verify.proto

/*
 * Copyright (c) DeRec Alliance and its Contributors.
 *
 * 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 OR CONDITIONS OF ANY KIND, either express or implied.
 *
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

syntax = "proto3";
import "result.proto";

package org.derecalliance.derec.protobuf;

/*
* ----------------------------------------------------------------------------
* The sharer is asking the helper whether they have a particular version of
* the share, which they will have to cryptographically prove.
* ----------------------------------------------------------------------------
*/
message VerifyShareRequestMessage {
  /*
   * which share version is being verified?
   */
  int32 version = 1;

  /*
   * 256-bit nonce that serves as the challenge.
   * This is randomly chosen for each request.
   */
  bytes nonce = 2;
}

/* response in the challenge-response proof that the stored share is correct */
message VerifyShareResponseMessage {
  /* the success or failure of processing the request */
  Result result = 1;

  /*
   * which version is the response for?
   */
  int32 version = 2;

  /**
    * 256-bit nonce that was used in the challenge
    */
  bytes nonce = 3;

  /**
   * response: sha384 hash of concatenation of the following:
   * (committedDeRecShare, nonce)
   */
  bytes hash = 4;
}