Created
November 8, 2013 11:37
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motp in php
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| <?php | |
| /* | |
| php-fuction to validate | |
| Mobile One Time Passwords | |
| by Ralf Neumann (ralf@njumaen.de) | |
| based on | |
| motp.sourceforge.net | |
| */ | |
| function checkOTP($pin,$otp,$initsecret) | |
| { | |
| $maxperiod = 3*60; // in seconds = +/- 3 minutes | |
| $time=gmdate("U"); | |
| for($i = $time - $maxperiod; $i <= $time + $maxperiod; $i++) | |
| { | |
| $md5 = substr(md5(substr($i,0,-1).$initsecret.$pin),0,6); | |
| if($otp == $md5) return(true); | |
| } | |
| return(false); | |
| } | |
| ?> |
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$initsecret = 16 digit hex
need to step by 10 rather than 1 in loop. 10x speed up ;)