com.github.aqiu202.util.MD5Utils Maven / Gradle / Ivy

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package com.github.aqiu202.util;

import java.security.MessageDigest;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class MD5Utils {

    private final static Logger log = LoggerFactory.getLogger(MD5Utils.class);

    private MD5Utils() {
    }

    private final static String[] hexDigits = {"0", "1", "2", "3", "4", "5", "6", "7", "8", "9",
            "a", "b", "c", "d",
            "e", "f"};

    /**
     * 转换字节数组为16进制字串
     *
     * @param b 字节数组
     * @return 16进制字串
     */
    public static String byteArrayToHexString(byte[] b) {
        StringBuilder resultSb = new StringBuilder();
        for (byte aB : b) {
            resultSb.append(byteToHexString(aB));
        }
        return resultSb.toString();
    }

    /**
     * 转换byte到16进制
     *
     * @param b 要转换的byte
     * @return 16进制格式
     */
    private static String byteToHexString(byte b) {
        int n = b;
        if (n < 0) {
            n = 256 + n;
        }
        int d1 = n / 16;
        int d2 = n % 16;
        return hexDigits[d1] + hexDigits[d2];
    }

    /**
     * MD5编码
     *
     * @param origin 原始字符串
     * @return 经过MD5加密之后的结果
     */
    public static String encode(String origin) {
        String resultString = null;
        try {
            resultString = origin;
            MessageDigest md = MessageDigest.getInstance("MD5");
            resultString = byteArrayToHexString(md.digest(resultString.getBytes()));
        } catch (Exception e) {
            log.error("", e);
        }
        return resultString;
    }

    public static boolean matched(String origin, String sign) {
        return encode(origin).equals(sign);
    }

}