AppCacheSecurity class

Handles AES-CBC encryption/decryption for the image cache.

Design:

• Key: Derived from the user-provided LikeConfig.encryptionKey via SHA-256, or auto-generated as a cryptographically random 32-byte key persisted in SharedPreferences (unique per device/install).
• IV: A fresh random 16-byte IV is generated for every file encryption and prepended to the ciphertext (layout: ciphertext). This means each file is independently and correctly decryptable with no shared state or IV reuse weaknesses.

Initialization: Call AppCacheSecurity.init inside LikeService.init before any file downloads occur.

Constructors

AppCacheSecurity()

Properties

hashCode → int

The hash code for this object.

no setter, inherited

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

Methods

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

toString() → String

A string representation of this object.

inherited

Operators

operator ==(Object other) → bool

The equality operator.

inherited

Static Methods

decryptBytes(Uint8List encryptedBytes) → Uint8List

Decrypts encrypted bytes in-memory and returns the raw decrypted bytes.

decryptFile(File encryptedFile) → Future<File>

Decrypts a file whose content was produced by encryptBytes.

encryptBytes(Uint8List bytes) → Uint8List

Encrypts bytes with a freshly generated random IV.

init() → Future<void>

Initializes the encryption engine.

reset() → void

Resets the encryption state. For testing only.