org.spongycastle.crypto.digests

Class SHA512Digest

java.lang.Object

org.spongycastle.crypto.digests.LongDigest

org.spongycastle.crypto.digests.SHA512Digest

All Implemented Interfaces:

Digest, EncodableDigest, ExtendedDigest, Memoable

public class SHA512Digest
extends LongDigest

FIPS 180-2 implementation of SHA-512.

         block  word  digest
 SHA-1   512    32    160
 SHA-256 512    32    256
 SHA-384 1024   64    384
 SHA-512 1024   64    512
 

Field Summary

Fields inherited from class org.spongycastle.crypto.digests.LongDigest

H1, H2, H3, H4, H5, H6, H7, H8

Constructor Summary

Constructors

Constructor and Description
SHA512Digest() Standard constructor
SHA512Digest(byte[] encodedState) State constructor - create a digest initialised with the state of a previous one.
SHA512Digest(SHA512Digest t) Copy 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.
int	doFinal(byte[] out, int outOff) close the digest, producing the final digest value.
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() reset the chaining variables
void	reset(Memoable other) Restore a copied object state into this object.

Methods inherited from class org.spongycastle.crypto.digests.LongDigest

copyIn, finish, getByteLength, getEncodedStateSize, populateState, processBlock, processLength, processWord, restoreState, update, update

Methods inherited from class java.lang.Object

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

Constructor Detail

SHA512Digest

public SHA512Digest()

Standard constructor

SHA512Digest

public SHA512Digest(SHA512Digest t)

Copy constructor. This will copy the state of the provided message digest.

SHA512Digest

public SHA512Digest(byte[] encodedState)

State constructor - create a digest initialised with the state of a previous one.

Parameters:

encodedState - the encoded state from the originating digest.

Method Detail

getAlgorithmName

public java.lang.String getAlgorithmName()

Description copied from interface: Digest

return the algorithm name

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.

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.

Parameters:

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

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

reset

public void reset()

reset the chaining variables

Specified by:

reset in interface Digest

Overrides:

reset in class LongDigest

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.

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.

Parameters:

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

getEncodedState

public byte[] getEncodedState()

Description copied from interface: EncodableDigest

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

Returns:

an encoding of the digests internal state.