anon.client.crypto

Class FirstMixCipher

java.lang.Object

anon.client.crypto.FirstMixCipher

All Implemented Interfaces:

IMixCipher

public class FirstMixCipher
extends java.lang.Object
implements IMixCipher

Author:

Stefan Lieske

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
private class	FirstMixCipher.MixEncryptionHandler

Field Summary

Fields

Modifier and Type	Field and Description
private ISymCipher	m_channelSymCipher
private boolean	m_firstEncryptionPacket
private ISymCipher	m_mixCipher

Constructor Summary

Constructors

Constructor and Description
FirstMixCipher(ISymCipher a_mixCipher, ISymCipher a_channelSymCipher)

Method Summary

Modifier and Type	Method and Description
boolean	decrypt(byte[] a_packet) Decrypts the given byte array and saves the result in place.
byte[]	encrypt(byte[] a_packet, int a_virtualPacketLength, java.util.Vector a_sendCallbackHandlers) Encrypts a byte array using the underlying encryption algorithm for that mix.
int	getNextPacketEncryptionOverhead() Returns the overhead an encryption operation with this mix brings with it.

Methods inherited from class java.lang.Object

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

Field Detail

m_firstEncryptionPacket

private boolean m_firstEncryptionPacket

m_mixCipher

private ISymCipher m_mixCipher

m_channelSymCipher

private ISymCipher m_channelSymCipher

Constructor Detail

FirstMixCipher

public FirstMixCipher(ISymCipher a_mixCipher,
                      ISymCipher a_channelSymCipher)

Method Detail

encrypt

public byte[] encrypt(byte[] a_packet,
                      int a_virtualPacketLength,
                      java.util.Vector a_sendCallbackHandlers)

Description copied from interface: IMixCipher

Encrypts a byte array using the underlying encryption algorithm for that mix. The given callback handlers will be called, when the packet was successfully encrypted.

Specified by:

encrypt in interface IMixCipher

Parameters:

a_packet - The byte array to be encrypted.

a_virtualPacketLength - The minimal length of the resulting packet.

Returns:

A byte array containing the result of the encryption, possibly padded with random bytes until a_virtualPacketLength bytes long.

decrypt

public boolean decrypt(byte[] a_packet)

Description copied from interface: IMixCipher

Decrypts the given byte array and saves the result in place.

Specified by:

decrypt in interface IMixCipher

Returns:

true, if no errors occurred (including integrity checks)

getNextPacketEncryptionOverhead

public int getNextPacketEncryptionOverhead()

Description copied from interface: IMixCipher

Returns the overhead an encryption operation with this mix brings with it. This can change depending on if the message to be encrypted will be the first one (keys have to be sent, etc).

Specified by:

getNextPacketEncryptionOverhead in interface IMixCipher

Returns:

Number of bytes needed as overhead.