note 75577 added to function.sha1

Can somebody help me to find a function opposite to sha1? I have hash string created by sha1 function and now I want to change it into previous form. Is it possible? How can I do it? ---- Server IP: 87.124.64.96 Probable Submitter: 80.229.81.101 ---- Manual Page -- http://www.php.net/manual/en/function.sha1.php Edit -- https://master.php.net/note/edit/75577 Del: integrated -- https://master.php.net/note/delete/75577/integrated Del: useless -- https://master.php.net/note/delete/75577/useless Del: bad code -- https://master.php.net/note/delete/75577/bad+code Del: spam -- https://master.php.net/note/delete/75577/spam Del: non-english -- https://master.php.net/note/delete/75577/non-english Del: in docs -- https://master.php.net/note/delete/75577/in+docs Del: other reasons-- https://master.php.net/note/delete/75577 Reject -- https://master.php.net/note/reject/75577 Search -- https://master.php.net/manage/user-notes.php