aes.java

QQ聊天工具的源代码

/*
 * AES.java
 *
 * Created on 2007年12月21日, 下午7:01
 *
 * To change this template, choose Tools | Template Manager
 * and open the template in the editor.
 */
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.math.BigInteger;
import java.security.InvalidKeyException;
import java.security.Key;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import java.security.spec.InvalidKeySpecException;
import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.KeyGenerator;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.SecretKeySpec;
/**
 *
 * @author deadknight
 */
public class AES {
    
    /** Creates a new instance of AES */
    public AES() {}
    
    public static void main(String[] args) throws NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException, IOException, IllegalBlockSizeException, BadPaddingException, InvalidKeySpecException 
    {
        String test = "gohome never BACK!";
        String aeskey = "1234567890abcdef";
        byte plain[] = test.getBytes();
       // byte k[] = AES.getKey();
        byte k[] = aeskey.getBytes();
        byte c[] = AES.encrpyt(plain,k);
        byte p[] = AES.decrpyt(c,k);
        
        System.out.println(new String (c)) ;
        System.out.println(new String (p));
        
    }
    public static byte[] getKey()
    {
        byte[] raw = null;
        try
        {
            BigInteger aesKeyBigInteger = new BigInteger("C5F9D65AEB7165562E38CE328108167A",16);
            KeyGenerator kg = KeyGenerator.getInstance("AES");
            kg.init(128, new SecureRandom(aesKeyBigInteger.toString().getBytes()));
            SecretKey skey = kg.generateKey();
            raw = skey.getEncoded();
//	    System.out.println(raw);
	    String keyString = "[B@16f8cd0";
	    byte rawString [] = keyString.getBytes();
	
        }catch(Exception ex)
        {
            ex.printStackTrace();
        }
        return raw;
        
    }
    public static byte[] encrpyt(byte plaintext[], byte keyBytes[])
    {
        byte[] cipher = null;
        try
        {
            Key key = new SecretKeySpec(keyBytes,"AES");
            Cipher enCipher = Cipher.getInstance("AES");
            enCipher.init(Cipher.ENCRYPT_MODE,key);
            cipher = enCipher.doFinal(plaintext);
        }catch(Exception ex)
        {
            ex.printStackTrace();
        }
        return cipher;
        
    }
    public static byte[] decrpyt(byte ciphertext[], byte keyBytes[])
    {
        byte[] plain = null;
        try
        {
            Key key = new SecretKeySpec(keyBytes,"AES");
            Cipher deCipher = Cipher.getInstance("AES");
            deCipher.init(Cipher.DECRYPT_MODE,key);
            plain = deCipher.doFinal(ciphertext);   
        }catch(Exception ex)
        {
            ex.printStackTrace();
        }
        return plain;
        
    }
}