package com.storlead.framework.common.util;

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

import javax.crypto.Cipher;
import java.security.KeyFactory;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.NoSuchAlgorithmException;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.interfaces.RSAPrivateKey;
import java.security.interfaces.RSAPublicKey;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;

/**
 * @from fhadmin.cn
 * @description Rsa 工具类，公钥私钥生成，加解密
 * @date 2020-05-18
 **/
public class RsaUtils {


//    public static final String PUBLIC_KEY = "RSAPublicKey";
//
//    public static final String PRIVATE_KEY = "RSAPrivateKey";

    private static final String SRC = "123456";
    /**
     * 公钥
     */
    public static final String PUBLIC_KEY = "MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCOlrKBglhJkU/bfgEEv7zuo4y5RiScg3XeDTBrHHePoixDOvyvBsiAc8b33bjin9j77EzRusJT2jjJV1hnHIbu5HkMd3T5JK00gMviCiSbfCkS4/tf3CnFMWLn31YcBgdCOFoiKh/JpGEvTx192LWSKNupDkR6bgpcRvWr5Yw2swIDAQAB";
    /**
     * 私钥  私钥不需要在特殊处理在java中直接调用即可
     */
    public static final String PRIVATE_KEY = "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";

    public static void main(String[] args) throws Exception {
        System.out.println("\n");
        RsaKeyPair keyPair = generateKeyPair();
        System.out.println("公钥：" + keyPair.getPublicKey());
        System.out.println("私钥：" + keyPair.getPrivateKey());
        System.out.println("\n");
        test1(keyPair);
        System.out.println("\n");
        test2(keyPair);
        System.out.println("\n");
    }

    /**
     * 公钥加密私钥解密
     */
    private static void test1(RsaKeyPair keyPair) throws Exception {
        System.out.println("***************** 公钥加密私钥解密开始 *****************");
//        String text1 = encryptByPublicKey(keyPair.getPublicKey(), RsaUtils.SRC);
//        String text2 = decryptByPrivateKey(keyPair.getPrivateKey(), text1);
        String text1 = encryptByPublicKey(RsaUtils.PUBLIC_KEY, RsaUtils.SRC);
        String text2 = decryptByPrivateKey(RsaUtils.PRIVATE_KEY, text1);
        System.out.println("加密前：" + RsaUtils.SRC);
        System.out.println("加密后：" + text1);
        System.out.println("解密后：" + text2);
        if (RsaUtils.SRC.equals(text2)) {
            System.out.println("解密字符串和原始字符串一致，解密成功");
        } else {
            System.out.println("解密字符串和原始字符串不一致，解密失败");
        }
        System.out.println("***************** 公钥加密私钥解密结束 *****************");
    }

    /**
     * 私钥加密公钥解密
     * @throws Exception /
     */
    private static void test2(RsaKeyPair keyPair) throws Exception {
        System.out.println("***************** 私钥加密公钥解密开始 *****************");
        String text1 = encryptByPrivateKey(keyPair.getPrivateKey(), RsaUtils.SRC);
        String text2 = decryptByPublicKey(keyPair.getPublicKey(), text1);
        System.out.println("加密前：" + RsaUtils.SRC);
        System.out.println("加密后：" + text1);
        System.out.println("解密后：" + text2);
        if (RsaUtils.SRC.equals(text2)) {
            System.out.println("解密字符串和原始字符串一致，解密成功");
        } else {
            System.out.println("解密字符串和原始字符串不一致，解密失败");
        }
        System.out.println("***************** 私钥加密公钥解密结束 *****************");
    }

    /**
     * 公钥解密
     * @from fhadmin.cn
     * @param publicKeyText 公钥
     * @param text 待解密的信息
     * @return /
     * @throws Exception /
     */
    public static String decryptByPublicKey(String publicKeyText, String text) throws Exception {
        X509EncodedKeySpec x509EncodedKeySpec = new X509EncodedKeySpec(Base64.decodeBase64(publicKeyText));
        KeyFactory keyFactory = KeyFactory.getInstance("RSA");
        PublicKey publicKey = keyFactory.generatePublic(x509EncodedKeySpec);
        Cipher cipher = Cipher.getInstance("RSA");
        cipher.init(Cipher.DECRYPT_MODE, publicKey);
        byte[] result = cipher.doFinal(Base64.decodeBase64(text));
        return new String(result);
    }

    /**
     * 私钥加密
     * @from fhadmin.cn
     * @param privateKeyText 私钥
     * @param text 待加密的信息
     * @return /
     * @throws Exception /
     */
    public static String encryptByPrivateKey(String privateKeyText, String text) throws Exception {
        PKCS8EncodedKeySpec pkcs8EncodedKeySpec = new PKCS8EncodedKeySpec(Base64.decodeBase64(privateKeyText));
        KeyFactory keyFactory = KeyFactory.getInstance("RSA");
        PrivateKey privateKey = keyFactory.generatePrivate(pkcs8EncodedKeySpec);
        Cipher cipher = Cipher.getInstance("RSA");
        cipher.init(Cipher.ENCRYPT_MODE, privateKey);
        byte[] result = cipher.doFinal(text.getBytes());
        return Base64.encodeBase64String(result);
    }

    /**
     * 私钥解密
     * @from fhadmin.cn
     * @param privateKeyText 私钥
     * @param text 待解密的文本
     * @return /
     * @throws Exception /
     */
    public static String decryptByPrivateKey(String privateKeyText, String text) throws Exception {
        PKCS8EncodedKeySpec pkcs8EncodedKeySpec5 = new PKCS8EncodedKeySpec(Base64.decodeBase64(privateKeyText));
        KeyFactory keyFactory = KeyFactory.getInstance("RSA");
        PrivateKey privateKey = keyFactory.generatePrivate(pkcs8EncodedKeySpec5);
        Cipher cipher = Cipher.getInstance("RSA");
        cipher.init(Cipher.DECRYPT_MODE, privateKey);
        byte[] result = cipher.doFinal(Base64.decodeBase64(text));
        return new String(result);
    }

    /**
     * 公钥加密
     * @from fhadmin.cn
     * @param publicKeyText 公钥
     * @param text 待加密的文本
     * @return /
     */
    public static String encryptByPublicKey(String publicKeyText, String text) throws Exception {
        X509EncodedKeySpec x509EncodedKeySpec2 = new X509EncodedKeySpec(Base64.decodeBase64(publicKeyText));
        KeyFactory keyFactory = KeyFactory.getInstance("RSA");
        PublicKey publicKey = keyFactory.generatePublic(x509EncodedKeySpec2);
        Cipher cipher = Cipher.getInstance("RSA");
        cipher.init(Cipher.ENCRYPT_MODE, publicKey);
        byte[] result = cipher.doFinal(text.getBytes());
        return Base64.encodeBase64String(result);
    }

    /**
     * 构建RSA密钥对
     * @from fhadmin.cn
     * @return /
     * @throws NoSuchAlgorithmException /
     */
    public static RsaKeyPair generateKeyPair() throws NoSuchAlgorithmException {
        KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance("RSA");
        keyPairGenerator.initialize(1024);
        KeyPair keyPair = keyPairGenerator.generateKeyPair();
        RSAPublicKey rsaPublicKey = (RSAPublicKey) keyPair.getPublic();
        RSAPrivateKey rsaPrivateKey = (RSAPrivateKey) keyPair.getPrivate();
        String publicKeyString = Base64.encodeBase64String(rsaPublicKey.getEncoded());
        String privateKeyString = Base64.encodeBase64String(rsaPrivateKey.getEncoded());
        RsaKeyPair pair = new RsaKeyPair(publicKeyString, privateKeyString);
        return pair;
    }


    /**
     * RSA密钥对对象
     */
    public static class RsaKeyPair {

        private final String publicKey;
        private final String privateKey;

        public RsaKeyPair(String publicKey, String privateKey) {
            this.publicKey = publicKey;
            this.privateKey = privateKey;
        }

        public String getPublicKey() {
            return publicKey;
        }

        public String getPrivateKey() {
            return privateKey;
        }

    }
}
