微信获取手机号Java后台解密

package com.code.decode.util;

import java.nio.charset.StandardCharsets;
import java.security.*;
import java.security.spec.InvalidParameterSpecException;
import org.apache.xmlbeans.impl.util.Base64;
import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;

import com.alibaba.fastjson.JSON;
import org.bouncycastle.jce.provider.BouncyCastleProvider;

public class AESForWeixinGetPhoneNumber {

    //加密方式
    private static String keyAlgorithm = "AES";
    //避免重复new生成多个BouncyCastleProvider对象，因为GC回收不了，会造成内存溢出
    //只在第一次调用decrypt()方法时才new 对象
    private static boolean initialized = false;
    //用于Base64解密
    private Base64 decoder = new Base64();

    //待解密的数据
    private String originalContent;
    //会话密钥sessionKey
    private String encryptKey;
    //加密算法的初始向量
    private String iv;

    public AESForWeixinGetPhoneNumber(String originalContent,String encryptKey,String iv) {
        this.originalContent = originalContent;
        this.encryptKey = encryptKey;
        this.iv = iv;
    }

    /**
     * AES解密
     * 填充模式AES/CBC/PKCS7Padding
     * 解密模式128
     *
     * @return 解密后的信息对象
     */
    public WeixinPhoneDecryptInfo decrypt() {
        initialize();
        try {
            //数据填充方式
            Cipher cipher = Cipher.getInstance("AES/CBC/PKCS7Padding");
            Key sKeySpec = new SecretKeySpec(decoder.decode(this.encryptKey.getBytes()), keyAlgorithm);
            // 初始化
            cipher.init(Cipher.DECRYPT_MODE, sKeySpec, generateIV(decoder.decode(this.iv.getBytes())));
            byte[]data = cipher.doFinal(decoder.decode(this.originalContent.getBytes()));
            String datastr = new String(data, StandardCharsets.UTF_8);
            return JSON.toJavaObject(JSON.parseObject(datastr),WeixinPhoneDecryptInfo.class);
        } catch (Exception e) {
            System.out.println(e.getMessage());
            return null;
        }
    }

    /**BouncyCastle作为安全提供，防止我们加密解密时候因为jdk内置的不支持改模式运行报错。**/
    private static void initialize() {
        if (initialized)
            return;
        Security.addProvider(new BouncyCastleProvider());
        initialized = true;
    }

    // 生成iv
    private static AlgorithmParameters generateIV(byte[] iv) throws NoSuchAlgorithmException, InvalidParameterSpecException {
        AlgorithmParameters params = AlgorithmParameters.getInstance(keyAlgorithm);
        params.init(new IvParameterSpec(iv));
        return params;
    }
}

package com.code.decode.util;

public class WeixinWaterMark {
    private Long timestamp;
    private String appid;

    public Long getTimestamp() {
        return timestamp;
    }

    public void setTimestamp(Long timestamp) {
        this.timestamp = timestamp;
    }

    public String getAppid() {
        return appid;
    }

    public void setAppid(String appid) {
        this.appid = appid;
    }
}

package com.code.decode.util;
import com.alibaba.fastjson.JSON;

public class WeixinPhoneDecryptInfo {
    private String phoneNumber;
    private String purePhoneNumber;
    private int countryCode;
    private String watermark;
    private WeixinWaterMark weixinWaterMark;

    public String getPhoneNumber() {
        return phoneNumber;
    }

    public void setPhoneNumber(String phoneNumber) {
        this.phoneNumber = phoneNumber;
    }

    public String getPurePhoneNumber() {
        return purePhoneNumber;
    }

    public void setPurePhoneNumber(String purePhoneNumber) {
        this.purePhoneNumber = purePhoneNumber;
    }

    public int getCountryCode() {
        return countryCode;
    }

    public void setCountryCode(int countryCode) {
        this.countryCode = countryCode;
    }

    public String getWatermark() {
        return watermark;
    }

    public void setWatermark(String watermark) {
        this.watermark = watermark;
        this.weixinWaterMark = JSON.toJavaObject(JSON.parseObject(this.watermark),WeixinWaterMark.class);
    }

    public WeixinWaterMark getWeixinWaterMark(){
        return weixinWaterMark;
    }

    @Override
    public String toString() {
        return "WeixinPhoneDecryptInfo{" +
                "phoneNumber='" + phoneNumber + '\'' +
                ", purePhoneNumber='" + purePhoneNumber + '\'' +
                ", countryCode=" + countryCode +
                ", appid=" + weixinWaterMark.getAppid() +
                ", timestamp=" + weixinWaterMark.getTimestamp() +
                '}';
    }
}

public static void main(String[] args) {
        String encryptedData="";
        String iv="";
        String appId="";
        AESForWeixinGetPhoneNumber aes=new AESForWeixinGetPhoneNumber(encryptedData,"session_key",iv);
        WeixinPhoneDecryptInfo info=aes.decrypt();
        if (null==info){
            System.out.println("error");
        }else {
            if (!info.getWeixinWaterMark().getAppid().equals(appId)){
                System.out.println("wrong appId");
            }
            System.out.println(info.toString());
        }
    }