读取P12格式证书的密钥

不想存储p12证书内容，只想存储证书密钥，可通过以下2種方式实现

一、通過java读取证书的密钥出来：

 package com.zat.ucop.service.util;

 import org.apache.commons.codec.binary.Base64;

 import java.io.FileInputStream;
 import java.io.IOException;
 import java.security.*;
 import java.security.cert.Certificate;
 import java.security.cert.CertificateException;
 import java.util.Enumeration;

 /**
  * 读取P12格式证书的密钥.
  *
  * @author weixiong.cao
  * @date 2019/4/3
  */
 public class ReadP12Demo {

     public static void main(String[] args) throws KeyStoreException, IOException, CertificateException, NoSuchAlgorithmException, UnrecoverableKeyException {
         String keyStorePath = "E:/client_01.p12";
         String password = "123456";

         // 实例化密钥库，默认JKS类型
         KeyStore ks = KeyStore.getInstance("PKCS12");
         // 获得密钥库文件流
         FileInputStream is = new FileInputStream(keyStorePath);
         // 加载密钥库
         ks.load(is, password.toCharArray());
         // 关闭密钥库文件流
         is.close();

         //私钥
         Enumeration aliases = ks.aliases();
         String keyAlias = null;
         if (aliases.hasMoreElements()){
             keyAlias = (String)aliases.nextElement();
             System.out.println("p12's alias----->"+keyAlias);
         }
         PrivateKey privateKey = (PrivateKey) ks.getKey(keyAlias, password.toCharArray());
         String privateKeyStr = Base64.encodeBase64String(privateKey.getEncoded());
         System.out.println("私钥------------->" + privateKeyStr);

         //公钥
         Certificate certificate = ks.getCertificate(keyAlias);
         String publicKeyStr = Base64.encodeBase64String(certificate.getPublicKey().getEncoded());
         System.out.println("公钥------------->"+publicKeyStr);
     }
 }

二、通過openssl命令讀取

進入linux控制臺，輸入以下命令

openssl pkcs12 -in ./client_01.p12 -nocerts -nodes -out ./priKey.prikey

會在指定目錄下生成1個priKey.prikey，我們在提取裏面的內容：