Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class Main {
    private static final char hexDigits[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D',
            'E', 'F' };

    public static String encryptMD5ToString(String data) {
        return encryptMD5ToString(data.getBytes());
    }

    public static String encryptMD5ToString(String data, String salt) {
        return bytes2HexString(encryptMD5((data + salt).getBytes()));
    }

    public static String encryptMD5ToString(byte[] data) {
        return bytes2HexString(encryptMD5(data));
    }

    public static String encryptMD5ToString(byte[] data, byte[] salt) {
        if (data == null || salt == null)
            return null;
        byte[] dataSalt = new byte[data.length + salt.length];
        System.arraycopy(data, 0, dataSalt, 0, data.length);
        System.arraycopy(salt, 0, dataSalt, data.length, salt.length);
        return bytes2HexString(encryptMD5(dataSalt));
    }

    private static String bytes2HexString(byte[] bytes) {
        if (bytes == null)
            return null;
        int len = bytes.length;
        if (len <= 0)
            return null;
        char[] ret = new char[len << 1];
        for (int i = 0, j = 0; i < len; i++) {
            ret[j++] = hexDigits[bytes[i] >>> 4 & 0x0f];
            ret[j++] = hexDigits[bytes[i] & 0x0f];
        }
        return new String(ret);
    }

    public static byte[] encryptMD5(byte[] data) {
        return hashTemplate(data, "MD5");
    }

    private static byte[] hashTemplate(byte[] data, String algorithm) {
        if (data == null || data.length <= 0)
            return null;
        try {
            MessageDigest md = MessageDigest.getInstance(algorithm);
            md.update(data);
            return md.digest();
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
            return null;
        }
    }
}