encrypt decrypt php

function encrypt_decrypt($string, $action = 'encrypt')
{
    $encrypt_method = "AES-256-CBC";
    $secret_key = 'AA74CDCC2BBRT935136HH7B63C27'; // user define private key
    $secret_iv = '5fgf5HJ5g27'; // user define secret key
    $key = hash('sha256', $secret_key);
    $iv = substr(hash('sha256', $secret_iv), 0, 16); // sha256 is hash_hmac_algo
    if ($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;
}
 
echo "Your Encrypted password is = ". $pwd = encrypt_decrypt('spaceo', 'encrypt');
echo "Your Decrypted password is = ". encrypt_decrypt($pwd, 'decrypt');

<?php 
  
// Store a string into the variable which 
// need to be Encrypted 
$simple_string = "Welcome to GeeksforGeeks\n"; 
  
// Display the original string 
echo "Original String: " . $simple_string; 
  
// Store the cipher method 
$ciphering = "AES-128-CTR"; 
  
// Use OpenSSl Encryption method 
$iv_length = openssl_cipher_iv_length($ciphering); 
$options = 0; 
  
// Non-NULL Initialization Vector for encryption 
$encryption_iv = '1234567891011121'; 
  
// Store the encryption key 
$encryption_key = "GeeksforGeeks"; 
  
// Use openssl_encrypt() function to encrypt the data 
$encryption = openssl_encrypt($simple_string, $ciphering, 
            $encryption_key, $options, $encryption_iv); 
  
// Display the encrypted string 
echo "Encrypted String: " . $encryption . "\n"; 
  
// Non-NULL Initialization Vector for decryption 
$decryption_iv = '1234567891011121'; 
  
// Store the decryption key 
$decryption_key = "GeeksforGeeks"; 
  
// Use openssl_decrypt() function to decrypt the data 
$decryption=openssl_decrypt ($encryption, $ciphering,  
        $decryption_key, $options, $decryption_iv); 
  
// Display the decrypted string 
echo "Decrypted String: " . $decryption; 
  
?>