Package de.qytera.qtaf.security.aes

Class AES

java.lang.Object

de.qytera.qtaf.security.aes.AES

public class AES
extends Object

Class that provides methods for encryption and decryption with the AES algorithm

Method Summary

Modifier and Type	Method	Description
static SecretKeySpec	createAESKey(char[] passphrase, byte[] salt)	Creates a secret cryptographic AES key from a given passphrase and a salt.
static String	decrypt(String ciphertext, String key)	Decrypts an AES-encrypted ciphertext using the provided passphrase.
static String	encrypt(String plainText, String key)	Encrypts string content using the provided passphrase.
static String	encrypt(String plainText, String key, byte[] salt)	Encrypts string content using the provided passphrase.

Methods inherited from class java.lang.Object

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

Method Details

encrypt

public static String encrypt(String plainText,
 String key)
                      throws GeneralSecurityException

Encrypts string content using the provided passphrase.

Parameters:

plainText - the plaintext that should be encrypted

key - the AES secret key

Returns:

the encrypted ciphertext

Throws:

GeneralSecurityException - whenever encryption fails

encrypt

public static String encrypt(String plainText,
 String key,
 byte[] salt)
                      throws GeneralSecurityException

Encrypts string content using the provided passphrase.

Parameters:

plainText - the plaintext that should be encrypted

key - the AES secret key

salt - the salt

Returns:

the encrypted ciphertext

Throws:

GeneralSecurityException - whenever encryption fails

decrypt

public static String decrypt(String ciphertext,
 String key)
                      throws GeneralSecurityException

Decrypts an AES-encrypted ciphertext using the provided passphrase.

Parameters:

ciphertext - the AES ciphertext

key - the AES secret key

Returns:

the decrypted plaintext

Throws:

GeneralSecurityException - whenever decryption fails

createAESKey

public static SecretKeySpec createAESKey(char[] passphrase,
 byte[] salt)
                                  throws NoSuchAlgorithmException,
InvalidKeySpecException

Creates a secret cryptographic AES key from a given passphrase and a salt.

Parameters:

passphrase - the passphrase to base the key on

salt - the salt to use

Returns:

a corresponding, secret AES key

Throws:

NoSuchAlgorithmException - if the factory used for creating the key does not know the PBE algorithm

InvalidKeySpecException - if the given key specification is inappropriate for this secret-key factory to produce a secret key