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java加密解密代码(java 加解密算法)

admin 发布:2022-12-19 08:29 140


本篇文章给大家谈谈java加密解密代码,以及java 加解密算法对应的知识点,希望对各位有所帮助,不要忘了收藏本站喔。

本文目录一览:

谁能提供下java中有关加密和解密的代码

public static void main(String[] args) throws Exception {  

        String data = "itxxz";  

        System.out.println("字符串:itxxz");  

        System.err.println("加密:"+encrypt(data));  

        System.err.println("解密:"+decrypt(encrypt(data)));  

   

    }

运行结果:

由于代码太多,可到  itxxz.com/a/javashili/2014/1217/encrypt_decrypt.html  查看,注释也比较完整,清晰易懂

JAVA 文本文件用异或算法进行加密解密的程序代码!

import java.io.File;

import java.io.FileInputStream;

import java.io.FileOutputStream;

public class XorExample {

public static final byte XOR_CONST = 0X12;

public static void main(String[] args) throws Exception {

File src = new File("level1.txt");

File dest = new File("level2.txt");

File dest2 = new File("level3.txt");

xorEn(src, dest);

xorEn(dest, dest2);

}

/**

* 异或的一个特点: a^b = c c^b = a

* 所以简单点,这里的加解密都用一个函数就行了

* @param src

* @param dest

* @throws Exception

*/

public static void xorEn(File src, File dest) throws Exception {

// 文件不存在或为文件夹就不判断了

FileInputStream fis = new FileInputStream(src);

FileOutputStream fos = new FileOutputStream(dest);

byte[] bs = new byte[1024];

int len = 0;

while ((len = fis.read(bs)) != -1) {

for (int i = 0; i len; i++) {

bs[i] ^= XOR_CONST;

}

fos.write(bs, 0, len);

}

fos.close();

fis.close();

}

}

用java写个文件加密的代码该怎么写

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++){

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;iBYTOUT.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;iFILEIN.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;iBYTOUT.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;iSTR.LENGTH()

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;iBYT.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;

}

}

如何用java实现加密与解密???

通常比较简单的加密方法就是你把文本文件加载读取以后,得到的每一个char加上一个固定的整数,然后再保存,这样内容就看不懂了。

再读取以后,把每一个char减去固定的整数,然后保存,就还原回来了。

这种方法是最最简单的加密方式,不需要使用任何的加密算法。

求java中3des加密解密示例

在java中调用sun公司提供的3DES加密解密算法时,需要使用到$JAVA_HOME/jre/lib/目录下如下的4个jar包:

jce.jar

security/US_export_policy.jar

security/local_policy.jar

ext/sunjce_provider.jar

Java运行时会自动加载这些包,因此对于带main函数的应用程序不需要设置到CLASSPATH环境变量中。对于WEB应用,不需要把这些包加到WEB-INF/lib目录下。

以下是java中调用sun公司提供的3DES加密解密算法的样本代码:

加密解密代码

import java.security.Security;

import javax.crypto.Cipher;

import javax.crypto.SecretKey;

import javax.crypto.spec.SecretKeySpec;

/*字符串 DESede(3DES) 加密*/

public class ThreeDes {

/**

* @param args在java中调用sun公司提供的3DES加密解密算法时,需要使

* 用到$JAVA_HOME/jre/lib/目录下如下的4个jar包:

*jce.jar

*security/US_export_policy.jar

*security/local_policy.jar

*ext/sunjce_provider.jar

*/

private static final String Algorithm ="DESede"; //定义加密算法,可用 DES,DESede,Blowfish

//keybyte为加密密钥,长度为24字节

//src为被加密的数据缓冲区(源)

public static byte[] encryptMode(byte[] keybyte,byte[] src){

try {

//生成密钥

SecretKey deskey = new SecretKeySpec(keybyte, Algorithm);

//加密

Cipher c1 = Cipher.getInstance(Algorithm);

c1.init(Cipher.ENCRYPT_MODE, deskey);

return c1.doFinal(src);//在单一方面的加密或解密

} catch (java.security.NoSuchAlgorithmException e1) {

// TODO: handle exception

e1.printStackTrace();

}catch(javax.crypto.NoSuchPaddingException e2){

e2.printStackTrace();

}catch(java.lang.Exception e3){

e3.printStackTrace();

}

return null;

}

//keybyte为加密密钥,长度为24字节

//src为加密后的缓冲区

public static byte[] decryptMode(byte[] keybyte,byte[] src){

try {

//生成密钥

SecretKey deskey = new SecretKeySpec(keybyte, Algorithm);

//解密

Cipher c1 = Cipher.getInstance(Algorithm);

c1.init(Cipher.DECRYPT_MODE, deskey);

return c1.doFinal(src);

} catch (java.security.NoSuchAlgorithmException e1) {

// TODO: handle exception

e1.printStackTrace();

}catch(javax.crypto.NoSuchPaddingException e2){

e2.printStackTrace();

}catch(java.lang.Exception e3){

e3.printStackTrace();

}

return null;

}

//转换成十六进制字符串

public static String byte2Hex(byte[] b){

String hs="";

String stmp="";

for(int n=0; nb.length; n++){

stmp = (java.lang.Integer.toHexString(b[n] 0XFF));

if(stmp.length()==1){

hs = hs + "0" + stmp;

}else{

hs = hs + stmp;

}

if(nb.length-1)hs=hs+":";

}

return hs.toUpperCase();

}

public static void main(String[] args) {

// TODO Auto-generated method stub

//添加新安全算法,如果用JCE就要把它添加进去

Security.addProvider(new com.sun.crypto.provider.SunJCE());

final byte[] keyBytes = {0x11, 0x22, 0x4F, 0x58,

(byte)0x88, 0x10, 0x40, 0x38, 0x28, 0x25, 0x79,0x51,

(byte)0xCB,

(byte)0xDD, 0x55, 0x66, 0x77, 0x29, 0x74,

(byte)0x98, 0x30, 0x40, 0x36,

(byte)0xE2

}; //24字节的密钥

String szSrc = "This is a 3DES test. 测试";

System.out.println("加密前的字符串:" + szSrc);

byte[] encoded = encryptMode(keyBytes,szSrc.getBytes());

System.out.println("加密后的字符串:" + new String(encoded));

byte[] srcBytes = decryptMode(keyBytes,encoded);

System.out.println("解密后的字符串:" + (new String(srcBytes)));

}

}

java如何用Aes加密和解密

你解密的key必须是加密的key啊

你看看,你解密的时候又KeyGenerator.getInstance("AES").generateKey();这是重新搞了一个key啊,当然解不出来了

我估计你这代码人家原先是写在一起的吧,加密完了再直接解密给你看,人家只generateKey一次,自然很顺利,你分成了两个例子,居然分别generateKey,自然失败

java加密解密代码的介绍就聊到这里吧,感谢你花时间阅读本站内容,更多关于java 加解密算法、java加密解密代码的信息别忘了在本站进行查找喔。

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