com.beginner.core.utils.MD5.java Source code

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Here is the source code for com.beginner.core.utils.MD5.java

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/*
 * Copyright 2015-9999 the original author or authors.
 *
 * 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.beginner.core.utils;

import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;

import org.apache.commons.codec.digest.DigestUtils;

public class MD5 {

    public static String md5(String str) {
        try {
            MessageDigest md = MessageDigest.getInstance("MD5");
            md.update(str.getBytes());
            byte b[] = md.digest();

            int i;

            StringBuffer buf = new StringBuffer("");
            for (int offset = 0; offset < b.length; offset++) {
                i = b[offset];
                if (i < 0)
                    i += 256;
                if (i < 16)
                    buf.append("0");
                buf.append(Integer.toHexString(i));
            }
            str = buf.toString();
        } catch (Exception e) {
            e.printStackTrace();

        }
        return str;
    }

    /**
     * sign(????) <br />
     * (???  ?)
     * @param text ???
     * @param key 
     * @param input_charset ??
     * @return
     * String ??
     * @exception
     * @since 1.0.0
     */
    public static String sign(String text, String key, String input_charset) {
        text = text + key;
        return DigestUtils.md5Hex(getContentBytes(text, input_charset));
    }

    /**
     * verify(????) <br />
     * (???  ?)
     * @param text ???
     * @param sign ??
     * @param key 
     * @param input_charset ??
     * @return
     * boolean ??
     * @exception
     * @since 1.0.0
     */
    public static boolean verify(String text, String sign, String key, String input_charset) {
        text = text + key;
        String mysign = DigestUtils.md5Hex(getContentBytes(text, input_charset));
        if (mysign.equals(sign)) {
            return true;
        } else {
            return false;
        }
    }

    /**
    * getContentBytes(???) <br />
    * (???  ?)
    * @param content
    * @param charset
    * @return
    * byte[]
    * @exception
    * @since 1.0.0
    */
    private static byte[] getContentBytes(String content, String charset) {
        if (charset == null || "".equals(charset)) {
            return content.getBytes();
        }
        try {
            return content.getBytes(charset);
        } catch (UnsupportedEncodingException e) {
            throw new RuntimeException(
                    "MD5??,??,??:"
                            + charset);
        }
    }

    public static void main(String[] args) {
        String str = "test" + "jp150107113" + "RTEHKA" + "4";
        System.out.println(str);
        System.out.println(md5(str));
    }
}