ethers.js signature provides different signature than golang "go-ethereum"

Question

package main

import (
    "bytes"
    "crypto/ecdsa"
    "fmt"
    
    "github.com/ethereum/go-ethereum/common/hexutil"
    "github.com/ethereum/go-ethereum/crypto"
)

func main() {

    hexPrivateKey := "0xae78c8b502571dba876742437f8bc78b689cf8518356c0921393d89caaf284ce"
    dataToSign := "bou"

    privateKey, err := crypto.HexToECDSA(hexPrivateKey[2:])
    if err != nil {
        log.Fatal(err)
    }

    // keccak256 hash of the data
    dataBytes := []byte(dataToSign)
    hashData := crypto.Keccak256Hash(dataBytes)

    signatureBytes, err := crypto.Sign(hashData.Bytes(), privateKey)
    if err != nil {
        log.Fatal(err)
    }

    signature = hexutil.Encode(signatureBytes)

    fmt.Println(signature) // 0xc83d417a3b99535e784a72af0d9772c019c776aa0dfe4313c001a5548f6cf254477f5334c30da59531bb521278edc98f1959009253dda4ee9f63fe5562ead5aa00
}

const hexPrivateKey = "0xae78c8b502571dba876742437f8bc78b689cf8518356c0921393d89caaf284ce";
const signingKey = new ethers.utils.SigningKey(hexPrivateKey);

const signature = signingKey.signDigest(ethers.utils.id("bou"));
//{ r: '0xc83d417a3b99535e784a72af0d9772c019c776aa0dfe4313c001a5548f6cf254',
//  s: '0x477f5334c30da59531bb521278edc98f1959009253dda4ee9f63fe5562ead5aa',
//  _vs: '0x477f5334c30da59531bb521278edc98f1959009253dda4ee9f63fe5562ead5aa',
//  recoveryParam: 0,
//  v: 27 }

ethers.utils.joinSignature(signature);
// "0xc83d417a3b99535e784a72af0d9772c019c776aa0dfe4313c001a5548f6cf254477f5334c30da59531bb521278edc98f1959009253dda4ee9f63fe5562ead5aa1b"

As we see:

Go result: 0xc83d417a3b99535e784a72af0d9772c019c776aa0dfe4313c001a5548f6cf254477f5334c30da59531bb521278edc98f1959009253dda4ee9f63fe5562ead5aa00
signingKey.signDigest result: 0xc83d417a3b99535e784a72af0d9772c019c776aa0dfe4313c001a5548f6cf254477f5334c30da59531bb521278edc98f1959009253dda4ee9f63fe5562ead5aa1b

Their last one byte are different: 00 (Go) / 1b (signingKey.signDigest)

I don't know what went wrong that made them different.

https://github.com/ethers-io/ethers.js/issues/823#issuecomment-1692766895

Why joinSignature must return 0x1c or 0x1b?

ethers.js signature provides different signature than golang "go-ethereum"

0 Answers0