org.spongycastle.crypto.digests

Class GeneralDigest

java.lang.Object

org.spongycastle.crypto.digests.GeneralDigest

All Implemented Interfaces:

Digest, ExtendedDigest, Memoable

Direct Known Subclasses:

MD4Digest, MD5Digest, RIPEMD128Digest, RIPEMD160Digest, RIPEMD256Digest, RIPEMD320Digest, SHA1Digest, SHA224Digest, SHA256Digest, SM3Digest

public abstract class GeneralDigest
extends java.lang.Object
implements ExtendedDigest, Memoable

base implementation of MD4 family style digest as outlined in "Handbook of Applied Cryptography", pages 344 - 347.

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	GeneralDigest() Standard constructor
protected	GeneralDigest(byte[] encodedState)
protected	GeneralDigest(GeneralDigest t) Copy constructor.

Method Summary

Modifier and Type	Method and Description
protected void	copyIn(GeneralDigest t)
void	finish()
int	getByteLength() Return the size in bytes of the internal buffer the digest applies it's compression function to.
protected void	populateState(byte[] state)
protected abstract void	processBlock()
protected abstract void	processLength(long bitLength)
protected abstract void	processWord(byte[] in, int inOff)
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

Methods inherited from interface org.spongycastle.crypto.Digest

doFinal, getAlgorithmName, getDigestSize

Methods inherited from interface org.spongycastle.util.Memoable

copy, reset

Constructor Detail

GeneralDigest

protected GeneralDigest()

Standard constructor

GeneralDigest

protected GeneralDigest(GeneralDigest t)

Copy constructor. We are using copy constructors in place of the Object.clone() interface as this interface is not supported by J2ME.

GeneralDigest

protected GeneralDigest(byte[] encodedState)

Method Detail

copyIn

protected void copyIn(GeneralDigest t)

update

public void update(byte in)

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.

update

public void update(byte[] in,
                   int inOff,
                   int len)

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.

finish

public void finish()

reset

public void reset()

Description copied from interface: Digest

reset the digest back to it's initial state.

Specified by:

reset in interface Digest

populateState

protected void populateState(byte[] state)

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.

processWord

protected abstract void processWord(byte[] in,
                                    int inOff)

processLength

protected abstract void processLength(long bitLength)

processBlock

protected abstract void processBlock()