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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 javax.security.auth.message.callback;

import java.math.BigInteger;
import java.security.PrivateKey;
import java.security.cert.Certificate;

import javax.security.auth.callback.Callback;
import javax.security.auth.x500.X500Principal;

/**
 * Callback that enables an authentication module to request a certificate chain
 * and private key from the runtime. The information specifying the chain and
 * key may be an alias, a digest, a subject key, or an issuer ID. Other request
 * types may be supported.
 */
public class PrivateKeyCallback implements Callback {

    private final Request request;
    private Certificate[] chain;
    private PrivateKey key;

    public PrivateKeyCallback(Request request) {
        this.request = request;
    }

    public Request getRequest() {
        return request;
    }

    public void setKey(PrivateKey key, Certificate[] chain) {
        this.key = key;
        this.chain = chain;
    }

    public PrivateKey getKey() {
        return key;
    }

    public Certificate[] getChain() {
        return chain;
    }

    public static interface Request {
    }

    public static class AliasRequest implements Request {

        private final String alias;

        public AliasRequest(String alias) {
            this.alias = alias;
        }

        public String getAlias() {
            return alias;
        }
    }

    public static class DigestRequest implements Request {
        private final byte[] digest;
        private final String algorithm;

        public DigestRequest(byte[] digest, String algorithm) {
            this.digest = digest;
            this.algorithm = algorithm;
        }

        public byte[] getDigest() {
            return digest;
        }

        public String getAlgorithm() {
            return algorithm;
        }
    }

    public static class SubjectKeyIDRequest implements Request {

        private final byte[] subjectKeyID;

        public SubjectKeyIDRequest(byte[] subjectKeyID) {
            this.subjectKeyID = subjectKeyID;
        }

        public byte[] getSubjectKeyID() {
            return subjectKeyID;
        }
    }

    public static class IssuerSerialNumRequest implements Request {
        private final X500Principal issuer;
        private final BigInteger serialNum;

        public IssuerSerialNumRequest(X500Principal issuer, BigInteger serialNum) {
            this.issuer = issuer;
            this.serialNum = serialNum;
        }

        public X500Principal getIssuer() {
            return issuer;
        }

        public BigInteger getSerialNum() {
            return serialNum;
        }
    }
}