com.guardtime.ksi.unisignature.verifier.rules.UserProvidedPublicationTimeMatchesExtendedResponseRule 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.publication.PublicationData;
import com.guardtime.ksi.unisignature.CalendarHashChain;
import com.guardtime.ksi.unisignature.KSISignature;
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 user provided publication time matches with extender response calendar chain shape.
 */
public class UserProvidedPublicationTimeMatchesExtendedResponseRule extends BaseRule {

    private static final Logger LOGGER = LoggerFactory.getLogger(UserProvidedPublicationTimeMatchesExtendedResponseRule.class);

    public VerificationResultCode verifySignature(VerificationContext context) throws KSIException {
        PublicationData userPublication = context.getUserProvidedPublication();
        KSISignature signature = context.getSignature();
        CalendarHashChain extendedCalendarHashChain = context.getExtendedCalendarHashChain(userPublication.getPublicationTime());
        // check response time
        Date extendedSignaturePublicationTime = extendedCalendarHashChain.getPublicationTime();
        if (!userPublication.getPublicationTime().equals(extendedSignaturePublicationTime)) {
            LOGGER.info("User provided publication time does not match extender response time. Expected {}, got {}", userPublication.getPublicationTime(), extendedSignaturePublicationTime);
            return VerificationResultCode.FAIL;
        }
        // calculate round time and check that it matches with aggregation hash chain aggregation time
        if (!signature.getAggregationTime().equals(extendedCalendarHashChain.getAggregationTime())) {
            LOGGER.info("Signature aggregation hash chain aggregation time does not math with extender registration time. Expected {}, got {}", signature.getAggregationTime(), extendedCalendarHashChain.getAggregationTime());
            return VerificationResultCode.FAIL;
        }

        return VerificationResultCode.OK;
    }

    public VerificationErrorCode getErrorCode() {
        return VerificationErrorCode.PUB_02;
    }

}