com.guardtime.ksi.unisignature.CalendarHashChainLink 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;
import com.guardtime.ksi.hashing.DataHash;
import com.guardtime.ksi.unisignature.inmemory.InvalidCalendarHashChainException;
/**
* Interface for calendar hash chain links. A calendar chain defines a computation performed starting from the first
* hash step (a left or right link structure) and ending with the last one, in the order in which the steps are given in
* the sequence.
*/
public interface CalendarHashChainLink {
DataHash calculateChainStep(DataHash previous) throws InvalidCalendarHashChainException;
boolean isRightLink();
DataHash getDataHash();
}