AzDG可逆加密演算法 for Java

花了一個星期的業餘時間，將AzDGCrypt翻成Java版本
相較VB版的AzDGCrypt，Java版提供自訂私匙傳入參數及指定字元集

import java.io.UnsupportedEncodingException;
import java.util.*;
import java.security.*; 
    
public class AzDg
{ 
    private static String strPrivateKey = "0123456789";
    
    public static byte[] encode(byte[] argAbteSource, byte[] argAbteEncryptKey) 
    {
        argAbteEncryptKey = new Md5().getMD5ofStr(new String(argAbteEncryptKey)).toLowerCase().getBytes();
        byte bteCRCLength = 0;  
        byte[] abteReturn = new byte[argAbteSource.length];
        for (int i = 0; i < argAbteSource.length; ++i)
        {
            bteCRCLength = (bteCRCLength > 31) ? 0 : bteCRCLength;
            abteReturn[i] = (byte)(argAbteSource[i] ^ argAbteEncryptKey[bteCRCLength++]);
        }
        return abteReturn;
    }
    
    public static String encrypt(String argStrSource)
    {
      return encrypt(argStrSource, strPrivateKey);
    }
    
    public static String encrypt(String argStrSource, String argStrPrivateKey)
    {
    return encrypt(argStrSource, argStrPrivateKey,"UTF8");
    }

    public static String encrypt(String argStrSource, String argStrPrivateKey, String argStrCharset)
    {
        String strReturn = null;
        try
        {
           strReturn = new String(encrypt(argStrSource.getBytes(argStrCharset), argStrPrivateKey.getBytes(argStrCharset)),argStrCharset);
        }
        catch (UnsupportedEncodingException e)
        {
           e.printStackTrace();
        }
        return strReturn;
    }

    public static byte[] encrypt(byte[] argStrSource, byte[] argBteKey) 
    {          
        byte[] abteEncryptKey = new Md5().getMD5ofStr(Long.toString( Calendar.getInstance().getTimeInMillis())).getBytes();
        byte bteCRCLength = 0;  
        byte[] abteReturn = new byte[argStrSource.length * 2];  
        for (int i = 0, j = 0; i < argStrSource.length; ++i, ++j) 
        {
            bteCRCLength = bteCRCLength > 31 ? 0 : bteCRCLength;  
            abteReturn[j] = abteEncryptKey[bteCRCLength];
            ++j;
            abteReturn[j] = (byte)(argStrSource[i] ^ abteEncryptKey[bteCRCLength++]);
        }        
        return Base64.encode(encode(abteReturn, argBteKey));
    }
     
    public static String decrypt(String argStrSource)
    {
        return decrypt(argStrSource,strPrivateKey);
    }
     
    public static String decrypt(String argStrSource, String argStrPrivateKey)
    {
        return decrypt(argStrSource, argStrPrivateKey, "UTF8");
    }
    
    public static String decrypt(String argStrSource, String argStrPrivateKey, String argStrCharset)
    {
        String strReturn ="";
        try
        {
            strReturn= new String(decrypt(Base64.decode(argStrSource), argStrPrivateKey.getBytes(argStrCharset)),argStrCharset);
        }
        catch (UnsupportedEncodingException e)
        {
           e.printStackTrace();
        }
        return strReturn;
    }

    public static byte[] decrypt(byte[] argStrSource, byte[] argStrPrivateKey) 
    {
        argStrSource = encode(argStrSource, argStrPrivateKey);
        byte[] abteReturn = new byte[(int)(argStrSource.length / 2)]; 
        for (int i = 0, j = 0; i < argStrSource.length; ++i, ++j)
        {
            abteReturn[j] = (byte)(argStrSource[i] ^ argStrSource[++i] );
        }  
        return abteReturn;
    }
    
    
    public static byte[] md5Byte(String d) throws NoSuchAlgorithmException 
    {
        MessageDigest md = MessageDigest.getInstance("MD5");         
        md.update(d.getBytes()); 
        return  md.digest();         
    }        
}