/
sign.go
56 lines (42 loc) · 1.23 KB
/
sign.go
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package tx_builder
import (
//"fmt"
"crypto/sha256"
"encoding/hex"
secp256k1 "github.com/bitnexty/secp256k1-go"
)
func SignTx(chainIdHex string, tx *Transaction, keyWif string) ([]byte, *Transaction, error) {
chainIdBytes, err := hex.DecodeString(chainIdHex)
if err != nil {
return nil, nil, err
}
txData := tx.Pack()
//fmt.Println("unsigned tx:", hex.EncodeToString(txData))
//fmt.Println("chain id:", chainIdHex)
s256 := sha256.New()
_, _ = s256.Write(chainIdBytes)
_, _ = s256.Write(txData)
digestData := s256.Sum(nil)
//fmt.Println("digest:", hex.EncodeToString(digestData))
keyHex, _ := WifKeyToHexKey(keyWif)
keyBytes, _ := hex.DecodeString(keyHex)
var txSig []byte
for {
txSig, err = secp256k1.BtsSign(digestData, keyBytes, true)
if err != nil {
return nil, nil, err
}
if txSig[0] < 128 && txSig[32] < 128 {
break
}
}
// tx data with sig
txBytesWithSig := make([]byte, 0)
txBytesWithSig = append(txBytesWithSig, txData...)
// sig count
txBytesWithSig = append(txBytesWithSig, PackVarInt(1)...)
txBytesWithSig = append(txBytesWithSig, PackVarInt(uint64(len(txSig)))...)
txBytesWithSig = append(txBytesWithSig, txSig...)
tx.Signatures = append(tx.Signatures, txSig)
return txSig, tx, nil
}