AesGcm class

Implementação do cipher autenticado AES-GCM (AEAD) — NIST SP 800-38D.

Equivalente moderno ao ChaCha20-Poly1305 para casos que exigem AES.

final key = CryptUtil.generateKey(); // 32 bytes → AES-256
final nonce = Uint8List(12);
Random.secure().nextBytes(nonce);

final gcm = AesGcm(key: key, nonce: nonce, aad: Uint8List(0));
final payload = gcm.encrypt(utf8.encode('texto secreto'));
final texto = utf8.decode(gcm.decrypt(payload));

Constructors

AesGcm({required Uint8List key, required Uint8List nonce, required Uint8List aad})

Cria uma instância de AES-GCM com key, nonce e aad.

const

Properties

aad → Uint8List

Dados adicionais autenticados, preservados em texto claro.

final

hashCode → int

The hash code for this object.

no setter, inherited

key → Uint8List

Chave AES de 16 bytes (AES-128) ou 32 bytes (AES-256).

final

nonce → Uint8List

Nonce de nonceLength bytes, que deve ser único para cada mensagem.

final

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

Methods

decrypt(EncryptedPayload payload) → List<int>

Decifra payload e retorna o plaintext original.

encrypt(List<int> plaintext) → EncryptedPayload

Cifra plaintext e retorna um EncryptedPayload com ciphertext e tag GCM.

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

Constants

nonceLength → const int

Tamanho obrigatório do nonce GCM, em bytes.

tagLength → const int

Tamanho da tag de autenticação produzida pelo GCM, em bytes.