org.bouncycastle.crypto.digests

Class SHAKEDigest

java.lang.Object

org.bouncycastle.crypto.digests.KeccakDigest

org.bouncycastle.crypto.digests.SHAKEDigest

All Implemented Interfaces:

Digest, EncodableDigest, EncodableService, ExtendedDigest, SavableDigest, Xof, Memoable

Direct Known Subclasses:

CSHAKEDigest

public class SHAKEDigest
extends KeccakDigest
implements Xof, SavableDigest

implementation of SHAKE based on following KeccakNISTInterface.c from https://keccak.noekeon.org/

Following the naming conventions used in the C source code to enable easy review of the implementation.

Field Summary

Fields inherited from class org.bouncycastle.crypto.digests.KeccakDigest

bitsInQueue, dataQueue, fixedOutputLength, purpose, rate, squeezing, state

Constructor Summary

Constructors

Constructor and Description
SHAKEDigest()
SHAKEDigest(byte[] encodedState)
SHAKEDigest(CryptoServicePurpose purpose)
SHAKEDigest(int bitStrength) Base constructor.
SHAKEDigest(int bitStrength, CryptoServicePurpose purpose) Base constructor.
SHAKEDigest(SHAKEDigest source) Clone constructor

Method Summary

Modifier and Type	Method and Description
Memoable	copy() Produce a copy of this object with its configuration and in its current state.
protected CryptoServiceProperties	cryptoServiceProperties()
int	doFinal(byte[] out, int outOff) close the digest, producing the final digest value.
protected int	doFinal(byte[] out, int outOff, byte partialByte, int partialBits)
int	doFinal(byte[] out, int outOff, int outLen) Output the results of the final calculation for this digest to outLen number of bytes.
protected int	doFinal(byte[] out, int outOff, int outLen, byte partialByte, int partialBits)
int	doOutput(byte[] out, int outOff, int outLen) Start outputting the results of the final calculation for this digest.
java.lang.String	getAlgorithmName() return the algorithm name
int	getDigestSize() return the size, in bytes, of the digest produced by this message digest.
byte[]	getEncodedState() Return an encoded byte array for the digest's internal state
void	reset(Memoable other) Restore a copied object state into this object.

Methods inherited from class org.bouncycastle.crypto.digests.KeccakDigest

absorb, absorb, absorbBits, copyIn, getByteLength, getEncodedState, reset, squeeze, update, update

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.bouncycastle.crypto.ExtendedDigest

getByteLength

Methods inherited from interface org.bouncycastle.crypto.Digest

reset, update, update

Constructor Detail

SHAKEDigest

public SHAKEDigest()

SHAKEDigest

public SHAKEDigest(CryptoServicePurpose purpose)

SHAKEDigest

public SHAKEDigest(int bitStrength)

Base constructor.

Parameters:

bitStrength - the security strength in bits of the XOF.

SHAKEDigest

public SHAKEDigest(int bitStrength,
                   CryptoServicePurpose purpose)

Base constructor.

Parameters:

bitStrength - the security strength in bits of the XOF.

purpose - the purpose of the digest will be used for.

SHAKEDigest

public SHAKEDigest(SHAKEDigest source)

Clone constructor

Parameters:

source - the other digest to be copied.

SHAKEDigest

public SHAKEDigest(byte[] encodedState)

Method Detail

getAlgorithmName

public java.lang.String getAlgorithmName()

Description copied from interface: Digest

return the algorithm name

Specified by:

getAlgorithmName in interface Digest

Overrides:

getAlgorithmName in class KeccakDigest

Returns:

the algorithm name

getDigestSize

public int getDigestSize()

Description copied from interface: Digest

return the size, in bytes, of the digest produced by this message digest.

Specified by:

getDigestSize in interface Digest

Overrides:

getDigestSize in class KeccakDigest

Returns:

the size, in bytes, of the digest produced by this message digest.

doFinal

public int doFinal(byte[] out,
                   int outOff)

Description copied from interface: Digest

close the digest, producing the final digest value. The doFinal call leaves the digest reset.

Specified by:

doFinal in interface Digest

Overrides:

doFinal in class KeccakDigest

Parameters:

out - the array the digest is to be copied into.

outOff - the offset into the out array the digest is to start at.

doFinal

public int doFinal(byte[] out,
                   int outOff,
                   int outLen)

Description copied from interface: Xof

Output the results of the final calculation for this digest to outLen number of bytes.

Specified by:

doFinal in interface Xof

Parameters:

out - output array to write the output bytes to.

outOff - offset to start writing the bytes at.

outLen - the number of output bytes requested.

Returns:

the number of bytes written

doOutput

public int doOutput(byte[] out,
                    int outOff,
                    int outLen)

Description copied from interface: Xof

Start outputting the results of the final calculation for this digest. Unlike doFinal, this method will continue producing output until the Xof is explicitly reset, or signals otherwise.

Specified by:

doOutput in interface Xof

Parameters:

out - output array to write the output bytes to.

outOff - offset to start writing the bytes at.

outLen - the number of output bytes requested.

Returns:

the number of bytes written

doFinal

protected int doFinal(byte[] out,
                      int outOff,
                      byte partialByte,
                      int partialBits)

Overrides:

doFinal in class KeccakDigest

doFinal

protected int doFinal(byte[] out,
                      int outOff,
                      int outLen,
                      byte partialByte,
                      int partialBits)

cryptoServiceProperties

protected CryptoServiceProperties cryptoServiceProperties()

Overrides:

cryptoServiceProperties in class KeccakDigest

getEncodedState

public byte[] getEncodedState()

Description copied from interface: EncodableDigest

Return an encoded byte array for the digest's internal state

Specified by:

getEncodedState in interface EncodableDigest

Specified by:

getEncodedState in interface EncodableService

Returns:

an encoding of the digests internal state.

copy

public Memoable copy()

Description copied from interface: Memoable

Produce a copy of this object with its configuration and in its current state.

The returned object may be used simply to store the state, or may be used as a similar object starting from the copied state.

Specified by:

copy in interface Memoable

reset

public void reset(Memoable other)

Description copied from interface: Memoable

Restore a copied object state into this object.

Implementations of this method should try to avoid or minimise memory allocation to perform the reset.

Specified by:

reset in interface Memoable

Parameters:

other - an object originally copied from an object of the same type as this instance.