两种方式，实现 SpringBoot 中数据库密码加密

JavaSpringBoot

第一种Jasypt加密

Maven依赖

不同的SpringBoot版本引入的jasypt版本不同
SpringBoot版本号1依赖

<!-- Jasypt加密 -->
<dependency>
    <groupId>com.github.ulisesbocchio</groupId>
    <artifactId>jasypt-spring-boot-starter</artifactId>
    <version>2.0.0</version>
</dependency>

SpringBoot版本号2依赖

<dependency>
    <groupId>com.github.ulisesbocchio</groupId>
    <artifactId>jasypt-spring-boot-starter</artifactId>
    <version>3.0.3</version>
</dependency>

在配置中心增加相关配置

jasypt.encryptor.password=henghe #加密密钥

或者
为了防止salt(盐)泄露，反解出密码。可以在项目部署的时候使用命令传入salt(盐)值:

java -jar xxx.jar -Djasypt.encryptor.password=henghe

将application.yml或配置中心中重要的配置改为加密格式

 password: ENC(tnJpIM6iACWO/wRI//7XsbBqy/Mpx6MG1hXe4S7U4cNWmGhajnUSeXmBmQiniKEU)

SpringBoot程序在启动会自动检测appliction.yml或者配置中心中有ENC(xx)的配置并做解密

加解密的测试类

import org.jasypt.encryption.pbe.PooledPBEStringEncryptor;
import org.jasypt.encryption.pbe.StandardPBEByteEncryptor;
import org.jasypt.encryption.pbe.config.SimpleStringPBEConfig;
/**
 * @Copyright (C), 2018-2018
 * @Descripition : Jasypt安全框架加密类工具包
 */
public class JasyptUtils {
    /**
     * Jasypt生成加密结果
     *
     * @param password 配置文件中设定的加密密码 jasypt.encryptor.password
     * @param value    待加密值
     * @return
     */
    public static String encryptPwd(String password, String value) {
        PooledPBEStringEncryptor encryptOr = new PooledPBEStringEncryptor();
        encryptOr.setConfig(cryptOr(password));
        String result = encryptOr.encrypt(value);
        return result;
    }
    /**
     * 解密
     *
     * @param password 配置文件中设定的加密密码 jasypt.encryptor.password
     * @param value    待解密密文
     * @return
     */
    public static String decyptPwd(String password, String value) {
        PooledPBEStringEncryptor encryptOr = new PooledPBEStringEncryptor();
        encryptOr.setConfig(cryptOr(password));
        String result = encryptOr.decrypt(value);
        return result;
    }
    /**
     * @param password salt
     * @return
     */
    public static SimpleStringPBEConfig cryptOr(String password) {
        SimpleStringPBEConfig config = new SimpleStringPBEConfig();
        config.setPassword(password);
        config.setAlgorithm(StandardPBEByteEncryptor.DEFAULT_ALGORITHM);
        config.setKeyObtentionIterations("1000");
        config.setPoolSize("1");
        config.setProviderName(null);
        config.setSaltGeneratorClassName("org.jasypt.salt.RandomSaltGenerator");
        config.setStringOutputType("base64");
        return config;
    }
    public static void main(String[] args) {
        // 加密
        System.out.println(encryptPwd("EbfYkitulv73I2p0mXI50JMXoaxZTKJ7", "root@1234"));
        // 解密
//        mysql@1234
//        System.out.println(decyptPwd("EbfYkitulv73I2p0mXI50JMXoaxZTKJ7", "bgWQ4OfVCUJ1ExsqNhGV+KKBgpx8alv+"));
//        root@1234
//        System.out.println(decyptPwd("EbfYkitulv73I2p0mXI50JMXoaxZTKJ7", "tdHzge8YvviOJaiV/+P6uQ9wgB44D1aH"));
    }
}

第二种，自定义class

实现EnvironmentPostProcessor

从Spring Boot 1.3开始，可以在应用程序上下文刷新之前使用EnvironmentPostProcessor来自定义应用程序的Environment。Environment表示当前应用程序运行的环境，它可以统一访问各种属性源中的属性，如属性文件、JVM系统属性、系统环境变量和Servlet上下文参数。使用EnvironmentPostProcessor可以在bean初始化之前对Environment进行修改
EnvironmentPostProcessor可以在创建应用程序上下文之前，添加或者修改环境配置。
EnvironmentPostProcessor接口实现代表：ConfigFileApplicationListener

加密解密工具类

package com.yss.henghe.iris.configuration;
/**
 * @Description 
 * @Date 2021/12/1 16:36
 */
import java.util.Base64;
import javax.crypto.Cipher;
import java.security.KeyFactory;
import java.security.interfaces.RSAPrivateKey;
import java.security.interfaces.RSAPublicKey;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;
public class RSAEncryptDecrypt
{
    // 公钥
    private static String publicKey = "MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAqfkYJn8BHttyGrQYcoXTZK8Za" +
            "MVUkqhEdFIyWZhnUQz6Jr299IkBCrbTnKcQTn3ekyQl5/F+j2p8YuNQDBJiq46T/srI+zh1XIaTIKJoOI8M4ploKOztJ8IP" +
            "L9ucdnv/tEdGDD9kY5JILa5DQnem9HkaS55kGJX6Oet6CRiNekwiG4+K61SjyfqxuLcqm7v2gH2nvTnkci9FLwtErpdF4uT" +
            "Mv6LB46Z9Hpg5iVsHDbwnwqOCfirgwdalJQTy+jcn9UqqNTsneREOxTtt9JQEnsDE/4UIPAYiU6cQDRJ5YrXR56LYC/0g55" +
            "KpMVnMIJgS5Y/YVt66QHtUTCVmmSgxAQIDAQAB";
    // 私钥
    private static String privateKey = "MIIEvgIBADANBgkqhkiG9w0BAQEFAASCBKgwggSkAgEAAoIBAQCp+" +
            "RgmfwEe23IatBhyhdNkrxloxVSSqER0UjJZmGdRDPomvb30iQEKttOcpxBOfd6TJCXn8X6Panxi41AMEmKrjpP+" +
            "ysj7OHVchpMgomg4jwzimWgo7O0nwg8v25x2e/+0R0YMP2RjkkgtrkNCd6b0eRpLnmQYlfo563oJGI16TCIbj4rrVKPJ+" +
            "rG4tyqbu/aAfae9OeRyL0UvC0Sul0Xi5My/osHjpn0emDmJWwcNvCfCo4J+" +
            "KuDB1qUlBPL6Nyf1Sqo1Oyd5EQ7FO230lASewMT/hQg8BiJTpxANEnlitdHnotgL/SDnkqkxWcwgmBLlj" +
            "9hW3rpAe1RMJWaZKDEBAgMBAAECggEBAIHEloaVglJ/sf7nLp8IwxrkgB64QVhytUillKFItOBxau53A" +
            "HaYvr3iVW8NMWrruClYeMQ7YKe34d1RtMRyqPhXs2/cfFMoiJmqeNt6gt1jga/i9V4BfRJUm2mrXiorg" +
            "06s97LUFx3aCdcua1Vsqn+NkeDXvY3zuwXLXPFi2GjcRBnwZL9S2i8mxCSChWy8ePjYW34bJ7viTQ7hf" +
            "Hz5VNA0hqMQrmgzUADq5xelnhQKsEWBaHHhLTKGYF0yNmRJ7zQJkiSncxIrzD5dvRH88Ms2nJ7lJlb1F" +
            "YEpZ8URlK63ofOskvcpvXFH3g7yvi6j9rCRFAL/i2UnP+lFimQ+bs0CgYEA7ZdVrSGMsKRwaX7+lmCTu" +
            "5cR6V74ohZKyDyzp8PcOBxvPmjY5tIULK++12xyOpsMHAwAoKfRedRrvS9vm525g5A+fioALXE74/d2A7" +
            "E/psO6hO89W5AcA91wMTZXLLGZ8JD0LBQp3u4dNGyyZLpDMTgM1WUsted1mOn2msRkK68CgYEAtySKlvaL" +
            "8Rw70LMMYZUUJ6BbUsR85aJHZ3JPsisM01PgEgcJiZHfThVZHqUgEU0noqRDzIVVKk9C1Gqx+t6F3JqU8" +
            "Cewop+nIKboLH5vMr+7OqM5hXLSx9g8Mm779k9P4+u7Kvq4/fY38d7kVayr3TVb5g0jEo1ugsHonwMsKk8Cg" +
            "YBa791/EqRCx+2us0jGTdi9qCjW5d7MSzP8SB+LSs/zOg7qGD9MuYO3Rt0Inx1piQathXqIAzOOKdvC4XEaYtgqnv8" +
            "MUw8WVYzSyFiHOURfk/LEBr25WgMfB5Z1f5MGLEP7a7/JTz5ncUQEWMY+/3vQTt+6narrRNgh2wrkWd7tSQKBgGIs" +
            "YWpZUVz3UI0oXbu1iW9Qg4PTtkv2eKZYXaZZc2+ZJ6UiRpeLLZQS14oY5B7CKDwEKB/rXWLnyCBL7YpYXJOL/cjazd" +
            "HvGUzki9LGF9+xbbEaLEx/58OfA23ZlpFLpLy98cAxVJc2tHigje/rNtnGr7ObWTCpxhKr1YHf1n37AoGBAI64k/lV4" +
            "FJn57cJnIZPp1jjapxSouxO063Z5BTYVsA6/cqXgbNPt1S8TnZRaRB2qtVrN5otRuueO6GIRJf6XTXvwxLV4xQAA/Z5" +
            "g2q2gelK7/ChYRdVn6Fwtnwx4iPBkH6FK+eQ0E8BfcJ5f6XPWp8N7ZpaZrd+dyc3r7uW78gG";
    //加密
    public static byte[] encrypt(byte[] str, String publicKey) throws Exception
    {
        // base64编码的公钥
        byte[] decoded = Base64.getDecoder().decode(publicKey);
        RSAPublicKey pubKey = (RSAPublicKey) KeyFactory.getInstance("RSA")
                .generatePublic(new X509EncodedKeySpec(decoded));
        // RSA加密
        Cipher cipher = Cipher.getInstance("RSA");
        cipher.init(Cipher.ENCRYPT_MODE, pubKey);
        return cipher.doFinal(str);
    }
    //解密
    public static byte[] decrypt(byte[] str) throws Exception
    {
        // base64编码的私钥
        byte[] decoded = Base64.getDecoder().decode(privateKey);
        RSAPrivateKey priKey = (RSAPrivateKey) KeyFactory.getInstance("RSA")
                .generatePrivate(new PKCS8EncodedKeySpec(decoded));
        // RSA解密
        Cipher cipher = Cipher.getInstance("RSA");
        cipher.init(Cipher.DECRYPT_MODE, priKey);
        return cipher.doFinal(str);
    }
    public static void main(String[] args) throws Exception
    {
        byte[] message = "1q2w3eROOT!".getBytes();
        System.out.println("原始字符串为:" + new String(message));
        byte[] messageEn = encrypt(message, publicKey);
        String encryPassword = new String(Base64.getEncoder().encode(messageEn));
        System.out.println("加密后的Base64字符串为:" + encryPassword);
        String str = new String(Base64.getEncoder().encode(messageEn));
        byte[] decode = Base64.getDecoder().decode(str);
        byte[] messageDe = RSAEncryptDecrypt.decrypt(decode);
        System.out.println("还原后的字符串为:" + new String(messageDe));
    }
}

创建自定义类，实现EnvironmentPostProcessor

package com.yss.henghe.iris.configuration;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.env.EnvironmentPostProcessor;
import org.springframework.core.env.*;
import java.util.*;
/**
* @Description
* @Date 2021/12/1 14:05
*/
public class SafetyEncryptProcessor implements EnvironmentPostProcessor{
    public static final String SPRING_DATASOURCE_PASSWORD = "spring.datasource.password";
    public static final String PASSWORD_ENABLE_ENCRYPT = "password.enable.encrypt";
    public static final String TRUE = "true";
    @Override
    public void postProcessEnvironment(ConfigurableEnvironment environment, SpringApplication application) {
        String enableEncrypt = environment.getProperty(PASSWORD_ENABLE_ENCRYPT);
        if (TRUE.equals(enableEncrypt)) {
            String password = environment.getProperty(SPRING_DATASOURCE_PASSWORD);
            Properties properties = new Properties();
            byte[] decode = Base64.getDecoder().decode(password);
            byte[] messageDe = new byte[0];
            try {
                messageDe = RSAEncryptDecrypt.decrypt(decode);
            } catch (Exception e) {
            }
            properties.setProperty(SPRING_DATASOURCE_PASSWORD, new String(messageDe));
            PropertiesPropertySource propertiesPropertySource = new PropertiesPropertySource(SPRING_DATASOURCE_PASSWORD,
                                                                                             properties);
            environment.getPropertySources().addFirst(propertiesPropertySource);
        }
    }
}

在META-INF下创建spring.factories，并且引入CustomEnvironmentPostProcessor 类

spring.factories:

org.springframework.boot.env.EnvironmentPostProcessor=\
com.yss.henghe.iris.configuration.SafetyEncryptProcessor

将加密后的密码写入到配置文件中

spring.datasource.password

公钥私钥生成方法，利用datax工具，可以生成1024,2048等制定要求的公钥秘钥

Maven依赖

<dependency> 
    <groupId>com.alibaba.datax</groupId> 
    <artifactId>datax-core</artifactId> 
    <version>0.0.1-SNAPSHOT</version> 
</dependency>

public static void main(String[] args) throws Exception{
    String[] initKey = SecretUtil.initKey(); 
    System.out.printf("%s: %s\n","publicKey",initKey[0]); 
    System.out.printf("%s: %s\n","privateKey",initKey[1]);
}