generaldigest.java

java 文件下载器。可自定义

// Decompiled by Jad v1.5.8e2. Copyright 2001 Pavel Kouznetsov.
// Jad home page: http://kpdus.tripod.com/jad.html
// Decompiler options: packimports(3) fieldsfirst ansi space 
// Source File Name:   GeneralDigest.java

package org.bouncycastle.crypto.digests;

import org.bouncycastle.crypto.Digest;

public abstract class GeneralDigest
	implements Digest
{

	private byte xBuf[];
	private int xBufOff;
	private long byteCount;

	protected GeneralDigest()
	{
		xBuf = new byte[4];
		xBufOff = 0;
	}

	protected GeneralDigest(GeneralDigest t)
	{
		xBuf = new byte[t.xBuf.length];
		System.arraycopy(t.xBuf, 0, xBuf, 0, t.xBuf.length);
		xBufOff = t.xBufOff;
		byteCount = t.byteCount;
	}

	public void update(byte in)
	{
		xBuf[xBufOff++] = in;
		if (xBufOff == xBuf.length)
		{
			processWord(xBuf, 0);
			xBufOff = 0;
		}
		byteCount++;
	}

	public void update(byte in[], int inOff, int len)
	{
		for (; xBufOff != 0 && len > 0; len--)
		{
			update(in[inOff]);
			inOff++;
		}

		while (len > xBuf.length) 
		{
			processWord(in, inOff);
			inOff += xBuf.length;
			len -= xBuf.length;
			byteCount += xBuf.length;
		}
		for (; len > 0; len--)
		{
			update(in[inOff]);
			inOff++;
		}

	}

	public void finish()
	{
		long bitLength = byteCount << 3;
		update((byte)-128);
		while (xBufOff != 0) 
			update((byte)0);
		processLength(bitLength);
		processBlock();
	}

	public void reset()
	{
		byteCount = 0L;
		xBufOff = 0;
		for (int i = 0; i < xBuf.length; i++)
			xBuf[i] = 0;

	}

	protected abstract void processWord(byte abyte0[], int i);

	protected abstract void processLength(long l);

	protected abstract void processBlock();
}