You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
294 lines
8.1 KiB
294 lines
8.1 KiB
package nano
|
|
|
|
import (
|
|
"bytes"
|
|
"encoding/hex"
|
|
|
|
"github.com/pkg/errors"
|
|
|
|
ledger "github.com/ethanfrey/ledger"
|
|
|
|
crypto "github.com/tendermint/go-crypto"
|
|
amino "github.com/tendermint/go-amino"
|
|
)
|
|
|
|
//nolint
|
|
const (
|
|
NameLedgerEd25519 = "ledger-ed25519"
|
|
TypeLedgerEd25519 = 0x10
|
|
|
|
// Timeout is the number of seconds to wait for a response from the ledger
|
|
// if eg. waiting for user confirmation on button push
|
|
Timeout = 20
|
|
)
|
|
|
|
var device *ledger.Ledger
|
|
|
|
// getLedger gets a copy of the device, and caches it
|
|
func getLedger() (*ledger.Ledger, error) {
|
|
var err error
|
|
if device == nil {
|
|
device, err = ledger.FindLedger()
|
|
}
|
|
return device, err
|
|
}
|
|
|
|
func signLedger(device *ledger.Ledger, msg []byte) (pub crypto.PubKey, sig crypto.Signature, err error) {
|
|
var resp []byte
|
|
|
|
packets := generateSignRequests(msg)
|
|
for _, pack := range packets {
|
|
resp, err = device.Exchange(pack, Timeout)
|
|
if err != nil {
|
|
return pub, sig, err
|
|
}
|
|
}
|
|
|
|
// the last call is the result we want and needs to be parsed
|
|
key, bsig, err := parseDigest(resp)
|
|
if err != nil {
|
|
return pub, sig, err
|
|
}
|
|
|
|
var b [32]byte
|
|
copy(b[:], key)
|
|
return PubKeyLedgerEd25519FromBytes(b), crypto.SignatureEd25519FromBytes(bsig), nil
|
|
}
|
|
|
|
// PrivKeyLedgerEd25519 implements PrivKey, calling the ledger nano
|
|
// we cache the PubKey from the first call to use it later
|
|
type PrivKeyLedgerEd25519 struct {
|
|
// PubKey should be private, but we want to encode it via go-amino
|
|
// so we can view the address later, even without having the ledger
|
|
// attached
|
|
CachedPubKey crypto.PubKey
|
|
}
|
|
|
|
// NewPrivKeyLedgerEd25519 will generate a new key and store the
|
|
// public key for later use.
|
|
func NewPrivKeyLedgerEd25519() (crypto.PrivKey, error) {
|
|
var pk PrivKeyLedgerEd25519
|
|
// getPubKey will cache the pubkey for later use,
|
|
// this allows us to return an error early if the ledger
|
|
// is not plugged in
|
|
_, err := pk.getPubKey()
|
|
return pk.Wrap(), err
|
|
}
|
|
|
|
// ValidateKey allows us to verify the sanity of a key
|
|
// after loading it from disk
|
|
func (pk *PrivKeyLedgerEd25519) ValidateKey() error {
|
|
// getPubKey will return an error if the ledger is not
|
|
// properly set up...
|
|
pub, err := pk.forceGetPubKey()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
// verify this matches cached address
|
|
if !pub.Equals(pk.CachedPubKey) {
|
|
return errors.New("ledger doesn't match cached key")
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// AssertIsPrivKeyInner fulfils PrivKey Interface
|
|
func (pk *PrivKeyLedgerEd25519) AssertIsPrivKeyInner() {}
|
|
|
|
// Bytes fulfils PrivKey Interface - but it stores the cached pubkey so we can verify
|
|
// the same key when we reconnect to a ledger
|
|
func (pk *PrivKeyLedgerEd25519) Bytes() []byte {
|
|
return amino.BinaryBytes(pk.Wrap())
|
|
}
|
|
|
|
// Sign calls the ledger and stores the PubKey for future use
|
|
//
|
|
// XXX/TODO: panics if there is an error communicating with the ledger.
|
|
//
|
|
// Communication is checked on NewPrivKeyLedger and PrivKeyFromBytes,
|
|
// returning an error, so this should only trigger if the privkey is held
|
|
// in memory for a while before use.
|
|
func (pk *PrivKeyLedgerEd25519) Sign(msg []byte) crypto.Signature {
|
|
// oh, I wish there was better error handling
|
|
dev, err := getLedger()
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
|
|
pub, sig, err := signLedger(dev, msg)
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
|
|
// if we have no pubkey yet, store it for future queries
|
|
if pk.CachedPubKey.Empty() {
|
|
pk.CachedPubKey = pub
|
|
} else if !pk.CachedPubKey.Equals(pub) {
|
|
panic("signed with a different key than stored")
|
|
}
|
|
return sig
|
|
}
|
|
|
|
// PubKey returns the stored PubKey
|
|
// TODO: query the ledger if not there, once it is not volatile
|
|
func (pk *PrivKeyLedgerEd25519) PubKey() crypto.PubKey {
|
|
key, err := pk.getPubKey()
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
return key
|
|
}
|
|
|
|
// getPubKey reads the pubkey from cache or from the ledger itself
|
|
// since this involves IO, it may return an error, which is not exposed
|
|
// in the PubKey interface, so this function allows better error handling
|
|
func (pk *PrivKeyLedgerEd25519) getPubKey() (key crypto.PubKey, err error) {
|
|
// if we have no pubkey, set it
|
|
if pk.CachedPubKey.Empty() {
|
|
pk.CachedPubKey, err = pk.forceGetPubKey()
|
|
}
|
|
return pk.CachedPubKey, err
|
|
}
|
|
|
|
// forceGetPubKey is like getPubKey but ignores any cached key
|
|
// and ensures we get it from the ledger itself.
|
|
func (pk *PrivKeyLedgerEd25519) forceGetPubKey() (key crypto.PubKey, err error) {
|
|
dev, err := getLedger()
|
|
if err != nil {
|
|
return key, errors.New("Can't connect to ledger device")
|
|
}
|
|
key, _, err = signLedger(dev, []byte{0})
|
|
if err != nil {
|
|
return key, errors.New("Please open cosmos app on the ledger")
|
|
}
|
|
return key, err
|
|
}
|
|
|
|
// Equals fulfils PrivKey Interface - makes sure both keys refer to the
|
|
// same
|
|
func (pk *PrivKeyLedgerEd25519) Equals(other crypto.PrivKey) bool {
|
|
if ledger, ok := other.Unwrap().(*PrivKeyLedgerEd25519); ok {
|
|
return pk.CachedPubKey.Equals(ledger.CachedPubKey)
|
|
}
|
|
return false
|
|
}
|
|
|
|
// MockPrivKeyLedgerEd25519 behaves as the ledger, but stores a pre-packaged call-response
|
|
// for use in test cases
|
|
type MockPrivKeyLedgerEd25519 struct {
|
|
Msg []byte
|
|
Pub [KeyLength]byte
|
|
Sig [SigLength]byte
|
|
}
|
|
|
|
// NewMockKey returns
|
|
func NewMockKey(msg, pubkey, sig string) (pk MockPrivKeyLedgerEd25519) {
|
|
var err error
|
|
pk.Msg, err = hex.DecodeString(msg)
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
|
|
bpk, err := hex.DecodeString(pubkey)
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
bsig, err := hex.DecodeString(sig)
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
|
|
copy(pk.Pub[:], bpk)
|
|
copy(pk.Sig[:], bsig)
|
|
return pk
|
|
}
|
|
|
|
var _ crypto.PrivKeyInner = MockPrivKeyLedgerEd25519{}
|
|
|
|
// AssertIsPrivKeyInner fulfils PrivKey Interface
|
|
func (pk MockPrivKeyLedgerEd25519) AssertIsPrivKeyInner() {}
|
|
|
|
// Bytes fulfils PrivKey Interface - not supported
|
|
func (pk MockPrivKeyLedgerEd25519) Bytes() []byte {
|
|
return nil
|
|
}
|
|
|
|
// Sign returns a real SignatureLedger, if the msg matches what we expect
|
|
func (pk MockPrivKeyLedgerEd25519) Sign(msg []byte) crypto.Signature {
|
|
if !bytes.Equal(pk.Msg, msg) {
|
|
panic("Mock key is for different msg")
|
|
}
|
|
return crypto.SignatureEd25519(pk.Sig).Wrap()
|
|
}
|
|
|
|
// PubKey returns a real PubKeyLedgerEd25519, that will verify this signature
|
|
func (pk MockPrivKeyLedgerEd25519) PubKey() crypto.PubKey {
|
|
return PubKeyLedgerEd25519FromBytes(pk.Pub)
|
|
}
|
|
|
|
// Equals compares that two Mocks have the same data
|
|
func (pk MockPrivKeyLedgerEd25519) Equals(other crypto.PrivKey) bool {
|
|
if mock, ok := other.Unwrap().(MockPrivKeyLedgerEd25519); ok {
|
|
return bytes.Equal(mock.Pub[:], pk.Pub[:]) &&
|
|
bytes.Equal(mock.Sig[:], pk.Sig[:]) &&
|
|
bytes.Equal(mock.Msg, pk.Msg)
|
|
}
|
|
return false
|
|
}
|
|
|
|
////////////////////////////////////////////
|
|
// pubkey
|
|
|
|
// PubKeyLedgerEd25519 works like a normal Ed25519 except a hash before the verify bytes
|
|
type PubKeyLedgerEd25519 struct {
|
|
crypto.PubKeyEd25519
|
|
}
|
|
|
|
// PubKeyLedgerEd25519FromBytes creates a PubKey from the raw bytes
|
|
func PubKeyLedgerEd25519FromBytes(key [32]byte) crypto.PubKey {
|
|
return PubKeyLedgerEd25519{crypto.PubKeyEd25519(key)}.Wrap()
|
|
}
|
|
|
|
// Bytes fulfils pk Interface - no data, just type info
|
|
func (pk PubKeyLedgerEd25519) Bytes() []byte {
|
|
return amino.BinaryBytes(pk.Wrap())
|
|
}
|
|
|
|
// VerifyBytes uses the normal Ed25519 algorithm but a sha512 hash beforehand
|
|
func (pk PubKeyLedgerEd25519) VerifyBytes(msg []byte, sig crypto.Signature) bool {
|
|
hmsg := hashMsg(msg)
|
|
return pk.PubKeyEd25519.VerifyBytes(hmsg, sig)
|
|
}
|
|
|
|
// Equals implements PubKey interface
|
|
func (pk PubKeyLedgerEd25519) Equals(other crypto.PubKey) bool {
|
|
if ledger, ok := other.Unwrap().(PubKeyLedgerEd25519); ok {
|
|
return pk.PubKeyEd25519.Equals(ledger.PubKeyEd25519.Wrap())
|
|
}
|
|
return false
|
|
}
|
|
|
|
/*** registration with go-data ***/
|
|
|
|
func init() {
|
|
crypto.PrivKeyMapper.
|
|
RegisterImplementation(&PrivKeyLedgerEd25519{}, NameLedgerEd25519, TypeLedgerEd25519).
|
|
RegisterImplementation(MockPrivKeyLedgerEd25519{}, "mock-ledger", 0x11)
|
|
|
|
crypto.PubKeyMapper.
|
|
RegisterImplementation(PubKeyLedgerEd25519{}, NameLedgerEd25519, TypeLedgerEd25519)
|
|
}
|
|
|
|
// Wrap fulfils interface for PrivKey struct
|
|
func (pk *PrivKeyLedgerEd25519) Wrap() crypto.PrivKey {
|
|
return crypto.PrivKey{PrivKeyInner: pk}
|
|
}
|
|
|
|
// Wrap fulfils interface for PrivKey struct
|
|
func (pk MockPrivKeyLedgerEd25519) Wrap() crypto.PrivKey {
|
|
return crypto.PrivKey{PrivKeyInner: pk}
|
|
}
|
|
|
|
// Wrap fulfils interface for PubKey struct
|
|
func (pk PubKeyLedgerEd25519) Wrap() crypto.PubKey {
|
|
return crypto.PubKey{PubKeyInner: pk}
|
|
}
|