com.sun.faces.renderkit

Class ByteArrayGuard

java.lang.Object

com.sun.faces.renderkit.ByteArrayGuard

public final class ByteArrayGuard
extends Object

This utility class is to provide both encryption and decryption Ciphers to ResponseStateManager implementations wishing to provide encryption support.

The algorithm used to encrypt byte array is AES with CBC.

Original author Inderjeet Singh, J2EE Blue Prints Team. Modified to suit JSF needs.

Constructor Summary

Constructors

Constructor and Description
ByteArrayGuard()

Method Summary

Modifier and Type	Method and Description
byte[]	decrypt(FacesContext facesContext, byte[] bytes) This method decrypts the provided byte array.
byte[]	encrypt(FacesContext facesContext, byte[] bytes) This method: Encrypts bytes using a cipher.

Methods inherited from class java.lang.Object

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

Constructor Detail

ByteArrayGuard

public ByteArrayGuard()

Method Detail

encrypt

public byte[] encrypt(FacesContext facesContext,
                      byte[] bytes)

This method: Encrypts bytes using a cipher. Generates MAC for intialization vector of the cipher Generates MAC for encrypted data Returns a byte array consisting of the following concatenated together: |MAC for cnrypted Data | MAC for Init Vector | Encrypted Data |

Parameters:

bytes - The byte array to be encrypted.

Returns:

the encrypted byte array.

decrypt

public byte[] decrypt(FacesContext facesContext,
                      byte[] bytes)

This method decrypts the provided byte array. The decryption is only performed if the regenerated MAC is the same as the MAC for the received value.

Parameters:

bytes - Encrypted byte array to be decrypted.

Returns:

Decrypted byte array.