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/*
 * Copyright (c) 2019, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

package com.sun.webkit.security;

import com.sun.javafx.webkit.WCMessageDigestImpl;
import com.sun.webkit.perf.WCMessageDigestPerfLogger;
import java.nio.ByteBuffer;

public abstract class WCMessageDigest {
    /**
     * Creates the instance of WCMessageDigest for the given algorithm.
     * @param algorithm the name of the algorithm like SHA-1, SHA-256.
     */
    protected static WCMessageDigest getInstance(String algorithm) {
        try {
            WCMessageDigest digest = new WCMessageDigestImpl(algorithm);
            return WCMessageDigestPerfLogger.isEnabled() ? new WCMessageDigestPerfLogger(digest) : digest;
        } catch (Exception ex) {
            return null;
        }
    }

    /**
     * Update the digest using the specified ByteBuffer.
     */
    public abstract void addBytes(ByteBuffer input);

    /**
     * Returns the computed hash value.
     */
    public abstract byte[] computeHash();
}