// Copyright 2011 The ChromiumOS Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

syntax = "proto2";

package chaps;
option optimize_for = LITE_RUNTIME;

// Attribute message corresponds to a CK_ATTRIBUTE type in PKCS#11 as defined in
// the PKCS#11 specification.
// See documentation on CK_ATTRIBUTE struct in "3.4 Object types" of PKCS#11
// v3.1 specification:
// https://docs.oasis-open.org/pkcs11/pkcs11-spec/v3.1/os/pkcs11-spec-v3.1-os.html#_Toc111203194
message Attribute {
  // `type` is the attribute type, corresponding to CK_ATTRIBUTE_TYPE in
  // PKCS#11.
  required uint32 type = 1;
  // `value` is a byte array that contains the attribute value.
  optional bytes value = 2;
  // `length` is the size of the `value` byte array. Note that in some usages of
  // the PKCS#11 API the caller can intentionally set this length field to 0 to
  // query the output size, so it cannot be simply inferred from `value`.
  optional sint32 length = 3;
}

// AttributeList is a list of attributes, or more commonly known as a PKCS#11
// "template". This is usually used as one of the parameters in PKCS#11 calls.
message AttributeList {
  repeated Attribute attributes = 1;
}