Simple PHP encrypt and decrypt using OpenSSL

openssl_encrypt_decrypt.php

<?php
/**
 * simple method to encrypt or decrypt a plain text string
 * initialization vector(IV) has to be the same when encrypting and decrypting
 * 
 * @param string $action: can be 'encrypt' or 'decrypt'
 * @param string $string: string to encrypt or decrypt
 *
 * @return string
 */
function encrypt_decrypt($action, $string) {
    $output = false;

    $encrypt_method = "AES-256-CBC";
    $secret_key = 'This is my secret key';
    $secret_iv = 'This is my secret iv';

    // hash
    $key = hash('sha256', $secret_key);
    
    // iv - encrypt method AES-256-CBC expects 16 bytes - else you will get a warning
    $iv = substr(hash('sha256', $secret_iv), 0, 16);

    if ( $action == 'encrypt' ) {
        $output = openssl_encrypt($string, $encrypt_method, $key, 0, $iv);
        $output = base64_encode($output);
    } else if( $action == 'decrypt' ) {
        $output = openssl_decrypt(base64_decode($string), $encrypt_method, $key, 0, $iv);
    }

    return $output;
}

$plain_txt = "This is my plain text";
echo "Plain Text =" .$plain_txt. "\n";

$encrypted_txt = encrypt_decrypt('encrypt', $plain_txt);
echo "Encrypted Text = " .$encrypted_txt. "\n";

$decrypted_txt = encrypt_decrypt('decrypt', $encrypted_txt);
echo "Decrypted Text =" .$decrypted_txt. "\n";

if ( $plain_txt === $decrypted_txt ) echo "SUCCESS";
else echo "FAILED";

echo "\n";

?>

How can I decrypt this in java ?

Thank you so much, but I have some questions :

1. Is it safe to use that code in my website when every one know it?
2. What's the maximum length of the $secret_key and the $secret_iv?
3. What's the best way to hide that code from everyone?

-Adel Sbeh

How to add cs5 padding with the encryption?? please, I need to know urgently.

great code, thanks a lot

Hello thanks for the code, works well, and works with short text strings but how I can encrypt text longer?

Hello from 2021,
Helped me ;)

Helped me 👍

How can I decrypt this in java ?

simple, you must move to php. haha. just kidding

Does it work for large amounts of text?