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This artifact provides a single jar that contains all classes required to use remote EJB and JMS, including all dependencies. It is intended for use by those not using maven, maven users should just import the EJB and JMS BOM's instead (shaded JAR's cause lots of problems with maven, as it is very easy to inadvertently end up with different versions on classes on the class path).

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/*
 * 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   Type of {@link PublicKey}
 * @param   Type of {@link PrivateKey}
 * @author       Apache MINA SSHD Project
 */
public interface PublicKeyEntryDecoder
        extends KeyEntryResolver, PublicKeyRawDataDecoder, PublicKeyEntryResolver {

    @Override
    default PublicKey resolve(
            SessionContext session, String keyType, byte[] keyData, Map headers)
            throws IOException, GeneralSecurityException {
        ValidateUtils.checkNotNullAndNotEmpty(keyType, "No key type provided");
        Collection 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 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 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;
}