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des算法及其java程序设计,des java

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如何使用JAVA实现对字符串的DES加密和解密

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!");

}

}

}

Java中 DES加密算法

三个文件:

一:skey_DES.java

//对称秘钥生成及对象化保存

import java.io.FileOutputStream;

import java.io.ObjectOutputStream;

import javax.crypto.KeyGenerator;

import javax.crypto.SecretKey;

public class Skey_DES

{

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

{

KeyGenerator kg=KeyGenerator.getInstance("DESede");

kg.init(168);

SecretKey k=kg.generateKey();

FileOutputStream f=new FileOutputStream("key1.txt");

ObjectOutputStream b= new ObjectOutputStream(f);

b.writeObject(k);

}

};

二:SEnc.java

//对称秘钥加密,使用字节码

import java.io.*;

import java.security.*;

import javax.crypto.*;

public class SEnc

{

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

{

String s="Hello123Hello123Hello123Hello123";

FileInputStream f=new FileInputStream("key1.txt");

ObjectInputStream b=new ObjectInputStream(f);

Key k=(Key)b.readObject();

Cipher cp=Cipher.getInstance("DESede");

cp.init(Cipher.ENCRYPT_MODE,k);

byte ptext[]=s.getBytes("UTF8");

for(int i=0;iptext.length;i++)

{

System.out.print(ptext[i]+",");

}

System.out.println("");

byte ctext[]=cp.doFinal(ptext);

for(int i=0;ictext.length;i++)

{

System.out.print(ctext[i]+",");

}

FileOutputStream f2=new FileOutputStream("SEnc.txt");

f2.write(ctext);

}

};

三:SDec.java

//使用对称秘钥解密

import java.io.*;

import java.security.*;

import javax.crypto.Cipher;

import javax.crypto.spec.SecretKeySpec;

public class SDec

{

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

{

FileInputStream f=new FileInputStream("SEnc.txt");

int num=f.available();

byte[] ctext=new byte[num];

f.read(ctext);

FileInputStream f2=new FileInputStream("key1.txt");

ObjectInputStream b=new ObjectInputStream(f2);

Key k=(Key)b.readObject();

Cipher cp=Cipher.getInstance("DESede");

cp.init(Cipher.DECRYPT_MODE,k);

byte[] ptext=cp.doFinal(ctext);

String p=new String(ptext,"UTF8");

System.out.println(p);

}

};

DES加密算法 java实现

/*

* DesEncrypt.java

*

* Created on 2007-9-20, 16:10:47

*

* To change this template, choose Tools | Template Manager

* and open the template in the editor.

*/

//思路: 因为 任意一个字符串,都是由若干字节表示的,每个字节实质就是一个

// 有8位的进进制数,

// 又因为 一个8位二进制数,可用两位16进制字符串表示.

// 因此 任意一个字符串可以由两位16进制字符串表示。

// 而 DES是对8位二进制数进行加密,解密。

// 所以 用DES加密解密时,可以把加密所得的8位进进制数,转成

// 两位16进制数进行保存,传输。

// 具体方法:1 把一个字符串转成8位二进制数,用DES加密,得到8位二进制数的

// 密文

// 2 然后把(由1)所得的密文转成两位十六进制字符串

// 3 解密时,把(由2)所得的两位十六进制字符串,转换成8位二进制

// 数的密文

// 4 把子3所得的密文,用DES进行解密,得到8位二进制数形式的明文,

// 并强制转换成字符串。

// 思考:为什么要通过两位16进制数字符串保存密文呢?

// 原因是:一个字符串加密后所得的8位二进制数,通常不再时字符串了,如果

// 直接把这种密文所得的8位二进制数强制转成字符串,有许多信息因为异

// 常而丢失,导制解密失败。因制要把这个8位二制数,直接以数的形式

// 保存下来,而通常是用两位十六进制数表示。

package frelationmainten;

import java.security.Key;

import java.security.SecureRandom;

import javax.crypto.Cipher;

import javax.crypto.KeyGenerator;

/**

*

* 使用DES加密与解密,可对byte[],String类型进行加密与解密

* 密文可使用String,byte[]存储.

*

* 方法:

* void getKey(String strKey)从strKey的字条生成一个Key

*

* String getEncString(String strMing)对strMing进行加密,返回String密文

* String getDesString(String strMi)对strMin进行解密,返回String明文

*

*byte[] getEncCode(byte[] byteS)byte[]型的加密

*byte[] getDesCode(byte[] byteD)byte[]型的解密

*/

public class DesEncrypt {

Key key;

/**

* 根据参数生成KEY

* @param strKey

*/

public void getKey(String strKey) {

try{

KeyGenerator _generator = KeyGenerator.getInstance("DES");

_generator.init(new SecureRandom(strKey.getBytes()));

this.key = _generator.generateKey();

_generator=null;

}catch(Exception e){

e.printStackTrace();

}

}

/**

* 加密String明文输入,String密文输出

* @param strMing

* @return

*/

public String getEncString(String strMing) {

byte[] byteMi = null;

byte[] byteMing = null;

String strMi = "";

try {

return byte2hex(getEncCode (strMing.getBytes() ) );

// byteMing = strMing.getBytes("UTF8");

// byteMi = this.getEncCode(byteMing);

// strMi = new String( byteMi,"UTF8");

}

catch(Exception e){

e.printStackTrace();

}

finally {

byteMing = null;

byteMi = null;

}

return strMi;

}

/**

* 解密 以String密文输入,String明文输出

* @param strMi

* @return

*/

public String getDesString(String strMi) {

byte[] byteMing = null;

byte[] byteMi = null;

String strMing = "";

try {

return new String(getDesCode(hex2byte(strMi.getBytes()) ));

// byteMing = this.getDesCode(byteMi);

// strMing = new String(byteMing,"UTF8");

}

catch(Exception e) {

e.printStackTrace();

}

finally {

byteMing = null;

byteMi = null;

}

return strMing;

}

/**

* 加密以byte[]明文输入,byte[]密文输出

* @param byteS

* @return

*/

private byte[] getEncCode(byte[] byteS) {

byte[] byteFina = null;

Cipher cipher;

try {

cipher = Cipher.getInstance("DES");

cipher.init(Cipher.ENCRYPT_MODE, key);

byteFina = cipher.doFinal(byteS);

}

catch(Exception e) {

e.printStackTrace();

}

finally {

cipher = null;

}

return byteFina;

}

/**

* 解密以byte[]密文输入,以byte[]明文输出

* @param byteD

* @return

*/

private byte[] getDesCode(byte[] byteD) {

Cipher cipher;

byte[] byteFina=null;

try{

cipher = Cipher.getInstance("DES");

cipher.init(Cipher.DECRYPT_MODE, key);

byteFina = cipher.doFinal(byteD);

}catch(Exception e){

e.printStackTrace();

}finally{

cipher=null;

}

return byteFina;

}

/**

* 二行制转字符串

* @param b

* @return

*/

public static String byte2hex(byte[] b) { //一个字节的数,

// 转成16进制字符串

String hs = "";

String stmp = "";

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

//整数转成十六进制表示

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

if (stmp.length() == 1)

hs = hs + "0" + stmp;

else

hs = hs + stmp;

}

return hs.toUpperCase(); //转成大写

}

public static byte[] hex2byte(byte[] b) {

if((b.length%2)!=0)

throw new IllegalArgumentException("长度不是偶数");

byte[] b2 = new byte[b.length/2];

for (int n = 0; n b.length; n+=2) {

String item = new String(b,n,2);

// 两位一组,表示一个字节,把这样表示的16进制字符串,还原成一个进制字节

b2[n/2] = (byte)Integer.parseInt(item,16);

}

return b2;

}

public static void main(String[] args){

System.out.println("hello");

DesEncrypt des=new DesEncrypt();//实例化一个对像

des.getKey("aadd");//生成密匙

String strEnc = des.getEncString("云海飞舞云122");//加密字符串,返回String的密文

System.out.println(strEnc);

String strDes = des.getDesString(strEnc);//把String 类型的密文解密

System.out.println(strDes);

new DesEncrypt();

}

}

用java实现des算法

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 analyzePath(){

String dirName;

int pos=srcFileName.lastIndexOf("/");

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=destFileName.lastIndexOf("/");

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()+(byteLeft8 ? (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; i4; i++) {

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

}

outBuf.flip();

}else{

outBuf.position(0);

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

for (int i = 0; idestStr.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;

analyzePath();

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);

}

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);

}

}

}

基于DES算法的CBC演示程序实现(java)

基于DES算法的CBC演示程序实现(java)

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