package com.cube.limail.util;
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import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;/**
* 加密解密類
*/
public class Eryptogram
{
private static String Algorithm ="DES";
private String key="CB7A92E3D3491964";
//定義 加密算法,可用 DES,DESede,Blowfish
static boolean debug = false ;
/**
* 構(gòu)造子注解.
*/
public Eryptogram ()
{
} /**
* 生成密鑰
* @return byte[] 返回生成的密鑰
* @throws exception 扔出異常.
*/
public static byte [] getSecretKey () throws Exception
{
KeyGenerator keygen = KeyGenerator.getInstance (Algorithm );
SecretKey deskey = keygen.generateKey ();
System.out.println ("生成密鑰:"+bytesToHexString (deskey.getEncoded ()));
if (debug ) System.out.println ("生成密鑰:"+bytesToHexString (deskey.getEncoded ()));
return deskey.getEncoded ();
} /**
* 將指定的數(shù)據(jù)根據(jù)提供的密鑰進(jìn)行加密
* @param input 需要加密的數(shù)據(jù)
* @param key 密鑰
* @return byte[] 加密后的數(shù)據(jù)
* @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 ("加密前的二進(jìn)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 ("加密后的二進(jìn)串:"+byte2hex (cipherByte ));
return cipherByte ;
} /**
* 將給定的已加密的數(shù)據(jù)通過指定的密鑰進(jìn)行解密
* @param input 待解密的數(shù)據(jù)
* @param key 密鑰
* @return byte[] 解密后的數(shù)據(jù)
* @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 ("解密后的二進(jìn)串:"+byte2hex (clearByte ));
System.out.println ("解密后的字符串:"+(new String (clearByte )));
} return clearByte ;
} /**
* 字節(jié)碼轉(zhuǎn)換成16進(jìn)制字符串
* @param byte[] b 輸入要轉(zhuǎn)換的字節(jié)碼
* @return String 返回轉(zhuǎn)換后的16進(jìn)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 ();
}
/**
* 字符串轉(zhuǎn)成字節(jié)數(shù)組.
* @param hex 要轉(zhuǎn)化的字符串.
* @return byte[] 返回轉(zhuǎn)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;
}
/**
* 字節(jié)數(shù)組轉(zhuǎn)成字符串.
* @param String 要轉(zhuǎn)化的字符串.
* @return 返回轉(zhuǎn)化后的字節(jié)數(shù)組.
*/
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();
}
/**
* 從數(shù)據(jù)庫中獲取密鑰.
* @param deptid 企業(yè)id.
* @return 要返回的字節(jié)數(shù)組.
* @throws Exception 可能拋出的異常.
*/
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("密鑰:" + 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); //獲得鑰匙（字節(jié)數(shù)組）
byte[] tmp=Eryptogram.encryptData(password.getBytes(), key); //傳入密碼和鑰匙，獲得加密后的字節(jié)數(shù)組的密碼
password=Eryptogram.bytesToHexString(tmp); //將字節(jié)數(shù)組轉(zhuǎn)化為字符串，獲得加密后的字符串密碼解密與之差不多
很簡(jiǎn)單的題，都不用在控制臺(tái)輸入。
public stat void main (String[] agrs）{
int data = 100;
double result;//先把結(jié)果看成double型，輸出強(qiáng)制轉(zhuǎn)換就OK
result = (data*10+5)/2+3.14159；
System.out.println("加密結(jié)果"+(int)result);
}
}
純手打望采納
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
說明：文件加密
加密方法：三重DES加密
加密過程：對(duì)選中的文件加密后在同文件夾下生成一個(gè)增加了".tdes"
擴(kuò)展名的加密文件
解密過程：對(duì)選中的加密文件（必須有".tdes"擴(kuò)展名）進(jìn)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("文件選擇");
c.add(fp);
final KeyPanel pp = new KeyPanel("密碼");
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,"請(qǐng)選擇文件！","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,"請(qǐng)選擇文件！","提示",JOptionPane.OK_OPTION);
}
});
}
/**
加密函數(shù)
輸入：
要加密的文件，密碼（由0-F組成，共48個(gè)字符，表示3個(gè)8位的密碼）如：
AD67EA2F3BE6E5ADD368DFE03120B5DF92A8FD8FEC2F0746
其中：
AD67EA2F3BE6E5AD DES密碼一
D368DFE03120B5DF DES密碼二
92A8FD8FEC2F0746 DES密碼三
輸出：
對(duì)輸入的文件加密后，保存到同一文件夾下增加了".tdes"擴(kuò)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,"密碼長(zhǎng)度必須等于48！","錯(cuò)誤信息",JOptionPane.ERROR_MESSAGE);
}catch(Exception e){
e.printStackTrace();
}
}
/**
解密函數(shù)
輸入：
要解密的文件，密碼（由0-F組成，共48個(gè)字符，表示3個(gè)8位的密碼）如：
AD67EA2F3BE6E5ADD368DFE03120B5DF92A8FD8FEC2F0746
其中：
AD67EA2F3BE6E5AD DES密碼一
D368DFE03120B5DF DES密碼二
92A8FD8FEC2F0746 DES密碼三
輸出：
對(duì)輸入的文件解密后，保存到用戶指定的文件中。
*/
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));
//用戶指定要保存的文件
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,"密碼長(zhǎng)度必須等于48！","錯(cuò)誤信息",JOptionPane.ERROR_MESSAGE);
}catch(Exception e){
JOptionPane.showMessageDialog(
this,"解密失敗，請(qǐng)核對(duì)密碼！","提示",JOptionPane.OK_OPTION);
}
}
/**
用DES方法加密輸入的字節(jié)
bytKey需為8字節(jié)長(zhǎng)，是加密的密碼
*/
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方法解密輸入的字節(jié)
bytKey需為8字節(jié)長(zhǎng)，是解密的密碼
*/
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);
}
/**
輸入密碼的字符形式，返回字節(jié)數(shù)組形式。
如輸入字符串：AD67EA2F3BE6E5AD
返回字節(jié)數(shù)組：{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;
}
/**
計(jì)算一個(gè)16進(jìn)制字符的10進(jìn)制值
輸入：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;
}
}
/**
文件選擇組件。
*/
class FilePanel extends JPanel{
FilePanel(String str){
JLabel label = new JLabel(str);
JTextField fileText = new JTextField(35);
JButton chooseButton = new JButton("瀏覽...");
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;
}
}
/**
密碼生成組件。
*/
class KeyPanel extends JPanel{
KeyPanel(String str){
JLabel label = new JLabel(str);
JTextField fileText = new JTextField(35);
JButton chooseButton = new JButton("隨機(jī)產(chǎn)生");
this.add(label);
this.add(fileText);
this.add(chooseButton);
clickAction ca = new clickAction(this);
chooseButton.addActionListener(ca);
}
//返回生成的密碼（48個(gè)字符長(zhǎng)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;
}
}
import java.security.*;
import javax.crypto.*;
/**
* 本例解釋如何利用DES私鑰加密算法加解密
*
* @author Devon
* @version 1.0 04/03/10
*/
public class SingleKeyExample {
public static void main(String[] args) {
try {
String algorithm = "DES"; //定義加密算法,可用 DES,DESede,Blowfish
String message = "Hello World. 這是待加密的信息";
// 生成個(gè)DES密鑰
KeyGenerator keyGenerator = KeyGenerator.getInstance(algorithm);
keyGenerator.init(56); //選擇DES算法,密鑰長(zhǎng)度必須為56位
Key key = keyGenerator.generateKey(); //生成密鑰
// 生成Cipher對(duì)象
Cipher cipher = Cipher.getInstance("DES");
//用密鑰加密明文(message),生成密文(cipherText)
cipher.init(Cipher.ENCRYPT_MODE, key); //操作模式為加密(Cipher.ENCRYPT_MODE),key為密鑰
byte[] cipherText = cipher.doFinal(message.getBytes()); //得到加密后的字節(jié)數(shù)組
System.out.println("加密后的信息: " + new String(cipherText));
//用密鑰加密明文(plainText),生成密文(cipherByte)
cipher.init(Cipher.DECRYPT_MODE, key); //操作模式為解密,key為密鑰
byte[] sourceText = cipher.doFinal(cipherText); //獲得解密后字節(jié)數(shù)組
System.out.println("解密后的信息: " + new String(sourceText));
} catch (Exception ex) {
ex.printStackTrace();
}
}
}
/**
* @author Devon
*/
import java.security.*;
import java.security.spec.*;
import javax.crypto.*;
public class PairKeyExample {
public static void main(String argv[]) {
try {
String algorithm = "RSA"; //定義加密算法,可用 DES,DESede,Blowfish
String message = "張三，你好，我是李四";
//產(chǎn)生張三的密鑰對(duì)(keyPairZhang)
KeyPairGenerator keyGeneratorZhang =
KeyPairGenerator.getInstance(algorithm); //指定采用的算法
keyGeneratorZhang.initialize(1024); //指定密鑰長(zhǎng)度為1024位
KeyPair keyPairZhang = keyGeneratorZhang.generateKeyPair(); //產(chǎn)生密鑰對(duì)
System.out.println("生成張三的公鑰對(duì)");
// 張三生成公鑰(publicKeyZhang)并發(fā)送給李四,這里發(fā)送的是公鑰的數(shù)組字節(jié)
byte[] publicKeyZhangEncode = keyPairZhang.getPublic().getEncoded();
//通過網(wǎng)絡(luò)或磁盤等方式,把公鑰編碼傳送給李四
//李四接收到張三編碼后的公鑰,將其解碼
KeyFactory keyFacoryLi = KeyFactory.getInstance(algorithm); //得到KeyFactory對(duì)象
X509EncodedKeySpec x509KeySpec =
new X509EncodedKeySpec(publicKeyZhangEncode); //公鑰采用X.509編碼
PublicKey publicKeyZhang = keyFacoryLi.generatePublic(x509KeySpec); //將公鑰的KeySpec對(duì)象轉(zhuǎn)換為公鑰
System.out.println("李四成功解碼,得到張三的公鑰");
//李四用張三的公鑰加密信息，并發(fā)送給李四
Cipher cipher = Cipher.getInstance("RSA/ECB/PKCS1Padding"); //得到Cipher對(duì)象
cipher.init(Cipher.ENCRYPT_MODE, publicKeyZhang); //用張三的公鑰初始化Cipher對(duì)象
byte[] cipherMessage = cipher.doFinal(message.getBytes()); //得到加密信息
System.out.println("加密后信息：" + new String(cipherMessage));
System.out.println("加密完成，發(fā)送給李四...");
//張三用自己的私鑰解密從李四處收到的信息
cipher.init(Cipher.DECRYPT_MODE, keyPairZhang.getPrivate()); //張三用其私鑰初始化Cipher對(duì)象
byte[] originalMessage = cipher.doFinal(cipherMessage); //得到解密后信息
System.out.println("張三收到信息，解密后為：" + new String(originalMessage));
} catch (Exception ex) {
ex.printStackTrace();
}
}
}
重慶分公司
重慶分公司
