Doogee S55 64Gb+4Gb Dual LTE [110/118] Direct boot

If device implementations support a secure lock screen as described in section 9.11.1 and support

data storage encryption with Advanced Encryption Standard (AES) crypto performance above

50MiB/sec, they:

[C-2-1] MUST enable the data storage encryption by default at the time the user has

completed the out-of-box setup experience. If device implementations are already

launched on an earlier Android version with encryption disabled by default, such a device

cannot meet the requirement through a system software update and thus MAY be

exempted.

SHOULD meet the above data storage encryption requirement via implementing File

Based Encryption (FBE).

9.9.1. Direct Boot

Device implementations:

[C-0-1] MUST implement the Direct Boot mode APIs even if they do not support Storage

Encryption.

[C-0-2] The ACTION_LOCKED_BOOT_COMPLETED and ACTION_USER_UNLOCKED Intents

MUST still be broadcast to signal Direct Boot aware applications that Device Encrypted

(DE) and Credential Encrypted (CE) storage locations are available for user.

9.9.2. File Based Encryption

If device implementations support FBE, they:

[C-1-1] MUST boot up without challenging the user for credentials and allow Direct Boot

aware apps to access to the Device Encrypted (DE) storage after the

ACTION_LOCKED_BOOT_COMPLETED message is broadcasted.

[C-1-2] MUST only allow access to Credential Encrypted (CE) storage after the user has

unlocked the device by supplying their credentials (eg. passcode, pin, pattern or

fingerprint) and the ACTION_USER_UNLOCKED message is broadcasted.

[C-1-3] MUST NOT offer any method to unlock the CE protected storage without the user-

supplied credentials.

[C-1-4] MUST support Verified Boot and ensure that DE keys are cryptographically bound

to the device's hardware root of trust.

[C-1-5] MUST support encrypting file contents using AES with a key length of 256-bits in

XTS mode.

[C-1-6] MUST support encrypting file name using AES with a key length of 256-bits in

CBC-CTS mode.

The keys protecting CE and DE storage areas:

[C-1-7] MUST be cryptographically bound to a hardware-backed Keystore.

[C-1-8] CE keys MUST be bound to a user's lock screen credentials.

[C-1-9] CE keys MUST be bound to a default passcode when the user has not specified

lock screen credentials.

[C-1-10] MUST be unique and distinct, in other words no user's CE or DE key matches any

other user's CE or DE keys.

[C-1-11] MUST use the mandatorily supported ciphers, key lengths and modes by default.

SHOULD make preloaded essential apps (e.g. Alarm, Phone, Messenger) Direct Boot

aware.

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