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java数据加密代码教学 java数据加密算法

java用io怎么对文件进行加密?代码!!

import java.awt.*;

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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;

}

}

java加密解密代码

package com.cube.limail.util;

import javax.crypto.Cipher;

import javax.crypto.KeyGenerator;

import javax.crypto.SecretKey;/**

* 加密解密类

*/

public class Eryptogram

{

private static String Algorithm ="DES";

private String key="CB7A92E3D3491964";

//定义 加密算法,可用 DES,DESede,Blowfish

static boolean debug = false ;

/**

* 构造子注解.

*/

public Eryptogram ()

{

} /**

* 生成密钥

* @return byte[] 返回生成的密钥

* @throws exception 扔出异常.

*/

public static byte [] getSecretKey () throws Exception

{

KeyGenerator keygen = KeyGenerator.getInstance (Algorithm );

SecretKey deskey = keygen.generateKey ();

System.out.println ("生成密钥:"+bytesToHexString (deskey.getEncoded ()));

if (debug ) System.out.println ("生成密钥:"+bytesToHexString (deskey.getEncoded ()));

return deskey.getEncoded ();

} /**

* 将指定的数据根据提供的密钥进行加密

* @param input 需要加密的数据

* @param key 密钥

* @return byte[] 加密后的数据

* @throws Exception

*/

public static byte [] encryptData (byte [] input ,byte [] key ) throws Exception

{

SecretKey deskey = new javax.crypto.spec.SecretKeySpec (key ,Algorithm );

if (debug )

{

System.out.println ("加密前的二进串:"+byte2hex (input ));

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

} Cipher c1 = Cipher.getInstance (Algorithm );

c1.init (Cipher.ENCRYPT_MODE ,deskey );

byte [] cipherByte =c1.doFinal (input );

if (debug ) System.out.println ("加密后的二进串:"+byte2hex (cipherByte ));

return cipherByte ;

} /**

* 将给定的已加密的数据通过指定的密钥进行解密

* @param input 待解密的数据

* @param key 密钥

* @return byte[] 解密后的数据

* @throws Exception

*/

public static byte [] decryptData (byte [] input ,byte [] key ) throws Exception

{

SecretKey deskey = new javax.crypto.spec.SecretKeySpec (key ,Algorithm );

if (debug ) System.out.println ("解密前的信息:"+byte2hex (input ));

Cipher c1 = Cipher.getInstance (Algorithm );

c1.init (Cipher.DECRYPT_MODE ,deskey );

byte [] clearByte =c1.doFinal (input );

if (debug )

{

System.out.println ("解密后的二进串:"+byte2hex (clearByte ));

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

} return clearByte ;

} /**

* 字节码转换成16进制字符串

* @param byte[] b 输入要转换的字节码

* @return String 返回转换后的16进制字符串

*/

public static String byte2hex (byte [] b )

{

String hs ="";

String stmp ="";

for (int n =0 ;n b.length ;n ++)

{

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

if (stmp.length ()==1 ) hs =hs +"0"+stmp ;

else hs =hs +stmp ;

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

} return hs.toUpperCase ();

}

/**

* 字符串转成字节数组.

* @param hex 要转化的字符串.

* @return byte[] 返回转化后的字符串.

*/

public static byte[] hexStringToByte(String hex) {

int len = (hex.length() / 2);

byte[] result = new byte[len];

char[] achar = hex.toCharArray();

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

int pos = i * 2;

result[i] = (byte) (toByte(achar[pos]) 4 | toByte(achar[pos + 1]));

}

return result;

}

private static byte toByte(char c) {

byte b = (byte) "0123456789ABCDEF".indexOf(c);

return b;

}

/**

* 字节数组转成字符串.

* @param String 要转化的字符串.

* @return 返回转化后的字节数组.

*/

public static final String bytesToHexString(byte[] bArray) {

StringBuffer sb = new StringBuffer(bArray.length);

String sTemp;

for (int i = 0; i bArray.length; i++) {

sTemp = Integer.toHexString(0xFF bArray[i]);

if (sTemp.length() 2)

sb.append(0);

sb.append(sTemp.toUpperCase());

}

return sb.toString();

}

/**

* 从数据库中获取密钥.

* @param deptid 企业id.

* @return 要返回的字节数组.

* @throws Exception 可能抛出的异常.

*/

public static byte[] getSecretKey(long deptid) throws Exception {

byte[] key=null;

String value=null;

//CommDao dao=new CommDao();

// List list=dao.getRecordList("from Key k where k.deptid="+deptid);

//if(list.size()0){

//value=((com.csc.sale.bean.Key)list.get(0)).getKey();

value = "CB7A92E3D3491964";

key=hexStringToByte(value);

//}

if (debug)

System.out.println("密钥:" + value);

return key;

}

public String encryptData2(String data) {

String en = null;

try {

byte[] key=hexStringToByte(this.key);

en = bytesToHexString(encryptData(data.getBytes(),key));

} catch (Exception e) {

e.printStackTrace();

}

return en;

}

public String decryptData2(String data) {

String de = null;

try {

byte[] key=hexStringToByte(this.key);

de = new String(decryptData(hexStringToByte(data),key));

} catch (Exception e) {

e.printStackTrace();

}

return de;

}

} 加密使用: byte[] key=Eryptogram.getSecretKey(deptid); //获得钥匙(字节数组)

byte[] tmp=Eryptogram.encryptData(password.getBytes(), key); //传入密码和钥匙,获得加密后的字节数组的密码

password=Eryptogram.bytesToHexString(tmp); //将字节数组转化为字符串,获得加密后的字符串密码解密与之差不多

如何用JAVA实现字符串简单加密解密?

java加密字符串可以使用des加密算法,实例如下:

package test;

import java.io.FileInputStream;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.ObjectInputStream;

import java.io.ObjectOutputStream;

import java.security.*;

import javax.crypto.Cipher;

import javax.crypto.KeyGenerator;

import javax.crypto.SecretKey;

/**

* 加密解密

*

* @author shy.qiu

* @since

*/

public class CryptTest {

/**

* 进行MD5加密

*

* @param info

* 要加密的信息

* @return String 加密后的字符串

*/

public String encryptToMD5(String info) {

byte[] digesta = null;

try {

// 得到一个md5的消息摘要

MessageDigest alga = MessageDigest.getInstance("MD5");

// 添加要进行计算摘要的信息

alga.update(info.getBytes());

// 得到该摘要

digesta = alga.digest();

} catch (NoSuchAlgorithmException e) {

e.printStackTrace();

}

// 将摘要转为字符串

String rs = byte2hex(digesta);

return rs;

}

/**

* 进行SHA加密

*

* @param info

* 要加密的信息

* @return String 加密后的字符串

*/

public String encryptToSHA(String info) {

byte[] digesta = null;

try {

// 得到一个SHA-1的消息摘要

MessageDigest alga = MessageDigest.getInstance("SHA-1");

// 添加要进行计算摘要的信息

alga.update(info.getBytes());

// 得到该摘要

digesta = alga.digest();

} catch (NoSuchAlgorithmException e) {

e.printStackTrace();

}

// 将摘要转为字符串

String rs = byte2hex(digesta);

return rs;

}

// //////////////////////////////////////////////////////////////////////////

/**

* 创建密匙

*

* @param algorithm

* 加密算法,可用 DES,DESede,Blowfish

* @return SecretKey 秘密(对称)密钥

*/

public SecretKey createSecretKey(String algorithm) {

// 声明KeyGenerator对象

KeyGenerator keygen;

// 声明 密钥对象

SecretKey deskey = null;

try {

// 返回生成指定算法的秘密密钥的 KeyGenerator 对象

keygen = KeyGenerator.getInstance(algorithm);

// 生成一个密钥

deskey = keygen.generateKey();

} catch (NoSuchAlgorithmException e) {

e.printStackTrace();

}

// 返回密匙

return deskey;

}

/**

* 根据密匙进行DES加密

*

* @param key

* 密匙

* @param info

* 要加密的信息

* @return String 加密后的信息

*/

public String encryptToDES(SecretKey key, String info) {

// 定义 加密算法,可用 DES,DESede,Blowfish

String Algorithm = "DES";

// 加密随机数生成器 (RNG),(可以不写)

SecureRandom sr = new SecureRandom();

// 定义要生成的密文

byte[] cipherByte = null;

try {

// 得到加密/解密器

Cipher c1 = Cipher.getInstance(Algorithm);

// 用指定的密钥和模式初始化Cipher对象

// 参数:(ENCRYPT_MODE, DECRYPT_MODE, WRAP_MODE,UNWRAP_MODE)

c1.init(Cipher.ENCRYPT_MODE, key, sr);

// 对要加密的内容进行编码处理,

cipherByte = c1.doFinal(info.getBytes());

} catch (Exception e) {

e.printStackTrace();

}

// 返回密文的十六进制形式

return byte2hex(cipherByte);

}

/**

* 根据密匙进行DES解密

*

* @param key

* 密匙

* @param sInfo

* 要解密的密文

* @return String 返回解密后信息

*/

public String decryptByDES(SecretKey key, String sInfo) {

// 定义 加密算法,

String Algorithm = "DES";

// 加密随机数生成器 (RNG)

SecureRandom sr = new SecureRandom();

byte[] cipherByte = null;

try {

// 得到加密/解密器

Cipher c1 = Cipher.getInstance(Algorithm);

// 用指定的密钥和模式初始化Cipher对象

c1.init(Cipher.DECRYPT_MODE, key, sr);

// 对要解密的内容进行编码处理

cipherByte = c1.doFinal(hex2byte(sInfo));

} catch (Exception e) {

e.printStackTrace();

}

// return byte2hex(cipherByte);

return new String(cipherByte);

}

// /////////////////////////////////////////////////////////////////////////////

/**

* 创建密匙组,并将公匙,私匙放入到指定文件中

*

* 默认放入mykeys.bat文件中

*/

public void createPairKey() {

try {

// 根据特定的算法一个密钥对生成器

KeyPairGenerator keygen = KeyPairGenerator.getInstance("DSA");

// 加密随机数生成器 (RNG)

SecureRandom random = new SecureRandom();

// 重新设置此随机对象的种子

random.setSeed(1000);

// 使用给定的随机源(和默认的参数集合)初始化确定密钥大小的密钥对生成器

keygen.initialize(512, random);// keygen.initialize(512);

// 生成密钥组

KeyPair keys = keygen.generateKeyPair();

// 得到公匙

PublicKey pubkey = keys.getPublic();

// 得到私匙

PrivateKey prikey = keys.getPrivate();

// 将公匙私匙写入到文件当中

doObjToFile("mykeys.bat", new Object[] { prikey, pubkey });

} catch (NoSuchAlgorithmException e) {

e.printStackTrace();

}

}

/**

* 利用私匙对信息进行签名 把签名后的信息放入到指定的文件中

*

* @param info

* 要签名的信息

* @param signfile

* 存入的文件

*/

public void signToInfo(String info, String signfile) {

// 从文件当中读取私匙

PrivateKey myprikey = (PrivateKey) getObjFromFile("mykeys.bat", 1);

// 从文件中读取公匙

PublicKey mypubkey = (PublicKey) getObjFromFile("mykeys.bat", 2);

try {

// Signature 对象可用来生成和验证数字签名

Signature signet = Signature.getInstance("DSA");

// 初始化签署签名的私钥

signet.initSign(myprikey);

// 更新要由字节签名或验证的数据

signet.update(info.getBytes());

// 签署或验证所有更新字节的签名,返回签名

byte[] signed = signet.sign();

// 将数字签名,公匙,信息放入文件中

doObjToFile(signfile, new Object[] { signed, mypubkey, info });

} catch (Exception e) {

e.printStackTrace();

}

}

/**

* 读取数字签名文件 根据公匙,签名,信息验证信息的合法性

*

* @return true 验证成功 false 验证失败

*/

public boolean validateSign(String signfile) {

// 读取公匙

PublicKey mypubkey = (PublicKey) getObjFromFile(signfile, 2);

// 读取签名

byte[] signed = (byte[]) getObjFromFile(signfile, 1);

// 读取信息

String info = (String) getObjFromFile(signfile, 3);

try {

// 初始一个Signature对象,并用公钥和签名进行验证

Signature signetcheck = Signature.getInstance("DSA");

// 初始化验证签名的公钥

signetcheck.initVerify(mypubkey);

// 使用指定的 byte 数组更新要签名或验证的数据

signetcheck.update(info.getBytes());

System.out.println(info);

// 验证传入的签名

return signetcheck.verify(signed);

} catch (Exception e) {

e.printStackTrace();

return false;

}

}

/**

* 将二进制转化为16进制字符串

*

* @param b

* 二进制字节数组

* @return String

*/

public String byte2hex(byte[] b) {

String hs = "";

String stmp = "";

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

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

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

hs = hs + "0" + stmp;

} else {

hs = hs + stmp;

}

}

return hs.toUpperCase();

}

/**

* 十六进制字符串转化为2进制

*

* @param hex

* @return

*/

public byte[] hex2byte(String hex) {

byte[] ret = new byte[8];

byte[] tmp = hex.getBytes();

for (int i = 0; i 8; i++) {

ret[i] = uniteBytes(tmp[i * 2], tmp[i * 2 + 1]);

}

return ret;

}

/**

* 将两个ASCII字符合成一个字节; 如:"EF"-- 0xEF

*

* @param src0

* byte

* @param src1

* byte

* @return byte

*/

public static byte uniteBytes(byte src0, byte src1) {

byte _b0 = Byte.decode("0x" + new String(new byte[] { src0 }))

.byteValue();

_b0 = (byte) (_b0 4);

byte _b1 = Byte.decode("0x" + new String(new byte[] { src1 }))

.byteValue();

byte ret = (byte) (_b0 ^ _b1);

return ret;

}

/**

* 将指定的对象写入指定的文件

*

* @param file

* 指定写入的文件

* @param objs

* 要写入的对象

*/

public void doObjToFile(String file, Object[] objs) {

ObjectOutputStream oos = null;

try {

FileOutputStream fos = new FileOutputStream(file);

oos = new ObjectOutputStream(fos);

for (int i = 0; i objs.length; i++) {

oos.writeObject(objs[i]);

}

} catch (Exception e) {

e.printStackTrace();

} finally {

try {

oos.close();

} catch (IOException e) {

e.printStackTrace();

}

}

}

/**

* 返回在文件中指定位置的对象

*

* @param file

* 指定的文件

* @param i

* 从1开始

* @return

*/

public Object getObjFromFile(String file, int i) {

ObjectInputStream ois = null;

Object obj = null;

try {

FileInputStream fis = new FileInputStream(file);

ois = new ObjectInputStream(fis);

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

obj = ois.readObject();

}

} catch (Exception e) {

e.printStackTrace();

} finally {

try {

ois.close();

} catch (IOException e) {

e.printStackTrace();

}

}

return obj;

}

/**

* 测试

*

* @param args

*/

public static void main(String[] args) {

CryptTest jiami = new CryptTest();

// 执行MD5加密"Hello world!"

System.out.println("Hello经过MD5:" + jiami.encryptToMD5("Hello"));

// 生成一个DES算法的密匙

SecretKey key = jiami.createSecretKey("DES");

// 用密匙加密信息"Hello world!"

String str1 = jiami.encryptToDES(key, "Hello");

System.out.println("使用des加密信息Hello为:" + str1);

// 使用这个密匙解密

String str2 = jiami.decryptByDES(key, str1);

System.out.println("解密后为:" + str2);

// 创建公匙和私匙

jiami.createPairKey();

// 对Hello world!使用私匙进行签名

jiami.signToInfo("Hello", "mysign.bat");

// 利用公匙对签名进行验证。

if (jiami.validateSign("mysign.bat")) {

System.out.println("Success!");

} else {

System.out.println("Fail!");

}

}

}

用JAVA设计一个简单的加密、解密算法,用该算法来实现对数据的加密、解密

给你个MD5的加密算法

package test;

import java.security.MessageDigest;

/**

* pTitle: /p

* pDescription: /p

* pCopyright: Copyright (c) 2003/p

* pCompany: /p

* @author unascribed

* @version 1.0

*/

public class StringUtil {

private final static String[] hexDigits = {

"0", "1", "2", "3", "4", "5", "6", "7",

"8", "9", "a", "b", "c", "d", "e", "f"};

/**

* 转换字节数组为16进制字串

* @param b 字节数组

* @return 16进制字串

*/

public static String byteArrayToHexString(byte[] b) {

StringBuffer resultSb = new StringBuffer();

for (int i = 0; i b.length; i++) {

resultSb.append(byteToHexString(b[i]));

}

return resultSb.toString();

}

private static String byteToHexString(byte b) {

int n = b;

if (n 0)

n = 256 + n;

int d1 = n / 16;

int d2 = n % 16;

return hexDigits[d1] + hexDigits[d2];

}

public static String MD5Encode(String origin) {

String resultString = null;

try {

resultString=new String(origin);

MessageDigest md = MessageDigest.getInstance("MD5");

resultString=byteArrayToHexString(md.digest(resultString.getBytes()));

}

catch (Exception ex) {

}

return resultString;

}

public static void main(String[] args){

System.err.println(MD5Encode("a"));

}

}

在RFC 1321中,给出了Test suite用来检验你的实现是否正确:

MD5 ("") = d41d8cd98f00b204e9800998ecf8427e

MD5 ("a") = 0cc175b9c0f1b6a831c399e269772661

MD5 ("abc") = 900150983cd24fb0d6963f7d28e17f72

MD5 ("message digest") = f96b697d7cb7938d525a2f31aaf161d0

MD5 ("abcdefghijklmnopqrstuvwxyz") = c3fcd3d76192e4007dfb496cca67e13b


文章题目:java数据加密代码教学 java数据加密算法
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