/
transaction.go
257 lines (192 loc) · 7.11 KB
/
transaction.go
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// This file is part of Ark Go Crypto.
//
// (c) Ark Ecosystem <info@ark.io>
//
// For the full copyright and license information, please view the LICENSE
// file that was distributed with this source code.
package crypto
import (
"crypto/sha256"
"encoding/json"
"fmt"
"log"
"github.com/fatih/structs"
)
func (transaction *Transaction) GetId() string {
return fmt.Sprintf("%x", sha256.Sum256(transaction.serialize(true, true, true)))
}
func (transaction *Transaction) Sign(passphrase string) {
privateKey, _ := PrivateKeyFromPassphrase(passphrase)
transaction.SenderPublicKey = HexEncode(privateKey.PublicKey.Serialize())
hash := sha256.Sum256(transaction.serialize(false, false, false))
signature, err := privateKey.Sign(hash[:])
if err == nil {
transaction.Signature = HexEncode(signature)
}
}
func (transaction *Transaction) SignMulti(signerIndex int, passphrase string) {
privateKey, _ := PrivateKeyFromPassphrase(passphrase)
hash := sha256.Sum256(transaction.serialize(false, false, false))
signature, err := privateKey.Sign(hash[:])
if err == nil {
var signatureWithIndex []byte
signatureWithIndex = append(signatureWithIndex, byte(signerIndex))
signatureWithIndex = append(signatureWithIndex, signature...)
transaction.Signatures = append(transaction.Signatures, HexEncode(signatureWithIndex))
}
}
func (transaction *Transaction) SecondSign(passphrase string) {
privateKey, _ := PrivateKeyFromPassphrase(passphrase)
hash := sha256.Sum256(transaction.serialize(true, false, false))
signature, err := privateKey.Sign(hash[:])
if err == nil {
transaction.SecondSignature = HexEncode(signature)
}
}
func (transaction *Transaction) VerifyMultiSignature(multiSignatureAsset *MultiSignatureRegistrationAsset) (bool, error) {
hash := sha256.Sum256(transaction.serialize(false, false, false))
publicKeyIndexes := make(map[int]bool)
numVerified := 0
for i := 0; i < len(transaction.Signatures); i++ {
publicKeyIndex := int(HexDecode(transaction.Signatures[i][:2])[0])
signature := HexDecode(transaction.Signatures[i][2:])
if publicKeyIndexes[publicKeyIndex] {
return false, fmt.Errorf("VerifyMultiSignature: duplicate signer index: %d", publicKeyIndex)
}
if publicKeyIndex >= len(multiSignatureAsset.PublicKeys) {
return false, fmt.Errorf(
"VerifyMultiSignature: signer index too large: %d, total of %d " +
"signers have been registered",
publicKeyIndex, len(multiSignatureAsset.PublicKeys))
}
publicKeyIndexes[publicKeyIndex] = true
publicKey, err := PublicKeyFromBytes(HexDecode(multiSignatureAsset.PublicKeys[publicKeyIndex]))
if err != nil {
return false, err
}
verified, err := publicKey.Verify(signature, hash[:])
if verified && err == nil {
numVerified++
}
if numVerified >= int(multiSignatureAsset.Min) {
return true, nil
}
if len(transaction.Signatures) - (i + 1 - numVerified) < int(multiSignatureAsset.Min) {
return false, fmt.Errorf(
"VerifyMultiSignature: less than the minimum %d signatures verified successfully",
multiSignatureAsset.Min)
}
}
return false, fmt.Errorf(
"VerifyMultiSignature: less than the minimum %d signatures verified successfully (checked all)",
multiSignatureAsset.Min)
}
func (transaction *Transaction) Verify(multiSignatureAsset ...*MultiSignatureRegistrationAsset) (bool, error) {
if len(multiSignatureAsset) == 1 && multiSignatureAsset[0].Min > 0 {
return transaction.VerifyMultiSignature(multiSignatureAsset[0])
}
publicKey, err := PublicKeyFromBytes(HexDecode(transaction.SenderPublicKey))
if err != nil {
return false, err
}
hash := sha256.Sum256(transaction.serialize(false, false, true))
return publicKey.Verify(HexDecode(transaction.Signature), hash[:])
}
func (transaction *Transaction) SecondVerify(secondPublicKey *PublicKey) (bool, error) {
hash := sha256.Sum256(transaction.serialize(true, false, false))
return secondPublicKey.Verify(HexDecode(transaction.SecondSignature), hash[:])
}
func isSchnorrSignature(length int) bool {
// Logic copied from
// https://github.com/ArkEcosystem/core/blob/0663b0f/packages/crypto/src/transactions/deserializer.ts#L173
// length is in number of bytes (raw / binary)
return (
length == 64 || // signature
length == 128 || // signature + secondSignature
length % 65 == 0 || // `signatures` of a multi signature transaction, type != MultiSignatureRegistration (4)
length % 65 == 64 || // type == MultiSignatureRegistration (4)
length % 65 == 63) // type == MultiSignatureRegistration (4) + secondSignature
}
func ECDSASignatureLen(signature []byte) int {
return int(signature[1] + 2)
}
func beginningMultiSignature(signature []byte) bool {
return signature[0] == 0xFF
}
func (transaction *Transaction) ParseSignaturesECDSA(signatures []byte) *Transaction {
signaturesLen := len(signatures)
firstSignatureLen := ECDSASignatureLen(signatures)
transaction.Signature = HexEncode(signatures[:firstSignatureLen])
o := firstSignatureLen
if o == signaturesLen {
return transaction
}
if !beginningMultiSignature(signatures[o:]) {
secondSignatureLen := ECDSASignatureLen(signatures[o:])
transaction.SecondSignature = HexEncode(signatures[o:o + secondSignatureLen])
o += secondSignatureLen
}
if o == signaturesLen {
return transaction
}
if o != signaturesLen {
log.Fatal("All signatures parsed, but ", signaturesLen - o,
" bytes remain in the buffer: ", HexEncode(signatures))
}
return transaction
}
func (transaction *Transaction) ParseSignaturesSchnorr(signatures []byte) *Transaction {
const schnorrSignatureLen = 64
signaturesLen := len(signatures)
o := 0
canReadNonMultiSignature := func () bool {
remaining := signaturesLen - o
return remaining >= schnorrSignatureLen && remaining % 65 != 0
}
readSchnorrSignature := func () string {
sig := HexEncode(signatures[o:o + schnorrSignatureLen])
o += schnorrSignatureLen
return sig
}
if canReadNonMultiSignature() {
transaction.Signature = readSchnorrSignature()
}
if canReadNonMultiSignature() {
transaction.SecondSignature = readSchnorrSignature()
}
if signaturesLen - o == 0 {
return transaction
}
if (signaturesLen - o) % 65 != 0 {
log.Fatalf("Cannot parse Schnorr signatures: remaining bytes not multiple of 65: %d", signaturesLen - o)
}
count := (signaturesLen - o) / 65
for i := 0; i < count; i++ {
signaturePlusPrefix := HexEncode(signatures[o:o + 1 + schnorrSignatureLen])
o += 1 + schnorrSignatureLen
transaction.Signatures = append(transaction.Signatures, signaturePlusPrefix)
}
return transaction
}
func (transaction *Transaction) ParseSignatures(sigOffset int) *Transaction {
signatures := transaction.Serialized[sigOffset:]
signaturesLen := len(signatures)
if signaturesLen == 0 {
transaction.Signature = ""
return transaction
}
if isSchnorrSignature(signaturesLen) {
return transaction.ParseSignaturesSchnorr(signatures)
}
return transaction.ParseSignaturesECDSA(signatures)
}
func (transaction *Transaction) ToMap() map[string]interface{} {
return structs.Map(transaction)
}
func (transaction *Transaction) ToJson() (string, error) {
jason, err := json.Marshal(transaction)
if err != nil {
return "", err
}
return string(jason), nil
}