1 /*
2 * Copyright 2023 The Netty Project
3 *
4 * The Netty Project licenses this file to you under the Apache License,
5 * version 2.0 (the "License"); you may not use this file except in compliance
6 * with the License. You may obtain a copy of the License at:
7 *
8 * https://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
12 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
13 * License for the specific language governing permissions and limitations
14 * under the License.
15 */
16 package io.netty.handler.codec.quic;
17
18 import io.netty.util.internal.ObjectUtil;
19
20 import java.nio.ByteBuffer;
21
22 /**
23 * A {@link QuicResetTokenGenerator} which creates new reset token by using the connection id by signing the given input
24 * using <a href="https://www.ietf.org/archive/id/draft-ietf-quic-transport-29.html#section-10.4.2">HMAC algorithms</a>.
25 */
26 final class HmacSignQuicResetTokenGenerator implements QuicResetTokenGenerator {
27 static final QuicResetTokenGenerator INSTANCE = new HmacSignQuicResetTokenGenerator();
28
29 private HmacSignQuicResetTokenGenerator() {
30 }
31
32 @Override
33 public ByteBuffer newResetToken(ByteBuffer cid) {
34 ObjectUtil.checkNotNull(cid, "cid");
35 ObjectUtil.checkPositive(cid.remaining(), "cid");
36 return Hmac.sign(cid, Quic.RESET_TOKEN_LEN);
37 }
38 }