mcipher.java

httptunnel.jar httptunnel java 源码

package net.jumperz.app.httptunnel;

import java.io.*;
import java.security.*;
import javax.crypto.*;
import javax.crypto.spec.*;

import net.jumperz.security.MCryptInfo;

public final class MCipher
implements MCryptInfo
{
private Cipher encryptCipher;
private Cipher decryptCipher;
private SecretKeySpec key;
private File keyFile;

public  static String keyFileName;
private static MCipher instance;
//----------------------------------------------------------------------------------------------
public static final synchronized MCipher getInstance()
throws Exception
{
if( instance == null )
	{
	instance = new MCipher();
	}
return instance;
}
//----------------------------------------------------------------------------------------------
private MCipher()
throws Exception
{
key = null;
keyFile = new File( keyFileName );

if( keyFile.exists() )
	{
	FileInputStream ifstream = new FileInputStream( keyFile );
	ObjectInputStream iostream = new ObjectInputStream( ifstream );
	key = ( SecretKeySpec )iostream.readObject();
	iostream.close();
	}
else
	{
	throw new FileNotFoundException( keyFileName );
	}

encryptCipher = Cipher.getInstance( ALG + "/" + MODE + "/" + PADDING );
encryptCipher.init( Cipher.ENCRYPT_MODE, key );

decryptCipher = Cipher.getInstance( ALG + "/" + MODE + "/" + PADDING  );
decryptCipher.init( Cipher.DECRYPT_MODE, key );
}

//----------------------------------------------------------------------------------------------
public final synchronized byte[] encrypt( byte[] data )
throws Exception
{
return encryptCipher.doFinal( data );
}
//----------------------------------------------------------------------------------------------
public final synchronized byte[] decrypt( byte[] data )
throws Exception
{
return decryptCipher.doFinal( data );
}
//----------------------------------------------------------------------------------------------
}