ComPackage

Class Client

java.lang.Object

ComPackage.Client

public class Client
extends java.lang.Object

Class for invocation methods on server

Author:

Bc. Jan Kislinger

Constructor Summary

Constructors

Constructor and Description
Client()

Method Summary

Methods

Modifier and Type	Method and Description
static void	clickClose(java.lang.String un) Remove user from server.
static boolean	createChal(java.math.BigInteger b, java.lang.String info, java.lang.String message) Creates challenge.
static void	createUser(java.lang.String un) Creates new user and register on server.
static byte[]	digToKey(byte[] dig) Transfers key from length of hash to length of cipher.
static java.lang.String	getCip() Gets type of cipher function and check correctness.
static java.lang.String	getHash() Gets type of hash function and check correctness.
static javax.crypto.SecretKey	getKey(Challenge chal) Gets cipher key.
static javax.crypto.SecretKey	getKeyFromNum(java.security.MessageDigest dig, java.lang.String ciph, java.math.BigInteger num) Hashs input number to secret key.
static java.lang.String	getMess(byte[] cm, java.math.BigInteger f, java.lang.String Shash, java.lang.String Scip) Gets message from crypted message.
static java.util.LinkedList<User>	getUsers() Gets list of usernames.
static boolean	checkCon() Checks connetion to server.
static Challenge	checkChall() Check challenges - gets list of challenges and checks which is destined for user.
static java.math.BigInteger	checkSign(java.lang.String dk, java.lang.String Shash) Checks signature of key.
static boolean	checkUN(java.lang.String un) Checks identical usernames.
static void	referenceToServer() Gets reference from the Name Service.
static byte[]	verif(Challenge chal, java.math.BigInteger f) Verification of user - computes Kmacc key and creates response which sends to server for verification.

Methods inherited from class java.lang.Object

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

Constructor Detail

Client

public Client()

Method Detail

referenceToServer

public static void referenceToServer()

Gets reference from the Name Service.

checkCon

public static boolean checkCon()
                        throws java.rmi.RemoteException

Checks connetion to server.

Returns:

if connection is right - return true, else false

Throws:

java.rmi.RemoteException

checkUN

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

Checks identical usernames.

Parameters:

un - username to check

Returns:

if username is identical - return true, else false

Throws:

java.rmi.RemoteException

createUser

public static void createUser(java.lang.String un)
                       throws java.rmi.RemoteException,
                              java.security.NoSuchAlgorithmException

Creates new user and register on server.

Parameters:

un - username

Throws:

java.rmi.RemoteException

java.security.NoSuchAlgorithmException

getHash

public static java.lang.String getHash()

Gets type of hash function and check correctness.

Returns:

hash

getCip

public static java.lang.String getCip()

Gets type of cipher function and check correctness.

Returns:

cipher

getUsers

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

Gets list of usernames.

Returns:

list of usernames

Throws:

java.rmi.RemoteException

createChal

public static boolean createChal(java.math.BigInteger b,
                 java.lang.String info,
                 java.lang.String message)
                          throws java.security.NoSuchAlgorithmException,
                                 javax.crypto.NoSuchPaddingException,
                                 java.rmi.RemoteException,
                                 java.security.InvalidKeyException,
                                 javax.crypto.IllegalBlockSizeException,
                                 javax.crypto.BadPaddingException,
                                 java.security.NoSuchProviderException

Creates challenge.

Parameters:

b - receiver's public key

info - string info

message - string message

Returns:

if creation of challenge is right then return true

Throws:

java.security.NoSuchAlgorithmException

javax.crypto.NoSuchPaddingException

java.rmi.RemoteException

java.security.InvalidKeyException

javax.crypto.IllegalBlockSizeException

javax.crypto.BadPaddingException

java.security.NoSuchProviderException

checkChall

public static Challenge checkChall()
                            throws java.rmi.RemoteException,
                                   java.security.NoSuchAlgorithmException,
                                   java.security.NoSuchProviderException

Check challenges - gets list of challenges and checks which is destined for user.

Returns:

challenge for user or empty challenge

Throws:

java.rmi.RemoteException

java.security.NoSuchAlgorithmException

java.security.NoSuchProviderException

getKey

public static javax.crypto.SecretKey getKey(Challenge chal)
                                     throws java.security.NoSuchAlgorithmException,
                                            javax.crypto.NoSuchPaddingException,
                                            java.security.InvalidKeyException,
                                            javax.crypto.IllegalBlockSizeException,
                                            javax.crypto.BadPaddingException,
                                            java.rmi.RemoteException,
                                            java.security.NoSuchProviderException

Gets cipher key.

Parameters:

chal - challenge

Returns:

cipher key

Throws:

java.security.NoSuchAlgorithmException

javax.crypto.NoSuchPaddingException

java.security.InvalidKeyException

javax.crypto.IllegalBlockSizeException

javax.crypto.BadPaddingException

java.rmi.RemoteException

java.security.NoSuchProviderException

checkSign

public static java.math.BigInteger checkSign(java.lang.String dk,
                             java.lang.String Shash)
                                      throws java.security.NoSuchAlgorithmException,
                                             java.rmi.RemoteException

Checks signature of key.

Parameters:

dk - decrypted key

Shash - type of sender's hashs function

Returns:

if signature is valid then return key, else 0

Throws:

java.security.NoSuchAlgorithmException

java.rmi.RemoteException

verif

public static byte[] verif(Challenge chal,
           java.math.BigInteger f)
                    throws java.rmi.RemoteException,
                           java.security.NoSuchAlgorithmException,
                           javax.crypto.NoSuchPaddingException,
                           java.security.InvalidKeyException,
                           javax.crypto.IllegalBlockSizeException,
                           javax.crypto.BadPaddingException,
                           java.security.NoSuchProviderException

Verification of user - computes Kmacc key and creates response which sends to server for verification.

Parameters:

chal - challenge

f - verification key

Returns:

if verification is right then return crypted message, else error message

Throws:

java.rmi.RemoteException

java.security.NoSuchAlgorithmException

javax.crypto.NoSuchPaddingException

java.security.InvalidKeyException

javax.crypto.IllegalBlockSizeException

javax.crypto.BadPaddingException

java.security.NoSuchProviderException

getMess

public static java.lang.String getMess(byte[] cm,
                       java.math.BigInteger f,
                       java.lang.String Shash,
                       java.lang.String Scip)
                                throws java.security.InvalidKeyException,
                                       java.security.NoSuchAlgorithmException,
                                       javax.crypto.NoSuchPaddingException,
                                       javax.crypto.IllegalBlockSizeException,
                                       javax.crypto.BadPaddingException

Gets message from crypted message.

Parameters:

cm - crypted message

f - verification key

Shash - type of sender's hashs function

Scip - type of sender's cipher function

Returns:

message

Throws:

java.security.InvalidKeyException

java.security.NoSuchAlgorithmException

javax.crypto.NoSuchPaddingException

javax.crypto.IllegalBlockSizeException

javax.crypto.BadPaddingException

clickClose

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

Remove user from server.

Parameters:

un - username

Throws:

java.rmi.RemoteException

getKeyFromNum

public static javax.crypto.SecretKey getKeyFromNum(java.security.MessageDigest dig,
                                   java.lang.String ciph,
                                   java.math.BigInteger num)

Hashs input number to secret key.

Parameters:

dig - message digest

ciph - typ of cipher function

num - input number

Returns:

challenge for user or empty challenge

digToKey

public static byte[] digToKey(byte[] dig)

Transfers key from length of hash to length of cipher.

Returns:

key with right length