1 /* Copyright (c) 2000 The Legion Of The Bouncy Castle
2 * (http://www.bouncycastle.org)
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
11 * The above copyright notice and this permission notice shall be included in
12 * all copies or substantial portions of the Software.
14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
17 * AUTHORS OR COPYRIGHT HOLDER.S BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
18 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
19 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
20 * DEALINGS IN THE SOFTWARE.
23 package org.ibex.crypto;
26 * base implementation of MD4 family style digest as outlined in
27 * "Handbook of Applied Cryptography", pages 344 - 347.
29 public abstract class Digest {
32 private long byteCount;
34 protected Digest() { xBuf = new byte[4]; xBufOff = 0; }
35 public void update(byte in) {
37 if (xBufOff == xBuf.length) {
44 public void update(byte[] in, int inOff, int len) {
45 // fill the current word
46 while ((xBufOff != 0) && (len > 0)) {
52 // process whole words.
53 while (len > xBuf.length) {
54 processWord(in, inOff);
57 byteCount += xBuf.length;
60 // load in the remainder.
68 protected void finish() {
69 long bitLength = (byteCount << 3);
72 while (xBufOff != 0) update((byte)0);
73 processLength(bitLength);
80 for ( int i = 0; i < xBuf.length; i++) xBuf[i] = 0;
83 protected abstract void processWord(byte[] in, int inOff);
84 protected abstract void processLength(long bitLength);
85 protected abstract void processBlock();
86 public abstract int getDigestSize();
87 public abstract void doFinal(byte[] out, int outOff);