会python真的可以为所欲为0(回)
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这里还有人吗1(回)
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550天前
每天面对着电脑屏幕，敲打键盘。我所面对的并不只是代码，而是一种生活方式。0(回)
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855天前
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859天前import java.awt.*; |
import java.awt.event.*; |
import javax.swing.*; |
import java.io.*; |
import java.security.*; |
import javax.crypto.*; |
import javax.crypto.spec.*; |
/** |
* 文本文件加密解密类 |
* |
* 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 Test extends JFrame |
{ |
public static final int WIDTH = 550; |
public static final int HEIGHT = 200; |
public static void main ( String args[] ) |
{ |
Test fe = new Test(); |
fe.show(); |
} |
Test() |
{ |
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; 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(); |
} |
} |
/** |
* 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; 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; |
} |
} |
/** |
* 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 ) cmpt; |
JTextField jtf = ( JTextField ) jp.getComponent ( 1 ); |
jtf.setText ( getByteStr ( bytK1 ) + getByteStr ( bytK2 ) |
+ getByteStr ( bytK3 ) ); |
} |
catch ( Exception e ) |
{ |
e.printStackTrace(); |
} |
} |
private String getByteStr ( byte[] byt ) |
{ |
String strRet = ""; |
for ( int i = 0; i < byt.length; i++ ) |
{ |
// System.out.println(byt[i]); |
strRet += getHexValue ( ( byt[i] & 240 ) / 16 ); |
strRet += getHexValue ( byt[i] & 15 ); |
} |
return strRet; |
} |
private String getHexValue ( int s ) |
{ |
String sRet = null; |
switch ( s ) |
{ |
case 0: |
sRet = "0"; |
break; |
case 1: |
sRet = "1"; |
break; |
case 2: |
sRet = "2"; |
break; |
case 3: |
sRet = "3"; |
break; |
case 4: |
sRet = "4"; |
break; |
case 5: |
sRet = "5"; |
break; |
case 6: |
sRet = "6"; |
break; |
case 7: |
sRet = "7"; |
break; |
case 8: |
sRet = "8"; |
break; |
case 9: |
sRet = "9"; |
break; |
case 10: |
sRet = "A"; |
break; |
case 11: |
sRet = "B"; |
break; |
case 12: |
sRet = "C"; |
break; |
case 13: |
sRet = "D"; |
break; |
case 14: |
sRet = "E"; |
break; |
case 15: |
sRet = "F"; |
} |
return sRet; |
} |
private Component cmpt; |
} |
} |
