Package com.ongres.scram.common.bouncycastle.pbkdf2

Class GeneralDigest

java.lang.Object

com.ongres.scram.common.bouncycastle.pbkdf2.GeneralDigest

All Implemented Interfaces:

Digest, ExtendedDigest, Memoable

Direct Known Subclasses:

SHA256Digest

public abstract class GeneralDigest
extends Object
implements ExtendedDigest, Memoable

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

Field Summary

Fields

Modifier and Type	Field	Description
private static final int	BYTE_LENGTH
private long	byteCount
private final byte[]	xBuf
private int	xBufOff

Constructor Summary

Constructors

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

Method Summary

Modifier and Type	Method	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 com.ongres.scram.common.bouncycastle.pbkdf2.Digest

doFinal, getAlgorithmName, getDigestSize

Methods inherited from interface com.ongres.scram.common.bouncycastle.pbkdf2.Memoable

copy, reset

Field Details

BYTE_LENGTH

private static final int BYTE_LENGTH

See Also:

• Constant Field Values

xBuf

private final byte[] xBuf

xBufOff

private int xBufOff

byteCount

private long byteCount

Constructor Details

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 Details

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()