java DH密钥交换算法实现类

import javax.crypto.Cipher;
import javax.crypto.KeyAgreement;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.interfaces.DHPrivateKey;
import javax.crypto.interfaces.DHPublicKey;
import javax.crypto.spec.DHParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import java.security.*;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;
import java.util.HashMap;
import java.util.Map;

public class DHUtils {
    /**
     * 非对称加密密钥算法
     */
    private static final String KEY_ALGORITHM = "DH";
    /**
     * 本地密钥算法，即对称加密密钥算法
     * 可选DES、DESede或者AES
     */
    private static final String SELECT_ALGORITHM = "AES";

    /**
     * 默认的加密算法
     */
    private static final String DEFAULT_CIPHER_ALGORITHM = "AES/ECB/PKCS5Padding";


    /**
     * 密钥长度
     */

    private static final int KEY_SIZE = 512;
    //公钥
    private static final String PUBLIC_KEY = "DHPublicKey";
    //私钥
    private static final String PRIVATE_KEY = "DHPrivateKey";

    /**
     * 初始化甲方密钥
     *
     * @return Map 甲方密钥Map
     * @throws Exception
     */
    public static Map<String, Object> initKey() throws Exception {
        //实例化密钥对生成器
        KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance(KEY_ALGORITHM);
        //初始化密钥对生成器
        keyPairGenerator.initialize(KEY_SIZE);
        //生成密钥对
        KeyPair keyPair = keyPairGenerator.generateKeyPair();
        //甲方公钥
        DHPublicKey publicKey = (DHPublicKey) keyPair.getPublic();
        //甲方私钥
        DHPrivateKey privateKey = (DHPrivateKey) keyPair.getPrivate();
        //将密钥对存储在Map中
        Map<String, Object> keyMap = new HashMap<String, Object>(2);
        keyMap.put(PUBLIC_KEY, publicKey);
        keyMap.put(PRIVATE_KEY, privateKey);
        return keyMap;
    }

    /**
     * 初始化乙方密钥
     *
     * @param key 甲方公钥
     * @return Map 乙方密钥Map
     * @throws Exception
     */
    public static Map<String, Object> initKey(byte[] key) throws Exception {
        //解析甲方公钥
        //转换公钥材料
        X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(key);
        //实例化密钥工厂
        KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
        //产生公钥
        PublicKey pubKey = keyFactory.generatePublic(x509KeySpec);
        //由甲方公钥构建乙方密钥
        DHParameterSpec dhParameterSpec = ((DHPublicKey) pubKey).getParams();
        //实例化密钥对生成器
        KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance(KEY_ALGORITHM);
        //初始化密钥对生成器
        keyPairGenerator.initialize(dhParameterSpec);
        //产生密钥对
        KeyPair keyPair = keyPairGenerator.generateKeyPair();
        //乙方公钥
        DHPublicKey publicKey = (DHPublicKey) keyPair.getPublic();
        //乙方私约
        DHPrivateKey privateKey = (DHPrivateKey) keyPair.getPrivate();
        //将密钥对存储在Map中
        Map<String, Object> keyMap = new HashMap<String, Object>(2);
        keyMap.put(PUBLIC_KEY, publicKey);
        keyMap.put(PRIVATE_KEY, privateKey);
        return keyMap;
    }

    /**
     * 生成加密秘钥
     *
     * @return
     */
    private static SecretKeySpec getSecretKey(final byte[] key) {
        //返回生成指定算法密钥生成器的 KeyGenerator 对象
        KeyGenerator kg = null;

        try {
            kg = KeyGenerator.getInstance(SELECT_ALGORITHM);

            //AES 要求密钥长度为 128
            kg.init(128, new SecureRandom(key));

            //生成一个密钥
            SecretKey secretKey = kg.generateKey();

            return new SecretKeySpec(secretKey.getEncoded(), SELECT_ALGORITHM);// 转换为AES专用密钥
        } catch (NoSuchAlgorithmException ex) {
//            Logger.getLogger(AESUtil.class.getName()).log(Level.SEVERE, null, ex);
        }

        return null;
    }

    /**
     * 加密
     *
     * @param data 待加密数据
     * @param key  密钥
     * @return byte[] 加密数据
     * @throws Exception
     */
    public static byte[] encrypt(byte[] data, byte[] key) throws Exception {

        try {
            Cipher cipher = Cipher.getInstance(DEFAULT_CIPHER_ALGORITHM);// 创建密码器

            byte[] byteContent = data;

            cipher.init(Cipher.ENCRYPT_MODE, getSecretKey(key));// 初始化为加密模式的密码器

            byte[] result = cipher.doFinal(byteContent);// 加密
            return result;
//            return org.apache.commons.codec.binary.Base64.encodeBase64String(result);//通过Base64转码返回

        } catch (Exception ex) {
//            Logger.getLogger(AESUtil.class.getName()).log(Level.SEVERE, null, ex);
        }

        return null;


    }

    /**
     * 解密
     *
     * @param data 待解密数据
     * @param key  密钥
     * @return byte[] 解密数据
     * @throws Exception
     */
    public static byte[] decrypt(byte[] data, byte[] key) throws Exception {

        try {
            //实例化
            Cipher cipher = Cipher.getInstance(DEFAULT_CIPHER_ALGORITHM);

            //使用密钥初始化，设置为解密模式
            cipher.init(Cipher.DECRYPT_MODE, getSecretKey(key));

            //执行操作
            byte[] result = cipher.doFinal(data);

            return result;

        } catch (Exception ex) {
//            Logger.getLogger(AESUtil.class.getName()).log(Level.SEVERE, null, ex);
        }

        return null;
    }

    /**
     * 构建密钥
     *
     * @param publicKey  公钥
     * @param privateKey 私钥
     * @return byte[] 本地密钥
     * @throws Exception
     */
    public static byte[] getSecretKey(byte[] publicKey, byte[] privateKey) throws Exception {
        //实例化密钥工厂
        KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
        //初始化公钥
        //密钥材料转换
        X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(publicKey);
        //产生公钥
        PublicKey pubKey = keyFactory.generatePublic(x509KeySpec);
        //初始化私钥
        //密钥材料转换
        PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(privateKey);
        //产生私钥
        PrivateKey priKey = keyFactory.generatePrivate(pkcs8KeySpec);
        //实例化
        KeyAgreement keyAgree = KeyAgreement.getInstance(keyFactory.getAlgorithm());
        //初始化
        keyAgree.init(priKey);
        keyAgree.doPhase(pubKey, true);
        //生成本地密钥
        SecretKey secretKey = keyAgree.generateSecret(SELECT_ALGORITHM);
        return secretKey.getEncoded();
    }

    /**
     * 取得私钥
     *
     * @param keyMap 密钥Map
     * @return byte[] 私钥
     * @throws Exception
     */
    public static byte[] getPrivateKey(Map<String, Object> keyMap) throws Exception {
        Key key = (Key) keyMap.get(PRIVATE_KEY);
        return key.getEncoded();
    }

    /**
     * 取得公钥
     *
     * @param keyMap 密钥Map
     * @return byte[] 公钥
     * @throws Exception
     */
    public static byte[] getPublicKey(Map<String, Object> keyMap) throws Exception {
        Key key = (Key) keyMap.get(PUBLIC_KEY);
        return key.getEncoded();
    }


    /**
     * 主方法
     *
     * @param args
     * @throws Exception
     */
    public static void main(String[] args) throws Exception {
        //甲方公钥
        byte[] publicKeyA;
        //甲方私钥
        byte[] privateKeyA;
        //甲方本地密钥
        byte[] localKeyA;
        //乙方公钥
        byte[] publicKeyB;
        //乙方私钥
        byte[] privateKeyB;
        //乙方本地密钥
        byte[] localKeyB;

        //初始化密钥
        //生成甲方密钥对
        Map<String, Object> keyMapA = DHUtils.initKey();
        publicKeyA = DHUtils.getPublicKey(keyMapA);
        privateKeyA = DHUtils.getPrivateKey(keyMapA);
        System.out.println("甲方公钥:
" + org.apache.commons.codec.binary.Base64.encodeBase64String(publicKeyA));
        System.out.println("甲方私钥:
" + org.apache.commons.codec.binary.Base64.encodeBase64String(privateKeyA));
        //由甲方公钥产生乙方本地密钥对
        Map<String, Object> keyMapB = DHUtils.initKey(publicKeyA);
        publicKeyB = DHUtils.getPublicKey(keyMapB);
        privateKeyB = DHUtils.getPrivateKey(keyMapB);
        System.out.println("乙方公钥:
" + org.apache.commons.codec.binary.Base64.encodeBase64String(publicKeyB));
        System.out.println("乙方私钥:
" + org.apache.commons.codec.binary.Base64.encodeBase64String(privateKeyB));
        localKeyA = DHUtils.getSecretKey(publicKeyB, privateKeyA);
        System.out.println("甲方本地密钥:
" + org.apache.commons.codec.binary.Base64.encodeBase64String(localKeyA));
        localKeyB = DHUtils.getSecretKey(publicKeyA, privateKeyB);
        System.out.println("乙方本地密钥:
" + org.apache.commons.codec.binary.Base64.encodeBase64String(localKeyB));

        System.out.println();
        System.out.println("===甲方向乙方发送加密数据===");
        String msgA2B = "求知若饥，虚心若愚。";
        System.out.println("原文:
" + msgA2B);
        System.out.println("---使用甲方本地密钥对数据进行加密---");
        //使用甲方本地密钥对数据加密
        byte[] encodeMsgA2B = DHUtils.encrypt(msgA2B.getBytes(), localKeyA);
        System.out.println("加密:
" + org.apache.commons.codec.binary.Base64.encodeBase64String(encodeMsgA2B));
        System.out.println("---使用乙方本地密钥对数据库进行解密---");
        //使用乙方本地密钥对数据进行解密
        byte[] msgB2A = DHUtils.decrypt(encodeMsgA2B, localKeyB);
        String output1 = new String(msgB2A);
        System.out.println("解密:
" + output1);

        System.out.println("/~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~..~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~/");
        System.out.println("===乙方向甲方发送加密数据===");
        String input2 = "好好学习，天天向上。";
        System.out.println("原文:
" + input2);
        System.out.println("---使用乙方本地密钥对数据进行加密---");
        //使用乙方本地密钥对数据进行加密
        byte[] encode2 = DHUtils.encrypt(input2.getBytes(), localKeyB);
        System.out.println("加密:
" + org.apache.commons.codec.binary.Base64.encodeBase64String(encode2));
        System.out.println("---使用甲方本地密钥对数据进行解密---");
        //使用甲方本地密钥对数据进行解密
        byte[] decode2 = DHUtils.decrypt(encode2, localKeyA);
        String output2 = new String(decode2);
        System.out.println("解密:
" + output2);
    }

}

　　输出结果

"C:Program FilesJavajdk1.8.0_91injava.exe" "-javaagent:C:Program FilesJetBrainsIntelliJ IDEA 2019.3.3libidea_rt.jar=56888:C:Program FilesJetBrainsIntelliJ IDEA 2019.3.3in" -Dfile.encoding=UTF-8 -classpath "C:Program FilesJavajdk1.8.0_91jrelibcharsets.jar;C:Program FilesJavajdk1.8.0_91jrelibdeploy.jar;C:Program FilesJavajdk1.8.0_91jrelibextaccess-bridge-64.jar;C:Program FilesJavajdk1.8.0_91jrelibextcldrdata.jar;C:Program FilesJavajdk1.8.0_91jrelibextdnsns.jar;C:Program FilesJavajdk1.8.0_91jrelibextjaccess.jar;C:Program FilesJavajdk1.8.0_91jrelibextjfxrt.jar;C:Program FilesJavajdk1.8.0_91jrelibextlocaledata.jar;C:Program FilesJavajdk1.8.0_91jrelibext
ashorn.jar;C:Program FilesJavajdk1.8.0_91jrelibextsunec.jar;C:Program FilesJavajdk1.8.0_91jrelibextsunjce_provider.jar;C:Program FilesJavajdk1.8.0_91jrelibextsunmscapi.jar;C:Program FilesJavajdk1.8.0_91jrelibextsunpkcs11.jar;C:Program FilesJavajdk1.8.0_91jrelibextzipfs.jar;C:Program FilesJavajdk1.8.0_91jrelibjavaws.jar;C:Program FilesJavajdk1.8.0_91jrelibjce.jar;C:Program FilesJavajdk1.8.0_91jrelibjfr.jar;C:Program FilesJavajdk1.8.0_91jrelibjfxswt.jar;C:Program FilesJavajdk1.8.0_91jrelibjsse.jar;C:Program FilesJavajdk1.8.0_91jrelibmanagement-agent.jar;C:Program FilesJavajdk1.8.0_91jrelibplugin.jar;C:Program FilesJavajdk1.8.0_91jrelib
esources.jar;C:Program FilesJavajdk1.8.0_91jrelib
t.jar;Z:workspaceim	arget	est-classes;Z:.m2
epositoryorgapachecommonscommons-lang33.9commons-lang3-3.9.jar;Z:.m2
epositorycommons-codeccommons-codec1.14commons-codec-1.14.jar;Z:.m2
epositorycnhutoolhutool-all5.1.4hutool-all-5.1.4.jar;Z:.m2
epositoryorgouncycastlecprov-jdk15on1.52cprov-jdk15on-1.52.jar" DHUtils
甲方公钥:
MIHgMIGXBgkqhkiG9w0BAwEwgYkCQQD8poLOjhLKuibvzPcRDlJtsHiwXt7LzR60ogjzrhYXrgHzW5Gkfm32NBPF4S7QiZvNEyrNUNmRUb3EPuc3WS4XAkBnhHGyepz0TukaScUUfbGpqvJE8FpDTWSGkx0tFCcbnjUDC3H9c9oXkGmzLik1Yw4cIGI1TQ2iCmxBblC+eUykAgIBgANEAAJBANKee3tUIVRpwpLj+Kfqe5t8w4QIM54k94fKcp2Alg/kWLm4bEBTvWv4XMKIH13k9eQcvTRxVuqxdkS62yi1guc=
甲方私钥:
MIHSAgEAMIGXBgkqhkiG9w0BAwEwgYkCQQD8poLOjhLKuibvzPcRDlJtsHiwXt7LzR60ogjzrhYXrgHzW5Gkfm32NBPF4S7QiZvNEyrNUNmRUb3EPuc3WS4XAkBnhHGyepz0TukaScUUfbGpqvJE8FpDTWSGkx0tFCcbnjUDC3H9c9oXkGmzLik1Yw4cIGI1TQ2iCmxBblC+eUykAgIBgAQzAjEA/cVM7DmzLK7gijP61uR2ipNjP/tG84kCZJzt10KM8XPpvvKGDa6c000GO3dNliIC
乙方公钥:
MIHgMIGXBgkqhkiG9w0BAwEwgYkCQQD8poLOjhLKuibvzPcRDlJtsHiwXt7LzR60ogjzrhYXrgHzW5Gkfm32NBPF4S7QiZvNEyrNUNmRUb3EPuc3WS4XAkBnhHGyepz0TukaScUUfbGpqvJE8FpDTWSGkx0tFCcbnjUDC3H9c9oXkGmzLik1Yw4cIGI1TQ2iCmxBblC+eUykAgIBgANEAAJBAJIS3ho3UENwFuQwrB3uPXS0q9K+0Box8fdGeCdj10uyT0vSV+TgoO6IhX11k535QfBMvh8cHR4BrYo7LSC/wdY=
乙方私钥:
MIHSAgEAMIGXBgkqhkiG9w0BAwEwgYkCQQD8poLOjhLKuibvzPcRDlJtsHiwXt7LzR60ogjzrhYXrgHzW5Gkfm32NBPF4S7QiZvNEyrNUNmRUb3EPuc3WS4XAkBnhHGyepz0TukaScUUfbGpqvJE8FpDTWSGkx0tFCcbnjUDC3H9c9oXkGmzLik1Yw4cIGI1TQ2iCmxBblC+eUykAgIBgAQzAjEAyMLT94TotoWZCPvaJpT3VYlQ3TgwJvo7Mc/gsbdTBIQKQRIRhEZ1MCpn8is83CKh
甲方本地密钥:
SZb1nFDuDT34Q9WkIb7bNVndlSOfHa0s55ZbxuldNhQ=
乙方本地密钥:
SZb1nFDuDT34Q9WkIb7bNVndlSOfHa0s55ZbxuldNhQ=

===甲方向乙方发送加密数据===
原文:
求知若饥，虚心若愚。
---使用甲方本地密钥对数据进行加密---
加密:
5cORf8g/pkzIvSPd7sNn0yWkOjx0JQvzwYaKR0/ox2c=
---使用乙方本地密钥对数据库进行解密---
解密:
求知若饥，虚心若愚。
/~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~..~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~/
===乙方向甲方发送加密数据===
原文:
好好学习，天天向上。
---使用乙方本地密钥对数据进行加密---
加密:
Mh08mY3CwWCJowGf8t/ZPaNJUxJpcAifHepADby3kTs=
---使用甲方本地密钥对数据进行解密---
解密:
好好学习，天天向上。

Process finished with exit code 0