anon.tor
Class OnionRouter

java.lang.Object
  anon.tor.OnionRouter

public class OnionRouter
extends java.lang.Object

Author:

stefan

Field Summary

private static org.bouncycastle.crypto.params.DHParameters	DH_PARAMS
private int	m_circID
private MyAES	m_decryptionEngine
private ORDescriptor	m_description
private org.bouncycastle.crypto.agreement.DHBasicAgreement	m_dhe
private org.bouncycastle.crypto.digests.SHA1Digest	m_digestDb
private org.bouncycastle.crypto.digests.SHA1Digest	m_digestDf
private MyAES	m_encryptionEngine
private boolean	m_extended
private OnionRouter	m_nextOR
private static java.math.BigInteger	MAXKEY
private static java.math.BigInteger	MINKEY
private static java.math.BigInteger	SAFEPRIME

Constructor Summary

OnionRouter(int circID, ORDescriptor description)
Constructor

Method Summary

boolean	checkCreatedCell(Cell cell) checks the created cell if the answer was right
boolean	checkExtendedCell(RelayCell cell) checks if the extendedcell has the right parameters and hash
private void	checkExtendParameters(byte[] param, int offset, int len) checks the parameters of a extend cell and calculate the secrets
CreateCell	createConnection() create cell this cell is needed to connect to the first OR.
private byte[]	createExtendOnionSkin() creates the onion skin for a create or extend cell
RelayCell	decryptCell(RelayCell cell) decrypts a RelayCell
RelayCell	encryptCell(RelayCell cell) encrypts a RelayCell
RelayCell	extendConnection(ORDescriptor description) extends the connction to another OR and encrypts the data
private RelayCell	extendConnection(java.lang.String address, int port) extends the connection to another OR
ORDescriptor	getDescription() returns a description of this router

Methods inherited from class java.lang.Object

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

Field Detail

SAFEPRIME

private static final java.math.BigInteger SAFEPRIME

MINKEY

private static final java.math.BigInteger MINKEY

MAXKEY

private static final java.math.BigInteger MAXKEY

DH_PARAMS

private static final org.bouncycastle.crypto.params.DHParameters DH_PARAMS

m_description

private ORDescriptor m_description

m_dhe

private org.bouncycastle.crypto.agreement.DHBasicAgreement m_dhe

m_encryptionEngine

private MyAES m_encryptionEngine

m_decryptionEngine

private MyAES m_decryptionEngine

m_nextOR

private OnionRouter m_nextOR

m_circID

private int m_circID

m_digestDf

private org.bouncycastle.crypto.digests.SHA1Digest m_digestDf

m_digestDb

private org.bouncycastle.crypto.digests.SHA1Digest m_digestDb

m_extended

private boolean m_extended

Constructor Detail

OnionRouter

public OnionRouter(int circID,
                   ORDescriptor description)
            throws java.io.IOException

Constructor

Parameters:

circID - circID of the circuit where it is used

description - ORDescription of the onionrouter

Throws:

java.io.IOException

Method Detail

getDescription

public ORDescriptor getDescription()

returns a description of this router

Returns:

ORDescription

encryptCell

public RelayCell encryptCell(RelayCell cell)
                      throws java.lang.Exception

encrypts a RelayCell

Parameters:

cell - unencrypted cell

Returns:

encrypted cell

Throws:

java.lang.Exception

decryptCell

public RelayCell decryptCell(RelayCell cell)
                      throws java.lang.Exception

decrypts a RelayCell

Parameters:

cell - encrypted cell

Returns:

decrypted cell

Throws:

java.lang.Exception

createConnection

public CreateCell createConnection()
                            throws java.lang.Exception

create cell this cell is needed to connect to the first OR. after the connection is established extendConnection is used

Returns:

createCell

Throws:

java.lang.Exception

checkCreatedCell

public boolean checkCreatedCell(Cell cell)

checks the created cell if the answer was right

Parameters:

cell - createdcell

Throws:

java.lang.Exception

extendConnection

private RelayCell extendConnection(java.lang.String address,
                                   int port)
                            throws java.io.IOException,
                                   org.bouncycastle.crypto.InvalidCipherTextException,
                                   java.lang.Exception

extends the connection to another OR

Parameters:

address - address of the OR

port - port

Returns:

RelayCell with the data that is needed to connect to the new OR

Throws:

java.io.IOException

org.bouncycastle.crypto.InvalidCipherTextException

java.lang.Exception

extendConnection

public RelayCell extendConnection(ORDescriptor description)
                           throws java.io.IOException,
                                  org.bouncycastle.crypto.InvalidCipherTextException,
                                  java.lang.Exception

extends the connction to another OR and encrypts the data

Parameters:

description - ORDescription

Returns:

cell that is needed to extend the connection

Throws:

java.io.IOException

org.bouncycastle.crypto.InvalidCipherTextException

java.lang.Exception

checkExtendedCell

public boolean checkExtendedCell(RelayCell cell)

checks if the extendedcell has the right parameters and hash

Parameters:

cell - cell

Throws:

java.lang.Exception

createExtendOnionSkin

private byte[] createExtendOnionSkin()
                              throws java.io.IOException,
                                     org.bouncycastle.crypto.InvalidCipherTextException,
                                     java.lang.Exception

creates the onion skin for a create or extend cell

Returns:

payload

Throws:

java.io.IOException

org.bouncycastle.crypto.InvalidCipherTextException

java.lang.Exception

checkExtendParameters

private void checkExtendParameters(byte[] param,
                                   int offset,
                                   int len)
                            throws java.lang.Exception

checks the parameters of a extend cell and calculate the secrets

Parameters:

param - parameters

offset - offset of the parameters

len - length of the parameters

Throws:

java.lang.Exception