package org.springblade.common.utils;
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import com.google.common.hash.Hashing;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import java.io.IOException;
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import java.security.MessageDigest;
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import java.util.Arrays;
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import java.util.Map;
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public class Md5SignUtil {
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private final static Logger logger = LoggerFactory.getLogger(Md5SignUtil.class);
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public static String signRequest(Map<String, Object> params, String secret) throws IOException {
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// 第一步：检查参数是否已经排序
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String[] keys = params.keySet().toArray(new String[0]);
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Arrays.sort(keys);
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// 第二步：把所有参数名和参数值串在一起
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StringBuilder query = new StringBuilder();
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query.append(secret);
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for (String key : keys) {
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Object o = params.get(key);
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if (o!= null && o!="") {
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query.append(key).append(o);
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}
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}
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query.append(secret);
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// logger.info("query={}",query);
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// 第三步：使用MD5加密
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byte[] bytes = encryptMD5(query.toString());
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// 第四步：把二进制转化为大写的十六进制(正确签名应该为32大写字符串，此方法需要时使用)
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return byte2hex(bytes);
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}
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public static byte[] encryptMD5(String data) throws IOException {
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return Hashing.md5().hashBytes(data.getBytes("utf-8")).asBytes();
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}
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public static String byte2hex(byte[] bytes) {
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StringBuilder sign = new StringBuilder();
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for (int i = 0; i < bytes.length; i++) {
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String hex = Integer.toHexString(bytes[i] & 0xFF);
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if (hex.length() == 1) {
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sign.append("0");
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}
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sign.append(hex.toUpperCase());
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}
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return sign.toString();
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}
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/***
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* MD5加码 生成32位md5码
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*/
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public static String string2MD5(String inStr) {
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MessageDigest md5 = null;
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try {
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md5 = MessageDigest.getInstance("MD5");
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} catch (Exception e) {
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e.printStackTrace();
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return "";
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}
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char[] charArray = inStr.toCharArray();
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byte[] byteArray = new byte[charArray.length];
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for (int i = 0; i < charArray.length; i++) {
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byteArray[i] = (byte) charArray[i];
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}
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byte[] md5Bytes = md5.digest(byteArray);
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StringBuffer hexValue = new StringBuffer();
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for (int i = 0; i < md5Bytes.length; i++) {
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int val = ((int) md5Bytes[i]) & 0xff;
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if (val < 16) {
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hexValue.append("0");
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}
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hexValue.append(Integer.toHexString(val));
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}
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return hexValue.toString();
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}
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/**
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* 加密解密算法 执行一次加密，两次解密
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*/
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public static String convertMD5(String inStr) {
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char[] a = inStr.toCharArray();
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for (int i = 0; i < a.length; i++) {
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a[i] = (char) (a[i] ^ 't');
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}
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String s = new String(a);
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return s;
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}
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}
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