note 84223 added to function.hash-hmac

Generating OATH-compliant OTP (one time passwords) results in PHP: <?php $otp = oath_truncate (oath_hotp ($key, $counter), $length); function oath_hotp ($key, $counter) { // Counter $bin_counter = pack ('C*', $counter); // Pad to 8 chars if (strlen ($bin_counter) < 8) { $bin_counter = str_repeat (chr(0), 8 - strlen ($bin_counter)) . $bin_counter; } // HMAC $hash = hash_hmac ('sha1', $bin_counter, $key); return $hash; } function oath_truncate ($hash, $length = 6) { // The last byte is used as an offset $offset = hexdec (substr ($hash, 38)) & 0xf; // Extract the relevant part, and clear the first bit $hex_truncated = substr ($hash, $offset * 2, 8); $bin_truncated = decbin (hexdec ($hex_truncated)); $bin_truncated[0] = '0'; $dec_truncated = bindec ($bin_truncated); return substr ($dec_truncated, 0 - $length); } ?> ---- Server IP: 64.71.164.2 Probable Submitter: 140.247.241.185 ---- Manual Page -- http://www.php.net/manual/en/function.hash-hmac.php Edit -- https://master.php.net/note/edit/84223 Del: integrated -- https://master.php.net/note/delete/84223/integrated Del: useless -- https://master.php.net/note/delete/84223/useless Del: bad code -- https://master.php.net/note/delete/84223/bad+code Del: spam -- https://master.php.net/note/delete/84223/spam Del: non-english -- https://master.php.net/note/delete/84223/non-english Del: in docs -- https://master.php.net/note/delete/84223/in+docs Del: other reasons-- https://master.php.net/note/delete/84223 Reject -- https://master.php.net/note/reject/84223 Search -- https://master.php.net/manage/user-notes.php