帮我编一个简单的加密程序？

核心的部分你不是已经写好了吗
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不是都一样吗？import java.security.*;
import java.security.cert.X509Certificate;
import java.io.*;
import javax.crypto.*;
import javax.crypto.spec.*;
import java.lang.*;
import com.newman.io.FileReadWrite;
/**
* PBE算法
*
* Title: newman的类库
* Description: 没有最好只有更好
* Copyright: Copyright (c) 2002
* Company: [email protected]
* @author newman0708
* @version 1.0
*/
public class PBE{
 private String m_Password;
 private final String SECRETKEYFACTORY= "PBEWithMD5AndDES";
 private byte[] m_Salt = {
 (byte)0xc7, (byte)0x73, (byte)0x21, (byte)0x8c,
 (byte)0x7e, (byte)0xc8, (byte)0xee, (byte)0x99
 };

 private PBEKeySpec m_pbeKeySpec=null;
 private SecretKeyFactory m_keyFac=null;
 private SecretKey m_pbeKey=null;
 private PBEParameterSpec m_pbeParamSpec=null;
 private Cipher m_pbeCipher=null;
 private int m_Count = 2;//???
 public PBE(String password){
 this.setPassword(password);
 init();
 }
 public void setPassword(String password){
 this.m_Password =password;
 }
 private void init(){
 try {
 this.m_pbeKeySpec = new PBEKeySpec(this.m_Password.toCharArray());
 this.m_keyFac = SecretKeyFactory.getInstance(this.SECRETKEYFACTORY);
 this.m_pbeKey = this.m_keyFac.generateSecret(this.m_pbeKeySpec);
 // 生成pbe算法所需的参数对象，两个参数详见 RSA的 PKCS #5 标准
 this.m_pbeParamSpec = new PBEParameterSpec(this.m_Salt, this.m_Count);
 // 生成一个加密器
 this.m_pbeCipher= Cipher.getInstance(this.SECRETKEYFACTORY);
 }
 catch (Exception ex) {

 }
 }
 public byte[] encode(byte[] info){
 if(info==null)
 return null;
 try{
 // 初始化加密器
 this.m_pbeCipher.init(Cipher.ENCRYPT_MODE,this.m_pbeKey,this.m_pbeParamSpec);
 // 明文
 byte[] cleartext = info;
 // 加密
 byte[] ciphertext = this.m_pbeCipher.doFinal(cleartext);
 System.out.println("*********************");
 System.out.println("加密后");
 for (int i = 0 ;i<ciphertext.length ;i++){
 System.out.println(ciphertext[i]);
 }
 System.out.println("*********************");
 //返回密文
 return ciphertext;
 }
 catch (Exception e){
 System.out.println(e);
 return null;
 }
 }
 public byte[] decode(byte[] info){
 if(info==null)
 return null;
 try{
 // 初始化加密器
 this.m_pbeCipher.init(Cipher.DECRYPT_MODE,this.m_pbeKey, this.m_pbeParamSpec);

 // 密文
 byte[] ciphertext = info;

 System.out.println("*********************");
 System.out.println("解密前");
 for (int i = 0 ;i<ciphertext.length ;i++){
 System.out.println(ciphertext[i]);
 }
 System.out.println("*********************");
 // 解密
 byte[] cleartext = this.m_pbeCipher.doFinal(ciphertext);
 //返回明文
 return cleartext;
 }
 catch (Exception e){
 System.out.println(e);
 return null;
 }
 }

 public InputStream getInputStream(InputStream is) throws IOException {
 try {
 this.m_pbeCipher.init(Cipher.DECRYPT_MODE,this.m_pbeKey, this.m_pbeParamSpec);
 CipherInputStream cis = new CipherInputStream(is, this.m_pbeCipher);
 return cis;
 }
 catch (Exception ex) {
 return null;
 }
 }
 public OutputStream getOutputStream(OutputStream os) throws IOException {
 try {
 this.m_pbeCipher.init(Cipher.ENCRYPT_MODE,this.m_pbeKey,this.m_pbeParamSpec);
 CipherOutputStream cos = new CipherOutputStream(os, this.m_pbeCipher);
 return cos;
 }
 catch (Exception ex) {
 System.err.println("error: getOutputStream");
 return null;
 }
 }
 public void writeFile(OutputStream os,String content){
 try {
 OutputStream os2=this.getOutputStream(os);
 byte[] tom=content.getBytes();
 System.out.println("byte("+tom.length +"): "+new String(tom));
 os2.write(content.getBytes());
 }
 catch (Exception ex) {
 }
 }
 public void PRINT(InputStream inputStream){
 try {
 int nEnd=128;
 byte[] byteTom=new byte[nEnd];
 int nCount=0;
 //StringBuffer bufftext=new StringBuffer();
 InputStream is=this.getInputStream(inputStream);
 System.out.println("following is from is");
 while((nCount=is.read(byteTom))!=-1){
 String s=new String (byteTom);
 System.out.println(s);
 }
 is.close ();
 }
 catch (Exception ex) {
 System.err.println("ERROR: "+ex.toString());
 }
 }

 public static void main(String[] args) throws Exception{
 /*
 PBE PBE1 = new PBE("newman0708");
 byte[] en_string,de_string;
 String content="Description: author [email protected]";//41
 String content2="Description: 没有最好只有更好";//29
 en_string = PBE1.encode(content2.getBytes());
 de_string = PBE1.decode(en_string);
 System.out.println("en_string: "+new String (en_string));
 System.out.println("de_string: "+new String (de_string));
 */
 PBE PBE1 = new PBE("newman0708");
 String content="Description: author [email protected]";//41
 String content2="Description: 没有最好只有更好";//29
 FileOutputStream bw =new FileOutputStream("f://foo.txt");
 PBE1.writeFile(bw,content);
 BufferedInputStream br =new BufferedInputStream(new FileInputStream("f://foo.txt"));
 PBE1.PRINT(br);
 }
 }/*
*********************
加密后
113
-89
-55
-60
-122
-94
76
-122
36
114
-121
3
6
38
-22
-61
10
-110
23
115
-45
-81
-62
-75
111
-73
93
60
-23
80
100
-128
*********************
*********************
解密前
113
-89
-55
-60
-122
-94
76
-122
36
114
-121
3
6
38
-22
-61
10
-110
23
115
-45
-81
-62
-75
111
-73
93
60
-23
80
100
-128
*********************
en_string:
de_string: Description: 没有最好只有更好
*/

调试易

帮我编一个简单的加密程序？

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