当我执行代码时，仅生成公钥而不生成私钥，那该怎么办？

Question

package com.project;
import java.security.*;
import java.security.spec.*;

public class ECCKeyGeneration {
  public static void main(String[] args) throws Exception {
    KeyPairGenerator kpg;
    kpg = KeyPairGenerator.getInstance("EC","SunEC");
    ECGenParameterSpec ecsp;
    ecsp = new ECGenParameterSpec("secp192r1");
    kpg.initialize(ecsp);

    KeyPair kp = kpg.genKeyPair();
    PrivateKey privKey = kp.getPrivate();
    PublicKey pubKey = kp.getPublic();

    System.out.println(privKey.toString());
    System.out.println(pubKey.toString());
  }
}

[2] This is the code for elliptic curve cryptography for public and private key generation but when I executed this code ,showing only the public key but not the private key,so please help me out and let me know ,what to do to generate the private key!!

Answer 1

import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.spec.ECGenParameterSpec;

public class ECCKeyGeneration {

    public static void main(String[] args)  {
        try {
            KeyPairGenerator kpg;
            kpg = KeyPairGenerator.getInstance("EC","SunEC");
            ECGenParameterSpec ecsp;
            ecsp = new ECGenParameterSpec("secp192r1");
            kpg.initialize(ecsp);

            KeyPair kp = kpg.genKeyPair();
            PrivateKey privKey = kp.getPrivate();
            PublicKey pubKey = kp.getPublic();

            System.out.println(privKey.toString());
            System.out.println(pubKey.toString());
        } catch (Exception ex) {
            System.out.println(ex);
        }
    }
}

I've just tested the above code.

Output

Sun EC private key, 192 bits private value: 3248833611418544793834748156439256292267803494576663573112
parameters: secp192r1 [NIST P-192, X9.62 prime192v1] (1.2.840.10045.3.1.1) Sun EC public key, 192 bits public x coord: 5122655651118956061783347731888893733494103991283417332818 public y coord: 223043343028867724454216740788693823451155477884918709166
parameters: secp192r1 [NIST P-192, X9.62 prime192v1] (1.2.840.10045.3.1.1)

Are you getting the same output?