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* This is a PHP library that handles calling reCAPTCHA.
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* - Documentation and latest version
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* http://recaptcha.net/plugins/php/
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* - Get a reCAPTCHA API Key
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* http://recaptcha.net/api/getkey
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* http://groups.google.com/group/recaptcha
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* Copyright (c) 2007 reCAPTCHA -- http://recaptcha.net
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* The reCAPTCHA server URL's
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define("RECAPTCHA_API_SERVER", "http://api.recaptcha.net");
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define("RECAPTCHA_API_SECURE_SERVER", "https://api-secure.recaptcha.net");
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define("RECAPTCHA_VERIFY_SERVER", "api-verify.recaptcha.net");
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* Encodes the given data into a query string format
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* @param $data - array of string elements to be encoded
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* @return string - encoded request
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function _recaptcha_qsencode ($data) {
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foreach ( $data as $key => $value )
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$req .= $key . '=' . urlencode( stripslashes($value) ) . '&';
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$req=substr($req,0,strlen($req)-1);
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* Submits an HTTP POST to a reCAPTCHA server
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* @return array response
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function _recaptcha_http_post($host, $path, $data, $port = 80) {
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$req = _recaptcha_qsencode ($data);
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$http_request = "POST $path HTTP/1.0\r\n";
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$http_request .= "Host: $host\r\n";
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$http_request .= "Content-Type: application/x-www-form-urlencoded;\r\n";
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$http_request .= "Content-Length: " . strlen($req) . "\r\n";
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$http_request .= "User-Agent: reCAPTCHA/PHP\r\n";
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$http_request .= "\r\n";
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$http_request .= $req;
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if( false == ( $fs = @fsockopen($host, $port, $errno, $errstr, 10) ) ) {
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die ('Could not open socket');
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fwrite($fs, $http_request);
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$response .= fgets($fs, 1160); // One TCP-IP packet
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$response = explode("\r\n\r\n", $response, 2);
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* Gets the challenge HTML (javascript and non-javascript version).
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* This is called from the browser, and the resulting reCAPTCHA HTML widget
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* is embedded within the HTML form it was called from.
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* @param string $pubkey A public key for reCAPTCHA
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* @param string $error The error given by reCAPTCHA (optional, default is null)
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* @param boolean $use_ssl Should the request be made over ssl? (optional, default is false)
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* @return string - The HTML to be embedded in the user's form.
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function recaptcha_get_html ($pubkey, $error = null, $use_ssl = false)
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if ($pubkey == null || $pubkey == '') {
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die ("To use reCAPTCHA you must get an API key from <a href='http://recaptcha.net/api/getkey'>http://recaptcha.net/api/getkey</a>");
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$server = RECAPTCHA_API_SECURE_SERVER;
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$server = RECAPTCHA_API_SERVER;
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$errorpart = "&error=" . $error;
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return '<script type="text/javascript" src="'. $server . '/challenge?k=' . $pubkey . $errorpart . '"></script>
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<iframe src="'. $server . '/noscript?k=' . $pubkey . $errorpart . '" height="300" width="500" frameborder="0"></iframe><br>
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<textarea name="recaptcha_challenge_field" rows="3" cols="40"></textarea>
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<input type="hidden" name="recaptcha_response_field" value="manual_challenge">
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* A ReCaptchaResponse is returned from recaptcha_check_answer()
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class ReCaptchaResponse {
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* Calls an HTTP POST function to verify if the user's guess was correct
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* @param string $privkey
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* @param string $remoteip
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* @param string $challenge
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* @param string $response
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* @return ReCaptchaResponse
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function recaptcha_check_answer ($privkey, $remoteip, $challenge, $response)
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if ($privkey == null || $privkey == '') {
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die ("To use reCAPTCHA you must get an API key from <a href='http://recaptcha.net/api/getkey'>http://recaptcha.net/api/getkey</a>");
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if ($remoteip == null || $remoteip == '') {
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die ("For security reasons, you must pass the remote ip to reCAPTCHA");
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//discard spam submissions
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if ($challenge == null || strlen($challenge) == 0 || $response == null || strlen($response) == 0) {
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$recaptcha_response = new ReCaptchaResponse();
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$recaptcha_response->is_valid = false;
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$recaptcha_response->error = 'incorrect-captcha-sol';
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return $recaptcha_response;
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$response = _recaptcha_http_post (RECAPTCHA_VERIFY_SERVER, "/verify",
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'privatekey' => $privkey,
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'remoteip' => $remoteip,
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'challenge' => $challenge,
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'response' => $response
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$answers = explode ("\n", $response [1]);
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$recaptcha_response = new ReCaptchaResponse();
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if (trim ($answers [0]) == 'true') {
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$recaptcha_response->is_valid = true;
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$recaptcha_response->is_valid = false;
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$recaptcha_response->error = $answers [1];
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return $recaptcha_response;
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* gets a URL where the user can sign up for reCAPTCHA. If your application
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* has a configuration page where you enter a key, you should provide a link
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* using this function.
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* @param string $domain The domain where the page is hosted
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* @param string $appname The name of your application
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function recaptcha_get_signup_url ($domain = null, $appname = null) {
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return "http://recaptcha.net/api/getkey?" . _recaptcha_qsencode (array ('domain' => $domain, 'app' => $appname));
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function _recaptcha_aes_pad($val) {
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$numpad = $block_size - (strlen ($val) % $block_size);
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return str_pad($val, strlen ($val) + $numpad, chr($numpad));
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/* Mailhide related code */
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function _recaptcha_aes_encrypt($val,$ky) {
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if (! function_exists ("mcrypt_encrypt")) {
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die ("To use reCAPTCHA Mailhide, you need to have the mcrypt php module installed.");
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$mode=MCRYPT_MODE_CBC;
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$enc=MCRYPT_RIJNDAEL_128;
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$val=_recaptcha_aes_pad($val);
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return mcrypt_encrypt($enc, $ky, $val, $mode, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0");
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function _recaptcha_mailhide_urlbase64 ($x) {
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return strtr(base64_encode ($x), '+/', '-_');
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/* gets the reCAPTCHA Mailhide url for a given email, public key and private key */
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function recaptcha_mailhide_url($pubkey, $privkey, $email) {
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if ($pubkey == '' || $pubkey == null || $privkey == "" || $privkey == null) {
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die ("To use reCAPTCHA Mailhide, you have to sign up for a public and private key, " .
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"you can do so at <a href='http://mailhide.recaptcha.net/apikey'>http://mailhide.recaptcha.net/apikey</a>");
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$ky = pack('H*', $privkey);
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$cryptmail = _recaptcha_aes_encrypt ($email, $ky);
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return "http://mailhide.recaptcha.net/d?k=" . $pubkey . "&c=" . _recaptcha_mailhide_urlbase64 ($cryptmail);
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* gets the parts of the email to expose to the user.
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* eg, given johndoe@example,com return ["john", "example.com"].
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* the email is then displayed as john...@example.com
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function _recaptcha_mailhide_email_parts ($email) {
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$arr = preg_split("/@/", $email );
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if (strlen ($arr[0]) <= 4) {
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$arr[0] = substr ($arr[0], 0, 1);
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} else if (strlen ($arr[0]) <= 6) {
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$arr[0] = substr ($arr[0], 0, 3);
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$arr[0] = substr ($arr[0], 0, 4);
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* Gets html to display an email address given a public an private key.
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* to get a key, go to:
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* http://mailhide.recaptcha.net/apikey
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function recaptcha_mailhide_html($pubkey, $privkey, $email) {
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$emailparts = _recaptcha_mailhide_email_parts ($email);
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$url = recaptcha_mailhide_url ($pubkey, $privkey, $email);
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return htmlentities($emailparts[0]) . "<a href='" . htmlentities ($url) .
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"' onclick=\"window.open('" . htmlentities ($url) . "', '', 'toolbar=0,scrollbars=0,location=0,statusbar=0,menubar=0,resizable=0,width=500,height=300'); return false;\" title=\"Reveal this e-mail address\">...</a>@" . htmlentities ($emailparts [1]);
added
removed
html/inc/recaptchalib.php
