net.happybrackets.core

Class Encryption

java.lang.Object

net.happybrackets.core.Encryption

public class Encryption
extends java.lang.Object

Utility methods to encrypt and decrypt data. Based on http://stackoverflow.com/a/992413

Constructor Summary

Constructors

Constructor and Description
Encryption()

Method Summary

Modifier and Type	Method and Description
static byte[]	decrypt(java.lang.String key, byte[] input, int offset, int length) Decrypt the given data.
static byte[][]	encrypt(java.lang.String key, byte[] input, int offset, int length) Encrypt the given data.
static int	getIVLength()

Methods inherited from class java.lang.Object

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

Constructor Detail

Encryption

public Encryption()

Method Detail

getIVLength

public static int getIVLength()

Returns:

The length in bytes of the initialisation vector generated by encrypt(String, byte[], int, int).

encrypt

public static byte[][] encrypt(java.lang.String key,
                               byte[] input,
                               int offset,
                               int length)
                        throws java.lang.Exception

Encrypt the given data.

Parameters:

key - A user-supplied password/key.

input - The data to encrypt.

offset - The offset into the data to encrypt.

length - The length of the data to encrypt, from offset.

Returns:

The initialisation vector (index 0) and the encrypted data (index 1).

Throws:

java.lang.Exception - Encryption error

decrypt

public static byte[] decrypt(java.lang.String key,
                             byte[] input,
                             int offset,
                             int length)
                      throws java.lang.Exception

Decrypt the given data.

Parameters:

key - A user-supplied password/key.

input - The data to decrypt, prefixed with the initialisation vector (IV).

offset - The offset into the data to decrypt (starting at IV).

length - The length of the data to encrypt, from offset (NOT including length of IV).

Returns:

The decrypted data.

Throws:

java.lang.Exception - Encryption error