org.universAAL.middleware.connectors.communication.jgroups.util
Class CryptUtil

java.lang.Object
  org.universAAL.middleware.connectors.communication.jgroups.util.CryptUtil

public class CryptUtil
extends Object

A utility class for managing private/public keys and encrypting/decrypting strings

Author:

mtazari - Saied Tazari

Constructor Summary

CryptUtil()

Method Summary

static String	decrypt(String cipher) decrypt the parameter string with the shared key read during initialization
static String	encrypt(String clear) encrypt the parameter string with the shared key read during initialization
void	generateKeyPair() generate a pair of keys - public and private, and write them to the files with the names "public.key" and "private.key"
static String	init(String dir, Codec codec) Initialization method - reads the shared key from the file system or generates a new shared key

Methods inherited from class java.lang.Object

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

Constructor Detail

CryptUtil

public CryptUtil()

Method Detail

init

public static String init(String dir,
                          Codec codec)
                   throws Exception

Initialization method - reads the shared key from the file system or generates a new shared key

Parameters:

String - dir - the directory where the shared key file resides

codec - the codec to be used for encoding and decoding messages (e.g. Base64)

Throws:

Exception

decrypt

public static String decrypt(String cipher)
                      throws Exception

decrypt the parameter string with the shared key read during initialization

Parameters:

String - chiper - the string to decrypt

Returns:

the decrypted string

Throws:

Exception

encrypt

public static String encrypt(String clear)
                      throws Exception

encrypt the parameter string with the shared key read during initialization

Parameters:

String - clear - the string to encrypt

Returns:

the encrypted string

Throws:

Exception

generateKeyPair

public void generateKeyPair()
                     throws Exception

generate a pair of keys - public and private, and write them to the files with the names "public.key" and "private.key"

Throws:

Exception