es.rediris.crypt
Class AESTool

java.lang.Object
  es.rediris.crypt.AESTool

public class AESTool
extends Object

AESTool is a helper class for encrypting/decrypting messages using AES algorithm in ECB mode. Also, it uses PKCS5 padding when makes its operations with messages.
Keys are 128-bit, 192-bit or 256-bit blocks, and you have to associate a name for their. So, when you encrypt/decrypt you have to specify which key (through its name) you want to use.

Constructor Summary

AESTool()
Generate an AESTool object

Method Summary

boolean	addKey(String name, byte[] key) Add a valid key setting its name.
void	clearKeys() Delete all added keys
String	decode(String nameKey, String data) Decrypt a message using the specified key
boolean	delKey(String name) Delete a previously added key
String	encode(String nameKey, String data) Encrypt a message using the specified key.
byte[]	getKey(String name)
String[]	getNameKeys() Get an array with the name of all added keys
boolean	hasKey(String nameKey)

Methods inherited from class java.lang.Object

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

Constructor Detail

AESTool

public AESTool()

Generate an AESTool object

Method Detail

addKey

public boolean addKey(String name,
                      byte[] key)

Add a valid key setting its name.

Parameters:

name - The name of the key

key - The array of bytes defining the key

Returns:

true if the key is valid and it wasn't previously added, false in other case

delKey

public boolean delKey(String name)

Delete a previously added key

Parameters:

name - The name of the key

Returns:

true if it has removed, false in other case

clearKeys

public void clearKeys()

Delete all added keys

getNameKeys

public String[] getNameKeys()

Get an array with the name of all added keys

Returns:

An array with their names

getKey

public byte[] getKey(String name)

encode

public String encode(String nameKey,
                     String data)

Encrypt a message using the specified key.

Parameters:

nameKey - The name of the key you want to use

data - The message you want to encrypt

Returns:

The ciphered message in base 64, or null if it has happened any error encrypting

decode

public String decode(String nameKey,
                     String data)

Decrypt a message using the specified key

Parameters:

nameKey - The name of the key you want to use

data - The ciphered message in base 64

Returns:

The "plain" message, or null if it has happened any error

hasKey

public boolean hasKey(String nameKey)