com.guardtime.ksi.unisignature.verifier.rules.CalendarHashChainAggregationAlgorithmObsoleteRule Maven / Gradle / Ivy

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/*
 * Copyright 2013-2018 Guardtime, Inc.
 *
 *  This file is part of the Guardtime client SDK.
 *
 *  Licensed 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, CONDITIONS, OR OTHER LICENSES OF ANY KIND, either
 *  express or implied. See the License for the specific language governing
 *  permissions and limitations under the License.
 *  "Guardtime" and "KSI" are trademarks or registered trademarks of
 *  Guardtime, Inc., and no license to trademarks is granted; Guardtime
 *  reserves and retains all trademark rights.
 *
 */

package com.guardtime.ksi.unisignature.verifier.rules;

import com.guardtime.ksi.exceptions.KSIException;
import com.guardtime.ksi.unisignature.CalendarHashChainLink;
import com.guardtime.ksi.unisignature.verifier.VerificationContext;
import com.guardtime.ksi.unisignature.verifier.VerificationErrorCode;
import com.guardtime.ksi.unisignature.verifier.VerificationResultCode;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.Date;

/**
 * Verifies that calendar hash chain aggregation(derived from the left link) hash algorithms were
 * obsolete at the publication time. If calendar hash chain is missing then status {@link
 * VerificationResultCode#OK} will be returned.
 */
public class CalendarHashChainAggregationAlgorithmObsoleteRule extends BaseRule {

    private static final Logger logger = LoggerFactory.getLogger(CalendarHashChainAggregationAlgorithmObsoleteRule.class);

    public VerificationResultCode verifySignature(VerificationContext context) throws KSIException {
        if (context.getCalendarHashChain() == null) {
            return VerificationResultCode.OK;
        }

        Date publicationTime = context.getSignature().getPublicationTime();
        for (CalendarHashChainLink link : context.getCalendarHashChain().getChainLinks()) {
            if (!link.isRightLink() && link.getDataHash().getAlgorithm().isObsolete(publicationTime)) {
                logger.info("Calendar hash chain contains obsolete aggregation algorithm {} at publication time {}",
                        link.getDataHash().getAlgorithm(), publicationTime);
                return VerificationResultCode.FAIL;
            }
        }
        return VerificationResultCode.OK;
    }

    public VerificationErrorCode getErrorCode() {
        return VerificationErrorCode.INT_16;
    }

}