core.crypto
Class Hybrid

java.lang.Object
  core.crypto.Hybrid

public class Hybrid
extends Object

This class provides easy acces to our hybrid encryption implementations.

  Copyright (c) 2006 Sebastian Erdweg
  Copyright (c) 2006 Dominik Schulz
  Copyright (c) 2006 Florian Lindner
  Copyright (c) 2006 Betim Berjani
  
  This file is part of FlexiCrypt.

  FlexiCrypt is free software; you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation; either version 2 of the License, or
  (at your option) any later version.

  FlexiCrypt is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details.
  
  You should have received a copy of the GNU General Public License
  along with FlexiCrypt; if not, write to the Free Software
  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  

Author:

Dominik

Constructor Summary

Hybrid()

Method Summary

static void	decryptBinarySimple(PrivateKey recieversKey, File ciphertext, File plaintext) Decrypts a single File in the simple binary format.
static void	decryptXMLZIP(File ciphertext, File plaintext) Decrypts a file that was decrypted for some private key in our keystore.
static void	decryptXMLZIP(PrivateKey privateKey, File ciphertext, File plaintext) This class is only meant for unit testing!!!
static void	encryptBinarySimple(PublicKey recieversKey, File plaintext, File ciphertext, String symmetricAlgorithm, int symmStrength) Encrypts a single File for a single reciever in a simple binary format.
static void	encryptXMLZIP(X509Certificate[] recieverCerts, File plaintext, File ciphertext, String symmetricAlgorithm, int symmStrength) Encrypts a single File for an unlimited* number of recievers.

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

Hybrid

public Hybrid()

Method Detail

encryptBinarySimple

public static void encryptBinarySimple(PublicKey recieversKey,
                                       File plaintext,
                                       File ciphertext,
                                       String symmetricAlgorithm,
                                       int symmStrength)
                                throws NoSuchAlgorithmException,
                                       NoSuchPaddingException,
                                       InvalidKeyException,
                                       IllegalBlockSizeException,
                                       BadPaddingException,
                                       IOException

Encrypts a single File for a single reciever in a simple binary format. This simple binary format basicly looks like this: FILE HEADER|SYMMETRIC ALGORITHM BLOCK HEADER|SYMMETRIC ALGORITHM BLOCK LENGTH|SYMMETRIC ALGORITHM NAME| SYMMETRIC KEY HEADER|SYMMETRIC KEY LENGTH|SYMMETRIC KEY|PAYLOAD

Parameters:

recieversKey - the you wan't to encrypt for

plaintext - the Plaintext, what you want to encrypt

ciphertext - the Ciphertext, where does the encrypted data go to

symmetricAlgorithm - the symmetric algorithm, depends on your security provider

symmStrength - the strength of your choosen symmetric algorithmen depends on both your algorithm and your security provider

Throws:

NoSuchAlgorithmException

NoSuchPaddingException

InvalidKeyException

IllegalBlockSizeException

BadPaddingException

IOException

decryptBinarySimple

public static void decryptBinarySimple(PrivateKey recieversKey,
                                       File ciphertext,
                                       File plaintext)
                                throws IOException,
                                       NoSuchAlgorithmException,
                                       NoSuchPaddingException,
                                       InvalidKeyException,
                                       IllegalBlockSizeException,
                                       BadPaddingException

Decrypts a single File in the simple binary format. This simple binary format basicly looks like this: FILE HEADER|SYMMETRIC ALGORITHM BLOCK HEADER|SYMMETRIC ALGORITHM BLOCK LENGTH|SYMMETRIC ALGORITHM NAME| SYMMETRIC KEY HEADER|SYMMETRIC KEY LENGTH|SYMMETRIC KEY|PAYLOAD

Parameters:

recieversKey - YOUR(?) Private Key to decrypt the symmetric key

ciphertext - where to load the data from

plaintext - where to write the decrypted data to

Throws:

IOException

NoSuchAlgorithmException

NoSuchPaddingException

InvalidKeyException

IllegalBlockSizeException

BadPaddingException

encryptXMLZIP

public static void encryptXMLZIP(X509Certificate[] recieverCerts,
                                 File plaintext,
                                 File ciphertext,
                                 String symmetricAlgorithm,
                                 int symmStrength)
                          throws NoSuchAlgorithmException,
                                 NoSuchPaddingException,
                                 InvalidKeyException,
                                 IOException,
                                 ParserConfigurationException,
                                 IllegalBlockSizeException,
                                 BadPaddingException,
                                 InvalidAlgorithmParameterException

Encrypts a single File for an unlimited* number of recievers. The data is encrypted and packed, together with additional information, in a zip-file. The symmetric algorithm, the asymmetric encrypted symmetric key and the information about the recievers public keys is written to an XML-file which is stored in the zip along with the payload.

Parameters:

recieverCerts -

plaintext -

ciphertext -

symmetricAlgorithm -

symmStrength -

Throws:

NoSuchAlgorithmException

NoSuchPaddingException

InvalidKeyException

IOException

ParserConfigurationException

IllegalBlockSizeException

BadPaddingException - * - some technical restrictions apply.

InvalidAlgorithmParameterException

decryptXMLZIP

public static void decryptXMLZIP(File ciphertext,
                                 File plaintext)
                          throws Exception

Decrypts a file that was decrypted for some private key in our keystore.

Parameters:

ciphertext -

plaintext -

Throws:

Exception

decryptXMLZIP

public static void decryptXMLZIP(PrivateKey privateKey,
                                 File ciphertext,
                                 File plaintext)
                          throws Exception

This class is only meant for unit testing!!!

Parameters:

privateKey -

ciphertext -

plaintext -

Throws:

Exception