Go将pem公钥转换为ethereum地址

Question

我有由AWS生成的ECC_SECG_P256K1公钥PEM文件。

我想通过Go将pem公钥转换成ethereum地址。

我怎么才能拿到呢？

样本Pem数据

-----BEGIN PUBLIC KEY-----
MFYwEAYHKoZIzj0CAQYFK4EEAAoDQgAEjgRz1kswP5KV4diFvYGegDVjeTIABq0a
82r4T41Wz94LDApF9OGyZsUSoQ59gaEVQark4mEQGQqV9HHQzlPavQ==
-----END PUBLIC KEY-----

我试过这个代码。(x，y返回0)

var pemData = []byte(`MFYwEAYHKoZIzj0CAQYFK4EEAAoDQgAEjgRz1kswP5KV4diFvYGegDVjeTIABq0a82r4T41Wz94LDApF9OGyZsUSoQ59gaEVQark4mEQGQqV9HHQzlPavQ==`)
x,y := elliptic.UnmarshalCompressed(elliptic.P256(),pemData)
pubkey := elliptic.Marshal(secp256k1.S256(), x, y)

Answer 1

如果这个键是由默认库支持的一些曲线生成的，您可以直接使用ParsePKIXPublicKey来解析它。但是，默认库不支持Secp256k1曲线。因此，我的解决方案是从lib复制代码，然后手动获取x和y，然后使用获取地址，并检查曲线上是否有点。

import (
    "crypto/ecdsa"
    "crypto/x509/pkix"
    "encoding/asn1"
    "encoding/hex"
    "encoding/pem"
    "fmt"
    "math/big"
    crypto "github.com/ethereum/go-ethereum/crypto"
)

type publicKeyInfo struct {
    Raw       asn1.RawContent
    Algorithm pkix.AlgorithmIdentifier
    PublicKey asn1.BitString
}
func main() {
    pemData := []byte(`-----BEGIN PUBLIC KEY-----
MFYwEAYHKoZIzj0CAQYFK4EEAAoDQgAEjgRz1kswP5KV4diFvYGegDVjeTIABq0a
82r4T41Wz94LDApF9OGyZsUSoQ59gaEVQark4mEQGQqV9HHQzlPavQ==
-----END PUBLIC KEY-----`)
    // better to read directly from file:
    // pemData, err := os.ReadFile("your_pub_file.pem") // just pass the file name
    // if err != nil {
    //  fmt.Print(err)
    // }
    block, _ := pem.Decode(pemData)
    if block == nil {
        panic("failed to parse PEM block containing the public key")
    }
    var pki publicKeyInfo
    asn1.Unmarshal(block.Bytes, &pki)
    asn1Data := pki.PublicKey.RightAlign()
    _, x, y := asn1Data[0], asn1Data[1:33], asn1Data[33:]
    fmt.Println("x and y : ", hex.EncodeToString(x), hex.EncodeToString(y))
    x_big := new(big.Int)
    x_big.SetBytes(x)
    y_big := new(big.Int)
    y_big.SetBytes(y)
    pubkey := ecdsa.PublicKey{Curve: crypto.S256(), X: x_big, Y: y_big}
    address := crypto.PubkeyToAddress(pubkey)
    isOnCurve := crypto.S256().IsOnCurve(pubkey.X, pubkey.Y)
    fmt.Println("Is the point on curve ? ", isOnCurve)
    fmt.Println("address: ", address)
}

产出：

x and y :  8e0473d64b303f9295e1d885bd819e80356379320006ad1af36af84f8d56cfde 0b0c0a45f4e1b266c512a10e7d81a11541aae4e26110190a95f471d0ce53dabd
Is the point on curve ?  true
address:  0x7D6bbc553e34C171Ab13fd0251bd496dCC069a1d