note 110288 added to function.hash-hmac

A function implementing the algorithm outlined in RFC 6238 (http://tools.ietf.org/html/rfc6238) <?php /** * This function implements the algorithm outlined * in RFC 6238 for Time-Based One-Time Passwords * * @link http://tools.ietf.org/html/rfc6238 * @param string $key the string to use for the HMAC key * @param mixed $time a value that reflects a time (unix * time in the example) * @param int $digits the desired length of the OTP * @param string $crypto the desired HMAC crypto algorithm * @return string the generated OTP */ function oauth_totp($key, $time, $digits=8, $crypto='sha256') { $digits = intval($digits); $result = null; // Convert counter to binary (64-bit) $data = pack('NNC*', $time >> 32, $time & 0xFFFFFFFF); // Pad to 8 chars (if necessary) if (strlen ($data) < 8) { $data = str_pad($data, 8, chr(0), STR_PAD_LEFT); } // Get the hash $hash = hash_hmac($crypto, $data, $key); // Grab the offset $offset = 2 * hexdec(substr($hash, strlen($hash) - 1, 1)); // Grab the portion we're interested in $binary = hexdec(substr($hash, $offset, 8)) & 0x7fffffff; // Modulus $result = $binary % pow(10, $digits); // Pad (if necessary) $result = str_pad($result, $digits, "0", STR_PAD_LEFT); return $result; } ?> ---- Server IP: 94.76.225.145 Probable Submitter: 188.92.232.203 ---- Manual Page -- http://www.php.net/manual/en/function.hash-hmac.php Edit -- https://master.php.net/note/edit/110288 Del: integrated -- https://master.php.net/note/delete/110288/integrated Del: useless -- https://master.php.net/note/delete/110288/useless Del: bad code -- https://master.php.net/note/delete/110288/bad+code Del: spam -- https://master.php.net/note/delete/110288/spam Del: non-english -- https://master.php.net/note/delete/110288/non-english Del: in docs -- https://master.php.net/note/delete/110288/in+docs Del: other reasons-- https://master.php.net/note/delete/110288 Reject -- https://master.php.net/note/reject/110288 Search -- https://master.php.net/manage/user-notes.php