Java之——实现微信小程序加密数据解密算法

java

转载请注明出处:http://blog.csdn.net/l1028386804/article/details/79450115

一、概述

微信推出了小程序,很多公司的客户端应用不仅具有了APP、H5、还接入了小程序开发。但是,小程序中竟然没有提供Java版本的加密数据解密算法。这着实让广大的Java开发人员蛋疼。

微信小程序提供的加密数据解密算法链接为:https://mp.weixin.qq.com/debug/wxadoc/dev/api/signature.html

最新地址为:https://developers.weixin.qq.com/miniprogram/dev/framework/open-ability/signature.html

我们下载的算法示例如下:

木有Java!! 木有Java!! 木有Java!!

那么如何解决这个问题,我们一起来实现Java版本的微信小程序加密数据解密算法。

二、实现Java版本的微信小程序加密数据解密算法

1、创建项目

这里,我们创建一个Maven工程,具体创建步骤略。

2、配置pom.xml

我们在pom.xml中加入如下配置。

<dependency>

<groupId>org.bouncycastle</groupId>

<artifactId>bcprov-jdk16</artifactId>

<version>1.46</version>

</dependency>

<dependency>

<groupId>commons-codec</groupId>

<artifactId>commons-codec</artifactId>

<version>1.4</version>

</dependency>

<dependency>

<groupId>net.sf.json-lib</groupId>

<artifactId>json-lib</artifactId>

<version>2.2.3</version>

<classifier>jdk15</classifier>

</dependency>

3、实现AES类

package com.chwl.medical.crypto.wx;

import java.security.AlgorithmParameters;

import java.security.InvalidAlgorithmParameterException;

import java.security.InvalidKeyException;

import java.security.Key;

import java.security.NoSuchAlgorithmException;

import java.security.NoSuchProviderException;

import java.security.Security;

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.bouncycastle.jce.provider.BouncyCastleProvider;

/**

* AES加密

* @author liuyazhuang

*

*/

public class AES {

public static boolean initialized = false;

/**

* AES解密

*

* @param content

* 密文

* @return

* @throws InvalidAlgorithmParameterException

* @throws NoSuchProviderException

*/

public 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;

}

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;

}

}

4、实现WxPKCS7Encoder类

package com.chwl.medical.crypto.wx;

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;

}

}

5、实现WXCore类

这个类主要是对具体算法的封装,统一对外提供方法。

package com.chwl.medical.crypto.wx;

import org.apache.commons.codec.binary.Base64;

import net.sf.json.JSONObject;

/**

* 封装对外访问方法

* @author liuyazhuang

*

*/

public class WXCore {

private static final String WATERMARK = "watermark";

private static final String APPID = "appid";

/**

* 解密数据

* @return

* @throws Exception

*/

public static String decrypt(String appId, String encryptedData, String sessionKey, String iv){

String result = "";

try {

AES aes = new AES();

byte[] resultByte = aes.decrypt(Base64.decodeBase64(encryptedData), Base64.decodeBase64(sessionKey), Base64.decodeBase64(iv));

if(null != resultByte && resultByte.length > 0){

result = new String(WxPKCS7Encoder.decode(resultByte));

JSONObject jsonObject = JSONObject.fromObject(result);

String decryptAppid = jsonObject.getJSONObject(WATERMARK).getString(APPID);

if(!appId.equals(decryptAppid)){

result = "";

}

}

} catch (Exception e) {

result = "";

e.printStackTrace();

}

return result;

}

public static void main(String[] args) throws Exception{

String appId = "wx4f4bc4dec97d474b";

String encryptedData = "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";

String sessionKey = "tiihtNczf5v6AKRyjwEUhQ==";

String iv = "r7BXXKkLb8qrSNn05n0qiA==";

System.out.println(decrypt(appId, encryptedData, sessionKey, iv));

}

}

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