| /* |
| * 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.config.keys; |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.io.OutputStream; |
| import java.io.StreamCorruptedException; |
| import java.security.GeneralSecurityException; |
| import java.security.PrivateKey; |
| import java.security.PublicKey; |
| import java.security.spec.InvalidKeySpecException; |
| import java.util.Collection; |
| import java.util.Map; |
| |
| import org.apache.sshd.common.config.keys.loader.KeyPairResourceLoader; |
| import org.apache.sshd.common.session.SessionContext; |
| import org.apache.sshd.common.util.GenericUtils; |
| import org.apache.sshd.common.util.ValidateUtils; |
| |
| /** |
| * Represents a decoder of an {@code OpenSSH} encoded key data |
| * |
| * @param <PUB> Type of {@link PublicKey} |
| * @param <PRV> Type of {@link PrivateKey} |
| * @author <a href="mailto:dev@mina.apache.org">Apache MINA SSHD Project</a> |
| */ |
| public interface PublicKeyEntryDecoder<PUB extends PublicKey, PRV extends PrivateKey> |
| extends KeyEntryResolver<PUB, PRV>, PublicKeyRawDataDecoder<PUB>, PublicKeyEntryResolver { |
| |
| @Override |
| default PublicKey resolve( |
| SessionContext session, String keyType, byte[] keyData, Map<String, String> headers) |
| throws IOException, GeneralSecurityException { |
| ValidateUtils.checkNotNullAndNotEmpty(keyType, "No key type provided"); |
| Collection<String> supported = getSupportedKeyTypes(); |
| if ((GenericUtils.size(supported) > 0) && supported.contains(keyType)) { |
| return decodePublicKey(session, keyType, keyData, headers); |
| } |
| |
| throw new InvalidKeySpecException("resolve(" + keyType + ") not in listed supported types: " + supported); |
| } |
| |
| @Override |
| default PUB decodePublicKeyByType( |
| SessionContext session, String keyType, InputStream keyData, Map<String, String> headers) |
| throws IOException, GeneralSecurityException { |
| // the actual data is preceded by a string that repeats the key type |
| String type = KeyEntryResolver.decodeString(keyData, KeyPairResourceLoader.MAX_KEY_TYPE_NAME_LENGTH); |
| if (GenericUtils.isEmpty(type)) { |
| throw new StreamCorruptedException("Missing key type string"); |
| } |
| |
| Collection<String> supported = getSupportedKeyTypes(); |
| if (GenericUtils.isEmpty(supported) || (!supported.contains(type))) { |
| throw new InvalidKeySpecException("Reported key type (" + type + ") not in supported list: " + supported); |
| } |
| |
| return decodePublicKey(session, type, keyData, headers); |
| } |
| |
| /** |
| * Encodes the {@link PublicKey} using the {@code OpenSSH} format - same one used by the {@code decodePublicKey} |
| * method(s) |
| * |
| * @param s The {@link OutputStream} to write the data to |
| * @param key The {@link PublicKey} - may not be {@code null} |
| * @return The key type value - one of the {@link #getSupportedKeyTypes()} |
| * @throws IOException If failed to generate the encoding |
| */ |
| String encodePublicKey(OutputStream s, PUB key) throws IOException; |
| } |