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/*
    This file is part of the iText (R) project.
    Copyright (c) 1998-2023 Apryse Group NV
    Authors: Apryse Software.

    This program is offered under a commercial and under the AGPL license.
    For commercial licensing, contact us at https://itextpdf.com/sales.  For AGPL licensing, see below.

    AGPL licensing:
    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU Affero General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Affero General Public License for more details.

    You should have received a copy of the GNU Affero General Public License
    along with this program.  If not, see .
 */
package com.itextpdf.signatures;

import java.util.Arrays;
import java.util.Collections;
import java.util.LinkedHashSet;
import java.util.Set;

/**
 * Class containing all the OID values used by iText.
 */
public final class OID {

    private OID() {
        // Empty on purpose. Avoiding instantiation of this class.
    }

    /**
     * Contains all OIDs used by iText in the context of Certificate Extensions.
     */
    public static final class X509Extensions {
        /**
         * One of the standard extensions from https://tools.ietf.org/html/rfc5280
         * 
         * "Conforming CAs MUST mark this extension as non-critical."
         */
        public static final String AUTHORITY_KEY_IDENTIFIER = "2.5.29.35";
        /**
         * One of the standard extensions from https://tools.ietf.org/html/rfc5280
         * 

         * "Conforming CAs MUST mark this extension as non-critical."
         */
        public static final String SUBJECT_KEY_IDENTIFIER = "2.5.29.14";
        /**
         * One of the standard extensions from https://tools.ietf.org/html/rfc5280
         */
        public static final String KEY_USAGE = "2.5.29.15";
        /**
         * One of the standard extensions from https://tools.ietf.org/html/rfc5280
         */
        public static final String CERTIFICATE_POLICIES = "2.5.29.32";
        /**
         * One of the standard extensions from https://tools.ietf.org/html/rfc5280
         */
        public static final String POLICY_MAPPINGS = "2.5.29.33";
        /**
         * One of the standard extensions from https://tools.ietf.org/html/rfc5280
         */
        public static final String SUBJECT_ALTERNATIVE_NAME = "2.5.29.17";
        /**
         * One of the standard extensions from https://tools.ietf.org/html/rfc5280
         */
        public static final String ISSUER_ALTERNATIVE_NAME = "2.5.29.18";
        /**
         * One of the standard extensions from https://tools.ietf.org/html/rfc5280
         * 

         * "Conforming CAs MUST mark this extension as non-critical."
         */
        public static final String SUBJECT_DIRECTORY_ATTRIBUTES = "2.5.29.9";
        /**
         * One of the standard extensions from https://tools.ietf.org/html/rfc5280
         */
        public static final String BASIC_CONSTRAINTS = "2.5.29.19";
        /**
         * One of the standard extensions from https://tools.ietf.org/html/rfc5280
         */
        public static final String NAME_CONSTRAINTS = "2.5.29.30";
        /**
         * One of the standard extensions from https://tools.ietf.org/html/rfc5280
         */
        public static final String POLICY_CONSTRAINTS = "2.5.29.36";
        /**
         * One of the standard extensions from https://tools.ietf.org/html/rfc5280
         */
        public static final String EXTENDED_KEY_USAGE = "2.5.29.37";
        /**
         * One of the standard extensions from https://tools.ietf.org/html/rfc5280
         */
        public static final String CRL_DISTRIBUTION_POINTS = "2.5.29.31";
        /**
         * One of the standard extensions from https://tools.ietf.org/html/rfc5280
         */
        public static final String INHIBIT_ANY_POLICY = "2.5.29.54";
        /**
         * One of the standard extensions from https://tools.ietf.org/html/rfc5280
         * 

         * "The extension MUST be marked as non-critical by conforming CAs."
         */
        public static final String FRESHEST_CRL = "2.5.29.46";

        /**
         * One of the Internet Certificate Extensions also from https://tools.ietf.org/html/rfc5280
         * 

         * "The extension MUST be marked as non-critical by conforming CAs."
         */
        public static final String AUTHORITY_INFO_ACCESS = "1.3.6.1.5.5.7.1.1";
        /**
         * One of the Internet Certificate Extensions also from https://tools.ietf.org/html/rfc5280
         * 

         * "Conforming CAs MUST mark this extension as non-critical."
         */
        public static final String SUBJECT_INFO_ACCESS = "1.3.6.1.5.5.7.1.11";


        /**
         * One of the {@link #EXTENDED_KEY_USAGE} purposes from https://www.ietf.org/rfc/rfc2459.txt
         */
        public static final String ID_KP_TIMESTAMPING = "1.3.6.1.5.5.7.3.8";


        /**
         * Extension for OCSP responder certificate
         * from https://www.ietf.org/rfc/rfc2560.txt.
         */
        public static final String ID_PKIX_OCSP_NOCHECK = "1.3.6.1.5.5.7.48.1.5";


        /**
         * According to https://tools.ietf.org/html/rfc5280 4.2. "Certificate Extensions":
         * "A certificate-using system MUST reject the certificate if it encounters a critical extension it
         * does not recognize or a critical extension that contains information that it cannot process."
         * 
         * This set consists of standard extensions which are defined in RFC specifications and are not mentioned
         * as forbidden to be marked as critical.
         */
        public static final Set SUPPORTED_CRITICAL_EXTENSIONS = Collections.unmodifiableSet(new LinkedHashSet<>(Arrays.asList(
                KEY_USAGE,
                CERTIFICATE_POLICIES,
                POLICY_MAPPINGS,
                SUBJECT_ALTERNATIVE_NAME,
                ISSUER_ALTERNATIVE_NAME,
                BASIC_CONSTRAINTS,
                NAME_CONSTRAINTS,
                POLICY_CONSTRAINTS,
                EXTENDED_KEY_USAGE,
                CRL_DISTRIBUTION_POINTS,
                INHIBIT_ANY_POLICY,
                ID_PKIX_OCSP_NOCHECK
        )));
    }
}