org.bouncycastle.crypto.digests

Class ParallelHash

java.lang.Object

org.bouncycastle.crypto.digests.ParallelHash

All Implemented Interfaces:

Digest, ExtendedDigest, Xof

public class ParallelHash
extends java.lang.Object
implements Xof, Digest

ParallelHash - a hash designed to support the efficient hashing of very long strings, by taking advantage of the parallelism available in modern processors with an optional XOF mode.

From NIST Special Publication 800-185 - SHA-3 Derived Functions:cSHAKE, KMAC, TupleHash and ParallelHash

Constructor Summary

Constructors

Constructor and Description
ParallelHash(int bitLength, byte[] S, int B) Base constructor.
ParallelHash(int bitLength, byte[] S, int B, int outputSize)
ParallelHash(int bitLength, byte[] S, int B, int outputSize, CryptoServicePurpose purpose)
ParallelHash(ParallelHash source)

Method Summary

Modifier and Type	Method and Description
int	doFinal(byte[] out, int outOff) close the digest, producing the final digest value.
int	doFinal(byte[] out, int outOff, int outLen) Output the results of the final calculation for this digest to outLen number of bytes.
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	getByteLength() Return the size in bytes of the internal buffer the digest applies it's compression function to.
int	getDigestSize() return the size, in bytes, of the digest produced by this message digest.
void	reset() reset the digest back to it's initial state.
void	update(byte in) update the message digest with a single byte.
void	update(byte[] in, int inOff, int len) update the message digest with a block of bytes.

Methods inherited from class java.lang.Object

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

Constructor Detail

ParallelHash

public ParallelHash(int bitLength,
                    byte[] S,
                    int B)

Base constructor.

Parameters:

bitLength - security strength (bits) of the underlying SHAKE function, 128 or 256.

S - the customization string - available for local use.

B - the blocksize (in bytes) for hashing.

ParallelHash

public ParallelHash(int bitLength,
                    byte[] S,
                    int B,
                    int outputSize)

ParallelHash

public ParallelHash(int bitLength,
                    byte[] S,
                    int B,
                    int outputSize,
                    CryptoServicePurpose purpose)

ParallelHash

public ParallelHash(ParallelHash source)

Method Detail

getAlgorithmName

public java.lang.String getAlgorithmName()

Description copied from interface: Digest

return the algorithm name

Specified by:

getAlgorithmName in interface Digest

Returns:

the algorithm name

getByteLength

public int getByteLength()

Description copied from interface: ExtendedDigest

Return the size in bytes of the internal buffer the digest applies it's compression function to.

Specified by:

getByteLength in interface ExtendedDigest

Returns:

byte length of the digests internal buffer.

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

Returns:

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

update

public void update(byte in)
            throws java.lang.IllegalStateException

Description copied from interface: Digest

update the message digest with a single byte.

Specified by:

update in interface Digest

Parameters:

in - the input byte to be entered.

Throws:

java.lang.IllegalStateException

update

public void update(byte[] in,
                   int inOff,
                   int len)
            throws DataLengthException,
                   java.lang.IllegalStateException

Description copied from interface: Digest

update the message digest with a block of bytes.

Specified by:

update in interface Digest

Parameters:

in - the byte array containing the data.

inOff - the offset into the byte array where the data starts.

len - the length of the data.

Throws:

DataLengthException

java.lang.IllegalStateException

doFinal

public int doFinal(byte[] out,
                   int outOff)
            throws DataLengthException,
                   java.lang.IllegalStateException

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

Parameters:

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

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

Throws:

DataLengthException

java.lang.IllegalStateException

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

reset

public void reset()

Description copied from interface: Digest

reset the digest back to it's initial state.

Specified by:

reset in interface Digest