ETH与EOS签名与验签方法

      【此文为纯粹代码篇】，近期很多开发者涌入区块链行业，理论上来讲区块链技术和传统开发基础技术并没有太多区别，但是入门却是相当之难，原因也很简单，生态不够完善，资产不够全面，出了问题无处可寻。

      那，这也是我搭建BlocksBus技术论坛的目的，将生态做起来。      废话不多写，我们来贴ETH与EOS的签名与验签方法，BTC的等以后作者了解了再贴上来吧。代码为GoLang实现：

      ETH:

const (
signFormat = "\x19Ethereum Signed Message:\n%d%s"
)

func TestSignAndVerifty(t *testing.T) {
//xprv := "xprv9s21ZrQH143K3cYFCBJZvZakYE777MsEQu8NVkVyK86m4yeLQnr41C8vcHWtCSvpZsgUEwYXtELBZfvg4dh4HhS2xcktPi5BwSEz28xfhd9"
//EOSPrv := "5JrAtoHd6uQnX4nowRzEzuykb81uaLDzwvAvkgV61ACk1tam5K8"
//EOSPub := "EOS5f7NU3vMKt2mSrZtDpiJKRPFXNKZfjsP1V79eEXdZKf62LfvhU"
ETHPrv := "87f9bc3c6cd57f18a0143b6863d6b47d6364f1a1ba86eae0ce411097704d5d0d"
ETHAdd := "0x296Fd341F90508B6742701F4341D2027CdF5c86d"
data := "0x1234"

prvKey, _ := hex.DecodeString(ETHPrv)
sig, _ := SignWithEthWeb3(data, prvKey)
log.Println("sig:", sig)
unsignDataHashByte := crypto.Keccak256Hash(common.FromHex(data)).Bytes()
// 开始服务端签名验证
log.Println("verify sign:", verifySig(strings.ToLower(ETHAdd), sig, unsignDataHashByte))
}

// web3的协议规定，需要先做一次Keccak256Hash, 且在ETH链签名的数据均为16进制 0x开头格式
func SignWithEthWeb3(unsignData string, privateByte []byte) (signature string, err error) {
// 需要先做一次Hash
unsignDataHashByte := crypto.Keccak256Hash(common.FromHex(unsignData)).Bytes()
return SignWithEth(unsignDataHashByte, privateByte)
}

func SignWithEth(unsignData, privateKeyByte []byte) (signature string, err error) {
// web3签名需要加盐后做Hash，对hash数据进行签名
newUnsignData := fmt.Sprintf(signFormat, len(unsignData), unsignData)
unsignDataHash := crypto.Keccak256([]byte(newUnsignData))
key, err := crypto.ToECDSA(privateKeyByte)
if err != nil {
log.Println("sign ToECDSA err:", err.Error())
return "", err
}
signatureByte, err := crypto.Sign(unsignDataHash, key)
if err != nil {
log.Println("sign Sign err:", err.Error())
return "", err
}

// web逻辑
signatureByte[64] += 27
return hexutil.Encode(signatureByte), nil
}

// 验证签名
func verifySig(from, sigHex string, msg []byte) bool {
fromAddr := common.HexToAddress(from)
sig := hexutil.MustDecode(sigHex)
if sig[64] != 1 && sig[64] != 0 && sig[64] != 27 && sig[64] != 28 {
log.Println("in hexutil.MustDecode error.")
return false
}

if sig[64] != 1 && sig[64] != 0 {
sig[64] -= 27
}
pubKey, err := crypto.SigToPub(createSignHash(msg), sig)
if err != nil {
log.Println("in crypto.SigToPub error:", err.Error())
return false
}
recoveredAddr := crypto.PubkeyToAddress(*pubKey)
log.Println("recoveredAddr:", recoveredAddr.String())
return fromAddr == recoveredAddr
}

// 待签名数据生成符合格式的hash
func createSignHash(data []byte) []byte {
msg := fmt.Sprintf(signFormat, len(data), data)
return crypto.Keccak256([]byte(msg))
}

EOS:

func TestSignAndVerify(t *testing.T) {
//xprv := "xprv9s21ZrQH143K3cYFCBJZvZakYE777MsEQu8NVkVyK86m4yeLQnr41C8vcHWtCSvpZsgUEwYXtELBZfvg4dh4HhS2xcktPi5BwSEz28xfhd9"
//EOSPrv := "5JrAtoHd6uQnX4nowRzEzuykb81uaLDzwvAvkgV61ACk1tam5K8"
EOSPub := "EOS5f7NU3vMKt2mSrZtDpiJKRPFXNKZfjsP1V79eEXdZKf62LfvhU"
ETHPrv := "87f9bc3c6cd57f18a0143b6863d6b47d6364f1a1ba86eae0ce411097704d5d0d"
//ETHAdd := "0x296Fd341F90508B6742701F4341D2027CdF5c86d"

sig, _ := SignWithEos(ETHPrv, []byte("hello"))
log.Println("sig:", sig)

publicTest, _ := ecc.NewPublicKey(EOSPub)
log.Println("content:", len(publicTest.Content))
signature, err := ecc.NewSignature(sig)
if err != nil {
return
}
//hexStr := "3015a45941933194000000572d3ccdcd104b21640c21428837104b21640c2142888027ad9a22afa097e075090000000000044b455900000000164d463230313931313036303830323137393238373838"
//unsignData, _ := hex.DecodeString(hexStr)
verifyResult := signature.Verify(sigDigest([]byte("hello")), publicTest)
log.Println("verify result:", verifyResult)
}

func SignWithEos(privateKeyHex string, unsignData []byte) (signedData string, err error) {
wifFromETH, err := ConvertToWif(privateKeyHex)
if err != nil {
return "", err
}
privatekey, err := ecc.NewPrivateKey(wifFromETH.String())
if err != nil {
return "", err
}
signature, err := privatekey.Sign(sigDigest(unsignData))
if err != nil {
return "", err
}
return signature.String(), nil
}

func sigDigest(payload []byte) []byte {
h := sha256.New()
//_, _ = h.Write(chainID)
_, _ = h.Write(payload)
return h.Sum(nil)
}

      注意：

            使用到的代码库                  1、HDWallet -> 进行私钥管理                  2、eoscanada -> EOS的工具类                  3、go-ethereum -> ETH的工具类            EOS签名中sigDigest方法是缩水过的，eoscanada的sigDigest方法其实包含了chainId，这里需要注意      作者原文：ETH与EOS签名与验签方法