des.java

用mina框架编写的转发代理服务程序,含自动更新功能

package com.frontMachine.util;

import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;

public class Des
{
	private static final String Algorithm = "DES"; // 定义 加密算法,可用DES,DESede,Blowfish

	// keybyte为加密密钥，长度为8字节
	// src为被加密的数据缓冲区（源）
	public byte[] encryptMode(byte[] keybyte, byte[] src)
	{
		try
		{
			SecretKey deskey = new SecretKeySpec(keybyte, Algorithm);	// 生成密钥
			Cipher c1 = Cipher.getInstance(Algorithm);
			c1.init(Cipher.ENCRYPT_MODE, deskey);						// 加密
			return c1.doFinal(src);	// 加密成功后返回
		}
		catch (java.security.NoSuchAlgorithmException e1)
		{
			e1.printStackTrace();
		}
		catch (javax.crypto.NoSuchPaddingException e2)
		{
			e2.printStackTrace();
		}
		catch (java.lang.Exception e3)
		{
			e3.printStackTrace();
		}
		return null;// 失败返回null
	}

	// keybyte为加密密钥，长度为8字节
	// src为加密后的缓冲区
	public byte[] decryptMode(byte[] keybyte, byte[] src)
	{
		try
		{
			SecretKey deskey = new SecretKeySpec(keybyte, Algorithm);// 生成密钥
			Cipher c1 = Cipher.getInstance(Algorithm);
			c1.init(Cipher.DECRYPT_MODE, deskey);// 解密
			return c1.doFinal(src);
		}
		catch (java.security.NoSuchAlgorithmException e1)
		{
			e1.printStackTrace();
		}
		catch (javax.crypto.NoSuchPaddingException e2)
		{
			e2.printStackTrace();
		}
		catch (BadPaddingException ex)
		{
			System.out.println("解码失败");
		}
		catch (java.lang.Exception e3)
		{

			e3.printStackTrace();
		}
		return null;
	}

	// 转换成十六进制字符串
	public String byte2hex(byte[] b)
	{
		if(b==null)
		{
			return "";
		}
		String hs = "";
		String stmp = "";
		for (int n = 0; n < b.length; n++)
		{
			//System.out.println("-----------["+b[n]+"]---------");
			stmp = (java.lang.Integer.toHexString(b[n] & 0XFF));
			if (stmp.length() == 1)
				hs = hs + "0" + stmp;
			else
				hs = hs + stmp;
			// if (n<b.length-1) hs=hs+":";
		}
		return hs.toUpperCase();
	}
	public static void main(String[] arg)
	{
		Des d = new Des();
		long st = System.currentTimeMillis();
		System.out.println(d.byte2hex(d.encryptMode("ASDFGHJK".getBytes(),"EEEEEEEE".getBytes())));
		System.out.println(d.byte2hex(d.encryptMode("ASDFGHJK".getBytes(),"EEEEEEEE".getBytes())));
		System.out.println(Integer.toString(254,16));
		System.out.println(System.currentTimeMillis()-st);
	}
}