cryptohome/cryptohome_common.h

// Copyright (c) 2012 The Chromium OS Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef CRYPTOHOME_CRYPTOHOME_COMMON_H_
#define CRYPTOHOME_CRYPTOHOME_COMMON_H_

#include <stdint.h>

namespace cryptohome {

// Constants used in both service.cc and userdataauth.cc
static constexpr char kPublicMountSaltFilePath[] = "/var/lib/public_mount_salt";
static constexpr int kUploadAlertsPeriodMS = 1000 * 60 * 60 * 6;    // 6 hours
static constexpr int kAutoCleanupPeriodMS = 1000 * 60 * 60;         // 1 hour
static constexpr int kUpdateUserActivityPeriodHours = 24;           // daily
static constexpr int kLowDiskNotificationPeriodMS = 1000 * 60 * 1;  // 1 minute

static constexpr int kDefaultRandomSeedLength = 64;
// The default entropy source to seed with random data from the TPM on startup.
static constexpr char kDefaultEntropySourcePath[] = "/dev/urandom";

static constexpr int kDefaultDataRestoreKeyLength = 32;
static constexpr char kDataRestoreKeyLabel[] = "DataRestoreKey";

// The default symmetric key size for cryptohome is the ecryptfs default
#define CRYPTOHOME_DEFAULT_KEY_SIZE 64           // ECRYPTFS_MAX_KEY_BYTES
#define CRYPTOHOME_DEFAULT_KEY_SIGNATURE_SIZE 8  // ECRYPTFS_SIG_SIZE
#define CRYPTOHOME_DEFAULT_KEY_SALT_SIZE 8       // ECRYPTFS_SALT_SIZE
#define CRYPTOHOME_AES_KEY_BYTES 16              // ECRYPTFS_AES_KEY_BYTES
// The default salt length for the user salt
#define CRYPTOHOME_DEFAULT_SALT_LENGTH 16
#define CRYPTOHOME_PWNAME_BUF_LENGTH 1024
#define CRYPTOHOME_CHAPS_KEY_LENGTH 16  // AES block size
#define CRYPTOHOME_RESET_SEED_LENGTH 32

struct VaultKeysetKeys {
  unsigned char fek[CRYPTOHOME_DEFAULT_KEY_SIZE];
  unsigned char fek_sig[CRYPTOHOME_DEFAULT_KEY_SIGNATURE_SIZE];
  unsigned char fek_salt[CRYPTOHOME_DEFAULT_KEY_SALT_SIZE];
  unsigned char fnek[CRYPTOHOME_DEFAULT_KEY_SIZE];
  unsigned char fnek_sig[CRYPTOHOME_DEFAULT_KEY_SIGNATURE_SIZE];
  unsigned char fnek_salt[CRYPTOHOME_DEFAULT_KEY_SALT_SIZE];
} __attribute__((__packed__));
typedef struct VaultKeysetKeys VaultKeysetKeys;

}  // namespace cryptohome

#endif  // CRYPTOHOME_CRYPTOHOME_COMMON_H_