Why AES Decrypt code doesn't work in php 7.2 - php

Question

I used AES for encrypt the post parameters that send from java to server with volley. so I used below's class in my server for decrypt the post parammeters .
<?php
class MCrypt {
private $hex_iv = '31323334353637383930616263646566'; # converted Java byte code in to HEX and placed it here
private $key = '0FDOUZ.Qz'; #Same as in JAVA
function __construct() {
$this->key = hash('sha256', $this->key, true);
//echo $this->key.'<br/>';
}
function encrypt($str) {
$td = mcrypt_module_open(MCRYPT_RIJNDAEL_128, '', MCRYPT_MODE_CBC, '');
mcrypt_generic_init($td, $this->key, $this->hexToStr($this->hex_iv));
$block = mcrypt_get_block_size(MCRYPT_RIJNDAEL_128, MCRYPT_MODE_CBC);
$pad = $block - (strlen($str) % $block);
$str .= str_repeat(chr($pad), $pad);
$encrypted = mcrypt_generic($td, $str);
mcrypt_generic_deinit($td);
mcrypt_module_close($td);
return base64_encode($encrypted);
}
function decrypt($code) {
$td = mcrypt_module_open(MCRYPT_RIJNDAEL_128, '', MCRYPT_MODE_CBC, '');
mcrypt_generic_init($td, $this->key, $this->hexToStr($this->hex_iv));
$str = mdecrypt_generic($td, base64_decode($code));
$block = mcrypt_get_block_size(MCRYPT_RIJNDAEL_128, MCRYPT_MODE_CBC);
mcrypt_generic_deinit($td);
mcrypt_module_close($td);
return $this->strippadding($str);
}
/*
For PKCS7 padding
*/
private function addpadding($string, $blocksize = 16) {
$len = strlen($string);
$pad = $blocksize - ($len % $blocksize);
$string .= str_repeat(chr($pad), $pad);
return $string;
}
private function strippadding($string) {
$slast = ord(substr($string, -1));
$slastc = chr($slast);
$pcheck = substr($string, -$slast);
if (preg_match("/$slastc{" . $slast . "}/", $string)) {
$string = substr($string, 0, strlen($string) - $slast);
return $string;
} else {
return false;
}
}
function hexToStr($hex)
{
$string='';
for ($i=0; $i < strlen($hex)-1; $i+=2)
{
$string .= chr(hexdec($hex[$i].$hex[$i+1]));
}
return $string;
}
}
?>
Also I used below's code in newuser.php file .
<?php
.....
//decrypt
$encryption = new MCrypt();
$phone= $encryption->decrypt($phoneenc);
$password= $encryption->decrypt($passwordenc);
$serialdivice= $encryption->decrypt($serialdiviceenc);
$sequretyQustion= $encryption->decrypt($sequretyQustionenc);
$sequretyAnsewr= $encryption->decrypt($sequretyAnsewrenc);
.... ?>
Before Update php to php7.2 my code worked correctly . But for now It get error for decrypt method when I updated php . so How can i fix it?

Answer 1

I used openssl for both java and php .It's working correctly now.