/**
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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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package com.qq.weixin.mp.aes;
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import java.security.MessageDigest;
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import java.util.Arrays;
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/**
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* SHA1 class
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*
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* 计算消息签名接口.
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*/
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class SHA1 {
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/**
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* 用SHA1算法生成安全签名
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* @param token 票据
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* @param timestamp 时间戳
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* @param nonce 随机字符串
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* @param encrypt 密文
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* @return 安全签名
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* @throws AesException
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*/
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public static String getSHA1(String token, String timestamp, String nonce, String encrypt) throws AesException
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{
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try {
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String[] array = new String[] { token, timestamp, nonce, encrypt };
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StringBuffer sb = new StringBuffer();
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// 字符串排序
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Arrays.sort(array);
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for (int i = 0; i < 4; i++) {
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sb.append(array[i]);
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}
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String str = sb.toString();
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// SHA1签名生成
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MessageDigest md = MessageDigest.getInstance("SHA-1");
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md.update(str.getBytes());
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byte[] digest = md.digest();
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StringBuffer hexstr = new StringBuffer();
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String shaHex = "";
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for (int i = 0; i < digest.length; i++) {
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shaHex = Integer.toHexString(digest[i] & 0xFF);
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if (shaHex.length() < 2) {
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hexstr.append(0);
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}
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hexstr.append(shaHex);
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}
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return hexstr.toString();
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} catch (Exception e) {
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e.printStackTrace();
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throw new AesException(AesException.ComputeSignatureError);
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}
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}
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}
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