If a time delay is required, a VerificationWindow object can be provided that describes the acceptable range of values to check. The Node One Time Password library is fully compliant with HOTP (counter based one time passwords) and TOTP (time based one time passwords). The best open source alternative to Authy is Aegis Authenticator. Multi-Factor Authentication (MFA) 9 of 26 Authy alternatives. Simply omitting the optional parameter will cause this default behavior. Time-based One-time Password FreeOTP+ (fork of FreeOTP) has support for TOTP, a computer algorithm that generates Time-based One-Time Passwords. The default is that no delay will be accepted and the code must match the current code in order to be considered a match. The actual step where the match was found will be reported in the aforementioned output parameter. nodejs otp browser two-factor hotp authenticator hmac google-authenticator two-factor-authentication 2fa one-time-passwords Resources. This parameter allows you to define the window of steps that are considered acceptable. One Time Password (OTP) / 2FA for Node.js and Browser - Supports HOTP, TOTP and Google Authenticator. The VerifyTotp method takes an optional VerificationWindow parameter. The exact text in the RFC is "We RECOMMEND that at most one time step is allowed as the network delay." RFC 6238 Section 5.2 defines the recommended conditions for accepting a TOTP validation code. This library will only go so far as to determine that there was a valid code provided given the current time and the key, not that it was truly used one time as this library has no persistence. It is up to the consumer of this library to ensure that only one match for a given time step window is actually accepted. The output parameter reports the specific time window where the match occured for persistance comparison in future verification attempts. RFC 6238 Section 5.2 states that a code must only be accepted once. This is provided so that the caller of the function can persist/check that the code has only been validated once. There is an output long called timeWindowUsed. If the overload that doesn't take a timestamp is called, DateTime.UtcNow will be used as the comperand. The inbuilt search feature helps to find any account in seconds. Organise via Labels With the inbuilt labels, you can easily group and manage a large number of accounts. Public bool VerifyTotp ( string totp, out long timeWindowUsed, VerificationWindow window = null ) public bool VerifyTotp ( DateTime timestamp, string totp, out long timeWindowUsed, VerificationWindow window = null ) Easily change between the light and dark mode in the app and widget.
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