com.iizix.server.client

Class DHKey

java.lang.Object

com.iizix.server.client.DHKey

public class DHKey
extends Object

Class used to generate a 2048 bits key for password transport over unsecured HTTP transactions.

Author:

Christopher Mindus

Constructor Summary

Constructors

Constructor and Description
DHKey() Constructs the instance creating the server's key only.

Method Summary

Modifier and Type	Method and Description
void	assignClientPublicKey(String publicKey) Assigns the Client's public key.
byte[]	decrypt(String clientPublicKey, String encryptedString) Decrypts an encoded string from the client using the two public keys.
static IvParameterSpec	getIvParameterSpec() Gets the IV parameter.
String	getServerPublicKey() Gets the Server's public key.

Methods inherited from class java.lang.Object

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

Constructor Detail

DHKey

public DHKey()

Constructs the instance creating the server's key only. The client "Alice" public key must be provided later.

Method Detail

getIvParameterSpec

public static IvParameterSpec getIvParameterSpec()

Gets the IV parameter.

assignClientPublicKey

public void assignClientPublicKey(String publicKey)

Assigns the Client's public key.

Parameters:

publicKey - The "Alice" public key as a hexadecimal number.

Throws:

IllegalArgumentException - If the public key is invalid.

getServerPublicKey

public String getServerPublicKey()

Gets the Server's public key.

Returns:

The server's public key as a hexadecimal number.

decrypt

public byte[] decrypt(String clientPublicKey,
                      String encryptedString)
               throws InvalidKeyException,
                      InvalidAlgorithmParameterException,
                      NoSuchAlgorithmException,
                      NoSuchPaddingException,
                      IllegalBlockSizeException,
                      BadPaddingException,
                      UnsupportedEncodingException

Decrypts an encoded string from the client using the two public keys.

Parameters:

clientPublicKey - The client public key.

encryptedString - The encrypted string encoded as a Base 64 string.

Returns:

The decrypted string.

Throws:

InvalidAlgorithmParameterException

InvalidKeyException

NoSuchPaddingException

NoSuchAlgorithmException

BadPaddingException

IllegalBlockSizeException

UnsupportedEncodingException