WebSocketUtil.java — netty Source File

Source Code

/*
 * Copyright 2012 The Netty Project
 *
 * The Netty Project licenses this file to you 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:
 *
 *   https://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 io.netty.handler.codec.http.websocketx;

import io.netty.util.concurrent.FastThreadLocal;

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.Base64;
import java.util.concurrent.ThreadLocalRandom;

/**
 * A utility class mainly for use by web sockets
 */
final class WebSocketUtil {

    private static final FastThreadLocal<MessageDigest> MD5 = new FastThreadLocal<MessageDigest>() {
        @Override
        protected MessageDigest initialValue() throws Exception {
            try {
                //Try to get a MessageDigest that uses MD5
                //Suppress a warning about weak hash algorithm
                //since it's defined in draft-ietf-hybi-thewebsocketprotocol-00
                return MessageDigest.getInstance("MD5");
            } catch (NoSuchAlgorithmException e) {
                //This shouldn't happen! How old is the computer?
                throw new InternalError("MD5 not supported on this platform - Outdated?");
            }
        }
    };

    private static final FastThreadLocal<MessageDigest> SHA1 = new FastThreadLocal<MessageDigest>() {
        @Override
        protected MessageDigest initialValue() throws Exception {
            try {
                //Try to get a MessageDigest that uses SHA1
                //Suppress a warning about weak hash algorithm
                //since it's defined in draft-ietf-hybi-thewebsocketprotocol-00
                return MessageDigest.getInstance("SHA1");
            } catch (NoSuchAlgorithmException e) {
                //This shouldn't happen! How old is the computer?
                throw new InternalError("SHA-1 not supported on this platform - Outdated?");
            }
        }
    };

    /**
// ... (94 more lines)