encrypt and decrypt with diacrits - php

Question

I have these code for encrypt and decrypt.
It works good for text (for example: "This is a text"), which is withnout diacritics (that means without : ěščřžýáíéúů).
But I need encrypt and decrypt text with this special letters (with : ěščřžýáíéúů).
Can somebody help me, please?
Thank so much for every answer and help.
Have a nice day. M.
define ("ENCRYPTION_KEY", "QaY7e4d1c");
$string= "This is a text"; // -> this work alright
//$string= "áýžřčšě"; I NEED THIS TEXT ENCRYPT AND DECRTYPT
echo $encrypted = encrypt($string, ENCRYPTION_KEY);
echo "<br />";
echo $decrypted = decrypt($encrypted, ENCRYPTION_KEY);
function encrypt ($pure_string,$encryption_key)
{
$iv_size = mcrypt_get_iv_size(MCRYPT_BLOWFISH,MCRYPT_MODE_ECB);
$iv = mcrypt_create_iv($iv_size,MCRYPT_RAND);
$encrypted_string = mcrypt_encrypt(MCRYPT_BLOWFISH,$encryption_key,utf8_encode($pure_string),MCRYPT_MODE_ECB,$iv);
return $encrypted_string;
}
function decrypt ($encrypted_string,$encryption_key)
{
$iv_size = mcrypt_get_iv_size(MCRYPT_BLOWFISH,MCRYPT_MODE_ECB);
$iv = mcrypt_create_iv($iv_size,MCRYPT_RAND);
$decrypted_string = mcrypt_decrypt(MCRYPT_BLOWFISH,$encryption_key,$encrypted_string,MCRYPT_MODE_ECB ,$iv);
return $decrypted_string;
}

Answer 1

You're calling utf8_encode in your encryption function, but not calling utf8_decode when you decrypt, so your functions as they stand don't complement each other.
I'd recommend removing the call to utf8_encode entirely. mcrypt_encrypt doesn't care what encoding your string uses, so whatever you pass in will be what you get back out. Your script works fine for me if I remove it:
$encrypted_string = mcrypt_encrypt(MCRYPT_BLOWFISH, $encryption_key, $pure_string, MCRYPT_MODE_ECB, $iv);
I'd also suggest reading this: https://paragonie.com/blog/2015/05/if-you-re-typing-word-mcrypt-into-your-code-you-re-doing-it-wrong