org.bouncycastle.crypto.digests

Class SHA512tDigest

java.lang.Object

org.bouncycastle.crypto.digests.LongDigest

org.bouncycastle.crypto.digests.SHA512tDigest

All Implemented Interfaces:

Digest, EncodableDigest, EncodableService, ExtendedDigest, Memoable

public class SHA512tDigest
extends LongDigest

FIPS 180-4 implementation of SHA-512/t

Note: SHA-512/224 provides 112 bits of security (NIST IR 8547, Table 8) and is disallowed under SP 800-131A after 2030. A BitsOfSecurityConstraint of 128 refuses it.

Field Summary

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

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

Constructor Summary

Constructors

Constructor and Description
SHA512tDigest(byte[] encodedState)
SHA512tDigest(int bitLength) Standard constructor
SHA512tDigest(int bitLength, CryptoServicePurpose purpose)
SHA512tDigest(SHA512tDigest 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.
protected CryptoServiceProperties	cryptoServiceProperties()
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.bouncycastle.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

SHA512tDigest

public SHA512tDigest(int bitLength)

Standard constructor

SHA512tDigest

public SHA512tDigest(int bitLength,
                     CryptoServicePurpose purpose)

SHA512tDigest

public SHA512tDigest(SHA512tDigest t)

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

SHA512tDigest

public SHA512tDigest(byte[] encodedState)

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.

cryptoServiceProperties

protected CryptoServiceProperties cryptoServiceProperties()

Specified by:

cryptoServiceProperties in class LongDigest