/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

package org.mozilla.jss.pkcs7;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

import org.mozilla.jss.asn1.ASN1Template;
import org.mozilla.jss.asn1.ASN1Value;
import org.mozilla.jss.asn1.INTEGER;
import org.mozilla.jss.asn1.InvalidBERException;
import org.mozilla.jss.asn1.OCTET_STRING;
import org.mozilla.jss.asn1.SEQUENCE;
import org.mozilla.jss.asn1.Tag;
import org.mozilla.jss.pkix.primitive.AlgorithmIdentifier;

public class RecipientInfo implements ASN1Value {

    public static final Tag TAG = SEQUENCE.TAG;
    @Override
    public Tag getTag() {
        return TAG;
    }

    private INTEGER               version;
    private IssuerAndSerialNumber issuerAndSerialNumber;
    private AlgorithmIdentifier   keyEncryptionAlgorithmID;
    private OCTET_STRING          encryptedKey;

    private SEQUENCE sequence = new SEQUENCE();

    public INTEGER getVersion() {
        return version;
    }
    public IssuerAndSerialNumber getissuerAndSerialNumber() {
        return issuerAndSerialNumber;
    }
    public AlgorithmIdentifier getKeyEncryptionAlgorithmID() {
        return keyEncryptionAlgorithmID;
    }
    public OCTET_STRING getEncryptedKey() {
        return encryptedKey;
    }


    private static final Template templateInstance = new Template();

    public static Template getTemplate() {
	return templateInstance;
    }

    /**
     * Create a RecipientInfo ASN1 object.
     */

    public RecipientInfo(  INTEGER version,
			   IssuerAndSerialNumber issuerAndSerialNumber,
			   AlgorithmIdentifier keyEncryptionAlgorithmID,
			   OCTET_STRING encryptedKey) {

	assert(issuerAndSerialNumber != null);
	assert(keyEncryptionAlgorithmID != null);
	assert(encryptedKey != null);


        this.version = version;
        this.issuerAndSerialNumber = issuerAndSerialNumber;
        this.keyEncryptionAlgorithmID = keyEncryptionAlgorithmID;
        this.encryptedKey = encryptedKey;


        sequence.addElement(version);
        sequence.addElement(issuerAndSerialNumber);
        sequence.addElement(keyEncryptionAlgorithmID);
        sequence.addElement(encryptedKey);

    }

    @Override
    public void encode(OutputStream ostream) throws IOException {
        encode(getTag(),ostream);
    }

    @Override
    public void encode(Tag tag, OutputStream ostream) throws IOException {
        sequence.encode(tag,ostream);
    }


    /**
     * A template file for decoding a RecipientInfo blob
     *
     */

    public static class Template implements ASN1Template {
        public Tag getTag() {
            return RecipientInfo.TAG;
        }

        @Override
        public boolean tagMatch(Tag tag) {
            return (tag.equals(RecipientInfo.TAG));
        }

        @Override
        public ASN1Value decode(InputStream istream)
            throws IOException, InvalidBERException
            {
                return decode(getTag(),istream);
            }

        @Override
        public ASN1Value decode(Tag implicitTag, InputStream istream)
            throws IOException, InvalidBERException
            {
                SEQUENCE.Template seqt = new SEQUENCE.Template();
                seqt.addElement(new INTEGER.Template());
                seqt.addElement(new IssuerAndSerialNumber.Template());
                seqt.addElement(new AlgorithmIdentifier.Template());
                seqt.addElement(new OCTET_STRING.Template());

                SEQUENCE seq = (SEQUENCE) seqt.decode(implicitTag,istream);
                assert(seq.size() ==4);

                return new RecipientInfo(
                    (INTEGER)               seq.elementAt(0),
                    (IssuerAndSerialNumber) seq.elementAt(1),
                    (AlgorithmIdentifier)   seq.elementAt(2),
                    (OCTET_STRING)          seq.elementAt(3)

                    );
            }
    } // end of template

}
