anon.crypto
Class AesDecryption

java.lang.Object
  anon.crypto.AesDecryption

public class AesDecryption
extends java.lang.Object

This class is a wrapper for doing AES decryption stuff.

Field Summary

private org.bouncycastle.crypto.engines.AESFastEngine

m_decryptionInstance Stores the used AES decryption algorithm.

Constructor Summary

AesDecryption(byte[] a_aesKey)
Creates a new instance of AesDecryption.

Method Summary

byte[]

decrypt(byte[] a_cipherData) Decrypts one single cipher data block and returns the plain data block.

Methods inherited from class java.lang.Object

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

Field Detail

m_decryptionInstance

private org.bouncycastle.crypto.engines.AESFastEngine m_decryptionInstance

Stores the used AES decryption algorithm.

Constructor Detail

AesDecryption

public AesDecryption(byte[] a_aesKey)
              throws java.lang.Exception

Creates a new instance of AesDecryption. 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

Method Detail

decrypt

public byte[] decrypt(byte[] a_cipherData)
               throws java.lang.Exception

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

Parameters:

a_cipherData - The cipher data block.

Returns:

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

Throws:

java.lang.Exception