// Copyright 2021 Google LLC
//
// 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";

package google.crypto.tink;

enum SphincsHashType {
  HASH_TYPE_UNSPECIFIED = 0;
  HARAKA = 1;
  SHA256 = 2;
  SHAKE256 = 3;
}

enum SphincsVariant {
  VARIANT_UNSPECIFIED = 0;
  ROBUST = 1;
  SIMPLE = 2;
}

enum SphincsSignatureType {
  SIG_TYPE_UNSPECIFIED = 0;
  FAST_SIGNING = 1;
  SMALL_SIGNATURE = 2;
}

// Protos for Sphincs Digital Signature Algorithm.
message SphincsParams {
  // Required
  int32 key_size = 1;
  // Required.
  SphincsHashType hash_type = 2;
  // Required.
  SphincsVariant variant = 3;
  // Required.
  SphincsSignatureType sig_length_type = 4;
}

message SphincsKeyFormat {
  uint32 version = 1;
  // Required.
  SphincsParams params = 2;
}

// key_type: type.googleapis.com/google.crypto.tink.SphincsPublicKey
message SphincsPublicKey {
  // Required.
  uint32 version = 1;
  // Required.
  bytes key_value = 2;
  // Required
  SphincsParams params = 3;
}

// key_type: type.googleapis.com/google.crypto.tink.SphincsPrivateKey
message SphincsPrivateKey {
  // Required.
  uint32 version = 1;
  // Required.
  bytes key_value = 2;
  // The corresponding public key.
  SphincsPublicKey public_key = 3;
}