DVTotp class

Time-based one-time passwords, RFC 6238 over HOTP (RFC 4226).

The defaults — SHA-1, six digits, thirty seconds — are what every authenticator app implements; the others exist because the RFC defines them, not because an app will agree to them.

Constructors

DVTotp({int digits = 6, Duration period = const Duration(seconds: 30), DVTotpAlgorithm algorithm = DVTotpAlgorithm.sha1})

const

Properties

algorithm → DVTotpAlgorithm

final

digits → int

final

hashCode → int

The hash code for this object.

no setter, inherited

period → Duration

final

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

Methods

generate(List<int> secret, {required DateTime at}) → String

The code for secret at at.

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

provisioningUri({required String secret, required String issuer, required String account}) → Uri

The otpauth:// URI an authenticator app reads from a QR code.

stepAt(DateTime at) → int

The time step at falls in.

toString() → String

A string representation of this object.

inherited

verify(String code, List<int> secret, {required DateTime at, int window = 1, int? lastUsedStep}) → int?

The step code was generated for, or null when it matches none within window steps of at — or matches only steps at or before lastUsedStep, which have already been spent.

Operators

operator ==(Object other) → bool

The equality operator.

inherited

Static Methods

base32Decode(String input) → Uint8List

Decodes base32, forgiving the spaces, hyphens, lower case and padding people type when they enter a key by hand.

base32Encode(List<int> bytes) → String

RFC 4648 base32 without padding: what authenticator apps are given.