org.bouncycastle.crypto.engines

Class HC256Engine

public class HC256Engine extends Object implements StreamCipher

HC-256 is a software-efficient stream cipher created by Hongjun Wu. It generates keystream from a 256-bit secret key and a 256-bit initialization vector.

http://www.ecrypt.eu.org/stream/p3ciphers/hc/hc256_p3.pdf

Its brother, HC-128, is a third phase candidate in the eStream contest. The algorithm is patent-free. No attacks are known as of today (April 2007). See http://www.ecrypt.eu.org/stream/hcp3.html

Method Summary
StringgetAlgorithmName()
voidinit(boolean forEncryption, CipherParameters params)
Initialise a HC-256 cipher.
voidprocessBytes(byte[] in, int inOff, int len, byte[] out, int outOff)
voidreset()
bytereturnByte(byte in)

Method Detail

getAlgorithmName

public String getAlgorithmName()

init

public void init(boolean forEncryption, CipherParameters params)
Initialise a HC-256 cipher.

Parameters: forEncryption whether or not we are for encryption. Irrelevant, as encryption and decryption are the same. params the parameters required to set up the cipher.

Throws: IllegalArgumentException if the params argument is inappropriate (ie. the key is not 256 bit long).

processBytes

public void processBytes(byte[] in, int inOff, int len, byte[] out, int outOff)

reset

public void reset()

returnByte

public byte returnByte(byte in)