// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
//
// Sync protocol datatype extension for nigori keys.

// If you change or add any fields in this file, update proto_visitors.h and
// potentially proto_enum_conversions.{h, cc}.

syntax = "proto2";

option go_package = "./sync_pb";

option java_multiple_files = true;
option java_package = "org.chromium.components.sync.protocol";

option optimize_for = LITE_RUNTIME;

package sync_pb;

import "encryption.proto";

message NigoriKey {
  // Note that M78 and before rely on the name being populated, at least for
  // the main encrypted keybag within NigoriSpecifics.
  optional string deprecated_name = 1 [deprecated = true];
  optional bytes deprecated_user_key = 2 [deprecated = true];
  optional bytes encryption_key = 3;
  optional bytes mac_key = 4;
}

message CrossUserSharingPrivateKey {
  // The key version, used for key rotation.
  optional int32 version = 1;
  // Private key on Curve25519 (32 bytes).
  optional bytes x25519_private_key = 2;
}

message CrossUserSharingPublicKey {
  // The key version, used for key rotation and consensus.
  optional int32 version = 1;
  // Public key on Curve25519 (32 bytes).
  optional bytes x25519_public_key = 2;
}

message EncryptionKeys {
  // Used for encrypting data in the user's account.
  repeated NigoriKey key = 2;
  // Used for encrypting/authenticating using Public-private cryptography
  // primarily across user accounts, e.g. sharing invitations.
  repeated CrossUserSharingPrivateKey cross_user_sharing_private_key = 3;
}

// Deprecated: use EncryptionKeys instead.
message NigoriKeyBag {
  option deprecated = true;

  // Used for encrypting data in the user's account.
  repeated NigoriKey key = 2;
}

// Properties of nigori sync object.
message NigoriSpecifics {
  // Encrypted proto of type EncryptionKeys.
  optional EncryptedData encryption_keybag = 1;
  // Once keystore migration is performed, we have to freeze the keybag so that
  // older clients (that don't support keystore encryption) do not attempt to
  // update the keybag.
  // Previously |using_explicit_passphrase|.
  optional bool keybag_is_frozen = 2;

  // Obsolete encryption fields. These were deprecated due to legacy versions
  // that understand their usage but did not perform encryption properly.
  reserved 3;
  reserved "deprecated_encrypt_bookmarks";
  reserved 4;
  reserved "deprecated_encrypt_preferences";
  reserved 5;
  reserved "deprecated_encrypt_autofill_profile";
  reserved 6;
  reserved "deprecated_encrypt_autofill";
  reserved 7;
  reserved "deprecated_encrypt_themes";
  reserved 8;
  reserved "deprecated_encrypt_typed_urls";
  reserved 9;
  reserved "deprecated_encrypt_extensions";
  reserved 10;
  reserved "deprecated_encrypt_sessions";
  reserved 11;
  reserved "deprecated_encrypt_apps";
  reserved 12;
  reserved "deprecated_encrypt_search_engines";

  // Booleans corresponding to whether a datatype should be encrypted.
  // Passwords and Wi-Fi configurations are always encrypted, so we don't need
  // a field here.  History delete directives need to be consumable by the
  // server, and thus can't be encrypted.
  // USS clients don't read these values, datatypes are either always encrypted,
  // never encrypted or encrypted when |encrypt_everything| set to true.
  // TODO(crbug.com/1360022): complete deprecation of encrypt_* fields (replace
  // fields with reserved) once <M82 clients aren't supported.
  optional bool encrypt_bookmarks = 13 [deprecated = true];
  optional bool encrypt_preferences = 14 [deprecated = true];
  optional bool encrypt_autofill_profile = 15 [deprecated = true];
  optional bool encrypt_autofill = 16 [deprecated = true];
  optional bool encrypt_themes = 17 [deprecated = true];
  optional bool encrypt_typed_urls = 18 [deprecated = true];
  optional bool encrypt_extensions = 19 [deprecated = true];
  optional bool encrypt_sessions = 20 [deprecated = true];
  optional bool encrypt_apps = 21 [deprecated = true];
  optional bool encrypt_search_engines = 22 [deprecated = true];

  // Deprecated on clients where tab sync is enabled by default.
  reserved 23;
  reserved "sync_tabs";

  // If true, all current and future datatypes will be encrypted.
  optional bool encrypt_everything = 24;

  optional bool encrypt_extension_settings = 25 [deprecated = true];

  optional bool encrypt_app_notifications = 26 [deprecated = true];

  optional bool encrypt_app_settings = 27 [deprecated = true];

  // User device information. Contains information about each device that has a
  // sync-enabled Chrome browser connected to the user account.
  // This has been moved to the DeviceInfo message.
  reserved 28;
  reserved "deprecated_device_information";

  // Enable syncing favicons as part of tab sync.
  optional bool sync_tab_favicons = 29;

  // The state of the passphrase required to decrypt |encryption_keybag|.
  enum PassphraseType {
    // Proto enums should begin with an 'unknown' value for switch statements,
    // unknown fields, etc.
    UNKNOWN = 0;
    // Gaia-based encryption passphrase. Legacy.
    IMPLICIT_PASSPHRASE = 1;
    // Keystore key encryption passphrase. Uses |keystore_bootstrap| to
    // decrypt |encryption_keybag|.
    KEYSTORE_PASSPHRASE = 2;
    // Previous Gaia-based passphrase frozen and treated as a custom passphrase.
    FROZEN_IMPLICIT_PASSPHRASE = 3;
    // User provided custom passphrase.
    CUSTOM_PASSPHRASE = 4;
    // Encryption key provided by a trusted vault.
    TRUSTED_VAULT_PASSPHRASE = 5;
  }

  // An |int| field is used instead of enum PassphraseType so we can better
  // handle unknown values coming from later versions. Prior to M77, this was an
  // enum so old clients will assume IMPLICIT_PASSPHRASE for values greater than
  // 4.
  optional int32 passphrase_type = 30 [default = 1];

  // The keystore decryptor token blob. Encrypted with the keystore key, and
  // contains the encryption key used to decrypt |encryption_keybag|.
  // Only set if passphrase_state == KEYSTORE_PASSPHRASE.
  optional EncryptedData keystore_decryptor_token = 31;

  // The time (in milliseconds since Unix epoch) at which the keystore migration
  // was performed.
  optional int64 keystore_migration_time = 32;

  // The time (in milliseconds since Unix epoch) at which a custom passphrase
  // was set. Note: this field may not be set if the custom passphrase was
  // applied before this field was introduced.
  optional int64 custom_passphrase_time = 33;

  // Boolean corresponding to whether custom spelling dictionary should be
  // encrypted.
  optional bool encrypt_dictionary = 34;

  reserved 35;
  reserved 36;

  reserved 37;
  reserved "encrypt_articles";

  // Boolean corresponding to whether app list items should be encrypted.
  optional bool encrypt_app_list = 38 [deprecated = true];

  // Boolean corresponding to whether usage count and last use date of Wallet
  // data should be encrypted.
  optional bool encrypt_autofill_wallet_metadata = 39 [deprecated = true];

  // Boolean indicating whether this node was originally missing a
  // |keystore_migration_time| field value, and was fixed on the server by
  // giving the field a value.
  // THIS FIELD SHOULD ONLY BE SET BY THE SERVER.
  optional bool server_only_was_missing_keystore_migration_time = 40;

  // Boolean corresponding to whether arc pakcage items should be encrypted.
  optional bool encrypt_arc_package = 41 [deprecated = true];

  // Boolean corresponding to whether printer items should be encrypted.
  optional bool encrypt_printers = 42 [deprecated = true];

  // Boolean corresponding to whether reading list items should be encrypted.
  optional bool encrypt_reading_list = 43 [deprecated = true];

  reserved 44;
  reserved "encrypt_mountain_shares";

  enum KeyDerivationMethod {
    // This comes from a <= M69 client, who does not know about the field
    // (but implicitly uses PBKDF2_HMAC_SHA1_1003).
    UNSPECIFIED = 0;
    // PBKDF2-HMAC-SHA1 with 1003 iterations and constant hardcoded salt. Was
    // implicitly used in <= M69.
    PBKDF2_HMAC_SHA1_1003 = 1;
    // scrypt with N = 2^13, r = 8, p = 11 and random salt. Was added in M70.
    SCRYPT_8192_8_11 = 2;
  }

  // ID of the method used to derive the encryption key from a custom
  // passphrase. Should be set only when |passphrase_type| is CUSTOM_PASSPHRASE
  // and only based on CustomPassphraseKeyDerivationMethod. This field has been
  // added in M70. All previous versions just ignore it, attempt to use
  // PBKDF2_HMAC_SHA1_1003 and, thus, reject any passphrase if a different
  // method has been used. The default corresponds to UNSPECIFIED. An |int|
  // field is used so we can detect unknown values coming from later versions.
  optional int32 custom_passphrase_key_derivation_method = 45 [default = 0];

  // Base64-encoded salt used for the derivation of the key from the custom
  // passphrase. Valid only if custom_passphrase_key_derivation_method ==
  // SCRYPT_8192_8_11, ignored in other cases.
  optional string custom_passphrase_key_derivation_salt = 46;

  // Boolean corresponding to whether send tab should be encrypted.
  optional bool encrypt_send_tab_to_self = 47 [deprecated = true];

  // Boolean corresponding to whether Web Apps data should be encrypted.
  optional bool encrypt_web_apps = 48 [deprecated = true];

  // Boolean corresponding to whether OS preferences should be encrypted.
  optional bool encrypt_os_preferences = 49 [deprecated = true];

  // Information useful for auto-upgrade to trusted vault.
  message AutoUpgradeDebugInfo {
    enum AutoUpgradeState {
      STATE_UNSPECIFIED = 0;
      AUTO_UPGRADED = 1;
      CONTROL = 2;
      VALIDATION = 3;
    }
    // Current state of an account after it was processed by auto-upgrade.
    optional AutoUpgradeState auto_upgrade_state = 1;

    // Each eligibility group can be ramped in different stages (e.g. 1%,
    // 10%, 100%).
    // Every ramp stage is differentiated with its own entry in the enum.
    enum EligibilityGroup {
      GROUP_UNSPECIFIED = 0;
      TEST_GROUP_1 = 1;
    }
    // ID of eligibility group account belongs to. Only use IDs defined
    // within EligibilityGroup enum.
    optional int32 eligibility_group_id = 2;
  }

  // Some debug-only fields for passphrase type TRUSTED_VAULT_PASSPHRASE.
  message TrustedVaultDebugInfo {
    // The time (in milliseconds since Unix epoch) at which the trusted vault
    // migration was performed.
    optional int64 migration_time = 1;

    // The version (aka key epoch) corresponding to the Nigori keybag.
    optional int32 key_version = 2;

    // DebugInfo written by a process that auto-upgrades to trusted vault.
    optional AutoUpgradeDebugInfo auto_upgrade_debug_info = 3;

    // The time (in milliseconds since Unix epoch) last update of the auto
    // upgrade debug info was made.
    optional int64
      auto_upgrade_debug_info_modification_time_unix_epoch_millis = 4;
  }

  optional TrustedVaultDebugInfo trusted_vault_debug_info = 50;

  reserved 51;
  reserved "encrypt_workspace_desk";

  reserved 52;
  reserved "encrypt_printers_authorization_servers";

  // Current cross user sharing Public-key to expose in server registry
  // for sharing offers outside account boundary.
  optional CrossUserSharingPublicKey cross_user_sharing_public_key = 53;
}