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md5加密：
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package com.ncs.pki.util;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
public class MD5Test {
private static MessageDigest digest = null;
public synchronized static final String hash(String data) {
if (digest == null) {
try {
digest = MessageDigest.getInstance("MD5");
} catch (NoSuchAlgorithmException nsae) {
System.err.println(
"Failed to load the MD5 MessageDigest. "
+ "Jive will be unable to function normally.");
nsae.printStackTrace();
}
}
// Now, compute hash.
digest.update(data.getBytes());
return encodeHex(digest.digest());
}
public static final String encodeHex(byte[] bytes) {
StringBuffer buf = new StringBuffer(bytes.length * 2);
int i;
for (i = 0; i bytes.length; i++) {
if (((int) bytes[i] 0xff) 0x10) {
buf.append("0");
}
buf.append(Long.toString((int) bytes[i] 0xff, 16));
}
return buf.toString();
}
public static String test(){
return null;
}
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
System.out.println(MD5Test.hash("123456"));
}
}
3des加密：
package com.ncs.pki.util;
import java.security.Key;
import java.security.SecureRandom;
import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;
public class DesEncrypt {
/**
*
* 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
*/
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 = "";
BASE64Encoder base64en = new BASE64Encoder();
try {
byteMing = strMing.getBytes("UTF8");
byteMi = this.getEncCode(byteMing);
strMi = base64en.encode(byteMi);
} catch (Exception e) {
e.printStackTrace();
} finally {
base64en = null;
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) {
BASE64Decoder base64De = new BASE64Decoder();
byte[] byteMing = null;
byte[] byteMi = null;
String strMing = "";
try {
byteMi = base64De.decodeBuffer(strMi);
byteMing = this.getDesCode(byteMi);
strMing = new String(byteMing, "UTF8");
} catch (Exception e) {
e.printStackTrace();
} finally {
base64De = null;
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;
}
public static void main(String[] args) {
System.out.println("des demo");
DesEncrypt des = new DesEncrypt();// 实例化一个对像
des.getKey("MYKEY");// 生成密匙
System.out.println("key=MYKEY");
String strEnc = des.getEncString("111111");// 加密字符串,返回String的密文
System.out.println("密文=" + strEnc);
String strDes = des.getDesString(strEnc);// 把String 类型的密文解密
System.out.println("明文=" + strDes);
}
}
.security.*;
import javax.crypto.*;
import javax.crypto.spec.SecretKeySpec;
public class ThreeDes {
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);
} catch (java.security.NoSuchAlgorithmException e1) {
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) {
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;nb.length;n++) {
stmp=(java.lang.Integer.toHexString(b[n] 0XFF));
if (stmp.length()==1) hs=hs+"0"+stmp;
else hs=hs+stmp;
if (nb.length-1) hs=hs+":";
}
return hs.toUpperCase();
}
public static void main(String[] args)
{
//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)));
}
}
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()+(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;
*** 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);
}
/*
* 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();
}
}