java实现des加密算法

❶ 如何用java进行3DES加密解密

这里是例子，直接拿来用就可以了。
package com.nnff.des;

import java.security.Security;

import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;

/*字符串 DESede(3DES) 加密
* ECB模式/使用PKCS7方式填充不足位,目前给的密钥是192位
* 3DES（即Triple DES）是DES向AES过渡的加密算法（1999年，NIST将3-DES指定为过渡的
* 加密标准），是DES的一个更安全的变形。它以DES为基本模块，通过组合分组方法设计出分组加
* 密算法，其具体实现如下：设Ek()和Dk()代表DES算法的加密和解密过程，K代表DES算法使用的
* 密钥，P代表明文，C代表密表，这样，
* 3DES加密过程为：C=Ek3(Dk2(Ek1(P)))
* 3DES解密过程为：P=Dk1((EK2(Dk3(C)))
* */
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; 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();
}
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)));
}
}

❷ 用java实现DES加密算法，细致点，要直接粘贴进平台能运行的！！

/*des密钥生成代码*/
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectOutputStream;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import java.security.spec.InvalidKeySpecException;

import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;

import com.huateng.util.common.Log;

public class GenKey {

private static final String DES = "DES";
public static final String SKEY_NAME = "key.des";

public static void genKey1(String path) {

// 密钥
SecretKey skey = null;
// 密钥随机数生成
SecureRandom sr = new SecureRandom();
//生成密钥文件
File file = genFile(path);

try {
// 获取密钥生成实例
KeyGenerator gen = KeyGenerator.getInstance(DES);
// 初始化密钥生成器
gen.init(sr);
// 生成密钥
skey = gen.generateKey();
// System.out.println(skey);

ObjectOutputStream oos = new ObjectOutputStream(
new FileOutputStream(file));
oos.writeObject(skey);
oos.close();
Log.sKeyPath(path);
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}

/**
* @param file ： 生成密钥的路径
* SecretKeyFactory 方式生成des密钥
* */
public static void genKey2(String path) {
// 密钥随机数生成
SecureRandom sr = new SecureRandom();
// byte[] bytes = {11,12,44,99,76,45,1,8};
byte[] bytes = sr.generateSeed(20);
// 密钥
SecretKey skey = null;
//生成密钥文件路径
File file = genFile(path);

try {
//创建deskeyspec对象
DESKeySpec desKeySpec = new DESKeySpec(bytes,9);
//实例化des密钥工厂
SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(DES);
//生成密钥对象
skey = keyFactory.generateSecret(desKeySpec);
//写出密钥对象
ObjectOutputStream oos = new ObjectOutputStream(
new FileOutputStream(file));
oos.writeObject(skey);
oos.close();
Log.sKeyPath(path);
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
} catch (InvalidKeyException e) {
e.printStackTrace();
} catch (InvalidKeySpecException e) {
e.printStackTrace();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}

}

private static File genFile(String path) {
String temp = null;
File newFile = null;
if (path.endsWith("/") || path.endsWith("\\")) {
temp = path;
} else {
temp = path + "/";
}

File pathFile = new File(temp);
if (!pathFile.exists())
pathFile.mkdirs();

newFile = new File(temp+SKEY_NAME);

return newFile;
}
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
genKey2("E:/a/aa/");
}

}
/*加解密*/
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.ObjectInputStream;

import javax.crypto.Cipher;
import javax.crypto.CipherInputStream;
import javax.crypto.SecretKey;
public class SecUtil {
public static void decrypt(String keyPath, String source, String dest) {
SecretKey key = null;
try

{
ObjectInputStream keyFile = new ObjectInputStream(
//读取加密密钥
new FileInputStream(keyPath));
key = (SecretKey) keyFile.readObject();
keyFile.close();
}
catch (FileNotFoundException ey1) {

throw new RuntimeException(ey1);
}
catch (Exception ey2) {
throw new RuntimeException(ey2);
}
//用key产生Cipher
Cipher cipher = null;
try {
//设置算法,应该与加密时的设置一样
cipher = Cipher.getInstance("DES");
//设置解密模式
cipher.init(Cipher.DECRYPT_MODE, key);
}
catch (Exception ey3) {
throw new RuntimeException(ey3);
}
//取得要解密的文件并解密
File file = new File(source);
String filename = file.getName();
try {
//输出流,请注意文件名称的获取
BufferedOutputStream out = new BufferedOutputStream(new FileOutputStream(dest));
//输入流
CipherInputStream in = new CipherInputStream(new BufferedInputStream(
new FileInputStream(file)), cipher);
int thebyte = 0;
while ( (thebyte = in.read()) != -1) {
out.write(thebyte);
}
in.close();
out.close();
}
catch (Exception ey5) {
throw new RuntimeException(ey5);
}
}

public static void encrypt(String keyPath, String source, String dest) {
SecretKey key = null;
try

{
ObjectInputStream keyFile = new ObjectInputStream(
//读取加密密钥
new FileInputStream(keyPath));
key = (SecretKey) keyFile.readObject();
keyFile.close();
}
catch (FileNotFoundException ey1) {
throw new RuntimeException(ey1);
}
catch (Exception ey2) {
throw new RuntimeException(ey2);
}
//用key产生Cipher
Cipher cipher = null;
try {
//设置算法,应该与加密时的设置一样
cipher = Cipher.getInstance("DES");
//设置解密模式
cipher.init(Cipher.ENCRYPT_MODE, key);
}
catch (Exception ey3) {
throw new RuntimeException(ey3);
}
//取得要解密的文件并解密
File file = new File(source);
String filename = file.getName();
try {
//输出流,请注意文件名称的获取
BufferedOutputStream out = new BufferedOutputStream(new FileOutputStream(dest));
//输入流
CipherInputStream in = new CipherInputStream(new BufferedInputStream(
new FileInputStream(file)), cipher);
int thebyte = 0;
while ( (thebyte = in.read()) != -1) {
out.write(thebyte);
}
in.close();
out.close();
}
catch (Exception ey5) {
throw new RuntimeException(ey5);
}
}
}

❸ 用java实现des算法

分类: 电脑/网络 >> 程序设计 >> 其他编程语言
问题描述:

各位好，请求各位java学习者帮助钉解决这个问题。

我想用des算法对我的名字进行加密

我也在网上下载了des算法，包括FileDES,SubKey,Des各程序，

可能没真正理解这些程序，所以我想调用都不知道将这些东西

组合起来，有知道的请帮帮忙啊！

解析:

package des;

import java.io.*;

import java.nio.*;

import java.nio.channels.FileChannel;

public class FileDES{

private static final boolean enc=true; 加密

private static final boolean dec=false; 解密

private String srcFileName;

private String destFileName;

private String inKey;

private boolean actionType;

private File srcFile;

private File destFile;

private Des des;

private void *** yzePath(){

String dirName;

int pos=srcFileNamestIndexOf("/");

dirName=srcFileName.substring(0,pos);

File dir=new File(dirName);

if (!dir.exists()){

System.err.println(dirName+" is not exist");

System.exit(1);

}else if(!dir.isDirectory()){

System.err.println(dirName+" is not a directory");

System.exit(1);

}

pos=destFileNamestIndexOf("/");

dirName=destFileName.substring(0,pos);

dir=new File(dirName);

if (!dir.exists()){

if(!dir.mkdirs()){

System.out.println ("can not creat directory:"+dirName);

System.exit(1);

}

}else if(!dir.isDirectory()){

System.err.println(dirName+" is not a directory");

System.exit(1);

}

}

private static int replenish(FileChannel channel,ByteBuffer buf) throws IOException{

long byteLeft=channel.size()-channel.position();

if(byteLeft==0L)

return -1;

buf.position(0);

buf.limit(buf.position()+(byteLeft<8 ? (int)byteLeft :8));

return channel.read(buf);

}

private void file_operate(boolean flag){

des=new Des(inKey);

FileOutputStream outputFile=null;

try {

outputFile=new FileOutputStream(srcFile,true);

}catch (java.io.FileNotFoundException e) {

e.printStackTrace(System.err);

}

FileChannel outChannel=outputFile.getChannel();

try{

if(outChannel.size()%2!=0){

ByteBuffer bufTemp=ByteBuffer.allocate(1);

bufTemp.put((byte)32);

bufTemp.flip();

outChannel.position(outChannel.size());

outChannel.write(bufTemp);

bufTemp.clear();

}

}catch(Exception ex){

ex.printStackTrace(System.err);

System.exit(1);

}

FileInputStream inFile=null;

try{

inFile=new FileInputStream(srcFile);

}catch(java.io.FileNotFoundException e){

e.printStackTrace(System.err);

System.exit(1);

}

outputFile=null;

try {

outputFile=new FileOutputStream(destFile,true);

}catch (java.io.FileNotFoundException e) {

e.printStackTrace(System.err);

}

FileChannel inChannel=inFile.getChannel();

outChannel=outputFile.getChannel();

ByteBuffer inBuf=ByteBuffer.allocate(8);

ByteBuffer outBuf=ByteBuffer.allocate(8);

try{

String srcStr;

String destStr;

while(true){

if (replenish(inChannel,inBuf)==-1) break;

srcStr=((ByteBuffer)(inBuf.flip())).asCharBuffer().toString();

inBuf.clear();

if (flag)

destStr=des.enc(srcStr,srcStr.length());

else

destStr=des.dec(srcStr,srcStr.length());

outBuf.clear();

if (destStr.length()==4){

for (int i = 0; i<4; i++) {

outBuf.putChar(destStr.charAt(i));

}

outBuf.flip();

}else{

outBuf.position(0);

outBuf.limit(2*destStr.length());

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

outBuf.putChar(destStr.charAt(i));

}

outBuf.flip();

}

try {

outChannel.write(outBuf);

outBuf.clear();

}catch (java.io.IOException ex) {

ex.printStackTrace(System.err);

}

}

System.out.println (inChannel.size());

System.out.println (outChannel.size());

System.out.println ("EoF reached.");

inFile.close();

outputFile.close();

}catch(java.io.IOException e){

e.printStackTrace(System.err);

System.exit(1);

}

}

public FileDES(String srcFileName,String destFileName,String inKey,boolean actionType){

this.srcFileName=srcFileName;

this.destFileName=destFileName;

this.actionType=actionType;

*** yzePath();

srcFile=new File(srcFileName);

destFile=new File(destFileName);

this.inKey=inKey;

if (actionType==enc)

file_operate(enc);

else

file_operate(dec);

}

public static void main(String[] args){

String file1=System.getProperty("user.dir")+"/111.doc";

String file2=System.getProperty("user.dir")+"/222.doc";

String file3=System.getProperty("user.dir")+"/333.doc";

String passWord="1234ABCD";

FileDES fileDes=new FileDES(file1,file2,passWord,true);

FileDES fileDes1=new FileDES(file2,file3,passWord,false);

}

❹ Java DES加密解密算法

bcprov-ext-jdk16-143.jar
应该放到你应用的classpath下。放ext中，修改java.security 我在windows系统下居然无效的。但在linux/unix下是好的

❺ Java中 DES加密算法

package des;
import javax.crypto.Cipher;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.SecretKey;
import java.security.NoSuchAlgorithmException;
import sun.misc.*;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import javax.crypto.BadPaddingException;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.spec.SecretKeySpec;
import java.security.*;
import javax.crypto.SecretKeyFactory;
import java.security.spec.*;
import javax.crypto.spec.DESedeKeySpec;
/**
解密
*/
class DES {
private static String Algorithm = "DESede";//加密算法的名称
private static Cipher c;//密码器
private static byte[] cipherByte;
private static SecretKey deskey;//密钥
private static String keyString = "";//获得密钥的参数
//对base64编码的string解码成byte数组
public byte[] deBase64(String parm) throws IOException {
BASE64Decoder dec=new BASE64Decoder();
byte[] dnParm = dec.decodeBuffer(parm);
System.out.println(dnParm.length);
System.out.println(dnParm);
return dnParm;
}
//把密钥参数转为byte数组
public byte[] dBase64(String parm) throws IOException {
BASE64Decoder dec=new BASE64Decoder();
byte[] dnParm = dec.decodeBuffer(parm);
return dnParm;
}
/**
* 对 Byte 数组进行解密
* @param buff 要解密的数据
* @return 返回加密后的 String
*/
public static String createDecryptor(byte[] buff) throws
NoSuchPaddingException, NoSuchAlgorithmException,
UnsupportedEncodingException {
try {
c.init(Cipher.DECRYPT_MODE, deskey);//初始化密码器，用密钥deskey,进入解密模式
cipherByte = c.doFinal(buff);
}
catch(java.security.InvalidKeyException ex){
ex.printStackTrace();
}
catch(javax.crypto.BadPaddingException ex){
ex.printStackTrace();
}
catch(javax.crypto.IllegalBlockSizeException ex){
ex.printStackTrace();
}
return (new String(cipherByte,"UTF-8"));
}
public void getKey(String key) throws IOException, InvalidKeyException,
InvalidKeySpecException {
byte[] dKey = dBase64(key);
try {
deskey=new javax.crypto.spec.SecretKeySpec(dKey,Algorithm);
c = Cipher.getInstance(Algorithm);
}
catch (NoSuchPaddingException ex) {
}
catch (NoSuchAlgorithmException ex) {
}
}

public static void main(String args[]) throws IOException,
NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeySpecException,
InvalidKeyException, IOException {
DES des = new DES();
des.getKey(keyString);//获取密钥
byte[] dBy = des.deBase64("t0/fDOZ5NaQ=");//获取需要解密的字符串
String dStr = des.createDecryptor(dBy);
System.out.println("解密："+dStr);
}
}

❻ DES加密算法 java实现

c语言的源代码，供参考：

http://hi..com/gaojinshan/blog/item/8b2710c4ece4b3ce39db49e9.html

❼ 用java实现des加密和解密

一个用DES来加密、解密的类
http://www.javanb.com/java/1/17816.html

import java.security.*;
import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;

/**
* 字符串工具集合
* @author Liudong
*/
public class StringUtils {

private static final String PASSWORD_CRYPT_KEY = "__jDlog_";
private final static String DES = "DES";

/**
* 加密
* @param src 数据源
* @param key 密钥，长度必须是8的倍数
* @return 返回加密后的数据
* @throws Exception
*/
public static byte[] encrypt(byte[] src, byte[] key)throws Exception {
//DES算法要求有一个可信任的随机数源
SecureRandom sr = new SecureRandom();
// 从原始密匙数据创建DESKeySpec对象
DESKeySpec dks = new DESKeySpec(key);
// 创建一个密匙工厂，然后用它把DESKeySpec转换成
// 一个SecretKey对象
SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(DES);
SecretKey securekey = keyFactory.generateSecret(dks);
// Cipher对象实际完成加密操作
Cipher cipher = Cipher.getInstance(DES);
// 用密匙初始化Cipher对象
cipher.init(Cipher.ENCRYPT_MODE, securekey, sr);
// 现在，获取数据并加密
// 正式执行加密操作
return cipher.doFinal(src);
}

/**
* 解密
* @param src 数据源
* @param key 密钥，长度必须是8的倍数
* @return 返回解密后的原始数据
* @throws Exception
*/
public static byte[] decrypt(byte[] src, byte[] key)throws Exception {
// DES算法要求有一个可信任的随机数源
SecureRandom sr = new SecureRandom();
// 从原始密匙数据创建一个DESKeySpec对象
DESKeySpec dks = new DESKeySpec(key);
// 创建一个密匙工厂，然后用它把DESKeySpec对象转换成
// 一个SecretKey对象
SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(DES);
SecretKey securekey = keyFactory.generateSecret(dks);
// Cipher对象实际完成解密操作
Cipher cipher = Cipher.getInstance(DES);
// 用密匙初始化Cipher对象
cipher.init(Cipher.DECRYPT_MODE, securekey, sr);
// 现在，获取数据并解密
// 正式执行解密操作
return cipher.doFinal(src);
}
/**
* 密码解密
* @param data
* @return
* @throws Exception
*/
public final static String decrypt(String data){
try {
return new String(decrypt(hex2byte(data.getBytes()),
PASSWORD_CRYPT_KEY.getBytes()));
}catch(Exception e) {
}
return null;
}
/**
* 密码加密
* @param password
* @return
* @throws Exception
*/
public final static String encrypt(String password){
try {
return byte2hex(encrypt(password.getBytes(),PASSWORD_CRYPT_KEY.getBytes())); }catch(Exception e) {
}
return null;
}

比较长, 转了一部分.