java - 解码 ECDSA 失败，出现 : Exception in thread "main" java. security.SignatureException:错误解码签名字节

Question

我正在尝试使用 java 验证 ECDSA 签名， key 是使用 golang 创建的:

import (
"crypto/ecdsa"
"crypto/elliptic"
"crypto/rand"
"crypto/x509"
"encoding/pem"
"fmt"
"io/ioutil"
"reflect"
)

func doit(){
privateKey, _ := ecdsa.GenerateKey(elliptic.P384(), rand.Reader)
publicKey := &privateKey.PublicKey

if !elliptic.P384().IsOnCurve(publicKey.X, publicKey.Y) {
    fmt.Printf(" public key invalid. ")
}

encPriv, encPub := encode(privateKey, publicKey)

fmt.Println(encPriv)
fmt.Println(encPub)
}

签名发生在这里:(消息由 golang 编码，使用这种方法):

func SignMessage(message []byte) (r *big.Int, s *big.Int, err error) {
zero := big.NewInt(0)
// Hash message:
h := sha1.New()
io.WriteString(h, string(message))
hashBytes := h.Sum(nil)
hash := fmt.Sprintf("%x", hashBytes)

// hash message
// get private key from disk:
pemEncoded, err := ioutil.ReadFile("./ecc/eccpriv.pem")
if err != nil {
    return zero, zero, err
}
pemEncodedPub, err := ioutil.ReadFile("./ecc/eccpub.pem")
if err != nil {
    return zero, zero, err
}

var priv *ecdsa.PrivateKey
//var _pub *ecdsa.PublicKey
priv, _, err = ECCDecodeFromPem(pemEncoded, pemEncodedPub)
if err != nil {
    return zero, zero, err
}

r, s, err = ecdsa.Sign(rand.Reader, priv, []byte(hash))
if err != nil {
    return zero, zero, err
}

return r, s, nil

}

解码方面发生在这里:

        //Verify Response
        String signature = ac.getECCDSAPublicKeyFromServer();
        String cleanSignature = ac.cleanBytes(signature);
        byte[] bSignature = Base64.getDecoder().decode(cleanSignature);

        System.out.println(cleanSignature);
        PublicKey ecdsaPublicKey = ac.getPemPublicKeyFromString(signature,"ECDSA");

        //PublicKey ecdsaPublicKey = ac.getECDSAKeyFromBytes(cleanSignature.getBytes("UTF-8"));

        Signature ecdsaVerify = Signature.getInstance("ECDSA", "BC");
        ecdsaVerify.initVerify(ecdsaPublicKey);
        ecdsaVerify.update(json_response.getBytes("UTF-8"));
        System.out.println("SIG:");
        for(int i=0;i<bSignature.length;i++){
            System.out.println(bSignature[i]);
        }
        System.out.println(new String(bSignature, StandardCharsets.UTF_8));
        System.out.println("/SIG");

        boolean result = ecdsaVerify.verify(bSignature);
        System.out.println("Result is:"+result);

然而，不幸的是，程序失败了，因为:

 Exception in thread "main" java.security.SignatureException: error decoding signature bytes.
 at org.bouncycastle.jcajce.provider.asymmetric.util.DSABase.engineVerify(Unknown Source)
 at java.base/java.security.Signature$Delegate.engineVerify(Signature.java:1245)
 at java.base/java.security.Signature.verify(Signature.java:674)
 at ...

这导致了一个有趣的困境，因为公钥:

-----BEGIN PUBLIC KEY-----
MHYwEAYHKoZIzj0CAQYFK4EEACIDYgAEBiTlkxxYVLduJeiQ7V1AqG4bY9lxrxLX
un+qd4BeaICC1Yx/nsDvvXEPwfCYwXgnyk3u7DV3ldUiaXCIr89OoNei6D2Xgrs3
KYtpVEv7ylnUzo8xZH3/mMdLMUiy6fl8
-----END PUBLIC KEY-----

似乎是正确的，根据这个网站:

https://lapo.it/asn1js/#3076301006072A8648CE3D020106052B81040022036200040624E5931C5854B76E25E890ED5D40A86E1B63D971AF12D7BA7FAA77805E688082D58C7F9EC0EFBD710FC1F098C17827CA4DEEEC357795D522697088AFCF4EA0D7A2E83D9782BB37298B69544BFBCA59D4CE8F31647DFF98C74B3148B2E9F97C

key 生成正确，ASN.1 Parse 对其解码正确。 为什么 java 不喜欢我的代码？

另外，请原谅我糟糕的缩进。

Answer 1

我认为你的问题出在这里:

hash := fmt.Sprintf("%x", hashBytes)

而且你必须将 hashBytes 直接传递给

r, s, err = ecdsa.Sign(rand.Reader, priv, hashBytes)