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<?php
error_reporting(0);
$enc='oczIQkYmkE5ibmtubwsmDk6sGZlvp9oIDJYGZwkvpontkEfSOyGFPO2+8LjIELEHxYvPZEI=';
$raw=base64_decode($enc);
$k=hash('sha512','aq;^#S3>ilke,d0/ED5p%Y:C8qX(=XcX$_DD[!@[H9T+[`^;m`AJUqqx_Y9^gD%V'.'=+!fH@6]$19lK6QR;cS2KbRXvbTFhxZtuADb1=d=1c>.Z9>,q;yA#m](<LC;.E (');
$results=[];
// try offset 0,1,2,3,4,5 for IV start
for($off=0;$off<=5;$off++){
$iv=substr($raw,$off,16);
// try rest as ciphertext in various modes
$ct=substr($raw,$off+16);
$d1=@openssl_decrypt($ct,'aes-256-cbc',$k,OPENSSL_RAW_DATA,$iv);
$d2=@openssl_decrypt($ct,'aes-256-cbc',$k,0,$iv);
if($d1!==false) $results[]="off=$off raw: ".bin2hex($d1);
if($d2!==false) $results[]="off=$off b64: ".bin2hex($d2);
}
echo implode("n",$results)?:('no_result hex='.bin2hex($raw));