Package org.gudy.bouncycastle.crypto.digests

Class GeneralDigest

java.lang.Object

org.gudy.bouncycastle.crypto.digests.GeneralDigest

All Implemented Interfaces:

Digest

Direct Known Subclasses:

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

public abstract class GeneralDigest
extends Object
implements Digest

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 long	byteCount
private byte[]	xBuf
private int	xBufOff

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	GeneralDigest()	Standard constructor
protected	GeneralDigest(GeneralDigest t)	Copy constructor.

Method Summary

Modifier and Type	Method	Description
void	finish()
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.gudy.bouncycastle.crypto.Digest

doFinal, getAlgorithmName, getDigestSize

Field Details

xBuf

private 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.

Method Details

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

processWord

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

processLength

protected abstract void processLength(long bitLength)

processBlock

protected abstract void processBlock()