {
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var resp []byte
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packets := generateSignRequests(msg)
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for _, pack := range packets {
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resp, err = device.Exchange(pack, 100)
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if err != nil {
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return pk, sig, err
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}
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}
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// the last call is the result we want and needs to be parsed
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key, bsig, err := parseDigest(resp)
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if err != nil {
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return pk, sig, err
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}
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var b [32]byte
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copy(b[:], key)
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return PubKeyLedgerFromBytes(b), crypto.SignatureEd25519FromBytes(bsig), nil
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}
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// PrivKeyLedger 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 PrivKeyLedger struct {
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// PubKey should be private, but we want to encode it via go-wire
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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 crypto.PubKey
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}
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func NewPrivKeyLedger() (crypto.PrivKey, error) {
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var pk PrivKeyLedger
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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.Wrap(), err
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}
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// AssertIsPrivKeyInner fulfils PrivKey Interface
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func (pk *PrivKeyLedger) AssertIsPrivKeyInner() {}
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// Bytes fulfils pk Interface - no data, just type info
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func (pk *PrivKeyLedger) Bytes() []byte {
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return wire.BinaryBytes(pk.Wrap())
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}
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// Sign calls the ledger and stores the pk for future use
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func (pk *PrivKeyLedger) Sign(msg []byte) crypto.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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pub, sig, err := signLedger(dev, msg)
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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.Empty() {
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pk.CachedPubKey = pub
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} else if !pk.CachedPubKey.Equals(pub) {
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panic("signed with a different key than stored")
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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 *PrivKeyLedger) PubKey() crypto.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 *PrivKeyLedger) getPubKey() (key crypto.PubKey, err error) {
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// if we have no pubkey, set it
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if pk.CachedPubKey.Empty() {
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dev, err := getLedger()
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if err != nil {
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return key, errors.WithMessage(err, "Can't connect to ledger")
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}
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pk.CachedPubKey, _, err = signLedger(dev, []byte{0})
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if err != nil {
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return key, errors.WithMessage(err, "Can't sign with app")
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}
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}
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return pk.CachedPubKey, nil
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}
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// Equals fulfils PrivKey Interface
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// TODO: needs to be fixed
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func (pk *PrivKeyLedger) Equals(other crypto.PrivKey) bool {
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if _, ok := other.Unwrap().(*PrivKeyLedger); ok {
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return true
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}
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return false
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}
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// MockPrivKeyLedger behaves as the ledger, but stores a pre-packaged call-response
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// for use in test cases
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type MockPrivKeyLedger struct {
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Msg []byte
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Pub [KeyLength]byte
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Sig [SigLength]byte
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}
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// NewMockKey returns
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func NewMockKey(msg, pubkey, sig string) (pk MockPrivKeyLedger) {
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var err error
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pk.Msg, err = hex.DecodeString(msg)
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if err != nil {
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panic(err)
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}
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bpk, err := hex.DecodeString(pubkey)
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if err != nil {
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panic(err)
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}
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bsig, err := hex.DecodeString(sig)
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if err != nil {
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panic(err)
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}
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copy(pk.Pub[:], bpk)
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copy(pk.Sig[:], bsig)
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return pk
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}
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var _ crypto.PrivKeyInner = MockPrivKeyLedger{}
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// AssertIsPrivKeyInner fulfils PrivKey Interface
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func (pk MockPrivKeyLedger) AssertIsPrivKeyInner() {}
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// Bytes fulfils PrivKey Interface - not supported
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func (pk MockPrivKeyLedger) Bytes() []byte {
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return nil
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}
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// Sign returns a real SignatureLedger, if the msg matches what we expect
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func (pk MockPrivKeyLedger) Sign(msg []byte) crypto.Signature {
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if !bytes.Equal(pk.Msg, msg) {
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panic("Mock key is for different msg")
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}
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return crypto.SignatureEd25519(pk.Sig).Wrap()
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}
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// PubKey returns a real PubKeyLedger, that will verify this signature
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func (pk MockPrivKeyLedger) PubKey() crypto.PubKey {
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return PubKeyLedgerFromBytes(pk.Pub)
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}
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// Equals compares that two Mocks have the same data
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func (pk MockPrivKeyLedger) Equals(other crypto.PrivKey) bool {
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if mock, ok := other.Unwrap().(MockPrivKeyLedger); ok {
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return bytes.Equal(mock.Pub[:], pk.Pub[:]) &&
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bytes.Equal(mock.Sig[:], pk.Sig[:]) &&
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bytes.Equal(mock.Msg, pk.Msg)
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}
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return false
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}
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////////////////////////////////////////////
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// pubkey
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// PubKeyLedger works like a normal Ed25519 except a hash before the verify bytes
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type PubKeyLedger struct {
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crypto.PubKeyEd25519
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}
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// PubKeyLedgerFromBytes creates a PubKey from the raw bytes
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func PubKeyLedgerFromBytes(key [32]byte) crypto.PubKey {
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return PubKeyLedger{crypto.PubKeyEd25519(key)}.Wrap()
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}
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// VerifyBytes uses the normal Ed25519 algorithm but a sha512 hash beforehand
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func (pk PubKeyLedger) VerifyBytes(msg []byte, sig crypto.Signature) bool {
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hmsg := hashMsg(msg)
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return pk.PubKeyEd25519.VerifyBytes(hmsg, sig)
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}
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// Equals implements PubKey interface
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func (pk PubKeyLedger) Equals(other crypto.PubKey) bool {
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if ledger, ok := other.Unwrap().(PubKeyLedger); ok {
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return bytes.Equal(pk.PubKeyEd25519[:], ledger.PubKeyEd25519[:])
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}
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return false
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}
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/*** registration with go-data ***/
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func init() {
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crypto.PrivKeyMapper.
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RegisterImplementation(&PrivKeyLedger{}, NameLedger, TypeLedger).
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RegisterImplementation(MockPrivKeyLedger{}, "mock-ledger", 0x11)
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crypto.PubKeyMapper.
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RegisterImplementation(PubKeyLedger{}, NameLedger, TypeLedger)
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}
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// Wrap fulfils interface for PrivKey struct
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func (pk *PrivKeyLedger) Wrap() crypto.PrivKey {
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return crypto.PrivKey{pk}
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}
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// Wrap fulfils interface for PrivKey struct
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func (pk MockPrivKeyLedger) Wrap() crypto.PrivKey {
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return crypto.PrivKey{pk}
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}
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// Wrap fulfils interface for PubKey struct
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func (pk PubKeyLedger) Wrap() crypto.PubKey {
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return crypto.PubKey{pk}
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}
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