system/dev/tee/optee/util.h

// Copyright 2018 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#pragma once

#include <inttypes.h>
#include <stddef.h>

#include <fuchsia/hardware/tee/c/fidl.h>

namespace optee {

// Uuid
//
// Helper class for converting between the various representations of UUIDs. It is intended to
// remain consistent with the RFC 4122 definition of UUIDs. The UUID is 128 bits made up of 32
// bit time low, 16 bit time mid, 16 bit time high and 64 bit clock sequence and node fields. RFC
// 4122 states that when encoding a UUID as a sequence of bytes, each field will be encoded in
// network byte order. This class stores the data as a sequence of bytes.
struct Uuid final {
public:
    explicit Uuid(const fuchsia_hardware_tee_Uuid& zx_uuid);

    void ToUint64Pair(uint64_t* out_hi, uint64_t* out_low) const;

private:
    static constexpr size_t kUuidSize = 16;
    uint8_t data_[kUuidSize];
};

static_assert(sizeof(Uuid) == 16, "Uuid must remain exactly 16 bytes");

} // namespace optee