otp_util

Description:

otp util

otp_util #
otp_util is a dart package to generate and verify one-time passwords that were used to implement 2FA and MFA authentication method in web applications and other login-required systems.
The package was implement based on RFC4226 (HOTP: An HMAC-Based One-Time Password Algorithm) and RFC6238 (TOTP: Time-Based One-Time Password Algorithm).
Feature #

Create and verify a HOTP object
Create and verify a TOTP object
Generate a otpauth url with the b32 encoded string
Support for OTP tokens encrypted with SHA1, SHA256, SHA384 and SHA512

Installation #
Pubspec
Add otp_util as a dependency in your pubspec.yaml file.
dependencies:
otp_util: ^1.0.2
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Example #
Time-based OTPs
import 'package:dart_otp/dart_otp.dart';

void main() {

/// default initialization for intervals of 30 seconds and 6 digit tokens
TOTP totp = TOTP(secret: "BASE32ENCODEDSECRET");

/// initialization for custom interval and digit values
TOTP totp = TOTP(secret: "BASE32ENCODEDSECRET", interval: 60, digits: 8);

totp.now(); /// => 745872

/// verify for the current time
totp.verify(otp: '745872'); /// => true

/// verify after 30s
totp.verify(otp: '745872'); /// => false
}
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Counter-based OTPs
import 'package:dart_otp/dart_otp.dart';

void main() {

/// default initialization for intervals of 30 seconds and 6 digit tokens
HOTP hotp = HOTP(secret: "BASE32ENCODEDSECRET");

/// initialization for custom counter and digit value
HOTP hotp = HOTP(secret: "BASE32ENCODEDSECRET", counter: 50, digits: 8);

hotp.at(counter: 0); /// => 145089
hotp.at(counter: 1); /// => 899133
hotp.at(counter: 2438); /// => 146071

/// verify with a counter
hotp.verify(otp: '397732', counter: 2438); /// => true
hotp.verify(otp: '397732', counter: 2438); /// => false
}
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Release notes #
See CHANGELOG.md.