org.spongycastle.crypto.engines

Class TnepresEngine

java.lang.Object

org.spongycastle.crypto.engines.SerpentEngineBase

org.spongycastle.crypto.engines.TnepresEngine

All Implemented Interfaces:

BlockCipher

public final class TnepresEngine
extends SerpentEngineBase

Tnepres 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.

Tnepres is based on Serpent which was designed by Ross Anderson, Eli Biham and Lars Knudsen as a candidate algorithm for the NIST AES Quest. Unfortunately there was an endianness issue with test vectors in the AES submission and the resulting confusion lead to the Tnepres cipher as well, which is a byte swapped version of Serpent.

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
TnepresEngine()

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.
java.lang.String	getAlgorithmName() Return the name of the algorithm the cipher implements.
protected int[]	makeWorkingKey(byte[] key) Expand a user-supplied key material into a session key.

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

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

TnepresEngine

public TnepresEngine()

Method Detail

getAlgorithmName

public java.lang.String getAlgorithmName()

Description copied from interface: BlockCipher

Return the name of the algorithm the cipher implements.

Specified by:

getAlgorithmName in interface BlockCipher

Overrides:

getAlgorithmName in class SerpentEngineBase

Returns:

the name of the algorithm the cipher implements.

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.