ComPackage

Class ComImpl

java.lang.Object

javax.rmi.PortableRemoteObject

ComPackage.ComImpl

All Implemented Interfaces:

ComInterface, java.rmi.Remote

public class ComImpl
extends javax.rmi.PortableRemoteObject
implements ComInterface

Class for implementation an interface which is promising that it will provide method bodies, or definitions, for each of the method signatures declared in that interface.

Author:

Bc. Jan Kislinger

Constructor Summary

Constructors

Constructor and Description
ComImpl() Constructor - invoke rmi linking and remote object initialization.

Method Summary

Methods

Modifier and Type	Method and Description
void	addUser(java.lang.String un, java.math.BigInteger vk) Adds new user.
boolean	createChallenge(java.math.BigInteger xe, java.math.BigInteger ff, byte[] cm, byte[] ck, java.lang.String info, java.lang.String hash, java.lang.String cip) Creates challenge and crypted message on the server.
byte[]	digToKey(byte[] dig) Transfers key from length of hash to length of cipher.
java.util.Collection<Challenge>	getChallenges() Gets list of challenges.
int	getID(java.lang.String un) Gets user identification from username.
java.util.LinkedList<User>	getListOfUsers() Gets list of usernames.
boolean	checkConnection() Checks connection to server.
boolean	checkUsername(java.lang.String un) Checks identical usernames.
java.math.BigInteger[]	receivePGQ() Gets public parameters 'p', 'q' and 'g'.
void	removeUser(java.lang.String un) Removes user.
byte[]	verification(int id, byte[] oo) Verifications of user - computes Kmac key and creates response which is compared with client's response.

Methods inherited from class javax.rmi.PortableRemoteObject

connect, exportObject, narrow, toStub, unexportObject

Methods inherited from class java.lang.Object

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

Constructor Detail

ComImpl

public ComImpl()
        throws java.rmi.RemoteException

Constructor - invoke rmi linking and remote object initialization.

Throws:

java.rmi.RemoteException

Method Detail

getID

public int getID(java.lang.String un)

Gets user identification from username.

Parameters:

un - username

Returns:

user identification

checkConnection

public boolean checkConnection()
                        throws java.rmi.RemoteException

Checks connection to server.

Specified by:

checkConnection in interface ComInterface

Returns:

true

Throws:

java.rmi.RemoteException

checkUsername

public boolean checkUsername(java.lang.String un)
                      throws java.rmi.RemoteException

Checks identical usernames.

Specified by:

checkUsername in interface ComInterface

Parameters:

un - username to check

Returns:

if username is identical - return true, else false

Throws:

java.rmi.RemoteException

receivePGQ

public java.math.BigInteger[] receivePGQ()
                                  throws java.rmi.RemoteException

Gets public parameters 'p', 'q' and 'g'.

Specified by:

receivePGQ in interface ComInterface

Returns:

array of big integers, [0] = p, [1] = g and [2] = q

Throws:

java.rmi.RemoteException

addUser

public void addUser(java.lang.String un,
           java.math.BigInteger vk)
             throws java.rmi.RemoteException,
                    java.security.NoSuchAlgorithmException

Adds new user.

Specified by:

addUser in interface ComInterface

Parameters:

un - username

vk - public key

Throws:

java.rmi.RemoteException

java.security.NoSuchAlgorithmException

getListOfUsers

public java.util.LinkedList<User> getListOfUsers()
                                          throws java.rmi.RemoteException

Gets list of usernames.

Specified by:

getListOfUsers in interface ComInterface

Returns:

list of usernames

Throws:

java.rmi.RemoteException

createChallenge

public boolean createChallenge(java.math.BigInteger xe,
                      java.math.BigInteger ff,
                      byte[] cm,
                      byte[] ck,
                      java.lang.String info,
                      java.lang.String hash,
                      java.lang.String cip)
                        throws java.rmi.RemoteException,
                               java.security.NoSuchAlgorithmException

Creates challenge and crypted message on the server.

Specified by:

createChallenge in interface ComInterface

Parameters:

xe - xe parameter

ff - ff parameter

cm - crypted message

ck - crypted key

info - string info

hash - type of hashs function

cip - type of ciphers function

Returns:

if creation of challenge is right then return true

Throws:

java.rmi.RemoteException

java.security.NoSuchAlgorithmException

getChallenges

public java.util.Collection<Challenge> getChallenges()
                                              throws java.rmi.RemoteException

Gets list of challenges.

Specified by:

getChallenges in interface ComInterface

Returns:

list of challenges

Throws:

java.rmi.RemoteException

verification

public byte[] verification(int id,
                  byte[] oo)
                    throws java.security.NoSuchAlgorithmException,
                           javax.crypto.NoSuchPaddingException,
                           java.security.InvalidKeyException,
                           javax.crypto.IllegalBlockSizeException,
                           javax.crypto.BadPaddingException

Verifications of user - computes Kmac key and creates response which is compared with client's response.

Specified by:

verification in interface ComInterface

Parameters:

id - identification of challenge

oo - response

Returns:

if verification is right return crypted message, else error message

Throws:

java.security.NoSuchAlgorithmException

javax.crypto.NoSuchPaddingException

java.security.InvalidKeyException

javax.crypto.IllegalBlockSizeException

javax.crypto.BadPaddingException

removeUser

public void removeUser(java.lang.String un)
                throws java.rmi.RemoteException

Removes user.

Specified by:

removeUser in interface ComInterface

Parameters:

un - username

Throws:

java.rmi.RemoteException

digToKey

public byte[] digToKey(byte[] dig)

Transfers key from length of hash to length of cipher.

Returns:

key with right length