哪位高手知道哪里有应用在网络传输中的加密IO流,谢谢！（在线等待）

Question

我用javax.crypto.CipherInputStream;CipherOutputStream

Answer 1

你仔细看看，里面有你要的东西，再加上我正在弄的程序(还没有完成)。在读取解密内容时出现错误了。http://www.zdnet.com.cn/developer/code/story/0,2000081534,39038484,00.htmhttp://www.zdnet.com.cn/developer/code/story/0,2000081534,39038484-2,00.htmpackage temptest_project;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
 * 
 * <p>Title: newman的类库</p>
 * <p>Description: 没有最好只有更好</p>
 * <p>Copyright: Copyright (c) 2002</p>
 * <p>Company: shu</p>
 * @author [email protected]
 * @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) {
                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=256;
                    byte[] byteTom=new byte[nEnd];
                    int nCount=0;                    
                    InputStream is=this.getInputStream(inputStream); 
                    System.out.println("following is from is");                                       while((nCount=is.read(byteTom,0,nEnd))!=-1){
                          String s=new String (byteTom,0,nEnd);
                          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("100");
            byte[] en_string,de_string;
            en_string = PBE1.encode("127.0.0.1".getBytes());
            de_string = PBE1.decode(en_string);
            System.out.println(new String (en_string));
            System.out.println(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
27
13
-88
-126
98
-16
-15
61
64
-58
121
17
-82
-87
-96
17
*********************
*********************
解密前
27
13
-88
-126
98
-16
-15
61
64
-58
121
17
-82
-87
-96
17
*********************
[B@388993 ----------这是byte的地址
[B@d04653
*/