hotp-js - A simple JavaScript HOTP implementation ================================================= A simple JavaScript HOTP implementation (HMAC-Based One-Time Password Algorithm) as described in [RFC4226](http://tools.ietf.org/html/rfc4226). The library is relying on [crypto-js](http://code.google.com/p/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. ```javascript 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 . ```