111 lines
3.3 KiB
Java
111 lines
3.3 KiB
Java
/*
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* Copyright 2012 The Netty Project
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*
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* The Netty Project licenses this file to you under the Apache License,
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* version 2.0 (the "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*/
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package io.netty.handler.codec.http.websocketx;
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import io.netty.buffer.ByteBuf;
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import io.netty.buffer.Unpooled;
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import io.netty.handler.codec.base64.Base64;
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import io.netty.util.CharsetUtil;
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import java.security.MessageDigest;
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import java.security.NoSuchAlgorithmException;
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/**
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* A utility class mainly for use by web sockets
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*/
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final class WebSocketUtil {
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/**
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* Performs a MD5 hash on the specified data
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*
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* @param data The data to hash
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* @return The hashed data
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*/
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static byte[] md5(byte[] data) {
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try {
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//Try to get a MessageDigest that uses MD5
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MessageDigest md = MessageDigest.getInstance("MD5");
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//Hash the data
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return md.digest(data);
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} catch (NoSuchAlgorithmException e) {
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//This shouldn't happen! How old is the computer?
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throw new InternalError("MD5 not supported on this platform - Outdated?");
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}
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}
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/**
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* Performs a SHA-1 hash on the specified data
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*
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* @param data The data to hash
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* @return The hashed data
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*/
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static byte[] sha1(byte[] data) {
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try {
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//Attempt to get a MessageDigest that uses SHA1
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MessageDigest md = MessageDigest.getInstance("SHA1");
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//Hash the data
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return md.digest(data);
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} catch (NoSuchAlgorithmException e) {
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//Alright, you might have an old system.
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throw new InternalError("SHA-1 is not supported on this platform - Outdated?");
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}
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}
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/**
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* Performs base64 encoding on the specified data
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*
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* @param data The data to encode
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* @return An encoded string containing the data
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*/
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static String base64(byte[] data) {
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ByteBuf encodedData = Unpooled.wrappedBuffer(data);
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return Base64.encode(encodedData).toString(CharsetUtil.UTF_8);
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}
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/**
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* Creates an arbitrary number of random bytes
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*
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* @param size the number of random bytes to create
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* @return An array of random bytes
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*/
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static byte[] randomBytes(int size) {
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byte[] bytes = new byte[size];
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for (int index = 0; index < size; index++) {
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bytes[index] = (byte) randomNumber(0, 255);
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}
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return bytes;
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}
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/**
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* Generates a pseudo-random number
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*
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* @param minimum The minimum allowable value
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* @param maximum The maximum allowable value
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* @return A pseudo-random number
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*/
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static int randomNumber(int minimum, int maximum) {
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return (int) (Math.random() * maximum + minimum);
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}
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/**
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* A private constructor to ensure that instances of this class cannot be made
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*/
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private WebSocketUtil() {
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// Unused
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}
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}
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