OTP utility for Google Authenticator
npm install otpThis is a utility to work with Google-Authenticator and compatible OTP-Mechanisms.
- HOTP (HMAC-Based One-Time Password Algorithm): RFC 4226
- TOTP (Time-Based One-Time Password Algorithm): RFC 6238
var otp = new OTP(options);
otp.hotp(counter); // Generates an OTP using HTOP method (Promise)
otp.totp(); // Generates an OTP using TOTP method (Promise)
otp.secret; // Base32 encoded secret
otp.totpURL; // A TOTP-URL that can be used with Google-Authenticator
otp.hotpURL; // A HOTP-URL that can be used with Google-Authenticator
Options can have the following properties:
- name: A name used in generating URLs
- keySize: The size of the OTP-Key (default 64) (possible values: 64 & 128)
- codeLength: The length of the code generated (default 6)
- secret: The secret (either a Buffer of Base32-encoded String)
- epoch: The seconds since Unix-Epoch to use as a base for calculating the TOTP (default 0)
- timeSlice: The timeslice to use for calculating counter from time in seconds (default 30)
Parses an OTP-URL or Base32-Encoded Secret.
A JSON-reviver to revive stringified OTP objects
Copyright (C) 2013-2020 Philipp Dunkel
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