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閑來無事，寫個(gè)AES（256位）加解密程序

AES加密，代碼如下：

import java.security.InvalidKeyException;

import java.util.ArrayList;

import java.util.List;

import java.util.Scanner;

import javax.crypto.*;

import javax.crypto.spec.*;

import java.io.*;

/**

* 標(biāo)題: AESUtil

* 描述: AES加密工具類實(shí)現(xiàn)對字符串(String)或文件的加密與解密支持128、192、256位密匙

* 附: 若要使用192、256位密匙需要到Sun下載jce_policy-6.zip 并解壓安裝

* @author 見習(xí)和尚

* @version 1.0, 2010/09/10

public class AESTool {

//密匙

private byte[] key;

//加密的密匙位數(shù)(默認(rèn)256位AES加密)

private int keySize = 256;

//待加密源文件

private String srcFile;

//加密后的文件

private String desFile;

//解密后的文件

private String decodeFile;

//調(diào)教后性價(jià)比很好的緩沖區(qū)大小(最好不要改動)

private int blockSize = 61440;

//有效密匙位數(shù)集合

private static List<Integer> KEYSIZELIST = new ArrayList<Integer>();

static{

//初始化有效密匙位數(shù)

KEYSIZELIST.add(128);

KEYSIZELIST.add(192);

KEYSIZELIST.add(256);

}

/**

* 構(gòu)造方法

public AESTool(String srcFile,String desFile,String decodeFile,byte[] key){

this.srcFile = srcFile;

this.desFile = desFile;

this.decodeFile = decodeFile;

this.key = key;

}

/**

* 類入口方法，包含文件及字符串加解密調(diào)用示例

* @param args

* @return void

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

System.out.println("*******************************************");

System.out.println("***************AES加密工具*******************");

System.out.println("*********操作指令：1加密 2解密 3退出**********");

System.out.println("*******************************************");

Scanner sc = new Scanner(System.in);

String commond = null;

do{

System.out.println("請輸入操作指令：");

if(sc.hasNext()){

commond = sc.nextLine();

}

}while(!"1".equals(commond) && !"2".equals(commond) && !"3".equals(commond));

if("1".equals(commond)){

System.out.println("請輸入原始文件路徑(如：c:/a.rar)");

String srcFile = null;

if(sc.hasNext()){

srcFile = sc.nextLine();

}

System.out.println("請輸入加密文件存放路徑(如：c:/b.uumap");

String desFile = null;

if(sc.hasNext()){

desFile = sc.nextLine();

}

System.out.println("請輸入32位密匙(可由字母、數(shù)字、英文特殊字符組成):");

String key = null;

if(sc.hasNext()){

key = sc.nextLine();

}

sc.close();

AESTool aesUtil = new AESTool(srcFile,desFile,null,key.getBytes());

aesUtil.encode();//文件加密

}else if("2".equals(commond)){

System.out.println("請輸入加密文件存放路徑(如：c:/b.uumap");

String desFile = null;

if(sc.hasNext()){

desFile = sc.nextLine();

}

System.out.println("請輸入解密后文件存放路徑(如：c:/c.rar");

String decodeFile = null;

if(sc.hasNext()){

decodeFile = sc.nextLine();

}

System.out.println("請輸入32位密匙(可由字母、數(shù)字、英文特殊字符組成):");

String key = null;

if(sc.hasNext()){

key = sc.nextLine();

}

sc.close();

AESTool aesUtil = new AESTool(null,desFile,decodeFile,key.getBytes());

//文件加密解密示例

aesUtil.decode();//文件解密*/

}else if("3".equals(commond)){

System.out.println("******************退出**********************");

System.exit(0);

}

/**

* 文件加密方法

* @return void

* @throws Exception

public void encode()throws Exception{

//校驗(yàn)并創(chuàng)建文件目錄

validateFile(this.desFile);

//獲取隨機(jī)密匙

byte[] raw = this.key;

//初始化SecretKeySpec對象

SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");

//初始化Cipher對象

Cipher cipher = Cipher.getInstance("AES");

//用指定密匙對象初始化加密Cipher對象

cipher.init(Cipher.ENCRYPT_MODE, skeySpec);

//加密文件

encodeFile(cipher);

}

/**

* 文件解密方法

* @return void

* @throws Exception

public void decode()throws Exception{

//校驗(yàn)并創(chuàng)建文件目錄

validateFile(this.decodeFile);

//初始化SecretKeySpec對象

SecretKeySpec skeySpec = new SecretKeySpec(this.key, "AES");

//初始化Cipher對象

Cipher cipher = Cipher.getInstance("AES");

//用指定密匙對象初始化加密Cipher對象

cipher.init(Cipher.ENCRYPT_MODE, skeySpec);

//解密文件

decodeFile(cipher,skeySpec);

}

/**

* 字符串加密方法

* @return void

* @throws Exception

public byte[] encodeStr(String str,int keySize)throws Exception{

if(!validate(str,keySize)){

System.out.println("字符串加密參數(shù)校驗(yàn)失敗");

return null;

}

//獲取KeyGenerator對象

KeyGenerator kgen = KeyGenerator.getInstance("AES");

//設(shè)置加密密匙位數(shù)，目前支持128、192、256位

kgen.init(keySize);

//獲取密匙對象

SecretKey skey = kgen.generateKey();

//獲取隨機(jī)密匙

byte[] raw = skey.getEncoded();

//初始化SecretKeySpec對象

SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");

//初始化Cipher對象

Cipher cipher = Cipher.getInstance("AES");

//用指定密匙對象初始化加密Cipher對象

cipher.init(Cipher.ENCRYPT_MODE, skeySpec);

//加密字符串

return cipher.doFinal(str.getBytes("utf-8"));

}

/**

* 字符串解密方法

* @return void

* @throws Exception

public String decodeStr(byte[] date)throws Exception{

if(null == date || date.length%16 !=0 ){

System.out.println("字符串解密參數(shù)校驗(yàn)失敗");

return null;

}

//初始化SecretKeySpec對象

SecretKeySpec skeySpec = new SecretKeySpec(this.key, "AES");

//初始化Cipher對象

Cipher cipher = Cipher.getInstance("AES");

//用指定密匙對象初始化加密Cipher對象

cipher.init(Cipher.DECRYPT_MODE, skeySpec);

//解密字符串

byte[] decData = cipher.doFinal(date);

return new String(decData,"utf-8");

}

/**

* 文件加密具體邏輯實(shí)現(xiàn)方法

* @param cipher

* @return void

public void encodeFile(Cipher cipher) {

System.out.println("**********啟動加密************");

try {

long readfilelen = 0;

BufferedRandomAccessFile brafReadFile;

BufferedRandomAccessFile brafWriteFile;

brafReadFile = new BufferedRandomAccessFile(this.srcFile);

readfilelen = brafReadFile.initfilelen;

brafWriteFile = new BufferedRandomAccessFile(this.desFile, "rw", 10);

byte buf[] = new byte[this.blockSize];

int readcount;

long start = System.currentTimeMillis();

double count = 0;

while((readcount = brafReadFile.read(buf)) != -1) {

count+=readcount;

byte[] encData = cipher.doFinal(buf);

brafWriteFile.write(encData);

System.out.println("加密進(jìn)度--->"+(int)((count/readfilelen)*100)+"%");

}

System.out.println("BufferedRandomAccessFile Copy & Write File: "

+ brafReadFile.filename

+ " FileSize: "

+ java.lang.Integer.toString((int)readfilelen >> 1024)

+ " (KB) "

+ "Spend: "

+(double)(System.currentTimeMillis()-start) / 1000

+ "(s)");

brafWriteFile.close();

brafReadFile.close();

System.out.println("**********加密完成************");

} catch (FileNotFoundException e) {

e.printStackTrace();

}catch (IllegalBlockSizeException e) {

e.printStackTrace();

} catch (BadPaddingException e) {

e.printStackTrace();

}catch (IOException e) {

e.printStackTrace();

}

/**

* 文件解密具體邏輯實(shí)現(xiàn)方法

* @param cipher

* @param skeySpec

* @return void

public void decodeFile(Cipher cipher,SecretKeySpec skeySpec){

try {

cipher.init(Cipher.DECRYPT_MODE, skeySpec);

} catch (InvalidKeyException e) {

e.printStackTrace();

}

System.out.println("**********啟動解密************");

try {

long readfilelen = 0;

BufferedRandomAccessFile brafReadFile;

BufferedRandomAccessFile brafWriteFile;

brafReadFile = new BufferedRandomAccessFile(this.desFile);

readfilelen = brafReadFile.initfilelen;

brafWriteFile = new BufferedRandomAccessFile(this.decodeFile, "rw", 10);

byte buf[] = new byte[this.blockSize+16];

int readcount;

long start = System.currentTimeMillis();

double count = 0;

while((readcount = brafReadFile.read(buf)) != -1) {

count+=readcount;

byte[] decData = cipher.doFinal(buf);

brafWriteFile.write(decData);

System.out.println("解密進(jìn)度--->"+(int)((count/readfilelen)*100)+"%");

}

System.out.println("BufferedRandomAccessFile Copy & Write File: "

+ brafReadFile.filename

+ " FileSize: "

+ java.lang.Integer.toString((int)readfilelen >> 1024)

+ " (KB) "

+ "Spend: "

+(double)(System.currentTimeMillis()-start) / 1000

+ "(s)");

brafWriteFile.close();

brafReadFile.close();

System.out.println("**********解密完成************");

} catch (FileNotFoundException e) {

e.printStackTrace();

}catch (IllegalBlockSizeException e) {

e.printStackTrace();

} catch (BadPaddingException e) {

e.printStackTrace();

}catch (IOException e) {

e.printStackTrace();

}

/**

* 參數(shù)校驗(yàn)

* @return boolean

private static boolean validate(String str, int keySize) {

if(null==str){

return false;

}

return KEYSIZELIST.contains(keySize);

}

/**

* 文件參數(shù)校驗(yàn)，若不存在改文件目錄，則創(chuàng)建目錄;若該文件存在則刪除此文件

* @return boolean

private static boolean validateFile(String filePath) {

if(null==filePath || "".equals(filePath)){

System.out.println("無效的文件路徑");

return false;

}

String dir = filePath.substring(0, filePath.lastIndexOf("/")+1);

File dirFile = new File(dir);

if(!dirFile.exists()){

dirFile.mkdirs();

}

File file = new File(filePath);

if(file.exists()){

file.delete();

}

return true;

}

希望各位給點(diǎn)意見~~~

posted on 2010-09-16 19:36 見習(xí)和尚閱讀(6525) 評論(5) 編輯收藏

suzixu

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