加密程序在解密时问题出在那里,怎么改啊.

Question

package Lib;/*安全程序 DESede/DES测试*/
import java.security.*;
import javax.crypto.*;
import java.lang.*;

public class TmpDES
{
public String sAlgorithm = "DES";
public SecretKey deskey; public TmpDES()
{
// 
}

    public static void main(String[] args)
    {
     String testInfo = "要加密的信息";
        TmpDES app = new TmpDES();        
        System.out.println("加密前的信息:" + testInfo);
        System.out.println("加密前的二进串:" + app.byte2hex(testInfo.getBytes()));
        String sEncryptInformation = app.Encrypt(testInfo);
        System.out.println("加密后的信息:" + sEncryptInformation);
        System.out.println("加密后的二进串:" + app.byte2hex(sEncryptInformation.getBytes()));        System.out.println("================================================================");
        System.out.println("解密前的信息:" + sEncryptInformation);
System.out.println("解密前的二进串:" + app.byte2hex(sEncryptInformation.getBytes()));
        String sDecryptInformation = app.Decrypt(sEncryptInformation);
        System.out.println("解密后的信息:" + sDecryptInformation);
System.out.println("解密后的二进串:" + app.byte2hex(sDecryptInformation.getBytes()));
    }
    
/**
 * 加密
 * 
*/
    public  String Encrypt(String sInformation)
    {        
        // 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());        

       try
       {
           // 生成密钥   
           KeyGenerator keygen = KeyGenerator.getInstance(sAlgorithm);
           deskey = keygen.generateKey();
           System.out.println("密钥:" + deskey);
           // 加密 
           Cipher cipher = Cipher.getInstance(sAlgorithm);
           cipher.init(Cipher.ENCRYPT_MODE,deskey);
           byte[] cipherByte = cipher.doFinal(sInformation.getBytes());   
           return byte2hex(cipherByte);
        } 
        catch(NoSuchAlgorithmException e1)
        {
         System.out.println("NoSuchAlgorithmException:" + e1.getMessage());
         return null;
        }
        catch(NoSuchPaddingException e2)
        {
         System.out.println("NoSuchPaddingException:" + e2.getMessage());
         return null;
        }
        catch(Exception e3)
        {
         System.out.println("Exception:" + e3.getMessage());
         return null;
        }
    }
    
    public  String Decrypt(String sInformation)
    {
        // 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());

       try
       {                      
   System.out.println("密钥:" + deskey);
           // 解密   
           Cipher cipher = Cipher.getInstance(sAlgorithm);
           cipher.init(Cipher.DECRYPT_MODE, deskey);
           byte[] cipherByte = cipher.doFinal(sInformation.getBytes());
   return byte2hex(cipherByte);
        } 
        catch(NoSuchAlgorithmException e1)
        {
         System.out.println("NoSuchAlgorithmException:" + e1.getMessage());
         return null;
        }
        catch(NoSuchPaddingException e2)
        {
         System.out.println("NoSuchPaddingException:" + e2.getMessage());
         return null;
        }
        catch(Exception e3)
        {
         System.out.println("Exception:" + e3.getMessage());
         return null;
        }
    }
    
    // 二行制转字符串 
    public 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();
    }
}

Answer 1

import java.security.*;
import javax.crypto.*;
import java.lang.*;public class Test {
    public String sAlgorithm = "DES";
    public SecretKey deskey;    public Test() {
        // 
    }    public static void main(String[] args) {
        String testInfo = "我是莫飞";
        Test app = new Test();
        System.out.println("加密前的信息:" + testInfo);
        System.out.println("加密前的二进串:" + app.byte2hex(testInfo.getBytes()));
        byte[] sEncryptInformation = app.Encrypt(testInfo.getBytes());
        System.out.println("加密后的二进串:" + app.byte2hex(sEncryptInformation));
        System.out.println("加密后的信息:" + new String(sEncryptInformation));
        byte[] sDecryptInformation = app.Decrypt(sEncryptInformation);
        System.out.println("解密后的二进串:" + app.byte2hex(sDecryptInformation));
        System.out.println("解密后的信息:" + new String(sDecryptInformation));
    }    /**
     * 加密
     * 
     */
    public byte[] Encrypt(byte[] sInformation) {
        // 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());        try {
            // 生成密钥
            KeyGenerator keygen = KeyGenerator.getInstance(sAlgorithm);
            deskey = keygen.generateKey();
            System.out.println("密钥:" + deskey);
            // 加密
            Cipher cipher = Cipher.getInstance(sAlgorithm);
            cipher.init(Cipher.ENCRYPT_MODE, deskey);
            byte[] cipherByte = cipher.doFinal(sInformation);
            return cipherByte;
        } catch (NoSuchAlgorithmException e1) {
            System.out.println("NoSuchAlgorithmException:" + e1.getMessage());
            return null;
        } catch (NoSuchPaddingException e2) {
            System.out.println("NoSuchPaddingException:" + e2.getMessage());
            return null;
        } catch (Exception e3) {
            e3.printStackTrace();
            System.out.println("Exception:" + e3.getMessage());
            return null;
        }
    }    public byte[] Decrypt(byte[] sInformation) {
        // 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());        try {
            System.out.println("密钥:" + deskey);
            // 解密
            Cipher cipher = Cipher.getInstance(sAlgorithm);
            cipher.init(Cipher.DECRYPT_MODE, deskey);
            byte[] cipherByte = cipher.doFinal(sInformation);
            return cipherByte;
        } catch (NoSuchAlgorithmException e1) {
            System.out.println("NoSuchAlgorithmException:" + e1.getMessage());
            return null;
        } catch (NoSuchPaddingException e2) {
            System.out.println("NoSuchPaddingException:" + e2.getMessage());
            return null;
        } catch (Exception e3) {
            e3.printStackTrace();
            System.out.println("Exception:" + e3.getMessage());
            return null;
        }
    }    // 二行制转字符串
    public 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();
    }
}