| /* |
| * 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.util.buffer.keys; |
| |
| import java.security.GeneralSecurityException; |
| import java.security.KeyFactory; |
| import java.security.PublicKey; |
| import java.security.spec.InvalidKeySpecException; |
| import java.security.spec.KeySpec; |
| import java.util.Arrays; |
| import java.util.Collection; |
| import java.util.Collections; |
| import java.util.Objects; |
| |
| import org.apache.sshd.common.util.GenericUtils; |
| import org.apache.sshd.common.util.ValidateUtils; |
| import org.apache.sshd.common.util.security.SecurityUtils; |
| |
| /** |
| * @param <PUB> Type of {@link PublicKey} being extracted |
| * @author <a href="mailto:dev@mina.apache.org">Apache MINA SSHD Project</a> |
| */ |
| public abstract class AbstractBufferPublicKeyParser<PUB extends PublicKey> implements BufferPublicKeyParser<PUB> { |
| private final Class<PUB> keyClass; |
| private final Collection<String> supported; |
| |
| protected AbstractBufferPublicKeyParser(Class<PUB> keyClass, String... supported) { |
| this(keyClass, GenericUtils.isEmpty(supported) ? Collections.emptyList() : Arrays.asList(supported)); |
| } |
| |
| protected AbstractBufferPublicKeyParser(Class<PUB> keyClass, Collection<String> supported) { |
| this.keyClass = Objects.requireNonNull(keyClass, "No key class"); |
| this.supported |
| = ValidateUtils.checkNotNullAndNotEmpty(supported, "No supported types for %s", keyClass.getSimpleName()); |
| } |
| |
| public Collection<String> getSupportedKeyTypes() { |
| return supported; |
| } |
| |
| public final Class<PUB> getKeyClass() { |
| return keyClass; |
| } |
| |
| @Override |
| public boolean isKeyTypeSupported(String keyType) { |
| Collection<String> keys = getSupportedKeyTypes(); |
| return (GenericUtils.length(keyType) > 0) |
| && (GenericUtils.size(keys) > 0) |
| && keys.contains(keyType); |
| } |
| |
| protected <S extends KeySpec> PUB generatePublicKey(String algorithm, S keySpec) throws GeneralSecurityException { |
| KeyFactory keyFactory = getKeyFactory(algorithm); |
| PublicKey key = keyFactory.generatePublic(keySpec); |
| Class<PUB> kc = getKeyClass(); |
| if (!kc.isInstance(key)) { |
| throw new InvalidKeySpecException( |
| "Mismatched generated key types: expected=" + kc.getSimpleName() + ", actual=" + key); |
| } |
| |
| return kc.cast(key); |
| } |
| |
| protected KeyFactory getKeyFactory(String algorithm) throws GeneralSecurityException { |
| return SecurityUtils.getKeyFactory(algorithm); |
| } |
| |
| @Override |
| public String toString() { |
| return getClass().getSimpleName() + " - supported=" + getSupportedKeyTypes(); |
| } |
| } |