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avalanche.go
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avalanche.go
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/*******************************************************************************
* (c) 2018 - 2023 Zondax AG
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
// ********************************************************************************/
package ledger_avalanche_go
import (
"errors"
"fmt"
"github.com/btcsuite/btcd/btcec/v2"
"github.com/btcsuite/btcd/btcec/v2/ecdsa"
ledger_go "github.com/zondax/ledger-go"
)
// FindLedgerAvalancheApp FindLedgerAvalancheUserApp finds a Avax user app running in a ledger device
func FindLedgerAvalancheApp() (_ *LedgerAvalanche, rerr error) {
ledgerAdmin := ledger_go.NewLedgerAdmin()
ledgerAPI, err := ledgerAdmin.Connect(0)
if err != nil {
return nil, err
}
defer func() {
if rerr != nil {
ledgerAPI.Close()
}
}()
app := &LedgerAvalanche{ledgerAPI, VersionInfo{}}
appVersion, err := app.GetVersion()
if err != nil {
if err.Error() == "[APDU_CODE_CLA_NOT_SUPPORTED] CLA not supported" {
err = errors.New("are you sure the Avalanche app is open?")
}
return nil, err
}
if err := app.CheckVersion(*appVersion); err != nil {
return nil, err
}
return app, err
}
// Close closes a connection with the Avalanche user app
func (ledger *LedgerAvalanche) Close() error {
return ledger.api.Close()
}
// CheckVersion returns true if the App version is supported by this library
func (ledger *LedgerAvalanche) CheckVersion(ver VersionInfo) error {
version, err := ledger.GetVersion()
if err != nil {
return err
}
return CheckVersion(*version, ver)
}
// GetVersion returns the current version of the Avalanche user app
func (ledger *LedgerAvalanche) GetVersion() (*VersionInfo, error) {
message := []byte{CLA, INS_GET_VERSION, 0, 0, 0}
response, err := ledger.api.Exchange(message)
if err != nil {
return nil, err
}
if len(response) < 4 {
return nil, errors.New("invalid response")
}
ledger.version = VersionInfo{
AppMode: response[0],
Major: response[1],
Minor: response[2],
Patch: response[3],
}
return &ledger.version, nil
}
// GetPubKey returns the pubkey and hash
func (ledger *LedgerAvalanche) GetPubKey(path string, show bool, hrp string, chainid string) (*ResponseAddr, error) {
if len(hrp) > 83 {
return nil, errors.New("hrp len should be < 83 chars")
}
serializedHRP, err := SerializeHrp(hrp)
if err != nil {
return nil, err
}
serializedPath, err := SerializePath(path)
if err != nil {
return nil, err
}
serializedChainID, err := SerializeChainID(chainid)
if err != nil {
return nil, err
}
p1 := byte(P1_ONLY_RETRIEVE)
if show {
p1 = byte(P1_SHOW_ADDRESS_IN_DEVICE)
}
// Prepare message
payload := []byte{CLA, INS_GET_ADDR, p1, 0, 0}
headerLen := len(payload)
payload = append(payload, serializedHRP...)
payload = append(payload, serializedChainID...)
payload = append(payload, serializedPath...)
payload[4] = byte(len(payload) - headerLen) // update length
response, err := ledger.api.Exchange(payload)
if err != nil {
return nil, err
}
if len(response) < 35+len(hrp) {
return nil, errors.New("Invalid response")
}
// [publicKeyLen | publicKey | hash | address | errorCode]
publicKeyLen := response[0]
publicKey := append([]byte{}, response[1:publicKeyLen+1]...)
hash := append([]byte{}, response[publicKeyLen+1:publicKeyLen+1+20]...)
address := string(response[publicKeyLen+1+20:])
return &ResponseAddr{publicKey, hash, address}, nil
}
// GetExtPubKey returns the extended pubkey
func (ledger *LedgerAvalanche) GetExtPubKey(path string, show bool, hrp string, chainid string) ([]byte, []byte, error) {
if len(hrp) > 83 {
return nil, nil, errors.New("hrp len should be < 83 chars")
}
serializedHRP, err := SerializeHrp(hrp)
if err != nil {
return nil, nil, err
}
serializedPath, err := SerializePath(path)
if err != nil {
return nil, nil, err
}
serializedChainID, err := SerializeChainID(chainid)
if err != nil {
return nil, nil, err
}
p1 := byte(P1_ONLY_RETRIEVE)
if show {
p1 = byte(P1_SHOW_ADDRESS_IN_DEVICE)
}
// Prepare message
payload := []byte{CLA, INS_GET_EXTENDED_PUBLIC_KEY, p1, 0, 0}
headerLen := len(payload)
payload = append(payload, serializedHRP...)
payload = append(payload, serializedChainID...)
payload = append(payload, serializedPath...)
payload[4] = byte(len(payload) - headerLen) // update length
response, err := ledger.api.Exchange(payload)
if err != nil {
return nil, nil, err
}
if len(response) < 32 {
return nil, nil, errors.New("Invalid response")
}
publicKeyLen := response[0]
publicKey := append([]byte{}, response[1:publicKeyLen+1]...)
chainCode := append([]byte{}, response[publicKeyLen+1:]...)
return publicKey, chainCode, nil
}
func (ledger *LedgerAvalanche) Sign(pathPrefix string, signingPaths []string, message []byte, changePaths []string) (*ResponseSign, error) {
paths := signingPaths
if changePaths != nil {
paths = append(paths, changePaths...)
paths = RemoveDuplicates(paths)
}
serializedPath, err := SerializePath(pathPrefix)
if err != nil {
return nil, err
}
payloadType := PAYLOAD_INIT
p2 := FIRST_MESSAGE
payload := []byte{CLA, INS_SIGN, byte(payloadType), byte(p2), byte(len(serializedPath))}
payload = append(payload, serializedPath...)
_, err = ledger.api.Exchange(payload)
if err != nil {
return nil, errors.New("command rejected")
}
msg := ConcatMessageAndChangePath(message, paths)
for i := 0; i < len(msg); i += CHUNK_SIZE {
end := i + CHUNK_SIZE
payloadType := PAYLOAD_ADD
p2 := 0
if end > len(msg) {
end = len(msg)
payloadType = PAYLOAD_LAST
}
chunk := msg[i:end]
chunkSize := end - i
payload := []byte{CLA, INS_SIGN, byte(payloadType), byte(p2), byte(chunkSize)}
payload = append(payload, chunk...)
response, err := ledger.api.Exchange(payload)
if err != nil {
if err.Error() == "[APDU_CODE_BAD_KEY_HANDLE] The parameters in the data field are incorrect" {
// In this special case, we can extract additional info
return nil, fmt.Errorf("%w extra_info=(%s)", err, string(response))
}
if err.Error() == "[APDU_CODE_DATA_INVALID] Referenced data reversibly blocked (invalidated)" {
return nil, fmt.Errorf("%w extra_info=(%s)", err, string(response))
}
return nil, err
}
}
// Transaction was approved so start iterating over signing_paths to sign
// and collect each signature
return SignAndCollect(signingPaths, ledger)
}
func (ledger *LedgerAvalanche) SignHash(pathPrefix string, signingPaths []string, hash []byte) (*ResponseSign, error) {
if len(hash) != HASH_LEN {
return nil, errors.New("wrong hash size")
}
serializedPath, err := SerializePath(pathPrefix)
if err != nil {
return nil, err
}
payload := []byte{CLA, INS_SIGN_HASH, FIRST_MESSAGE, byte(0x00), byte(len(serializedPath) + len(hash))}
payload = append(payload, serializedPath...)
payload = append(payload, hash...)
firstResponse, err := ledger.api.Exchange(payload)
if err != nil {
return nil, errors.New("command rejected")
}
if len(firstResponse) != 0 {
return nil, errors.New("wrong response")
}
return SignAndCollect(signingPaths, ledger)
}
func SignAndCollect(signingPaths []string, ledger *LedgerAvalanche) (*ResponseSign, error) {
// Where each pair path_suffix, signature are stored
signatures := make(map[string][]byte)
for idx, suffix := range signingPaths {
pathBuf, err := SerializePathSuffix(suffix)
if err != nil {
return nil, err
}
p1 := LAST_MESSAGE
if idx < len(signingPaths)-1 {
p1 = NEXT_MESSAGE
}
// Send path to sign hash that should be in device's ram memory
payload := []byte{CLA, INS_SIGN_HASH, byte(p1), byte(0x00), byte(len(pathBuf))}
payload = append(payload, pathBuf...)
response, err := ledger.api.Exchange(payload)
if err != nil {
return nil, err
}
signatures[suffix] = response
}
return &ResponseSign{nil, signatures}, nil
}
func (ledger *LedgerAvalanche) VerifyMultipleSignatures(response ResponseSign, messageHash []byte, rootPath string, signingPaths []string, hrp string, chainID string) error {
if len(response.Signature) != len(signingPaths) {
return errors.New("sizes of signatures and paths don't match")
}
for _, suffix := range signingPaths {
path := fmt.Sprintf("%s/%s", rootPath, suffix)
addr, err := ledger.GetPubKey(path, false, hrp, chainID)
if err != nil {
return errors.New("error getting the pubkey")
}
hexString := fmt.Sprintf("%x", addr.PublicKey)
fmt.Println(hexString)
sigLen := len(response.Signature[suffix])
verified := VerifySignature(addr.PublicKey, messageHash, response.Signature[suffix][:sigLen-1])
if !verified {
return errors.New("[VerifySig] Error verifying signature: ")
}
}
return nil
}
// VerifySignature checks that the given public key created signature over hash.
// The public key should be in compressed (33 bytes) or uncompressed (65 bytes) format.
// The signature should have the 64 byte [R || S] format.
func VerifySignature(pubkey, hash, signature []byte) bool {
if len(signature) != 64 {
return false
}
var r, s btcec.ModNScalar
if r.SetByteSlice(signature[:32]) {
return false // overflow
}
if s.SetByteSlice(signature[32:]) {
return false
}
sig := ecdsa.NewSignature(&r, &s)
key, err := btcec.ParsePubKey(pubkey)
if err != nil {
return false
}
// Reject malleable signatures. libsecp256k1 does this check but btcec doesn't.
if s.IsOverHalfOrder() {
return false
}
return sig.Verify(hash, key)
}