android平台上的加密程序源代码

[liujuhero]

哪位朋友能够不吝赐教一个个android平台上的加密程序啊，就是加密文件的那种，小弟在这里先行谢过了！献上全部分值！

[妖怪]

你想用什么方式加密？
MD5？ 还是？

[ameyume]

java上的加密算法就可以吧？
应该很多这种程序

[woshayawo]

package day20.editor;

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.io.*;

public class FileEncrypt {
public static void main(String[] args) {
new FileEncryptFrame().init();
}
}


class FileEncryptFrame extends JFrame{
JPanel jp1;
JPanel jp2;
JLabel jlb1;
JLabel jlb2;
JFileChooser jfc;
JCheckBox jcb;
JTextField jtf;
JButton jb1;
JButton jb2;
JProgressBar jpb;
class RefreshProgressBarThread extends Thread{
public RefreshProgressBarThread(){

}

public void run(){

}
}
public FileEncryptFrame(){
super("文件加密/解密器 v1.0");
jp1=new JPanel();
jp2=new JPanel();
jlb1=new JLabel("选择要加密/解密的文件：");
jlb2=new JLabel("选择加密/解密算子（0-255）：");
jfc=new JFileChooser();
jtf=new JTextField(10);
jcb=new JCheckBox("覆盖原文件");
jb1=new JButton("加密/解密");
jb2=new JButton("取消");
jpb=new JProgressBar();
jpb.setStringPainted(true);
}

public void init(){
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE );
this.setLayout(new BorderLayout());
this.add(jp1,BorderLayout.CENTER);
this.add(jp2,BorderLayout.SOUTH);

jp1.setAlignmentX(JPanel.LEFT_ALIGNMENT);
jp1.setLayout(new FlowLayout(FlowLayout.LEFT));
jfc.setControlButtonsAreShown(false);
jp1.add(jlb1);
jp1.add(jfc);
jp1.add(jlb2);
jp1.add(jtf);
jp1.add(jcb);
jp1.add(jpb);

jp2.add(jb1);
jp2.add(jb2);

setVisible(true);
setSize(520,480);
this.setResizable(false);
setEvent();
}
public void setEvent(){
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
jb1.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
File f=jfc.getSelectedFile();
int code=Integer.parseInt(jtf.getText());
new Encrypter(code,f,jcb.isSelected()).encode();
final JDialog jd=new JDialog(FileEncryptFrame.this,"加密成功！");
jd.add(new JLabel("文件加密成功！"),BorderLayout.NORTH);
JButton jbok;
jd.add(jbok=new JButton("确定"),BorderLayout.SOUTH);
jbok.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
jd.dispose();
}
});
jd.setLocationRelativeTo(FileEncryptFrame.this);
jd.setSize(300,200);
jd.setVisible(true);
}
});

jb2.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
System.exit(0);}
});
}
}

class Encrypter{
int code;
boolean rewrite;
File sourceFile;
FileInputStream fin;
FileOutputStream fout;
String sourceFileName;
String objFileName;

public Encrypter(int c,File file,boolean rewrite)
{ code=c;
sourceFile=file;
this.rewrite=rewrite;
sourceFileName=sourceFile.getAbsolutePath();
System.out.print(sourceFileName);
int indexOfDot=sourceFileName.lastIndexOf('.');
System.out.print(indexOfDot);
if(indexOfDot==-1){//如果原文件名不包含扩展名
objFileName=sourceFileName+".sec";
}else {//如果原文件名包含扩展名
String postfixName=sourceFileName.substring(indexOfDot);
if(postfixName.equals(".sec")){//如果扩展名是.sec
objFileName=sourceFileName.substring(0,indexOfDot);
}else{
objFileName=sourceFileName+".sec";
}
}
}
public void encode(){
if(rewrite){//覆盖原文件
RandomAccessFile fra=null;
try {
fra=new RandomAccessFile(sourceFile,"rw");
int temp;
while((temp=fra.read())!=-1){
fra.seek(fra.getFilePointer()-1);
fra.write(temp^code);
}
//System.out.println(objFileName);
//System.out.println(sourceFile.renameTo(new File("objFileName")));
} catch (Exception e) {
e.printStackTrace();
}finally{
if(fra!=null)try{fra.close();}catch(IOException e){}
}
}else{//不覆盖原文件
FileInputStream fis=null;
FileOutputStream fos=null;
try {
fis=new FileInputStream(sourceFile);
fos=new FileOutputStream(objFileName);
while(fis.available()>0){
fos.write(fis.read()^code);
}
fos.flush();
} catch (Exception e) {
e.printStackTrace();
}finally{
if(fis!=null)try{fis.close();}catch(IOException e){}
if(fos!=null)try{fos.close();}catch(IOException e){}
}
}

}
}

[juanmaolang001]

解密呢。。。
[Quote=引用 3 楼 woshayawo 的回复:]
package day20.editor;

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.io.*;

public class FileEncrypt {
public static void main(String[] args) {
new FileEncr……
[/Quote]