syntax = "proto3";
package proto;

import "google/protobuf/timestamp.proto";

message SignRequest {
  bytes key = 1;
  google.protobuf.Timestamp valid_until = 2;
  string message = 3;
}

message SignResponse {
  bytes cert = 1;
}

service Signer {
  rpc Sign(SignRequest) returns (SignResponse) {}
}