AES-256 encryption in PHP

Question

I need a PHP function, AES256_encode($dataToEcrypt) to encrypt the $data into AES-256 and another one AES256_decode($encryptedData) do

Answer 1

MCRYPT_RIJNDAEL_256 is not equivalent to AES_256.

The way to make RIJNDAEL be decrypted from AES is to use MCRYPT_RIJNDAEL_128 and padd the string to encrypt before encrypting

AES-256 has BlockSize=128bit and KeySize=256bit Rijndael-256 has BlockSize=256bit and KeySize=256bit

Just AES/Rijndael 128bit are identical. Rijndael-192 and Rijndael-256 are not identical to AES-192 and AES-256 (block sizes and number of rounds differ).