java微信小程序步数encryptedData和开放数据解密的实现

import java.nio.charset.Charset;
import java.util.Arrays;
/**
 * 微信小程序加解密
 * @author liuyazhuang
 *
 */
public class WxPKCS7Encoder {
  private static final Charset CHARSET = Charset.forName("utf-8");
  private static final int BLOCK_SIZE = 32;
 
  /**
   * 获得对明文进行补位填充的字节.
   *
   * @param count
   *      需要进行填充补位操作的明文字节个数
   * @return 补齐用的字节数组
   */
  public static byte[] encode(int count) {
    // 计算需要填充的位数
    int amountToPad = BLOCK_SIZE - (count % BLOCK_SIZE);
    if (amountToPad == 0) {
      amountToPad = BLOCK_SIZE;
    }
    // 获得补位所用的字符
    char padChr = chr(amountToPad);
    String tmp = new String();
    for (int index = 0; index < amountToPad; index++) {
      tmp += padChr;
    }
    return tmp.getBytes(CHARSET);
  }
 
  /**
   * 删除解密后明文的补位字符
   *
   * @param decrypted
   *      解密后的明文
   * @return 删除补位字符后的明文
   */
  public static byte[] decode(byte[] decrypted) {
    int pad = decrypted[decrypted.length - 1];
    if (pad < 1 || pad > 32) {
      pad = 0;
    }
    return Arrays.copyOfRange(decrypted, 0, decrypted.length - pad);
  }
 
  /**
   * 将数字转化成ASCII码对应的字符，用于对明文进行补码
   *
   * @param a
   *      需要转化的数字
   * @return 转化得到的字符
   */
  public static char chr(int a) {
    byte target = (byte) (a & 0xFF);
    return (char) target;
  }
}

import java.io.UnsupportedEncodingException;
import java.security.AlgorithmParameters;
import java.security.InvalidAlgorithmParameterException;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.security.Security;
import java.security.spec.InvalidParameterSpecException;
import java.util.HashMap;

import javax.annotation.Resource;
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 org.apache.commons.codec.binary.Base64;
import org.apache.commons.lang3.StringUtils;
import org.bouncycastle.jce.provider.BouncyCastleProvider;


import lombok.extern.slf4j.Slf4j;
@Slf4j
public class AesCbcUtil {

  static {
     //BouncyCastle是一个开源的加解密解决方案，主页在http://www.bouncycastle.org/
     Security.addProvider(new BouncyCastleProvider());
   }
 
   /**
   * AES解密
   *
   * @param data      //密文，被加密的数据
   * @param key      //秘钥
   * @param iv       //偏移量
   * @param encodingFormat //解密后的结果需要进行的编码
  * @param type //0 是其他 1是微信步数
   * @return
   * @throws Exception
   */
   public static String decrypt(String data, String key, String iv, String encodingFormat,Integer type) throws Exception {
//     initialize();
   if(StringUtils.isEmpty(data)||StringUtils.isEmpty(key)||StringUtils.isEmpty(iv))
    throw new SkyParamNullException("小程序获取用户信息参数不能为空");
     //被加密的数据
     byte[] dataByte = Base64.decodeBase64(data);
     //加密秘钥
     byte[] keyByte = Base64.decodeBase64(key);
     //偏移量
     byte[] ivByte = Base64.decodeBase64(iv);
 
 
     try {
       Cipher cipher = Cipher.getInstance("AES/CBC/PKCS7Padding");
 
       SecretKeySpec spec = new SecretKeySpec(keyByte, "AES");
 
       AlgorithmParameters parameters = AlgorithmParameters.getInstance("AES");
       parameters.init(new IvParameterSpec(ivByte));
 
       cipher.init(Cipher.DECRYPT_MODE, spec, parameters);// 初始化
 
       byte[] resultByte = cipher.doFinal(dataByte);
       if (null != resultByte && resultByte.length > 0) {
       if (type==1){
   return new String(WxPKCS7Encoder.decode(resultByte));

   }else {
   return new String(resultByte, encodingFormat);

   }


       }
       return null;
     } catch (NoSuchAlgorithmException e) {
       e.printStackTrace();
       log.error("小程序解析出错1{}",e.getMessage());
     } catch (NoSuchPaddingException e) {
       e.printStackTrace();
       log.error("小程序解析出错2{}",e.getMessage());
     } catch (InvalidParameterSpecException e) {
       e.printStackTrace();
       log.error("小程序解析出错3{}",e.getMessage());
     } catch (InvalidKeyException e) {
       e.printStackTrace();
       log.error("小程序解析出错4{}",e.getMessage());
     } catch (InvalidAlgorithmParameterException e) {
       e.printStackTrace();
       log.error("小程序解析出错5{}",e.getMessage());
     } catch (IllegalBlockSizeException e) {
       e.printStackTrace();
       log.error("小程序解析出错6{}",e.getMessage());
     } catch (BadPaddingException e) {
       e.printStackTrace();
       log.error("小程序解析出错7{}",e.getMessage());
     }
  catch (UnsupportedEncodingException e) {
  e.printStackTrace();
  log.error("小程序解析出错8{}",e.getMessage());
  }
     return null;
   }
}

@ApiOperation(value = "wx步数解密")
  @PostMapping(value = "/decode")
  public ResultModel<Object> questionList(@RequestBody WxSportParam param) throws Exception {
    HashMap<String, Object> map = wxXiaoChenXuUtil.getWxOpenId(//这个方法网上很多，没有就用binarywang的
     param.getCode()//前端提供的code
     ,sysProperties.getWxAppId()//appID
      ,sysProperties.getWxAppSecret());//secret
    String sessionKey = map.get("session_key").toString();
    String result = AesCbcUtil.decrypt(param.getData(), sessionKey,param.getIv(), "UTF-8",1);

    return ResultModel.success(result);
  }

{ “stepInfoList”: [
 {
“timestamp”: 1445866601,
“step”: 100
 },
 {
“timestamp”: 1445876601,
“step”: 120
 } ] }