org.spongycastle.crypto.engines

Class SerpentEngineBase

java.lang.Object

org.spongycastle.crypto.engines.SerpentEngineBase

All Implemented Interfaces:

BlockCipher

Direct Known Subclasses:

SerpentEngine, TnepresEngine

public abstract class SerpentEngineBase
extends java.lang.Object
implements BlockCipher

Field Summary

Fields

Modifier and Type	Field and Description
protected static int	BLOCK_SIZE
protected boolean	encrypting
protected int[]	wKey
protected int	X0
protected int	X1
protected int	X2
protected int	X3

Method Summary

Modifier and Type	Method and Description
protected abstract void	decryptBlock(byte[] input, int inOff, byte[] output, int outOff)
protected abstract void	encryptBlock(byte[] input, int inOff, byte[] output, int outOff)
java.lang.String	getAlgorithmName() Return the name of the algorithm the cipher implements.
int	getBlockSize() Return the block size for this cipher (in bytes).
protected void	ib0(int a, int b, int c, int d) InvSO - {13, 3,11, 0,10, 6, 5,12, 1,14, 4, 7,15, 9, 8, 2 } - 15 terms.
protected void	ib1(int a, int b, int c, int d) InvS1 - { 5, 8, 2,14,15, 6,12, 3,11, 4, 7, 9, 1,13,10, 0 } - 14 steps.
protected void	ib2(int a, int b, int c, int d) InvS2 - {12, 9,15, 4,11,14, 1, 2, 0, 3, 6,13, 5, 8,10, 7 } - 16 steps.
protected void	ib3(int a, int b, int c, int d) InvS3 - { 0, 9,10, 7,11,14, 6,13, 3, 5,12, 2, 4, 8,15, 1 } - 15 terms
protected void	ib4(int a, int b, int c, int d) InvS4 - { 5, 0, 8, 3,10, 9, 7,14, 2,12,11, 6, 4,15,13, 1 } - 15 terms.
protected void	ib5(int a, int b, int c, int d) InvS5 - { 8,15, 2, 9, 4, 1,13,14,11, 6, 5, 3, 7,12,10, 0 } - 16 terms.
protected void	ib6(int a, int b, int c, int d) InvS6 - {15,10, 1,13, 5, 3, 6, 0, 4, 9,14, 7, 2,12, 8,11 } - 15 terms.
protected void	ib7(int a, int b, int c, int d) InvS7 - { 3, 0, 6,13, 9,14,15, 8, 5,12,11, 7,10, 1, 4, 2 } - 17 terms.
void	init(boolean encrypting, CipherParameters params) initialise a Serpent cipher.
protected void	inverseLT() Apply the inverse of the linear transformation to the register set.
protected void	LT() Apply the linear transformation to the register set.
protected abstract int[]	makeWorkingKey(byte[] key)
int	processBlock(byte[] in, int inOff, byte[] out, int outOff) Process one block of input from the array in and write it to the out array.
void	reset() Reset the cipher.
protected static int	rotateLeft(int x, int bits)
protected static int	rotateRight(int x, int bits)
protected void	sb0(int a, int b, int c, int d) S0 - { 3, 8,15, 1,10, 6, 5,11,14,13, 4, 2, 7, 0, 9,12 } - 15 terms.
protected void	sb1(int a, int b, int c, int d) S1 - {15,12, 2, 7, 9, 0, 5,10, 1,11,14, 8, 6,13, 3, 4 } - 14 terms.
protected void	sb2(int a, int b, int c, int d) S2 - { 8, 6, 7, 9, 3,12,10,15,13, 1,14, 4, 0,11, 5, 2 } - 16 terms.
protected void	sb3(int a, int b, int c, int d) S3 - { 0,15,11, 8,12, 9, 6, 3,13, 1, 2, 4,10, 7, 5,14 } - 16 terms.
protected void	sb4(int a, int b, int c, int d) S4 - { 1,15, 8, 3,12, 0,11, 6, 2, 5, 4,10, 9,14, 7,13 } - 15 terms.
protected void	sb5(int a, int b, int c, int d) S5 - {15, 5, 2,11, 4,10, 9,12, 0, 3,14, 8,13, 6, 7, 1 } - 16 terms.
protected void	sb6(int a, int b, int c, int d) S6 - { 7, 2,12, 5, 8, 4, 6,11,14, 9, 1,15,13, 3,10, 0 } - 15 terms.
protected void	sb7(int a, int b, int c, int d) S7 - { 1,13,15, 0,14, 8, 2,11, 7, 4,12,10, 9, 3, 5, 6 } - 16 terms.

Methods inherited from class java.lang.Object

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

Field Detail

BLOCK_SIZE

protected static final int BLOCK_SIZE

See Also:

Constant Field Values

encrypting

protected boolean encrypting

wKey

protected int[] wKey

X0

protected int X0

X1

protected int X1

X2

protected int X2

X3

protected int X3

Method Detail

init

public void init(boolean encrypting,
                 CipherParameters params)

initialise a Serpent cipher.

Specified by:

init in interface BlockCipher

Parameters:

encrypting - whether or not we are for encryption.

params - the parameters required to set up the cipher.

Throws:

java.lang.IllegalArgumentException - if the params argument is inappropriate.

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

Returns:

the name of the algorithm the cipher implements.

getBlockSize

public int getBlockSize()

Description copied from interface: BlockCipher

Return the block size for this cipher (in bytes).

Specified by:

getBlockSize in interface BlockCipher

Returns:

the block size for this cipher in bytes.

processBlock

public final int processBlock(byte[] in,
                              int inOff,
                              byte[] out,
                              int outOff)

Process one block of input from the array in and write it to the out array.

Specified by:

processBlock in interface BlockCipher

Parameters:

in - the array containing the input data.

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

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

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

Returns:

the number of bytes processed and produced.

Throws:

DataLengthException - if there isn't enough data in in, or space in out.

java.lang.IllegalStateException - if the cipher isn't initialised.

reset

public void reset()

Description copied from interface: BlockCipher

Reset the cipher. After resetting the cipher is in the same state as it was after the last init (if there was one).

Specified by:

reset in interface BlockCipher

rotateLeft

protected static int rotateLeft(int x,
                                int bits)

rotateRight

protected static int rotateRight(int x,
                                 int bits)

sb0

protected final void sb0(int a,
                         int b,
                         int c,
                         int d)

S0 - { 3, 8,15, 1,10, 6, 5,11,14,13, 4, 2, 7, 0, 9,12 } - 15 terms.

ib0

protected final void ib0(int a,
                         int b,
                         int c,
                         int d)

InvSO - {13, 3,11, 0,10, 6, 5,12, 1,14, 4, 7,15, 9, 8, 2 } - 15 terms.

sb1

protected final void sb1(int a,
                         int b,
                         int c,
                         int d)

S1 - {15,12, 2, 7, 9, 0, 5,10, 1,11,14, 8, 6,13, 3, 4 } - 14 terms.

ib1

protected final void ib1(int a,
                         int b,
                         int c,
                         int d)

InvS1 - { 5, 8, 2,14,15, 6,12, 3,11, 4, 7, 9, 1,13,10, 0 } - 14 steps.

sb2

protected final void sb2(int a,
                         int b,
                         int c,
                         int d)

S2 - { 8, 6, 7, 9, 3,12,10,15,13, 1,14, 4, 0,11, 5, 2 } - 16 terms.

ib2

protected final void ib2(int a,
                         int b,
                         int c,
                         int d)

InvS2 - {12, 9,15, 4,11,14, 1, 2, 0, 3, 6,13, 5, 8,10, 7 } - 16 steps.

sb3

protected final void sb3(int a,
                         int b,
                         int c,
                         int d)

S3 - { 0,15,11, 8,12, 9, 6, 3,13, 1, 2, 4,10, 7, 5,14 } - 16 terms.

ib3

protected final void ib3(int a,
                         int b,
                         int c,
                         int d)

InvS3 - { 0, 9,10, 7,11,14, 6,13, 3, 5,12, 2, 4, 8,15, 1 } - 15 terms

sb4

protected final void sb4(int a,
                         int b,
                         int c,
                         int d)

S4 - { 1,15, 8, 3,12, 0,11, 6, 2, 5, 4,10, 9,14, 7,13 } - 15 terms.

ib4

protected final void ib4(int a,
                         int b,
                         int c,
                         int d)

InvS4 - { 5, 0, 8, 3,10, 9, 7,14, 2,12,11, 6, 4,15,13, 1 } - 15 terms.

sb5

protected final void sb5(int a,
                         int b,
                         int c,
                         int d)

S5 - {15, 5, 2,11, 4,10, 9,12, 0, 3,14, 8,13, 6, 7, 1 } - 16 terms.

ib5

protected final void ib5(int a,
                         int b,
                         int c,
                         int d)

InvS5 - { 8,15, 2, 9, 4, 1,13,14,11, 6, 5, 3, 7,12,10, 0 } - 16 terms.

sb6

protected final void sb6(int a,
                         int b,
                         int c,
                         int d)

S6 - { 7, 2,12, 5, 8, 4, 6,11,14, 9, 1,15,13, 3,10, 0 } - 15 terms.

ib6

protected final void ib6(int a,
                         int b,
                         int c,
                         int d)

InvS6 - {15,10, 1,13, 5, 3, 6, 0, 4, 9,14, 7, 2,12, 8,11 } - 15 terms.

sb7

protected final void sb7(int a,
                         int b,
                         int c,
                         int d)

S7 - { 1,13,15, 0,14, 8, 2,11, 7, 4,12,10, 9, 3, 5, 6 } - 16 terms.

ib7

protected final void ib7(int a,
                         int b,
                         int c,
                         int d)

InvS7 - { 3, 0, 6,13, 9,14,15, 8, 5,12,11, 7,10, 1, 4, 2 } - 17 terms.

LT

protected final void LT()

Apply the linear transformation to the register set.

inverseLT

protected final void inverseLT()

Apply the inverse of the linear transformation to the register set.

makeWorkingKey

protected abstract int[] makeWorkingKey(byte[] key)

encryptBlock

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

decryptBlock

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