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dogecoin.go
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dogecoin.go
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package sign
import (
"bytes"
"crypto/elliptic"
"crypto/sha256"
"encoding/hex"
"errors"
"fmt"
"github.com/btcsuite/btcd/btcutil"
"github.com/dotbitHQ/das-lib/common"
"github.com/ethereum/go-ethereum/crypto"
)
func magicHash(data []byte) ([]byte, error) {
l := len(data)
if l == 0 {
return nil, fmt.Errorf("invalid raw data")
}
data = append(append([]byte(common.DogeMessageHeader), byte(l)), data...)
//fmt.Println(hex.EncodeToString(data))
h1 := sha256.New()
h1.Write(data)
data = h1.Sum(nil)
//fmt.Println(hex.EncodeToString(data))
h2 := sha256.New()
h2.Write(data)
data = h2.Sum(nil)
//fmt.Println(hex.EncodeToString(data))
return data, nil
}
func DogeSignature(data []byte, hexPrivateKey string, compress bool) ([]byte, error) {
bys, err := magicHash(data)
if err != nil {
return nil, fmt.Errorf("magicHash err: %s", err.Error())
}
//fmt.Println("magicHash:", common.Bytes2Hex(bys))
log.Info("magicHash:", common.Bytes2Hex(bys))
key, err := crypto.HexToECDSA(hexPrivateKey)
if err != nil {
return nil, fmt.Errorf("crypto.HexToECDSA err: %s", err.Error())
}
sig, err := crypto.Sign(bys, key)
if err != nil {
return nil, fmt.Errorf("crypto.Sign err: %s", err.Error())
}
if compress {
sig = append(sig, []byte{1}...)
} else {
sig = append(sig, []byte{0}...)
}
log.Info("DogeSignature:", common.Bytes2Hex(sig))
return sig, nil
}
func VerifyDogeSignature(sig []byte, data []byte, payload string) (bool, error) {
bys, err := magicHash(data)
if err != nil {
return false, fmt.Errorf("magicHash err: %s", err.Error())
}
log.Info("magicHash:", common.Bytes2Hex(bys))
if len(sig) != 66 { // sign check
return false, fmt.Errorf("invalid param")
}
if sig[64] >= 27 {
sig[64] -= 27
}
if bytes.Compare(sig[65:66], []byte{1}) == 0 { // compressed
sigToPub, err := crypto.SigToPub(bys, sig[:65])
if err != nil {
return false, fmt.Errorf("crypto.SigToPub err: %s", err.Error())
}
compressPublicKey := elliptic.MarshalCompressed(sigToPub.Curve, sigToPub.X, sigToPub.Y)
log.Info("compressPublicKey:", common.Bytes2Hex(compressPublicKey))
resPayload := hex.EncodeToString(btcutil.Hash160(compressPublicKey))
log.Info("VerifyDogeSignature:", resPayload)
return resPayload == payload, nil
} else {
pub, err := crypto.Ecrecover(bys, sig[:65])
if err != nil {
return false, fmt.Errorf("crypto.Ecrecover err: %s", err.Error())
}
log.Info("publicKey:", common.Bytes2Hex(pub), len(pub))
resPayload := hex.EncodeToString(btcutil.Hash160(pub))
log.Info("VerifyDogeSignature:", resPayload)
return resPayload == payload, nil
}
}
type SegwitType int
const (
P2WPKH SegwitType = iota
P2SH_P2WPKH
)
type SignatureInfo struct {
Compressed bool
SegwitType *SegwitType
Recovery int
Signature []byte
}
func DecodeSignature(buffer []byte) (*SignatureInfo, error) {
if len(buffer) != 65 {
return nil, errors.New("invalid signature length")
}
flagByte := int(buffer[0]) - 27
if flagByte > 15 || flagByte < 0 {
return nil, errors.New("invalid signature parameter")
}
var segwitType *SegwitType = nil
if (flagByte & 8) != 0 {
if (flagByte & 4) != 0 {
segwitType = new(SegwitType)
*segwitType = P2WPKH
} else {
segwitType = new(SegwitType)
*segwitType = P2SH_P2WPKH
}
}
return &SignatureInfo{
Compressed: (flagByte & 12) != 0,
SegwitType: segwitType,
Recovery: flagByte & 3,
Signature: buffer[1:],
}, nil
}
func (s *SignatureInfo) ToSig() []byte {
res := append(s.Signature, byte(s.Recovery))
if s.Compressed {
res = append(res, byte(1))
} else {
res = append(res, byte(0))
}
//if s.SegwitType == nil {
// res = append(res, byte(0))
//} else {
// switch *s.SegwitType {
// case P2WPKH:
// res = append(res, byte(0))
// case P2SH_P2WPKH:
// res = append(res, byte(1))
// default:
// res = append(res, byte(0))
// }
//}
return res
}