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<?php

define('ENCRYPTION_KEY', 'EncryptDecryptPHP201908Y');

// Encrypt
function encrypt($plaintext) {
  $ivlen = openssl_cipher_iv_length($cipher = "AES-128-CBC");
  $iv = openssl_random_pseudo_bytes($ivlen);
  $ciphertext_raw = openssl_encrypt($plaintext, $cipher, ENCRYPTION_KEY, $options = OPENSSL_RAW_DATA, $iv);
  $hmac = hash_hmac('sha256', $ciphertext_raw, ENCRYPTION_KEY, $as_binary = true);