微信小程序用户信息AES-128-CBC Java 解密

r囧r小猫 2022-05-16 06:57 186阅读 0赞

## 欢迎转载：[攻城狮不是猫][Link 1] 求保留连接 ##

import com.alibaba.fastjson.JSON;
    import org.apache.commons.codec.binary.Base64;
    import org.bouncycastle.jce.provider.BouncyCastleProvider;
    import javax.crypto.BadPaddingException;
    import javax.crypto.Cipher;
    import javax.crypto.IllegalBlockSizeException;
    import javax.crypto.NoSuchPaddingException;
    import javax.crypto.spec.IvParameterSpec;
    import javax.crypto.spec.SecretKeySpec;
    import java.security.*;
    import java.util.HashMap;
    import java.util.Map;
    
    /**AES 是一种可逆加密算法，对用户的敏感信息加密处理
     * 对原始数据进行AES加密后，在进行Base64编码转化；
     */
    public class AesCBC {
        public static boolean initialized = false;
    
        /**
         * AES解密
         * @param content 密文
         * @return
         * @throws InvalidAlgorithmParameterException
         * @throws NoSuchProviderException
         */
        public static byte[] decrypt(byte[] content, byte[] keyByte, byte[] ivByte) throws InvalidAlgorithmParameterException {
            initialize();
            try {
                Cipher cipher = Cipher.getInstance("AES/CBC/PKCS7Padding");
                Key sKeySpec = new SecretKeySpec(keyByte, "AES");
    
                cipher.init(Cipher.DECRYPT_MODE, sKeySpec, generateIV(ivByte));// 初始化
                byte[] result = cipher.doFinal(content);
                return result;
            } catch (NoSuchAlgorithmException e) {
                e.printStackTrace();
            } catch (NoSuchPaddingException e) {
                e.printStackTrace();
            } catch (InvalidKeyException e) {
                e.printStackTrace();
            } catch (IllegalBlockSizeException e) {
                e.printStackTrace();
            } catch (BadPaddingException e) {
                e.printStackTrace();
            } catch (NoSuchProviderException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            } catch (Exception e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
            return null;
        }
    
        /**
         * 微信小程序用户信息解密
         * @param encryptedData
         * @param sessionKey
         * @param iv
         * @return
         */
        public static String decrypt(String encryptedData, String sessionKey, String iv){
            try {
                byte[] resultByte = decrypt(Base64.decodeBase64(encryptedData), Base64.decodeBase64(sessionKey), Base64.decodeBase64(iv));
                if(null != resultByte && resultByte.length > 0){
                    String info = new String(resultByte, "UTF-8");
                    return info;
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
            return null;
        }
    
        public static void initialize(){
            if (initialized) return;
            Security.addProvider(new BouncyCastleProvider());
            initialized = true;
        }
        //生成iv
        public static AlgorithmParameters generateIV(byte[] iv) throws Exception{
            AlgorithmParameters params = AlgorithmParameters.getInstance("AES");
            params.init(new IvParameterSpec(iv));
            return params;
        }
    
        public static void main(String[] args) {
            String encryptedData, sessionKey, iv, appId;
            encryptedData = "CiyLU1Aw2KjvrjMdj8YKliAjtP4gsMZM"+
                    "QmRzooG2xrDcvSnxIMXFufNstNGTyaGS"+
                    "9uT5geRa0W4oTOb1WT7fJlAC+oNPdbB+"+
                    "3hVbJSRgv+4lGOETKUQz6OYStslQ142d"+
                    "NCuabNPGBzlooOmB231qMM85d2/fV6Ch"+
                    "evvXvQP8Hkue1poOFtnEtpyxVLW1zAo6"+
                    "/1Xx1COxFvrc2d7UL/lmHInNlxuacJXw"+
                    "u0fjpXfz/YqYzBIBzD6WUfTIF9GRHpOn"+
                    "/Hz7saL8xz+W//FRAUid1OksQaQx4CMs"+
                    "8LOddcQhULW4ucetDf96JcR3g0gfRK4P"+
                    "C7E/r7Z6xNrXd2UIeorGj5Ef7b1pJAYB"+
                    "6Y5anaHqZ9J6nKEBvB4DnNLIVWSgARns"+
                    "/8wR2SiRS7MNACwTyrGvt9ts8p12PKFd"+
                    "lqYTopNHR1Vf7XjfhQlVsAJdNiKdYmYV"+
                    "oKlaRv85IfVunYzO0IKXsyl7JCUjCpoG"+
                    "20f0a04COwfneQAGGwd5oa+T8yO5hzuy"+
                    "Db/XcxxmK01EpqOyuxINew==";
            sessionKey = "tiihtNczf5v6AKRyjwEUhQ==";
            iv = "r7BXXKkLb8qrSNn05n0qiA==";
            appId = "wx4f4bc4dec97d474b";
            String info = decrypt(encryptedData, sessionKey, iv);
            System.out.println(info);
            Map<String, Object> map = new HashMap<>();
            map.put("encryptedData", encryptedData);
            map.put("sessionKey", sessionKey);
            map.put("iv", iv);
            map.put("appId", appId);
            Map<String, Object> map1 = new HashMap<>();
            map1.put("wxapplet", map);
            String wxapplet =  JSON.toJSON(map1).toString();
            System.out.println(wxapplet);
    
        }
    }

[Link 1]: http://www.jsdblog.com/article/273