[网络协议]标题生成JKS密钥库并查看证书 + java加密解密读取公钥私钥cer证书

标题生成JKS密钥库,并查看证书

生成keystore文件

keytool -genkeypair -keysize 2048 -validity 36500 -alias "privateKey" -keyalg "RSA" -keystore "privateKeys.keystore" -storepass "密码" -keypass "密码" -dname "CN=sjjy, OU=sdma, O=sdma, L=jinan, ST=shandong, C=zh_cn"

keytool -importkeystore -srcalias "privateKey" -srckeystore privateKeys.keystore -srcstorepass "密码" -srckeypass "密码" -destkeystore privateKeys.keystore -deststoretype pkcs12 -destkeypass "密码"

keytool -list  -v -keystore privateKeys.keystore

生成cer

keytool -export -alias "privateKey" -keystore privateKeys.keystore -storetype PKCS12 -storepass "密码" -rfc -file "certfile.cer"

生成公钥

keytool -import -alias "publicCert" -file "certfile.cer" -keystore "publicKeys.keystore" -storetype PKCS12  -storepass "密码"

导入证书

keytool -import -alias "publicCert" -file "certfile.cer" -keystore "publicKeys.keystore" -storetype PKCS12  -storepass "密码"

java加解密
部分操作依赖hutool工具(https://www.hutool.cn/docs/#/)

import cn.hutool.core.codec.Base64;
import cn.hutool.core.io.FileUtil;
import cn.hutool.core.io.IoUtil;
import cn.hutool.core.util.CharsetUtil;
import cn.hutool.core.util.StrUtil;
import cn.hutool.crypto.GlobalBouncyCastleProvider;
import cn.hutool.crypto.asymmetric.KeyType;
import cn.hutool.crypto.asymmetric.RSA;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.security.*;
import java.security.cert.Certificate;
import java.security.cert.CertificateException;
import java.security.cert.CertificateFactory;

/**
 * 从私钥文件和公钥文件读取对应的密钥
 *
 * @author <a href="https://github.com/zichen1019">zichen</a>
 */
public class KeyStoreUtils {

    private static final String PKCS12 = "PKCS12";

    private static final String ALIAS = "privateKey";

    private static final char[] PASSWORD = "密码".toCharArray();

    private static final String X_509 = "X.509";

	// 证书、私钥文件存放路径
    private static final String PATH = "C:\\Users\\admin\\.keytool\\";

    /**
     * 从私钥文件中读取私钥
     *
     * @return  私钥
     */
    public static PrivateKey getPrivateKey() {
        KeyStore store;
        InputStream fileInputStream = null;
        try {
            store = KeyStore.getInstance(PKCS12);
            fileInputStream = new FileInputStream(FileUtil.file(PATH + "privateKeys.keystore"));

            // LOADED
            store.load(fileInputStream, PASSWORD);

//            PrivateKey pk = (PrivateKey) store.getKey(ALIAS, PASSWORD);
//            System.err.println("私钥：" + Base64.encode(pk.getEncoded()));

            /*// 从私钥获取公钥
            Certificate ca = store.getCertificate(ALIAS);
            System.err.println("公钥：" + Base64.encode(ca.getPublicKey().getEncoded()));*/

            return (PrivateKey) store.getKey(ALIAS, PASSWORD);

        } catch (KeyStoreException | IOException | NoSuchAlgorithmException | CertificateException | UnrecoverableKeyException e) {
            e.printStackTrace();
            throw new RuntimeException("获取私钥失败！");
        } finally {
            IoUtil.close(fileInputStream);
        }
    }

    /**
     * 从证书文件中读取公钥
     *
     * @return  公钥
     */
    public static PublicKey getPublicKey() {
        InputStream fileInputStream = null;
        try {
            fileInputStream = new FileInputStream(FileUtil.file(PATH + "certfile.cer"));
            CertificateFactory cf = CertificateFactory.getInstance(X_509);
            Certificate c = cf.generateCertificate(fileInputStream);
            System.err.println("证书：" + Base64.encode(c.getEncoded()));
            System.out.println("公钥："+ Base64.encode(c.getPublicKey().getEncoded()));
            return c.getPublicKey();
        } catch (IOException | CertificateException e) {
            e.printStackTrace();
            throw new RuntimeException("获取公钥失败！");
        } finally {
            IoUtil.close(fileInputStream);
        }
    }

    public static void main(String[] args) {
        GlobalBouncyCastleProvider.setUseBouncyCastle(false);
        RSA rsa = new RSA();
        rsa.setPublicKey(getPublicKey());
        String content = "Mm123456@#";
        String ciphertext = StrUtil.str(rsa.encryptBase64(content, KeyType.PublicKey), CharsetUtil.CHARSET_UTF_8);
        System.err.println("密文：" + ciphertext);

        RSA rsa2 = new RSA();
        rsa2.setPrivateKey(getPrivateKey());
        String cc = rsa2.decryptStr(ciphertext, KeyType.PrivateKey);
        System.err.println("解密后：" + cc);
    }

}