| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF 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 |
| * |
| * http://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 org.apache.sshd.common.kex; |
| |
| /** |
| * General interface for key encapsulation methods (KEM). |
| */ |
| public interface KeyEncapsulationMethod { |
| |
| /** |
| * Client-side KEM operations. |
| */ |
| interface Client { |
| |
| /** |
| * Initializes the KEM and generates a new key pair. |
| */ |
| void init(); |
| |
| /** |
| * Retrieves the KEM public key. |
| */ |
| byte[] getPublicKey(); |
| |
| /** |
| * Extracts the secret from an encapsulation ciphertext. |
| * |
| * @param encapsulated ciphertext to process. |
| * |
| * @throws IllegalArgumentException if {@code encapsulated} doesn't have the expected length |
| * @throws NullPointerException if {@code encapsulated == null} |
| */ |
| byte[] extractSecret(byte[] encapsulated); |
| |
| /** |
| * Retrieves the required encapsulation length in bytes. |
| * |
| * @return the length required for a valid encapsulation ciphertext |
| */ |
| int getEncapsulationLength(); |
| } |
| |
| /** |
| * Server-side KEM operations. |
| */ |
| interface Server { |
| |
| /** |
| * Initializes the KEM with a public key received from a client and prepares an encapsulated secret. |
| * |
| * @param publicKey data received from the client, expected to contain the public key at the |
| * start |
| * @return the remaining bytes of {@code publicKey} after the public key |
| * |
| * @throws IllegalArgumentException if {@code publicKey} does not have enough bytes for a valid public key |
| * @throws NullPointerException if {@code publicKey == null} |
| */ |
| byte[] init(byte[] publicKey); |
| |
| /** |
| * Retrieves the secret. |
| * |
| * @return the secret, not encapsulated |
| */ |
| byte[] getSecret(); |
| |
| /** |
| * Retrieves the encapsulation of the secret. |
| * |
| * @return the encapsulation of the secret that may be sent to the client |
| */ |
| byte[] getEncapsulation(); |
| } |
| |
| Client getClient(); |
| |
| Server getServer(); |
| } |