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<?php
/*
creating cipher object using Rijndael encyrption algorithm with Cipher-block chaining (CBC) as mode of AES encryption
Here I have chosen 128 bit Rijndael encyrption
*/
$cipher = mcrypt_module_open(MCRYPT_RIJNDAEL_128, '', MCRYPT_MODE_CBC, '');
 
/*
for 256 bit AES encryption key size should be of 32 bytes (256 bits)
for 128 bit AES encryption key size should be of 16 bytes (128 bits)
here i am doing 256-bit AES encryption
choose a strong key
*/
$key256 = '12345678901234561234567890123456';
 
/*
for 128 bit Rijndael encryption, initialization vector (iv) size should be 16 bytes
for 256 bit Rijndael encryption, initialization vector (iv) size should be 32 bytes
here I have chosen 128 bit Rijndael encyrption, so $iv size is 16 bytes
*/
$iv = '1234567890123456';
 
$plainText = 'This is plain text.';
mcrypt_generic_init($cipher, $key256, $iv);
// PHP pads with NULL bytes if $plainText is not a multiple of the block size
$cipherText256 = mcrypt_generic($cipher,$plainText );
mcrypt_generic_deinit($cipher);
/*
$cipherHexText256 stores encrypted text in hex
we will be decrypting data stored in $cipherHexText256 from node js
*/
$cipherHexText256 =bin2hex($cipherText256);
 
/*
echoing $cipherHexText256 (copy the output)
*/
echo $cipherHexText256;
?>

//require cyrpto module
var crypto=require('crypto');
 
//key and iv should be same as the one in encrypt.php
var decipher=crypto.createDecipheriv('aes-256-cbc','12345678901234561234567890123456','1234567890123456');
 
//since we have already added padding while encrypting, we will set autopadding of node js to false.
decipher.setAutoPadding(false);
 
// copy the output of encrypt.php and paste it below
var cipherHexText256="a3c0d0b8a72c98f97dad01f0c0008c31ef9398e820ce520368ae2b24be844c78";
 
var dec = decipher.update(cipherHexText256,'hex','utf8');
 
//decrypted data is stored in dec
dec += decipher.final('utf8');
 
console.log(dec);