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diff --git a/vendor/OTPHP/HOTP.php b/vendor/OTPHP/HOTP.php
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+<?php
+/*
+ * Copyright (c) 2011 Le Lag 
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+namespace OTPHP {
+  /**
+   * HOTP - One time password generator 
+   * 
+   * The HOTP class allow for the generation 
+   * and verification of one-time password using 
+   * the HOTP specified algorithm.
+   *
+   * This class is meant to be compatible with 
+   * Google Authenticator
+   *
+   * This class was originally ported from the rotp
+   * ruby library available at https://github.com/mdp/rotp
+   */
+  class HOTP extends OTP {
+    /**
+     *  Get the password for a specific counter value
+     *  @param integer $count the counter which is used to
+     *  seed the hmac hash function.
+     *  @return integer the One Time Password
+     */
+    public function at($count) {
+      return $this->generateOTP($count);
+    }
+
+
+    /**
+     * Verify if a password is valid for a specific counter value
+     *
+     * @param integer $otp the one-time password 
+     * @param integer $counter the counter value
+     * @return  bool true if the counter is valid, false otherwise
+     */
+    public function verify($otp, $counter) {
+      return ($otp == $this->at($counter));
+    }
+
+    /**
+     * Returns the uri for a specific secret for hotp method.
+     * Can be encoded as a image for simple configuration in 
+     * Google Authenticator.
+     *
+     * @param string $name the name of the account / profile
+     * @param integer $initial_count the initial counter 
+     * @return string the uri for the hmac secret
+     */
+    public function provisioning_uri($name, $initial_count) {
+      return "otpauth://hotp/".urlencode($name)."?secret={$this->secret}&counter=$initial_count";
+    }
+  }
+
+}