📄 fileencrypter.java.bak
字号:
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.io.*;
import java.security.*;
import javax.crypto.*;
import javax.crypto.spec.*;
//================================================================================================================================
//构造窗体，注册事件监听，事件响应
public class FileEncrypter extends JFrame
{
public static final int WIDTH = 550;
public static final int HEIGHT = 200;
public static AbstractButton button;
FileEncrypter()
{
setSize(WIDTH,HEIGHT);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setResizable(false);
Toolkit tk = Toolkit.getDefaultToolkit();
final Dimension screenSize = tk.getScreenSize();
setLocation((screenSize.width - WIDTH)/2, (screenSize.height - HEIGHT)/2);
setTitle("文件加密器");
final Container c = this.getContentPane();
c.setLayout( new FlowLayout());
JMenuBar bar = new JMenuBar();
JMenu setting,help;
setting = new JMenu ("设置(S)");
help = new JMenu ("帮助(H)");
JMenuItem about;
about = new JMenuItem("关于...",KeyEvent.VK_A);
about.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent event)
{
JDialog d = new JDialog();
d.setTitle("关于FileEncrypter");
d.setLocation((screenSize.width - WIDTH + 200)/2, (screenSize.height - HEIGHT)/2);
d.setSize(350,200);
JPanel p=new JPanel();
p.setLayout(new GridLayout(5,1));
d.add(p);
JLabel userName=new JLabel(" 本机的用户名为："+System.getProperty("user.name"));
JLabel osName=new JLabel(" 本机的操作系统是："+System.getProperty("os.name"));
JLabel javaVersion=new JLabel(" 本机中所安装的Java SDK的版本号是："+System.getProperty("java.version"));
p.add(new JLabel(" FileEncrypter程序 "));
p.add(osName);
p.add(userName);
p.add(javaVersion);
p.add(new JLabel(" 200610404141 马宗骁"));
getDefaultCloseOperation();
d.setResizable(false);
d.setVisible(true);
}
});
JRadioButtonMenuItem specialRadio1 = new JRadioButtonMenuItem("替代加密算法");
JRadioButtonMenuItem specialRadio2 = new JRadioButtonMenuItem("三重DES加密算法");
class ItemHandler implements ItemListener
{
public void itemStateChanged(ItemEvent e)
{
button = (AbstractButton) e.getItem();
}
}
specialRadio1.addItemListener(new ItemHandler());
specialRadio2.addItemListener(new ItemHandler());
ButtonGroup buttonGroup1 = new ButtonGroup();
bar.add(setting);
setting.setMnemonic(KeyEvent.VK_F);
bar.add(help);
help.setMnemonic(KeyEvent.VK_H);
setting.add(specialRadio1);
setting.add(specialRadio2);
buttonGroup1.add(specialRadio1);
buttonGroup1.add(specialRadio2);
help.add(about);
setJMenuBar (bar);
final FilePanel fp = new FilePanel("文件选择");
c.add(fp);
final KeyPanel pp = new KeyPanel(" 密码 ");
c.add(pp);
JButton jbE = new JButton("加密");
c.add(jbE);
jbE.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent event)
{
if(button == null)
JOptionPane.showMessageDialog(null,"请选择加密方式！","提示",JOptionPane.OK_OPTION);
else
{
File file = new File(fp.getFileName());
if (file.exists()&&button.getText().equals("三重DES加密算法"))
encrypt_des(file.getAbsoluteFile(),pp.getKey());
else if(file.exists()&&button.getText().equals("替代加密算法"))
encrypt_tidai(file.getAbsoluteFile(),pp.getKey());
else
JOptionPane.showMessageDialog(null,"请选择文件！","提示",JOptionPane.OK_OPTION);
}
}
});
JButton jbD = new JButton("解密");
c.add(jbD);
jbD.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent event)
{
if(button == null)
JOptionPane.showMessageDialog(null,"请选择加密方式！","提示",JOptionPane.OK_OPTION);
else
{
File file = new File(fp.getFileName());
if (file.exists()&&button.getText().equals("三重DES加密算法"))
decrypt_des(file.getAbsoluteFile(),pp.getKey());
else if(file.exists()&&button.getText().equals("替代加密算法"))
decrypt_kaisa(file.getAbsoluteFile(),pp.getKey());
else
JOptionPane.showMessageDialog(null,"请选择文件！","提示",JOptionPane.OK_OPTION);
}
}
});
setVisible(true);
}
//================================================================================================================================
//3DES算法
private void encrypt_des(File fileIn,String sKey)
{
/*
在此添加加密函数
实现加密
*/
try
{
if(sKey.length() == 48)
{
byte[] bytK1 = getKeyByStr(sKey.substring(0,16));
byte[] bytK2 = getKeyByStr(sKey.substring(16,32));
byte[] bytK3 = getKeyByStr(sKey.substring(32,48));
FileInputStream fis = new FileInputStream(fileIn);
byte[] bytIn = new byte[(int)fileIn.length()];
for(int i = 0;i<fileIn.length();i++)
{
bytIn[i] = (byte)fis.read();
}
//加密
byte[] bytOut = encryptByDES(encryptByDES(
encryptByDES(bytIn,bytK1),bytK2),bytK3);
String fileOut = fileIn.getPath() + ".tdes";
FileOutputStream fos = new FileOutputStream(fileOut);
for(int i = 0;i<bytOut.length;i++)
{
fos.write((int)bytOut[i]);
}
fos.close();
JOptionPane.showMessageDialog(this,"加密成功！","提示",JOptionPane.OK_OPTION);
}
else
JOptionPane.showMessageDialog(this,"密码长度必须等于48！","错误信息",JOptionPane.ERROR_MESSAGE);
}
catch(Exception e)
{
e.printStackTrace();
}
}
/*
在此添加解密函数
实现解密
*/
/**
解密函数
输入：
要解密的文件，密码（由0-F组成，共48个字符，表示3个8位的密码）如：
AD67EA2F3BE6E5ADD368DFE03120B5DF92A8FD8FEC2F0746
其中：
AD67EA2F3BE6E5AD DES密码一
D368DFE03120B5DF DES密码二
92A8FD8FEC2F0746 DES密码三
输出：
对输入的文件解密后，保存到用户指定的文件中。
*/
private void decrypt_des(File fileIn,String sKey)
{
try
{
if(sKey.length() == 48)
{
String strPath = fileIn.getPath();
if(strPath.substring(strPath.length()-5).toLowerCase().equals(".tdes"))
strPath = strPath.substring(0,strPath.length()-5);
else
{
JOptionPane.showMessageDialog(this,"不是合法的加密文件！","提示",JOptionPane.OK_OPTION);
return;
}
JFileChooser chooser = new JFileChooser();
chooser.setCurrentDirectory(new File("."));
chooser.setSelectedFile(new File(strPath));
//用户指定要保存的文件
int ret = chooser.showSaveDialog(this);
if(ret==JFileChooser.APPROVE_OPTION)
{
byte[] bytK1 = getKeyByStr(sKey.substring(0,16));
byte[] bytK2 = getKeyByStr(sKey.substring(16,32));
byte[] bytK3 = getKeyByStr(sKey.substring(32,48));
FileInputStream fis = new FileInputStream(fileIn);
byte[] bytIn = new byte[(int)fileIn.length()];
for(int i = 0;i<fileIn.length();i++)
{
bytIn[i] = (byte)fis.read();
}
//解密
byte[] bytOut = decryptByDES(decryptByDES(
decryptByDES(bytIn,bytK3),bytK2),bytK1);
File fileOut = chooser.getSelectedFile();
fileOut.createNewFile();
FileOutputStream fos = new FileOutputStream(fileOut);
for(int i = 0;i<bytOut.length;i++)
{
fos.write((int)bytOut[i]);
}
fos.close();
JOptionPane.showMessageDialog(this,"解密成功！","提示",JOptionPane.OK_OPTION);
}
}
else
JOptionPane.showMessageDialog(this,"密码长度必须等于48！","错误信息",JOptionPane.ERROR_MESSAGE);
}
catch(Exception e)
{
JOptionPane.showMessageDialog(this,"解密失败，请核对密码！","提示",JOptionPane.OK_OPTION);
}
}
/**
用DES方法加密输入的字节
bytKey需为8字节长，是加密的密码
*/
private byte[] encryptByDES(byte[] bytP,byte[] bytKey) throws Exception
{
DESKeySpec desKS = new DESKeySpec(bytKey);
SecretKeyFactory skf = SecretKeyFactory.getInstance("DES");
SecretKey sk = skf.generateSecret(desKS);
Cipher cip = Cipher.getInstance("DES");
cip.init(Cipher.ENCRYPT_MODE,sk);
return cip.doFinal(bytP);
}
/**
用DES方法解密输入的字节
bytKey需为8字节长，是解密的密码
*/
private byte[] decryptByDES(byte[] bytE,byte[] bytKey) throws Exception
{
DESKeySpec desKS = new DESKeySpec(bytKey);
SecretKeyFactory skf = SecretKeyFactory.getInstance("DES");
SecretKey sk = skf.generateSecret(desKS);
Cipher cip = Cipher.getInstance("DES");
cip.init(Cipher.DECRYPT_MODE,sk);
return cip.doFinal(bytE);
}
/**
输入密码的字符形式，返回字节数组形式。
如输入字符串：AD67EA2F3BE6E5AD
返回字节数组：{173,103,234,47,59,230,229,173}
*/
private byte[] getKeyByStr(String str)
{
byte[] bRet = new byte[str.length()/2];
for(int i=0;i<str.length()/2;i++)
{
Integer itg = new Integer(16*getChrInt(str.charAt(2*i)) + getChrInt(str.charAt(2*i+1)));
bRet[i] = itg.byteValue();
}
return bRet;
}
/**
计算一个16进制字符的10进制值
输入：0-F
*/
private int getChrInt(char chr)
{
int iRet=0;
if(chr=="0".charAt(0)) iRet = 0;
if(chr=="1".charAt(0)) iRet = 1;
if(chr=="2".charAt(0)) iRet = 2;
if(chr=="3".charAt(0)) iRet = 3;
if(chr=="4".charAt(0)) iRet = 4;
if(chr=="5".charAt(0)) iRet = 5;
if(chr=="6".charAt(0)) iRet = 6;
if(chr=="7".charAt(0)) iRet = 7;
if(chr=="8".charAt(0)) iRet = 8;
if(chr=="9".charAt(0)) iRet = 9;
if(chr=="A".charAt(0)) iRet = 10;
if(chr=="B".charAt(0)) iRet = 11;
if(chr=="C".charAt(0)) iRet = 12;
if(chr=="D".charAt(0)) iRet = 13;
if(chr=="E".charAt(0)) iRet = 14;
if(chr=="F".charAt(0)) iRet = 15;
return iRet;
}
//================================================================================================================================
//替代加密算法
private void encrypt_tidai(File fileIn,String sKey)
{
try
{
if(sKey.length() <= 2)
{
int n = Integer.parseInt(sKey);
FileInputStream fis = new FileInputStream(fileIn);
byte[] bytIn = new byte[(int)fileIn.length()];
byte[] bytOut = new byte[(int)fileIn.length()];
for(int i = 0;i<fileIn.length();i++)
{
bytIn[i] = (byte)fis.read();
}
//jiami
for(int i = 0;i<fileIn.length();i++)
bytOut[i] = (byte)(bytIn[i]+n);
String fileOut = fileIn.getPath();// + ".tidai";
FileOutputStream fos = new FileOutputStream(fileOut);
for(int i = 0;i<bytOut.length;i++)
{
fos.write((int)bytOut[i]);
}
fos.close();
JOptionPane.showMessageDialog(this,"替代加密成功！","提示",JOptionPane.OK_OPTION);
}
else
JOptionPane.showMessageDialog(this,"密码长度不正确！","错误信息",JOptionPane.ERROR_MESSAGE);
}
catch(Exception e)
{
e.printStackTrace();
}
}
private void decrypt_kaisa(File fileIn,String sKey)
{
try
{
if(sKey.length() <= 2)
{
String strPath = fileIn.getPath();
if(strPath.substring(strPath.length()-6).toLowerCase().equals(".tidai"))
strPath = strPath.substring(0,strPath.length()-6);
else
{
JOptionPane.showMessageDialog(this,"不是合法的加密文件！","提示",JOptionPane.OK_OPTION);
return;
}
JFileChooser chooser = new JFileChooser();
chooser.setCurrentDirectory(new File(""));
chooser.setSelectedFile(new File(strPath));
//用户指定要保存的文件
int ret = chooser.showSaveDialog(this);
if(ret==JFileChooser.APPROVE_OPTION)
{
int n = Integer.parseInt(sKey);
FileInputStream fis = new FileInputStream(fileIn);
byte[] bytIn = new byte[(int)fileIn.length()];
byte[] bytOut = new byte[(int)fileIn.length()];
for(int i = 0;i<fileIn.length();i++)
{
bytIn[i] = (byte)fis.read();
}
//解密
for(int i = 0;i<fileIn.length();i++)
bytOut[i] = (byte)(bytIn[i]-n);
File fileOut = chooser.getSelectedFile();
fileOut.createNewFile();
FileOutputStream fos = new FileOutputStream(fileOut);
for(int i = 0;i<bytOut.length;i++)
{
fos.write((int)bytOut[i]);
}
fos.close();
JOptionPane.showMessageDialog(this,"解密成功！","提示",JOptionPane.OK_OPTION);
}
}
else
JOptionPane.showMessageDialog(this,"密码长度必须小于等于2！","错误信息",JOptionPane.ERROR_MESSAGE);
}
catch(Exception e)
{
JOptionPane.showMessageDialog(this,"解密失败，请核对密码！","提示",JOptionPane.OK_OPTION);
}
}
private byte[] decryptByKS(byte[] bytE,byte[] bytKey)
{
return bytE;
}
//================================================================================================================================
//主函数
public static void main(String args[])
{
FileEncrypter fe = new FileEncrypter();
}
}⌨️ 快捷键说明
复制代码
Ctrl + C
搜索代码
Ctrl + F
全屏模式
F11
切换主题
Ctrl + Shift + D
显示快捷键
?
增大字号
Ctrl + =
减小字号
Ctrl + -