anon.crypto
Class MyAES

java.lang.Object
  anon.crypto.MyAES

public class MyAES
extends java.lang.Object

This class is a wrapper for doing AES encryption stuff.

Field Summary

private org.bouncycastle.crypto.engines.AESFastEngine	m_AES Stores the used AES encryption algorithm.
private byte[]	m_arCounter Same variables for CTR mode
private byte[]	m_arCounterOut
private int	m_posCTR

Constructor Summary

MyAES()
Creates a new instance of Aes.

Method Summary

void	init(boolean bEncrypt, byte[] a_aesKey) Initialises instance of Aes for encryption or decryption.
void	init(boolean bEncrypt, byte[] a_aesKey, int off, int len) Initialises instance of Aes for encryption or decryption.
byte[]	processBlockECB(byte[] a_plainData) Encrypts/Decrypts one single plain data block and returns the cipher data block.
void	processBlockECB(byte[] a_InData, byte[] a_OutData) Encrypts/Decrypts one single plain data block and returns the cipher data block.
void	processBytesCTR(byte[] in, int inOff, byte[] out, int outOff, int len)

Methods inherited from class java.lang.Object

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

Field Detail

m_AES

private org.bouncycastle.crypto.engines.AESFastEngine m_AES

Stores the used AES encryption algorithm.

m_arCounter

private byte[] m_arCounter

Same variables for CTR mode

m_arCounterOut

private byte[] m_arCounterOut

m_posCTR

private int m_posCTR

Constructor Detail

MyAES

public MyAES()

Creates a new instance of Aes.

Method Detail

init

public void init(boolean bEncrypt,
                 byte[] a_aesKey)
          throws java.lang.Exception

Initialises instance of Aes for encryption or decryption. The size of the key must be 16 bytes (128 bit), 24 bytes (192 bit) or 32 bytes (256 bit). If the key size doesn't fit, an exception is thrown.

Parameters:

a_aesKey - The 128 bit or 192 bit or 256 bit AES key.

Throws:

java.lang.Exception

init

public void init(boolean bEncrypt,
                 byte[] a_aesKey,
                 int off,
                 int len)
          throws java.lang.Exception

Initialises instance of Aes for encryption or decryption. The size of the key must be 16 bytes (128 bit), 24 bytes (192 bit) or 32 bytes (256 bit). If the key size doesn't fit, an exception is thrown.

Parameters:

a_aesKey - The 128 bit or 192 bit or 256 bit AES key.

Throws:

java.lang.Exception

processBlockECB

public void processBlockECB(byte[] a_InData,
                            byte[] a_OutData)
                     throws java.lang.Exception

Encrypts/Decrypts one single plain data block and returns the cipher data block. The blocksize is always 16 bytes (128 bit). If the plain data block is shorter than 16 bytes, an exception is thrown, if it is longer, only the first 16 bytes are encrypted and returned in the cipher block.

Parameters:

a_plainData - The plain data block.

Throws:

java.lang.Exception

processBlockECB

public byte[] processBlockECB(byte[] a_plainData)
                       throws java.lang.Exception

Encrypts/Decrypts one single plain data block and returns the cipher data block. The blocksize is always 16 bytes (128 bit). If the plain data block is shorter than 16 bytes, an exception is thrown, if it is longer, only the first 16 bytes are encrypted and returned in the cipher block.

Parameters:

a_plainData - The plain data block.

Returns:

The cipher data block. The length is always 16 bytes.

Throws:

java.lang.Exception

processBytesCTR

public void processBytesCTR(byte[] in,
                            int inOff,
                            byte[] out,
                            int outOff,
                            int len)
                     throws java.lang.Exception

Throws:

java.lang.Exception