/**
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* 对企业微信发送给企业后台的消息加解密示例代码.
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*
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* @copyright Copyright (c) 1998-2014 Tencent Inc.
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*/
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// ------------------------------------------------------------------------
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/**
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* 针对org.apache.commons.codec.binary.Base64，
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* 需要导入架包commons-codec-1.9（或commons-codec-1.8等其他版本）
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* 官方下载地址：http://commons.apache.org/proper/commons-codec/download_codec.cgi
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*/
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package com.qq.weixin.mp.aes;
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import java.nio.charset.Charset;
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import java.util.Arrays;
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import java.util.Random;
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import javax.crypto.Cipher;
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import javax.crypto.spec.IvParameterSpec;
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import javax.crypto.spec.SecretKeySpec;
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import org.apache.commons.codec.binary.Base64;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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/**
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* 提供接收和推送给企业微信消息的加解密接口(UTF8编码的字符串).
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* <ol>
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* <li>第三方回复加密消息给企业微信</li>
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* <li>第三方收到企业微信发送的消息，验证消息的安全性，并对消息进行解密。</li>
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* </ol>
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* 说明：异常java.security.InvalidKeyException:illegal Key Size的解决方案
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* <ol>
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* <li>在官方网站下载JCE无限制权限策略文件（JDK7的下载地址：
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* http://www.oracle.com/technetwork/java/javase/downloads/jce-7-download-432124.html</li>
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* <li>下载后解压，可以看到local_policy.jar和US_export_policy.jar以及readme.txt</li>
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* <li>如果安装了JRE，将两个jar文件放到%JRE_HOME%\lib\security目录下覆盖原来的文件</li>
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* <li>如果安装了JDK，将两个jar文件放到%JDK_HOME%\jre\lib\security目录下覆盖原来文件</li>
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* </ol>
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*/
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public class WXBizMsgCrypt {
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//log4j日志
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private static Logger logger = LoggerFactory.getLogger(WXBizMsgCrypt.class.getName());
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static Charset CHARSET = Charset.forName("utf-8");
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Base64 base64 = new Base64();
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byte[] aesKey;
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String token;
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String receiveid;
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/**
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* 构造函数
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* @param token 企业微信后台，开发者设置的token
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* @param encodingAesKey 企业微信后台，开发者设置的EncodingAESKey
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* @param receiveid, 不同场景含义不同，详见文档
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*
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* @throws AesException 执行失败，请查看该异常的错误码和具体的错误信息
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*/
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public WXBizMsgCrypt(String token, String encodingAesKey, String receiveid) throws AesException {
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if (encodingAesKey.length() != 43) {
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throw new AesException(AesException.IllegalAesKey);
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}
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this.token = token;
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this.receiveid = receiveid;
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aesKey = Base64.decodeBase64(encodingAesKey + "=");
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}
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// 生成4个字节的网络字节序
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byte[] getNetworkBytesOrder(int sourceNumber) {
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byte[] orderBytes = new byte[4];
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orderBytes[3] = (byte) (sourceNumber & 0xFF);
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orderBytes[2] = (byte) (sourceNumber >> 8 & 0xFF);
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orderBytes[1] = (byte) (sourceNumber >> 16 & 0xFF);
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orderBytes[0] = (byte) (sourceNumber >> 24 & 0xFF);
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return orderBytes;
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}
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// 还原4个字节的网络字节序
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int recoverNetworkBytesOrder(byte[] orderBytes) {
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int sourceNumber = 0;
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for (int i = 0; i < 4; i++) {
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sourceNumber <<= 8;
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sourceNumber |= orderBytes[i] & 0xff;
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}
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return sourceNumber;
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}
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// 随机生成16位字符串
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String getRandomStr() {
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String base = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
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Random random = new Random();
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StringBuffer sb = new StringBuffer();
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for (int i = 0; i < 16; i++) {
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int number = random.nextInt(base.length());
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sb.append(base.charAt(number));
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}
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return sb.toString();
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}
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/**
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* 对明文进行加密.
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*
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* @param text 需要加密的明文
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* @return 加密后base64编码的字符串
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* @throws AesException aes加密失败
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*/
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String encrypt(String randomStr, String text) throws AesException {
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ByteGroup byteCollector = new ByteGroup();
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byte[] randomStrBytes = randomStr.getBytes(CHARSET);
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byte[] textBytes = text.getBytes(CHARSET);
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byte[] networkBytesOrder = getNetworkBytesOrder(textBytes.length);
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byte[] receiveidBytes = receiveid.getBytes(CHARSET);
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// randomStr + networkBytesOrder + text + receiveid
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byteCollector.addBytes(randomStrBytes);
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byteCollector.addBytes(networkBytesOrder);
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byteCollector.addBytes(textBytes);
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byteCollector.addBytes(receiveidBytes);
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// ... + pad: 使用自定义的填充方式对明文进行补位填充
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byte[] padBytes = PKCS7Encoder.encode(byteCollector.size());
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byteCollector.addBytes(padBytes);
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// 获得最终的字节流, 未加密
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byte[] unencrypted = byteCollector.toBytes();
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try {
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// 设置加密模式为AES的CBC模式
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Cipher cipher = Cipher.getInstance("AES/CBC/NoPadding");
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SecretKeySpec keySpec = new SecretKeySpec(aesKey, "AES");
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IvParameterSpec iv = new IvParameterSpec(aesKey, 0, 16);
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cipher.init(Cipher.ENCRYPT_MODE, keySpec, iv);
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// 加密
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byte[] encrypted = cipher.doFinal(unencrypted);
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// 使用BASE64对加密后的字符串进行编码
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String base64Encrypted = base64.encodeToString(encrypted);
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return base64Encrypted;
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} catch (Exception e) {
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e.printStackTrace();
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throw new AesException(AesException.EncryptAESError);
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}
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}
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/**
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* 对密文进行解密.
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*
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* @param text 需要解密的密文
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* @return 解密得到的明文
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* @throws AesException aes解密失败
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*/
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String decrypt(String text) throws AesException {
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byte[] original;
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try {
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// 设置解密模式为AES的CBC模式
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Cipher cipher = Cipher.getInstance("AES/CBC/NoPadding");
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SecretKeySpec key_spec = new SecretKeySpec(aesKey, "AES");
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IvParameterSpec iv = new IvParameterSpec(Arrays.copyOfRange(aesKey, 0, 16));
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cipher.init(Cipher.DECRYPT_MODE, key_spec, iv);
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// 使用BASE64对密文进行解码
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byte[] encrypted = Base64.decodeBase64(text);
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// 解密
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original = cipher.doFinal(encrypted);
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} catch (Exception e) {
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logger.info("aes解密报错：",e);
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e.printStackTrace();
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throw new AesException(AesException.DecryptAESError);
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}
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String xmlContent, from_receiveid;
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try {
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// 去除补位字符
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byte[] bytes = PKCS7Encoder.decode(original);
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// 分离16位随机字符串,网络字节序和receiveid
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byte[] networkOrder = Arrays.copyOfRange(bytes, 16, 20);
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int xmlLength = recoverNetworkBytesOrder(networkOrder);
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xmlContent = new String(Arrays.copyOfRange(bytes, 20, 20 + xmlLength), CHARSET);
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from_receiveid = new String(Arrays.copyOfRange(bytes, 20 + xmlLength, bytes.length),
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CHARSET);
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} catch (Exception e) {
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e.printStackTrace();
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throw new AesException(AesException.IllegalBuffer);
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}
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// receiveid不相同的情况
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if (!from_receiveid.equals(receiveid)) {
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throw new AesException(AesException.ValidateCorpidError);
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}
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return xmlContent;
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}
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/**
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* 将企业微信回复用户的消息加密打包.
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* <ol>
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* <li>对要发送的消息进行AES-CBC加密</li>
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* <li>生成安全签名</li>
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* <li>将消息密文和安全签名打包成xml格式</li>
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* </ol>
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*
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* @param replyMsg 企业微信待回复用户的消息，xml格式的字符串
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* @param timeStamp 时间戳，可以自己生成，也可以用URL参数的timestamp
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* @param nonce 随机串，可以自己生成，也可以用URL参数的nonce
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*
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* @return 加密后的可以直接回复用户的密文，包括msg_signature, timestamp, nonce, encrypt的xml格式的字符串
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* @throws AesException 执行失败，请查看该异常的错误码和具体的错误信息
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*/
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public String EncryptMsg(String replyMsg, String timeStamp, String nonce) throws AesException {
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// 加密
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String encrypt = encrypt(getRandomStr(), replyMsg);
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// 生成安全签名
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if (timeStamp == "") {
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timeStamp = Long.toString(System.currentTimeMillis());
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}
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String signature = SHA1.getSHA1(token, timeStamp, nonce, encrypt);
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// System.out.println("发送给平台的签名是: " + signature[1].toString());
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// 生成发送的xml
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String result = XMLParse.generate(encrypt, signature, timeStamp, nonce);
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return result;
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}
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/**
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* 检验消息的真实性，并且获取解密后的明文.
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* <ol>
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* <li>利用收到的密文生成安全签名，进行签名验证</li>
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* <li>若验证通过，则提取xml中的加密消息</li>
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* <li>对消息进行解密</li>
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* </ol>
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*
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* @param msgSignature 签名串，对应URL参数的msg_signature
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* @param timeStamp 时间戳，对应URL参数的timestamp
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* @param nonce 随机串，对应URL参数的nonce
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* @param postData 密文，对应POST请求的数据
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*
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* @return 解密后的原文
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* @throws AesException 执行失败，请查看该异常的错误码和具体的错误信息
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*/
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public String DecryptMsg(String msgSignature, String timeStamp, String nonce, String postData)
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throws AesException {
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// 密钥，公众账号的app secret
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// 提取密文
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Object[] encrypt = XMLParse.extract(postData);
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// 验证安全签名
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String signature = SHA1.getSHA1(token, timeStamp, nonce, encrypt[1].toString());
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// 和URL中的签名比较是否相等
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// System.out.println("第三方收到URL中的签名：" + msg_sign);
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// System.out.println("第三方校验签名：" + signature);
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if (!signature.equals(msgSignature)) {
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throw new AesException(AesException.ValidateSignatureError);
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}
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// 解密
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String result = decrypt(encrypt[1].toString());
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return result;
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}
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/**
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* 验证URL
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* @param msgSignature 签名串，对应URL参数的msg_signature
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* @param timeStamp 时间戳，对应URL参数的timestamp
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* @param nonce 随机串，对应URL参数的nonce
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* @param echoStr 随机串，对应URL参数的echostr
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*
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* @return 解密之后的echostr
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* @throws AesException 执行失败，请查看该异常的错误码和具体的错误信息
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*/
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public String VerifyURL(String msgSignature, String timeStamp, String nonce, String echoStr)
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throws AesException {
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String signature = SHA1.getSHA1(token, timeStamp, nonce, echoStr);
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if (!signature.equals(msgSignature)) {
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throw new AesException(AesException.ValidateSignatureError);
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}
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String result = decrypt(echoStr);
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return result;
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}
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}
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