| /* |
| * Copyright 2010 Google Inc. |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); you may not |
| * use this file except in compliance with the License. You may obtain a copy of |
| * the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT |
| * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the |
| * License for the specific language governing permissions and limitations under |
| * the License. |
| */ |
| package java.security; |
| |
| import com.google.gwt.core.client.impl.Md5Digest; |
| |
| /** |
| * Message Digest algorithm - <a href= |
| * "http://java.sun.com/j2se/1.4.2/docs/api/java/security/MessageDigest.html" |
| * >[Sun's docs]</a>. |
| */ |
| public abstract class MessageDigest extends MessageDigestSpi { |
| |
| public static MessageDigest getInstance(String algorithm) |
| throws NoSuchAlgorithmException { |
| if ("MD5".equals(algorithm)) { |
| return new Md5Digest(); |
| } |
| throw new NoSuchAlgorithmException(algorithm + " not supported"); |
| } |
| |
| public static boolean isEqual(byte[] digestA, byte[] digestB) { |
| int n = digestA.length; |
| if (n != digestB.length) { |
| return false; |
| } |
| for (int i = 0; i < n; ++i) { |
| if (digestA[i] != digestB[i]) { |
| return false; |
| } |
| } |
| return true; |
| } |
| |
| private final String algorithm; |
| |
| protected MessageDigest(String algorithm) { |
| this.algorithm = algorithm; |
| } |
| |
| public byte[] digest() { |
| return engineDigest(); |
| } |
| |
| public byte[] digest(byte[] input) { |
| update(input); |
| return digest(); |
| } |
| |
| public int digest(byte[] buf, int offset, int len) throws DigestException { |
| return engineDigest(buf, offset, len); |
| } |
| |
| public final String getAlgorithm() { |
| return algorithm; |
| } |
| |
| public final int getDigestLength() { |
| return engineGetDigestLength(); |
| } |
| |
| public void reset() { |
| engineReset(); |
| } |
| |
| public void update(byte input) { |
| engineUpdate(input); |
| } |
| |
| public void update(byte[] input) { |
| engineUpdate(input, 0, input.length); |
| } |
| |
| public void update(byte[] input, int offset, int len) { |
| engineUpdate(input, offset, len); |
| } |
| } |