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* 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: 因為 任意一個字符串,都是由若干字節(jié)表示的,每個字節(jié)實質就是一個
// 有8位的進進制數(shù),
// 又因為 一個8位二進制數(shù),可用兩位16進制字符串表示.
// 因此 任意一個字符串可以由兩位16進制字符串表示。
// 而 DES是對8位二進制數(shù)進行加密,解密。
// 所以 用DES加密解密時,可以把加密所得的8位進進制數(shù),轉成
// 兩位16進制數(shù)進行保存,傳輸。
// 具體方法:1 把一個字符串轉成8位二進制數(shù),用DES加密,得到8位二進制數(shù)的
// 密文
// 2 然后把(由1)所得的密文轉成兩位十六進制字符串
// 3 解密時,把(由2)所得的兩位十六進制字符串,轉換成8位二進制
// 數(shù)的密文
// 4 把子3所得的密文,用DES進行解密,得到8位二進制數(shù)形式的明文,
// 并強制轉換成字符串。
// 思考:為什么要通過兩位16進制數(shù)字符串保存密文呢?
// 原因是:一個字符串加密后所得的8位二進制數(shù),通常不再時字符串了,如果
// 直接把這種密文所得的8位二進制數(shù)強制轉成字符串,有許多信息因為異
// 常而丟失,導制解密失敗。因制要把這個8位二制數(shù),直接以數(shù)的形式
// 保存下來,而通常是用兩位十六進制數(shù)表示。
package frelationmainten;
import java.security.Key;
import java.security.SecureRandom;
import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
/**
*
* 使用DES加密與解密,可對byte[],String類型進行加密與解密
* 密文可使用String,byte[]存儲.
*
* 方法:
* void getKey(String strKey)從strKey的字條生成一個Key
*
* String getEncString(String strMing)對strMing進行加密,返回String密文
* String getDesString(String strMi)對strMin進行解密,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;
/**
* 根據(jù)參數(shù)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明文輸入,String密文輸出
* @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密文輸入,String明文輸出
* @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[]明文輸入,byte[]密文輸出
* @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[]密文輸入,以byte[]明文輸出
* @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;
}
/**
* 二行制轉字符串
* @param b
* @return
*/
public static String byte2hex(byte[] b) { //一個字節(jié)的數(shù),
// 轉成16進制字符串
String hs = "";
String stmp = "";
for (int n = 0; n b.length; n++) {
//整數(shù)轉成十六進制表示
stmp = (java.lang.Integer.toHexString(b[n] 0XFF));
if (stmp.length() == 1)
hs = hs + "0" + stmp;
else
hs = hs + stmp;
}
return hs.toUpperCase(); //轉成大寫
}
public static byte[] hex2byte(byte[] b) {
if((b.length%2)!=0)
throw new IllegalArgumentException("長度不是偶數(shù)");
byte[] b2 = new byte[b.length/2];
for (int n = 0; n b.length; n+=2) {
String item = new String(b,n,2);
// 兩位一組,表示一個字節(jié),把這樣表示的16進制字符串,還原成一個進制字節(jié)
b2[n/2] = (byte)Integer.parseInt(item,16);
}
return b2;
}
public static void main(String[] args){
System.out.println("hello");
DesEncrypt des=new DesEncrypt();//實例化一個對像
des.getKey("aadd");//生成密匙
String strEnc = des.getEncString("云海飛舞云122");//加密字符串,返回String的密文
System.out.println(strEnc);
String strDes = des.getDesString(strEnc);//把String 類型的密文解密
System.out.println(strDes);
new DesEncrypt();
}
}
一個用DES來加密、解密的類
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 數(shù)據(jù)源
* @param key 密鑰,長度必須是8的倍數(shù)
* @return 返回加密后的數(shù)據(jù)
* @throws Exception
*/
public static byte[] encrypt(byte[] src, byte[] key)throws Exception {
//DES算法要求有一個可信任的隨機數(shù)源
SecureRandom sr = new SecureRandom();
// 從原始密匙數(shù)據(jù)創(chuàng)建DESKeySpec對象
DESKeySpec dks = new DESKeySpec(key);
// 創(chuàng)建一個密匙工廠,然后用它把DESKeySpec轉換成
// 一個SecretKey對象
SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(DES);
SecretKey securekey = keyFactory.generateSecret(dks);
// Cipher對象實際完成加密操作
Cipher cipher = Cipher.getInstance(DES);
// 用密匙初始化Cipher對象
cipher.init(Cipher.ENCRYPT_MODE, securekey, sr);
// 現(xiàn)在,獲取數(shù)據(jù)并加密
// 正式執(zhí)行加密操作
return cipher.doFinal(src);
}
/**
* 解密
* @param src 數(shù)據(jù)源
* @param key 密鑰,長度必須是8的倍數(shù)
* @return 返回解密后的原始數(shù)據(jù)
* @throws Exception
*/
public static byte[] decrypt(byte[] src, byte[] key)throws Exception {
// DES算法要求有一個可信任的隨機數(shù)源
SecureRandom sr = new SecureRandom();
// 從原始密匙數(shù)據(jù)創(chuàng)建一個DESKeySpec對象
DESKeySpec dks = new DESKeySpec(key);
// 創(chuàng)建一個密匙工廠,然后用它把DESKeySpec對象轉換成
// 一個SecretKey對象
SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(DES);
SecretKey securekey = keyFactory.generateSecret(dks);
// Cipher對象實際完成解密操作
Cipher cipher = Cipher.getInstance(DES);
// 用密匙初始化Cipher對象
cipher.init(Cipher.DECRYPT_MODE, securekey, sr);
// 現(xiàn)在,獲取數(shù)據(jù)并解密
// 正式執(zhí)行解密操作
return cipher.doFinal(src);
}
/**
* 密碼解密
* @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;
}
/**
* 密碼加密
* @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;
}
比較長, 轉了一部分.
/*des密鑰生成代碼*/
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) {
// 密鑰
SecretKey skey = null;
// 密鑰隨機數(shù)生成
SecureRandom sr = new SecureRandom();
//生成密鑰文件
File file = genFile(path);
try {
// 獲取密鑰生成實例
KeyGenerator gen = KeyGenerator.getInstance(DES);
// 初始化密鑰生成器
gen.init(sr);
// 生成密鑰
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 : 生成密鑰的路徑
* SecretKeyFactory 方式生成des密鑰
* */
public static void genKey2(String path) {
// 密鑰隨機數(shù)生成
SecureRandom sr = new SecureRandom();
// byte[] bytes = {11,12,44,99,76,45,1,8};
byte[] bytes = sr.generateSeed(20);
// 密鑰
SecretKey skey = null;
//生成密鑰文件路徑
File file = genFile(path);
try {
//創(chuàng)建deskeyspec對象
DESKeySpec desKeySpec = new DESKeySpec(bytes,9);
//實例化des密鑰工廠
SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(DES);
//生成密鑰對象
skey = keyFactory.generateSecret(desKeySpec);
//寫出密鑰對象
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(
//讀取加密密鑰
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產(chǎn)生Cipher
Cipher cipher = null;
try {
//設置算法,應該與加密時的設置一樣
cipher = Cipher.getInstance("DES");
//設置解密模式
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 {
//輸出流,請注意文件名稱的獲取
BufferedOutputStream out = new BufferedOutputStream(new FileOutputStream(dest));
//輸入流
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(
//讀取加密密鑰
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產(chǎn)生Cipher
Cipher cipher = null;
try {
//設置算法,應該與加密時的設置一樣
cipher = Cipher.getInstance("DES");
//設置解密模式
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 {
//輸出流,請注意文件名稱的獲取
BufferedOutputStream out = new BufferedOutputStream(new FileOutputStream(dest));
//輸入流
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);
}
}
}