微信小程序用户信息AES-128-CBC Java 解密

欢迎转载：攻城狮不是猫 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 map = new HashMap<>();
        map.put("encryptedData", encryptedData);
        map.put("sessionKey", sessionKey);
        map.put("iv", iv);
        map.put("appId", appId);
        Map map1 = new HashMap<>();
        map1.put("wxapplet", map);
        String wxapplet =  JSON.toJSON(map1).toString();
        System.out.println(wxapplet);

    }
}