Question

我正在尝试使用java验证ECDSA签名，该密钥是使用golang创建的：

preferredDisplayMode = .primaryOverlay

签名发生在这里：（消息是使用此方法由golang编码的）：

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)
}

解码方面正在发生：

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

}

但是，不幸的是，该程序失败是因为：

        //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);

由于公共密钥，这会引起一个有趣的困境：

 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 ...

根据此网站，看来是正确的：

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

密钥已正确生成，并且ASN.1 Parse对其进行了正确解码。为什么Java不喜欢我的代码？

另外，请原谅我的缩进。

Answer 1

我认为您的问题在这里：

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

而且您必须直接将hashBytes传递给

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

解码ECDSA失败，并带有：线程“主”中的异常java.security.SignatureException：解码签名字节时出错

1 个答案: