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A simple Javascript HOTP implementation (HMAC-Based One-Time Password Algorithm) as described in RFC 4226. The library relies on crypto-js (http://code.google.com/p/crypto-js/) for the javascript HMAC-SHA1 implementation.
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Alexandre Dulaunoy 772361c362 README.md added with a simple description
2014-01-12 20:07:34 +01:00
hotp added 7 and 8 decimals HOTP output 2009-12-18 22:02:09 +01:00
example-l.html a sample page with local javascript (especially for the BlackBerry browser...) 2009-12-14 11:16:54 +01:00
example.html added 7 and 8 decimals HOTP output 2009-12-18 22:02:09 +01:00
README.md README.md added with a simple description 2014-01-12 20:07:34 +01:00

README.md

hotp-js - A simple JavaScript HOTP implementation

A simple JavaScript HOTP implementation (HMAC-Based One-Time Password Algorithm) as described in RFC4226. The library is relying on crypto-js for the javascript HMAC-SHA1 implementation.

How to use it

Load the htop.js, 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

Security recommendations

  • 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.

License

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/>.