2012-01-19 05:12:45 +01:00
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/*
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2012-06-04 22:31:44 +02:00
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* Copyright 2012 The Netty Project
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2012-01-19 05:12:45 +01:00
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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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2012-06-04 22:31:44 +02:00
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* http://www.apache.org/licenses/LICENSE-2.0
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2012-01-19 05:12:45 +01:00
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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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2012-06-10 04:08:43 +02:00
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import io.netty.buffer.ByteBuf;
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2012-06-10 04:31:39 +02:00
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import io.netty.buffer.ByteBufs;
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2012-01-19 05:12:45 +01:00
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import io.netty.handler.codec.base64.Base64;
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import io.netty.util.CharsetUtil;
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2012-05-31 21:03:01 +02:00
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import java.security.MessageDigest;
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import java.security.NoSuchAlgorithmException;
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2012-01-19 05:12:45 +01:00
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/**
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* TODO Document me.
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*/
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final class WebSocketUtil {
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/**
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* Performs an MD5 hash
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*
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* @param bytes
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* Data to hash
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* @return Hashed data
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*/
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static byte[] md5(byte[] bytes) {
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try {
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MessageDigest md = MessageDigest.getInstance("MD5");
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return md.digest(bytes);
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} catch (NoSuchAlgorithmException e) {
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throw new InternalError("MD5 not supported on this platform");
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}
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}
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/**
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* Performs an SHA-1 hash
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*
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* @param bytes
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* Data to hash
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* @return Hashed data
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*/
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static byte[] sha1(byte[] bytes) {
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try {
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MessageDigest md = MessageDigest.getInstance("SHA1");
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return md.digest(bytes);
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} catch (NoSuchAlgorithmException e) {
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throw new InternalError("SHA-1 not supported on this platform");
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}
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}
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/**
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* Base 64 encoding
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*
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* @param bytes
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* Bytes to encode
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* @return encoded string
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*/
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static String base64(byte[] bytes) {
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2012-06-10 04:31:39 +02:00
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ByteBuf hashed = ByteBufs.wrappedBuffer(bytes);
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2012-01-19 05:12:45 +01:00
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return Base64.encode(hashed).toString(CharsetUtil.UTF_8);
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}
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/**
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* Creates some random bytes
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*
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* @param size
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* Number of random bytes to create
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* @return 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 i = 0; i < size; i++) {
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bytes[i] = (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 random number
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*
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* @param min
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* Minimum value
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* @param max
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* Maximum value
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* @return Random number
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*/
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static int randomNumber(int min, int max) {
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return (int) (Math.random() * max + min);
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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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