求大神，如何从一笔交易的签名中还原出公钥？

如何从一笔交易的签名中还原出公钥，我尝试好几次最后还是没成功，求大神指教

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2 个回答

枫叶? - 开发工程师 2024-02-14 15:39

xiaoyangguang 2024-02-15 16:33

```
package main

import (
    "bytes"
    "crypto/ecdsa"
    "fmt"
    "log"

"github.com/ethereum/go-ethereum/common/hexutil"
    "github.com/ethereum/go-ethereum/crypto"
)

func main() {
    privateKey, err := crypto.HexToECDSA("fad9c8855b740a0b7ed4c221dbad0f33a83a49cad6b3fe8d5817ac83d38b6a19")
    if err != nil {
        log.Fatal(err)
    }

publicKey := privateKey.Public()
    publicKeyECDSA, ok := publicKey.(*ecdsa.PublicKey)
    if !ok {
        log.Fatal("cannot assert type: publicKey is not of type *ecdsa.PublicKey")
    }

publicKeyBytes := crypto.FromECDSAPub(publicKeyECDSA)

data := []byte("hello")
    hash := crypto.Keccak256Hash(data)
    fmt.Println(hash.Hex()) // 0x1c8aff950685c2ed4bc3174f3472287b56d9517b9c948127319a09a7a36deac8

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

fmt.Println(hexutil.Encode(signature)) // 0x789a80053e4927d0a898db8e065e948f5cf086e32f9ccaa54c1908e22ac430c62621578113ddbb62d509bf6049b8fb544ab06d36f916685a2eb8e57ffadde02301

sigPublicKey, err := crypto.Ecrecover(hash.Bytes(), signature)
    if err != nil {
        log.Fatal(err)
    }

matches := bytes.Equal(sigPublicKey, publicKeyBytes)
    fmt.Println(matches) // true

sigPublicKeyECDSA, err := crypto.SigToPub(hash.Bytes(), signature)
    if err != nil {
        log.Fatal(err)
    }

sigPublicKeyBytes := crypto.FromECDSAPub(sigPublicKeyECDSA)
    matches = bytes.Equal(sigPublicKeyBytes, publicKeyBytes)
    fmt.Println(matches) // true

signatureNoRecoverID := signature[:len(signature)-1] // remove recovery id
    verified := crypto.VerifySignature(publicKeyBytes, hash.Bytes(), signatureNoRecoverID)
    fmt.Println(verified) // true
}

```