org.bouncycastle.crypto.engines

Class ElephantEngine

java.lang.Object

org.bouncycastle.crypto.engines.ElephantEngine

All Implemented Interfaces:

AEADCipher

public class ElephantEngine
extends java.lang.Object

Elephant AEAD v2, based on the current round 3 submission, https://www.esat.kuleuven.be/cosic/elephant/ Reference C implementation: https://github.com/TimBeyne/Elephant Specification: https://csrc.nist.gov/CSRC/media/Projects/lightweight-cryptography/documents/finalist-round/updated-spec-doc/elephant-spec-final.pdf

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
protected static interface	AEADBaseEngine.AADOperator
protected static class	AEADBaseEngine.AADOperatorType
protected static interface	AEADBaseEngine.DataOperator
protected static class	AEADBaseEngine.DataOperatorType
protected static class	AEADBaseEngine.ErasableOutputStream
protected static class	AEADBaseEngine.ProcessingBufferType
protected static class	AEADBaseEngine.State
protected static class	AEADBaseEngine.StreamAADOperator
static class	ElephantEngine.ElephantParameters

Field Summary

Fields

Modifier and Type	Field and Description
protected int	AADBufferSize
protected AEADBaseEngine.AADOperator	aadOperator
protected java.lang.String	algorithmName
protected int	BlockSize
protected AEADBaseEngine.DataOperator	dataOperator
protected boolean	forEncryption
protected byte[]	initialAssociatedText
protected int	IV_SIZE
protected int	KEY_SIZE
protected byte[]	m_aad
protected int	m_aadPos
protected byte[]	m_buf
protected int	m_bufferSizeDecrypt
protected int	m_bufPos
protected AEADBaseEngine.State	m_state
protected byte[]	mac
protected int	MAC_SIZE
protected org.bouncycastle.crypto.engines.AEADBaseEngine.AADProcessingBuffer	processor

Constructor Summary

Constructors

Constructor and Description
ElephantEngine(ElephantEngine.ElephantParameters parameters)

Method Summary

Modifier and Type	Method and Description
protected void	checkAAD()
protected boolean	checkData(boolean isDofinal)
int	doFinal(byte[] output, int outOff) Finish the operation either appending or verifying the MAC at the end of the data.
protected void	ensureInitialized()
protected void	ensureSufficientInputBuffer(byte[] input, int inOff, int len)
protected void	ensureSufficientOutputBuffer(byte[] output, int outOff, int len)
protected void	finishAAD(AEADBaseEngine.State nextState, boolean isDoFinal)
protected void	finishAAD1(AEADBaseEngine.State nextState)
protected void	finishAAD2(AEADBaseEngine.State nextState)
protected void	finishAAD3(AEADBaseEngine.State nextState, boolean isDoFinal)
java.lang.String	getAlgorithmName() Return the name of the algorithm.
int	getBlockSize()
int	getIVBytesSize()
int	getKeyBytesSize()
byte[]	getMac() Return the value of the MAC associated with the last stream processed.
int	getOutputSize(int len) return the size of the output buffer required for a processBytes plus a doFinal with an input of len bytes.
protected int	getTotalBytesForUpdate(int len)
int	getUpdateOutputSize(int len) return the size of the output buffer required for a processBytes an input of len bytes.
void	init(boolean forEncryption, CipherParameters params) initialise the underlying cipher.
protected void	init(byte[] k, byte[] iv)
void	processAADByte(byte input) Add a single byte to the associated data check.
void	processAADBytes(byte[] input, int inOff, int len) Add a sequence of bytes to the associated data check.
protected void	processBufferAAD(byte[] input, int inOff)
protected void	processBufferDecrypt(byte[] input, int inOff, byte[] output, int outOff)
protected void	processBufferEncrypt(byte[] input, int inOff, byte[] output, int outOff)
int	processByte(byte in, byte[] out, int outOff) encrypt/decrypt a single byte.
int	processBytes(byte[] input, int inOff, int len, byte[] output, int outOff) process a block of bytes from in putting the result into out.
protected int	processEncDecByte(byte[] output, int outOff)
protected int	processEncDecBytes(byte[] input, int inOff, int len, byte[] output, int outOff)
protected void	processFinalAAD()
protected void	processFinalBlock(byte[] output, int outOff)
void	reset() Reset the cipher.
protected void	reset(boolean clearMac)
protected void	setInnerMembers(AEADBaseEngine.ProcessingBufferType type, AEADBaseEngine.AADOperatorType aadOperatorType, AEADBaseEngine.DataOperatorType dataOperatorType)
static void	xorTo(int len, byte[] x, byte[] y, byte[] z)

Methods inherited from class java.lang.Object

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

Field Detail

forEncryption

protected boolean forEncryption

algorithmName

protected java.lang.String algorithmName

KEY_SIZE

protected int KEY_SIZE

IV_SIZE

protected int IV_SIZE

MAC_SIZE

protected int MAC_SIZE

initialAssociatedText

protected byte[] initialAssociatedText

mac

protected byte[] mac

m_buf

protected byte[] m_buf

m_aad

protected byte[] m_aad

m_bufPos

protected int m_bufPos

m_aadPos

protected int m_aadPos

AADBufferSize

protected int AADBufferSize

BlockSize

protected int BlockSize

m_state

protected AEADBaseEngine.State m_state

m_bufferSizeDecrypt

protected int m_bufferSizeDecrypt

processor

protected org.bouncycastle.crypto.engines.AEADBaseEngine.AADProcessingBuffer processor

aadOperator

protected AEADBaseEngine.AADOperator aadOperator

dataOperator

protected AEADBaseEngine.DataOperator dataOperator

Constructor Detail

ElephantEngine

public ElephantEngine(ElephantEngine.ElephantParameters parameters)

Method Detail

init

protected void init(byte[] k,
                    byte[] iv)
             throws java.lang.IllegalArgumentException

Throws:

java.lang.IllegalArgumentException

processBufferEncrypt

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

processBufferDecrypt

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

processFinalBlock

protected void processFinalBlock(byte[] output,
                                 int outOff)

processBufferAAD

protected void processBufferAAD(byte[] input,
                                int inOff)

getUpdateOutputSize

public int getUpdateOutputSize(int len)

Description copied from interface: AEADCipher

return the size of the output buffer required for a processBytes an input of len bytes.

The returned size may be dependent on the initialisation of this cipher and may not be accurate once subsequent input data is processed - this method should be invoked immediately prior to input data being processed.

Specified by:

getUpdateOutputSize in interface AEADCipher

Parameters:

len - the length of the input.

Returns:

the space required to accommodate a call to processBytes with len bytes of input.

getOutputSize

public int getOutputSize(int len)

Description copied from interface: AEADCipher

return the size of the output buffer required for a processBytes plus a doFinal with an input of len bytes.

The returned size may be dependent on the initialisation of this cipher and may not be accurate once subsequent input data is processed - this method should be invoked immediately prior to a call to final processing of input data and a call to AEADCipher.doFinal(byte[], int).

Specified by:

getOutputSize in interface AEADCipher

Parameters:

len - the length of the input.

Returns:

the space required to accommodate a call to processBytes and doFinal with len bytes of input.

finishAAD

protected void finishAAD(AEADBaseEngine.State nextState,
                         boolean isDoFinal)

processFinalAAD

protected void processFinalAAD()

reset

protected void reset(boolean clearMac)

checkAAD

protected void checkAAD()

checkData

protected boolean checkData(boolean isDofinal)

xorTo

public static void xorTo(int len,
                         byte[] x,
                         byte[] y,
                         byte[] z)

getAlgorithmName

public java.lang.String getAlgorithmName()

Description copied from interface: AEADCipher

Return the name of the algorithm.

Specified by:

getAlgorithmName in interface AEADCipher

Returns:

the algorithm name.

getKeyBytesSize

public int getKeyBytesSize()

getIVBytesSize

public int getIVBytesSize()

getMac

public byte[] getMac()

Description copied from interface: AEADCipher

Return the value of the MAC associated with the last stream processed.

Specified by:

getMac in interface AEADCipher

Returns:

MAC for plaintext data.

init

public void init(boolean forEncryption,
                 CipherParameters params)

Description copied from interface: AEADCipher

initialise the underlying cipher. Parameter can either be an AEADParameters or a ParametersWithIV object.

Specified by:

init in interface AEADCipher

Parameters:

forEncryption - true if we are setting up for encryption, false otherwise.

params - the necessary parameters for the underlying cipher to be initialised.

reset

public void reset()

Description copied from interface: AEADCipher

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 AEADCipher

setInnerMembers

protected void setInnerMembers(AEADBaseEngine.ProcessingBufferType type,
                               AEADBaseEngine.AADOperatorType aadOperatorType,
                               AEADBaseEngine.DataOperatorType dataOperatorType)

processAADByte

public void processAADByte(byte input)

Description copied from interface: AEADCipher

Add a single byte to the associated data check.
If the implementation supports it, this will be an online operation and will not retain the associated data.

Specified by:

processAADByte in interface AEADCipher

Parameters:

input - the byte to be processed.

processAADBytes

public void processAADBytes(byte[] input,
                            int inOff,
                            int len)

Description copied from interface: AEADCipher

Add a sequence of bytes to the associated data check.
If the implementation supports it, this will be an online operation and will not retain the associated data.

Specified by:

processAADBytes in interface AEADCipher

Parameters:

input - the input byte array.

inOff - the offset into the in array where the data to be processed starts.

len - the number of bytes to be processed.

processByte

public int processByte(byte in,
                       byte[] out,
                       int outOff)
                throws DataLengthException

Description copied from interface: AEADCipher

encrypt/decrypt a single byte.

Specified by:

processByte in interface AEADCipher

Parameters:

in - the byte to be processed.

out - the output buffer the processed byte goes into.

outOff - the offset into the output byte array the processed data starts at.

Returns:

the number of bytes written to out.

Throws:

DataLengthException - if the output buffer is too small.

processEncDecByte

protected int processEncDecByte(byte[] output,
                                int outOff)

processBytes

public int processBytes(byte[] input,
                        int inOff,
                        int len,
                        byte[] output,
                        int outOff)
                 throws DataLengthException

Description copied from interface: AEADCipher

process a block of bytes from in putting the result into out.

Specified by:

processBytes in interface AEADCipher

Parameters:

input - the input byte array.

inOff - the offset into the in array where the data to be processed starts.

len - the number of bytes to be processed.

output - the output buffer the processed bytes go into.

outOff - the offset into the output byte array the processed data starts at.

Returns:

the number of bytes written to out.

Throws:

DataLengthException - if the output buffer is too small.

processEncDecBytes

protected int processEncDecBytes(byte[] input,
                                 int inOff,
                                 int len,
                                 byte[] output,
                                 int outOff)

doFinal

public int doFinal(byte[] output,
                   int outOff)
            throws java.lang.IllegalStateException,
                   InvalidCipherTextException

Description copied from interface: AEADCipher

Finish the operation either appending or verifying the MAC at the end of the data.

Specified by:

doFinal in interface AEADCipher

Parameters:

output - space for any resulting output data.

outOff - offset into out to start copying the data at.

Returns:

number of bytes written into out.

Throws:

java.lang.IllegalStateException - if the cipher is in an inappropriate state.

InvalidCipherTextException - if the MAC fails to match.

getBlockSize

public final int getBlockSize()

getTotalBytesForUpdate

protected int getTotalBytesForUpdate(int len)

ensureSufficientOutputBuffer

protected final void ensureSufficientOutputBuffer(byte[] output,
                                                  int outOff,
                                                  int len)

ensureSufficientInputBuffer

protected final void ensureSufficientInputBuffer(byte[] input,
                                                 int inOff,
                                                 int len)

ensureInitialized

protected final void ensureInitialized()

finishAAD1

protected void finishAAD1(AEADBaseEngine.State nextState)

finishAAD2

protected void finishAAD2(AEADBaseEngine.State nextState)

finishAAD3

protected void finishAAD3(AEADBaseEngine.State nextState,
                          boolean isDoFinal)