A simple two-way function to encrypt or decrypt a string

two-way-encrypt-decrypt.php

/**
 * Encrypt and decrypt
 * 
 * @author Nazmul Ahsan <n.mukto@gmail.com>
 * @link http://nazmulahsan.me/simple-two-way-function-encrypt-decrypt-string/
 *
 * @param string $string string to be encrypted/decrypted
 * @param string $action what to do with this? e for encrypt, d for decrypt
 */
function my_simple_crypt( $string, $action = 'e' ) {
    // you may change these values to your own
    $secret_key = 'my_simple_secret_key';
    $secret_iv = 'my_simple_secret_iv';

    $output = false;
    $encrypt_method = "AES-256-CBC";
    $key = hash( 'sha256', $secret_key );
    $iv = substr( hash( 'sha256', $secret_iv ), 0, 16 );

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

    return $output;
}
     
     
/*
     
# Example

```
$encrypted = my_simple_crypt( 'Hello World!', 'e' );
```
return value => RTlOMytOZStXdjdHbDZtamNDWFpGdz09

```
$decrypted = my_simple_crypt( 'RTlOMytOZStXdjdHbDZtamNDWFpGdz09', 'd' );
```
return value => Hello World!

*/

Is this function open source?

Is this function open source?

might be, but that not my code as header says :)

http://web.archive.org/web/20200513045600/https://nazmulahsan.me/simple-two-way-function-encrypt-decrypt-string/