微信支付AES解密工具类

深藏阁楼爱情的钟 2022-05-09 04:34 360阅读 0赞

## WechatAESUtil类 ##

public class WechatAESUtil {
    
    /**
    
    * 密钥算法
    
    */
    
    private static final String ALGORITHM = "AES";
    
    /**
    
    * 加解密算法/工作模式/填充方式
    
    */
    
    private static final String ALGORITHM_MODE_PADDING = "AES/ECB/PKCS7Padding";
    
    /**
    
    * 生成key
    
    */
    
    private static final String key = PropertyUtil.getProperty("paykey");//此处为测试key，正式环境请替换成商户密钥
    
    private static final SecretKeySpec secretKey = new SecretKeySpec(Md5Util.MD5Encode(key, "UTF-8").toLowerCase().getBytes(), ALGORITHM);
    
    @SuppressWarnings("unchecked")
    
    public static void fixKeyLength()throws Exception {
    
    String errorString = "Failed manually overriding key-length permissions.";
    
    int newMaxKeyLength;
    
    try {
    
    if ((newMaxKeyLength = Cipher.getMaxAllowedKeyLength("AES")) < 256) {
    
    Class<?> c = Class.forName("javax.crypto.CryptoAllPermissionCollection");
    
    Constructor<?> con = c.getDeclaredConstructor();
    
    con.setAccessible(true);
    
    Object allPermissionCollection = con.newInstance();
    
    Field f = c.getDeclaredField("all_allowed");
    
    f.setAccessible(true);
    
    f.setBoolean(allPermissionCollection, true);
    
    
    
    c = Class.forName("javax.crypto.CryptoPermissions");
    
    con = c.getDeclaredConstructor();
    
    con.setAccessible(true);
    
    Object allPermissions = con.newInstance();
    
    f = c.getDeclaredField("perms");
    
    f.setAccessible(true);
    
    ((Map<String, Object>) f.get(allPermissions)).put("*", allPermissionCollection);
    
    
    
    c = Class.forName("javax.crypto.JceSecurityManager");
    
    f = c.getDeclaredField("defaultPolicy");
    
    f.setAccessible(true);
    
    Field mf = Field.class.getDeclaredField("modifiers");
    
    mf.setAccessible(true);
    
    mf.setInt(f, f.getModifiers() & ~Modifier.FINAL);
    
    f.set(null, allPermissions);
    
    
    
    newMaxKeyLength = Cipher.getMaxAllowedKeyLength("AES");
    
    }
    
    } catch (Exception e) {
    
    throw new RuntimeException(errorString, e);
    
    }
    
    if (newMaxKeyLength < 256)
    
    throw new RuntimeException(errorString); // hack failed
    
    }
    
    /**
    
    * AES加密
    
    *
    
    * @param data
    
    * @return
    
    * @throws Exception
    
    */
    
    public static String encryptData(String data) throws Exception {
    
    try {
    
    // 创建密码器
    
    Cipher cipher = Cipher.getInstance(ALGORITHM_MODE_PADDING);
    
    // 初始化
    
    cipher.init(Cipher.ENCRYPT_MODE, secretKey);
    
    return Base64Util.encode(cipher.doFinal(data.getBytes()));
    
    } catch (Exception e) {
    
    e.printStackTrace();
    
    }
    
    return null;
    
    }
    
    /**
    
    * AES解密
    
    *
    
    * @param base64Data
    
    * @return
    
    * @throws Exception
    
    */
    
    public static String decryptData(String base64Data) throws Exception {
    
    try {
    
    fixKeyLength();
    
    //添加一个安全管理器提供者
    
    Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());
    
    //根据一个字节数组构造一个 SecretKey
    
    /*SecretKeySpec key = new SecretKeySpec(keyBytes, "AES"); */
    
    // 创建密码器
    
    Cipher cipher = Cipher.getInstance(ALGORITHM_MODE_PADDING);
    
    // 初始化
    
    cipher.init(Cipher.DECRYPT_MODE, secretKey);
    
    return new String(cipher.doFinal(Base64Util.decode(base64Data)));
    
    } catch (Exception e) {
    
    e.printStackTrace();
    
    }
    
    return null;
    
    }
    
    public static void main(String[] args) throws Exception {
    
    System.out.println("paykey"+PropertyUtil.getProperty("paykey"));
    
    //String A 为测试字符串，是微信返回过来的退款通知字符串
    
    String A = "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";
    
    String B = WechatAESUtil.decryptData(A);
    
    System.out.println("rwerwqe"+B);
    
    }
    
    }

## AES依赖加密包 ##

<dependency>
    
    <groupId>org.bouncycastle.bcprov-jdk15on.1.57.org.bouncycastle</groupId>
    
    <artifactId>bcprov-jdk15on</artifactId>
    
    <version>1.57</version>
    
    </dependency>
    
    <dependency>
    
    <groupId>org.bouncycastle.bcpkix-jdk15on.1.57.org.bouncycastle</groupId>
    
    <artifactId>bcpkix-jdk15on</artifactId>
    
    <version>1.57</version>
    
    </dependency>
    
    </dependencies>

## PropertyUtil.java类 ##

package cn.web.front.common;
    
    import org.slf4j.Logger;
    import org.slf4j.LoggerFactory;
    
    import java.io.*;
    import java.util.Properties;
    
    /**
     * @ClassName: PropertyUtil 
     * @Description: TODO(配置文件获取工具类) 
     *
     */
    public class PropertyUtil {
        private static final Logger logger = LoggerFactory.getLogger(PropertyUtil.class);
        private static Properties props;
        static{
            loadProps();
        }
    
        synchronized static private void loadProps(){
            logger.info("开始加载properties文件内容.......");
            props = new Properties();
            InputStream in = null;
            try {
                in = PropertyUtil.class.getClassLoader().getResourceAsStream("config.properties");;
                props.load(in);
            } catch (FileNotFoundException e) {
                logger.error("config.properties文件未找到");
            } catch (IOException e) {
                logger.error("出现IOException");
            } finally {
                try {
                    if(null != in) {
                        in.close();
                    }
                } catch (IOException e) {
                    logger.error("config.properties文件流关闭出现异常");
                }
            }
            logger.info("加载properties文件内容完成...........");
            logger.info("properties文件内容：" + props);
        }
    
        public static String getProperty(String key){
            if(null == props) {
                loadProps();
            }
            return props.getProperty(key);
        }
    
        public static String getProperty(String key, String defaultValue) {
            if(null == props) {
                loadProps();
            }
            return props.getProperty(key, defaultValue);
        }
        
        public static void main(String[] args) {
            System.out.println(PropertyUtil.getProperty("cos.appId"));
            System.out.println(PropertyUtil.getProperty("cos.secretId"));
            System.out.println(PropertyUtil.getProperty("cos.secretKey"));
            System.out.println(PropertyUtil.getProperty("cos.bucketName"));
            
    //        System.out.println(PropertyUtil.getProperty("qq.clientId"));
    //        System.out.println(PropertyUtil.getProperty("qq.clientSecret"));
            
        }
    }