generaldigest.java

进行与数字证书相关开发必须的java源码

// Decompiled by Jad v1.5.7g. Copyright 2000 Pavel Kouznetsov.
// Jad home page: http://www.geocities.com/SiliconValley/Bridge/8617/jad.html
// Decompiler options: packimports(3) fieldsfirst ansi 
// Source File Name:   GeneralDigest.java

package jit.crypto.digests;

import jit.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();

    public abstract int doFinal(byte abyte0[], int i);

    public abstract int getDigestSize();

    public abstract String getAlgorithmName();
}