最簡單的就一個(gè)FOR循環(huán)要加密的文件 再聲明一個(gè)字符串 遍歷 要加密的文件和字符串進(jìn)行位與操作或之類操作
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類似這樣-
import java.util.Arrays;
public class Test {
public static void main(String[] args) {
String str = "hello";
byte[] strCode = str.getBytes();
System.out.println("原始信息字節(jié)碼:"+Arrays.toString(strCode));
String key = "abcde";
byte[] keyCode = key.getBytes();
System.out.println("密鑰字節(jié)碼:"+Arrays.toString(keyCode));
byte[] finallyCode = new byte[strCode.length];
for(int i=0;istr.length();i++){
finallyCode[i] = (byte) (strCode[i] ^ keyCode[i]);
}
System.out.println("加密后的字節(jié)碼:"+Arrays.toString(finallyCode));
System.out.println("加密后的字符串:"+new String(finallyCode));
//============解密
for(int i=0;istr.length();i++){
finallyCode[i] = (byte) (finallyCode[i] ^ keyCode[i]);
}
System.out.println("解密后的字節(jié)碼:"+Arrays.toString(finallyCode));
System.out.println("解密后的字符串:"+new String(finallyCode));
}
}
package com.cube.limail.util;
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
public?static?void?main(String[]?args)?throws?Exception?{??
String?data?=?"itxxz";??
System.out.println("字符串:itxxz");??
System.err.println("加密:"+encrypt(data));??
System.err.println("解密:"+decrypt(encrypt(data)));??
}
運(yùn)行結(jié)果:
由于代碼太多,可到 ?itxxz.com/a/javashili/2014/1217/encrypt_decrypt.html? 查看,注釋也比較完整,清晰易懂
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
public class XorExample {
public static final byte XOR_CONST = 0X12;
public static void main(String[] args) throws Exception {
File src = new File("level1.txt");
File dest = new File("level2.txt");
File dest2 = new File("level3.txt");
xorEn(src, dest);
xorEn(dest, dest2);
}
/**
* 異或的一個(gè)特點(diǎn): a^b = c c^b = a
* 所以簡單點(diǎn),這里的加解密都用一個(gè)函數(shù)就行了
* @param src
* @param dest
* @throws Exception
*/
public static void xorEn(File src, File dest) throws Exception {
// 文件不存在或?yàn)槲募A就不判斷了
FileInputStream fis = new FileInputStream(src);
FileOutputStream fos = new FileOutputStream(dest);
byte[] bs = new byte[1024];
int len = 0;
while ((len = fis.read(bs)) != -1) {
for (int i = 0; i len; i++) {
bs[i] ^= XOR_CONST;
}
fos.write(bs, 0, len);
}
fos.close();
fis.close();
}
}
分享題目:Java加密解密干擾代碼 java加密算法代碼
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