org.spongycastle.crypto.engines

Class SerpentEngine

java.lang.Object

org.spongycastle.crypto.engines.SerpentEngineBase

org.spongycastle.crypto.engines.SerpentEngine

All Implemented Interfaces:

BlockCipher

public final class SerpentEngine
extends SerpentEngineBase

Serpent is a 128-bit 32-round block cipher with variable key lengths, including 128, 192 and 256 bit keys conjectured to be at least as secure as three-key triple-DES.

Serpent was designed by Ross Anderson, Eli Biham and Lars Knudsen as a candidate algorithm for the NIST AES Quest.

For full details see The Serpent home page

Field Summary

Fields inherited from class org.spongycastle.crypto.engines.SerpentEngineBase

BLOCK_SIZE, encrypting, wKey, X0, X1, X2, X3

Constructor Summary

Constructors

Constructor and Description
SerpentEngine()

Method Summary

Modifier and Type	Method and Description
protected void	decryptBlock(byte[] input, int inOff, byte[] output, int outOff) Decrypt one block of ciphertext.
protected void	encryptBlock(byte[] input, int inOff, byte[] output, int outOff) Encrypt one block of plaintext.
protected int[]	makeWorkingKey(byte[] key) Expand a user-supplied key material into a session key.

Methods inherited from class org.spongycastle.crypto.engines.SerpentEngineBase

getAlgorithmName, getBlockSize, ib0, ib1, ib2, ib3, ib4, ib5, ib6, ib7, init, inverseLT, LT, processBlock, reset, rotateLeft, rotateRight, sb0, sb1, sb2, sb3, sb4, sb5, sb6, sb7

Methods inherited from class java.lang.Object

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

Constructor Detail

SerpentEngine

public SerpentEngine()

Method Detail

makeWorkingKey

protected int[] makeWorkingKey(byte[] key)
                        throws java.lang.IllegalArgumentException

Expand a user-supplied key material into a session key.

Specified by:

makeWorkingKey in class SerpentEngineBase

Parameters:

key - The user-key bytes (multiples of 4) to use.

Throws:

java.lang.IllegalArgumentException

encryptBlock

protected void encryptBlock(byte[] input,
                            int inOff,
                            byte[] output,
                            int outOff)

Encrypt one block of plaintext.

Specified by:

encryptBlock in class SerpentEngineBase

Parameters:

input - the array containing the input data.

inOff - offset into the in array the data starts at.

output - the array the output data will be copied into.

outOff - the offset into the out array the output will start at.

decryptBlock

protected void decryptBlock(byte[] input,
                            int inOff,
                            byte[] output,
                            int outOff)

Decrypt one block of ciphertext.

Specified by:

decryptBlock in class SerpentEngineBase

Parameters:

input - the array containing the input data.

inOff - offset into the in array the data starts at.

output - the array the output data will be copied into.

outOff - the offset into the out array the output will start at.