网上复制了一串代码,但是报错“HexUtil cannot be resolved”,怎么办
package ECDSA;
import javax.crypto.KeyAgreement;
import javax.xml.bind.DatatypeConverter;
import java.security.*;
import java.security.spec.ECGenParameterSpec;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;
/**
* ECCDSA加签验签工具类
* @author Administrator
*
*/
public class Ecdsa {
private static final String SIGNALGORITHMS = "SHA256withECDSA";
private static final String ALGORITHM = "EC";
private static final String SECP256K1 = "secp256k1";
public static void main(String[] args) throws Exception {
// 生成公钥私钥
KeyPair keyPair1 = getKeyPair();
PublicKey publicKey1 = keyPair1.getPublic();
PrivateKey privateKey1 = keyPair1.getPrivate();
//密钥转16进制字符串
String publicKey = HexUtil.encodeHexString(publicKey1.getEncoded());
String privateKey = HexUtil.encodeHexString(privateKey1.getEncoded());
System.out.println("生成公钥:"+publicKey);
System.out.println("生成私钥:"+privateKey);
//16进制字符串转密钥对象
PrivateKey privateKey2 = getPrivateKey(privateKey);
PublicKey publicKey2 = getPublicKey(publicKey);
//加签验签
String data="需要签名的数据";
String signECDSA = signECDSA(privateKey2, data);
boolean verifyECDSA = verifyECDSA(publicKey2, signECDSA, data);
System.out.println("验签结果:"+verifyECDSA);
}
/**
* 加签
* @param privateKey 私钥
* @param data 数据
* @return
*/
public static String signECDSA(PrivateKey privateKey, String data) {
String result = "";
try {
//执行签名
Signature signature = Signature.getInstance(SIGNALGORITHMS);
signature.initSign(privateKey);
signature.update(data.getBytes());
byte[] sign = signature.sign();
return HexUtil.encodeHexString(sign);
} catch (Exception e) {
e.printStackTrace();
}
return result;
}
/**
* 验签
* @param publicKey 公钥
* @param signed 签名
* @param data 数据
* @return
*/
public static boolean verifyECDSA(PublicKey publicKey, String signed, String data) {
try {
//验证签名
Signature signature = Signature.getInstance(SIGNALGORITHMS);
signature.initVerify(publicKey);
signature.update(data.getBytes());
byte[] hex = HexUtil.decode(signed);
boolean bool = signature.verify(hex);
// System.out.println("验证:" + bool);
return bool;
} catch (Exception e) {
e.printStackTrace();
}
return false;
}
/**
* 从string转private key
* @param key 私钥的字符串
* @return
* @throws Exception
*/
public static PrivateKey getPrivateKey(String key) throws Exception {
byte[] bytes = DatatypeConverter.parseHexBinary(key);
PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(bytes);
KeyFactory keyFactory = KeyFactory.getInstance(ALGORITHM);
return keyFactory.generatePrivate(keySpec);
}
/**
* 从string转publicKey
* @param key 公钥的字符串
* @return
* @throws Exception
*/
public static PublicKey getPublicKey(String key) throws Exception {
byte[] bytes = DatatypeConverter.parseHexBinary(key);
X509EncodedKeySpec keySpec = new X509EncodedKeySpec(bytes);
KeyFactory keyFactory = KeyFactory.getInstance(ALGORITHM);
return keyFactory.generatePublic(keySpec);
}
/**
* 生成密钥对
* @return
* @throws Exception
*/
public static KeyPair getKeyPair() throws Exception {
ECGenParameterSpec ecSpec = new ECGenParameterSpec(SECP256K1);
KeyPairGenerator kf = KeyPairGenerator.getInstance(ALGORITHM);
kf.initialize(ecSpec, new SecureRandom());
KeyPair keyPair = kf.generateKeyPair();
return keyPair;
}
}