com.guardtime.ksi.unisignature.verifier.rules.InputHashLevelVerificationRule 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.AggregationChainLink;
import com.guardtime.ksi.unisignature.AggregationHashChain;
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 java.util.List;

/**
 * Verifies that user provided input hash level is less than or equal to first aggregation hash chain's first
 * link's level corrector value.
 */
public class InputHashLevelVerificationRule extends BaseRule {

    VerificationResultCode verifySignature(VerificationContext context) throws KSIException {
        Long userSuppliedLevel = context.getInputHashLevel();
        if (userSuppliedLevel == null) {
            return VerificationResultCode.OK;
        }
        Long levelCorrection = getLevelCorrection(context.getSignature());
        return userSuppliedLevel <= levelCorrection ? VerificationResultCode.OK : VerificationResultCode.FAIL;
    }

    private Long getLevelCorrection(KSISignature signature) {
        if (signature.getRfc3161Record() != null) {
            return 0L;
        }
        AggregationHashChain[] aggregationHashChains = signature.getAggregationHashChains();
        AggregationHashChain firstChain = aggregationHashChains[0];
        List chainLinks = firstChain.getChainLinks();
        AggregationChainLink firstLink = chainLinks.get(0);
        return firstLink.getLevelCorrection();
    }

    VerificationErrorCode getErrorCode() {
        return VerificationErrorCode.GEN_03;
    }
}