// 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
//
//    https://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 s2a.proto;

option go_package = "github.com/google/s2a/internal/proto/s2a_context_go_proto";

import "internal/proto/common/common.proto";

message S2AContext {
  // The application protocol negotiated for this connection, e.g., 'grpc'.
  string application_protocol = 1;

  // The TLS version number that the S2A's handshaker module used to set up the
  // session.
  TLSVersion tls_version = 2;

  // The TLS ciphersuite negotiated by the S2A's handshaker module.
  Ciphersuite ciphersuite = 3;

  // The authenticated identity of the peer.
  Identity peer_identity = 4;

  // The local identity used during session setup. This could be:
  // - The local identity that the client specifies in ClientSessionStartReq.
  // - One of the local identities that the server specifies in
  //   ServerSessionStartReq.
  // - If neither client or server specifies local identities, the S2A picks the
  //   default one. In this case, this field will contain that identity.
  Identity local_identity = 5;

  // The SHA256 hash of the peer certificate used in the handshake.
  bytes peer_cert_fingerprint = 6;

  // The SHA256 hash of the local certificate used in the handshake.
  bytes local_cert_fingerprint = 7;

  // Set to true if a cached session was reused to resume the handshake.
  bool is_handshake_resumed = 8;
}