菜鸟求三重DES加密,解密代码

Question

RT...请各位大虾不吝赐教,小弟感激涕零...

Answer 1

import java.io.*;
 import java.security.*;
 import javax.crypto.*;
 import javax.crypto.spec.*; /**
    This program tests the DES cipher. Usage:
    java DESTest -genkey keyfile
    java DESTest -encrypt plaintext encrypted keyfile
    java DESTest -decrypt encrypted decrypted keyfile
 */
 public class DESTest
 {
    public static void main(String[] args)
    {
       try
       {
          if (args[0].equals("-genkey"))
          {
             KeyGenerator keygen
                = KeyGenerator.getInstance("DES");
             SecureRandom random = new SecureRandom();
             keygen.init(random);
             SecretKey key = keygen.generateKey();
             ObjectOutputStream out = new ObjectOutputStream(
                new FileOutputStream(args[1]));
             out.writeObject(key);
             out.close();
          }
          else
          {
             int mode;
             if (args[0].equals("-encrypt"))
                mode = Cipher.ENCRYPT_MODE;
             else
                mode = Cipher.DECRYPT_MODE;             ObjectInputStream keyIn = new ObjectInputStream(
                new FileInputStream(args[3]));
             Key key = (Key) keyIn.readObject();
             keyIn.close();             InputStream in = new FileInputStream(args[1]);
             OutputStream out = new FileOutputStream(args[2]);
             Cipher cipher = Cipher.getInstance("DES");
             cipher.init(mode, key);             crypt(in, out, cipher);
             in.close();
             out.close();
          }
       }
       catch (IOException exception)
       {
          exception.printStackTrace();
       }
       catch (GeneralSecurityException exception)
       {
          exception.printStackTrace();
       }
       catch (ClassNotFoundException exception)
       {
          exception.printStackTrace();
      }
    }    /**
       Uses a cipher to transform the bytes in an input stream
       and sends the transformed bytes to an output stream.
       @param in the input stream
       @param out the output stream
       @param cipher the cipher that transforms the bytes
    */
    public static void crypt(InputStream in, OutputStream out,
       Cipher cipher) throws IOException, GeneralSecurityException
    {
       int blockSize = cipher.getBlockSize();
       int outputSize = cipher.getOutputSize(blockSize);
       byte[] inBytes = new byte[blockSize];
       byte[] outBytes = new byte[outputSize];       int inLength = 0;;
       boolean more = true;
       while (more)
       {
          inLength = in.read(inBytes);
          if (inLength == blockSize)
          {
             int outLength
                = cipher.update(inBytes, 0, blockSize, outBytes);
             out.write(outBytes, 0, outLength);
             System.out.println(outLength);
          }
          else more = false;
       }
       if (inLength > 0)
          outBytes = cipher.doFinal(inBytes, 0, inLength);
       else
          outBytes = cipher.doFinal();
       System.out.println(outBytes.length);
    out.write(outBytes);
   }
 }
自己再改改吧

Answer 2

感谢rukhwill(志) ...
只是我现在想把加密后的信息保存至数据库表中，而不是输出至文件，不知道代码应该作何改动呢？