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X.509-Attacker is a tool based on ASN.1 Tool for creating arbitrary certificates; including especially invalid and malformed certificates. Since X.509 certificates encode their contents in ASN.1, this tool extends the features of ASN.1 Tool in terms of certificate signing. Also, X.509-Attacker introduces a feature of referencing XML elements in order to avoid redundancies when defining certificates in XML.

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/*
 * X.509-Attacker - A Library for Arbitrary X.509 Certificates
 *
 * Copyright 2014-2023 Ruhr University Bochum, Paderborn University, Technology Innovation Institute, and Hackmanit GmbH
 *
 * Licensed under Apache License, Version 2.0
 * http://www.apache.org/licenses/LICENSE-2.0.txt
 */
package de.rub.nds.x509attacker.x509.parser;

import de.rub.nds.asn1.parser.ParserHelper;
import de.rub.nds.x509attacker.chooser.X509Chooser;
import de.rub.nds.x509attacker.constants.X509PublicKeyType;
import de.rub.nds.x509attacker.x509.model.SubjectPublicKeyAlgorithmIdentifier;
import de.rub.nds.x509attacker.x509.model.publickey.parameters.PublicParameters;
import de.rub.nds.x509attacker.x509.model.publickey.parameters.X509DhParameters;
import de.rub.nds.x509attacker.x509.model.publickey.parameters.X509DssParameters;
import de.rub.nds.x509attacker.x509.model.publickey.parameters.X509EcNamedCurveParameters;
import de.rub.nds.x509attacker.x509.model.publickey.parameters.X509NullParameters;
import java.io.BufferedInputStream;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;

public class SubjectPublicKeyAlgorithmIdentifierParser
        extends X509ComponentContainerParser {

    private static final Logger LOGGER = LogManager.getLogger();

    public SubjectPublicKeyAlgorithmIdentifierParser(
            X509Chooser chooser, SubjectPublicKeyAlgorithmIdentifier algorithmIdentifier) {
        super(chooser, algorithmIdentifier);
    }

    @Override
    protected void parseSubcomponents(BufferedInputStream inputStream) {
        LOGGER.debug("Parsing SubjectPublicKeyAlgorithmIdentifier");
        ParserHelper.parseAsn1ObjectIdentifier(encodable.getAlgorithm(), inputStream);
        PublicParameters parameters;
        X509PublicKeyType publicKeyType =
                X509PublicKeyType.decodeFromOidBytes(
                        encodable.getAlgorithm().getValueAsOid().getEncoded());
        LOGGER.debug(
                "X509PublicKeyType: {} ({})",
                publicKeyType,
                publicKeyType == null ? "unknown" : publicKeyType.name());
        if (publicKeyType == null) {
            LOGGER.debug("Unknown public key type. Not parsing parameters");
            return;
        }
        switch (publicKeyType) {
            case ECDH_ECDSA:
                parameters = new X509EcNamedCurveParameters("EcNamedCurveParameters");
                break;
            case DH:
                parameters = new X509DhParameters("DhParameters");
                break;
            case DSA:
                parameters = new X509DssParameters("DssParameters");
                break;
            case RSA:
                parameters = new X509NullParameters("nullParameters");
                break;
            default:
                throw new UnsupportedOperationException(
                        "Unknown SubjectPublicKeyAlgorithmIdentifier: " + publicKeyType.name());
        }
        LOGGER.debug("Expecting {}", parameters.getClass().getSimpleName());
        parameters.getParser(chooser).parse(inputStream);
        parameters.getHandler(chooser).adjustContextAfterParse();
        encodable.setParameters(parameters);
    }
}