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/*
 * Copyright 1999-2018 Alibaba Group Holding Ltd.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.alibaba.nacos.common.util;

import java.io.UnsupportedEncodingException;

/**
 * MD5 generator
 *
 * @author nacos
 */
public class Md5Utils {

    private static final int HEX_VALUE_COUNT = 16;

    public static String getMD5(byte[] bytes) {
        char[] hexDigits = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'};
        char[] str = new char[16 * 2];
        try {
            java.security.MessageDigest md = java.security.MessageDigest.getInstance("MD5");
            md.update(bytes);
            byte[] tmp = md.digest();
            int k = 0;
            for (int i = 0; i < HEX_VALUE_COUNT; i++) {
                byte byte0 = tmp[i];
                str[k++] = hexDigits[byte0 >>> 4 & 0xf];
                str[k++] = hexDigits[byte0 & 0xf];
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return new String(str);
    }

    public static String getMD5(String value, String encode) {
        String result = "";
        try {
            result = getMD5(value.getBytes(encode));
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }

        return result;
    }
}