// Copyright 2024 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.
//
///////////////////////////////////////////////////////////////////////////////

// Protos for Module-Lattice Key Encapsulation Mechanism algorithm (ML-KEM).
// See https://csrc.nist.gov/pubs/fips/203/ipd.
syntax = "proto3";

package google.crypto.tink;

enum MlKemKeySize {
  ML_KEM_UNKNOWN_SIZE = 0;
  ML_KEM_768 = 1;
}

message MlKemParams {
  // Required.
  MlKemKeySize ml_kem_key_size = 1;
}

message MlKemKeyFormat {
  // Required.
  uint32 version = 1;
  // Required.
  MlKemParams params = 2;
}

// key_type: type.googleapis.com/google.crypto.tink.MlKemPublicKey
message MlKemPublicKey {
  // Required.
  uint32 version = 1;
  // Required.
  bytes key_value = 2;  // Placeholder for ctype.
  // Required.
  MlKemParams params = 3;
}

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