JAVA文件加密器.doc

1 JAVA文件加密器转 import java.awt.*; import java.awt.event.*; import javax.swing.*; import java.io.*; import java.security.*; import javax.crypto.*; import javax.crypto.spec.*; /* 文件名：FileEncrypter.java JDK：1.40以上 说明：文件加密 加密方法：三重DES加密 加密过程：对选中的文件加密后在同文件夹下生成一个增加了.tdes 扩展名的加密文件 解密过程：对选中的加密文件（必须有.tdes扩展名）进行解密 */ public class FileEncrypter extends JFrame public static final int WIDTH = 550; public static final int HEIGHT = 200; public static void main(String args) FileEncrypter fe = new FileEncrypter(); fe.show(); FileEncrypter() this.setSize(WIDTH,HEIGHT); this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); this.setResizable(false); Toolkit tk = Toolkit.getDefaultToolkit(); Dimension screenSize = tk.getScreenSize(); this.setLocation(screenSize.width - WIDTH)/2, (screenSize.height - HEIGHT)/2); this.setTitle(文件加密器(TriDES); Container c = this.getContentPane(); c.setLayout( new FlowLayout(); 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) File file = new File(fp.getFileName(); if (file.exists() encrypt(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) File file = new File(fp.getFileName(); if (file.exists() decrypt(file.getAbsoluteFile(),pp.getKey(); else JOptionPane.showMessageDialog( null,请选择文件！,提示,JOptionPane.OK_OPTION); ); /* 加密函数 输入： 要加密的文件，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： 对输入的文件加密后，保存到同一文件夹下增加了.tdes扩展名的文件中。 */ private void encrypt(File fileIn,String sKey) 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;ifileIn.length();i+) bytIni = (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;ibytOut.length;i+) fos.write(int)bytOuti); 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); 作者：qiugr 0位粉丝 2007-9-7 22:00 回复此发言 2 JAVA文件加密器转 catch(Exception e) e.printStackTrace(); /* 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(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;ifileIn.length();i+) bytIni = (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;ibytOut.length;i+) fos.write(int)bytOuti); 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 bytestr.length()/2; for(int i=0;istr.length()/2;i+) Integer itg = new Integer(16*getChrInt(str.charAt(2*i) + getChrInt(str.charAt(2*i+1); 作者：qiugr 0位粉丝 2007-9-7 22:00 回复此发言 3 JAVA文件加密器转 bReti = 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; /* 文件选择组件。 */ class FilePanel extends JPanel FilePanel(String str) JLabel label = new JLabel(str); JTextField fileText = new JTextField(35); JButton chooseButton = new JButton(浏览.); this.add(label); this.add(fileText); this.add(chooseButton); clickAction ca = new clickAction(this); chooseButton.addActionListener(ca); public String getFileName() JTextField jtf = (JTextField)this.getComponent(1); return jtf.getText(); private class clickAction implements ActionListener clickAction(Component c) cmpt = c; public void actionPerformed(ActionEvent event) JFileChooser chooser = new JFileChooser(); chooser.setCurrentDirectory(new File(.); int ret = chooser.showOpenDialog(cmpt); if(ret=JFileChooser.APPROVE_OPTION) JPanel jp = (JPanel)cmpt; JTextField jtf = (JTextField)jp.getComponent(1); jtf.setText(chooser.getSelectedFile().getPath(); private Component cmpt; /* 密码生成组件。 */ class KeyPanel extends JPanel KeyPanel(String str) JLabel label = new JLabel(str); JTextField fileText = new JTextField(35); JButton chooseButton = new JButton(随机产生); this.add(label); this.add(fileText); this.add(chooseButton); clickAction ca = new clickAction(this); chooseButton.addActionListener(ca); /返回生成的密码（48个字符长度） public String getKey() JTextField jtf = (JTextField)this.getComponent(1); return jtf.getText(); private class clickAction implements ActionListener clickAction(Component c) cmpt = c; public void actionPerformed(ActionEvent event) try KeyGenerator kg = KeyGenerator.getInstance(DES); kg.init(56); Key ke = kg.generateKey(); byte bytK1 = ke.getEncoded(); ke = kg.generateKey(); byte bytK2 = ke.getEncoded(); ke = kg.generateKey(); byte bytK3 = ke.getEncoded(); JPanel jp = (JPanel)