A JavaScript HOTP implementation (HMAC-Based One-Time Password Algorithm) as described in RFC4226. The library uses on crypto-js for the javascript HMAC-SHA1 implementation.
Load the htop.js file, set the private key of the token and the count step.
otp = hotp("3132333435363738393031323334353637383930","4","dec6");The following output formats are supported:
- hex40 - truncated 10 bytes hexadecimal representation
- dec6 - truncated 6 bytes decimal representation (HOTP)
- dec7 - truncated 7 bytes decimal representation
- dec8 - truncated 8 bytes decimal representation
Check this web page that will run in your browser htop-js with the RFC4226 test values.
- If you implement software tokens, don't forget to protect the key of the token along with the count value (e.g. local encryption of the software token).
- Code is experimental.
Copyright (C) 2009 Alexandre Dulaunoy
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as
published by the Free Software Foundation, either version 3 of the
License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.