PHP インターフェースと ECharts を使用して統計グラフのデータ暗号化と復号化を実装する方法

function encrypt($plaintext, $encryption_key) {
  $cipher = "AES-128-CBC";
  $ivlen = openssl_cipher_iv_length($cipher);
  $iv = openssl_random_pseudo_bytes($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);
  return base64_encode( $iv.$hmac.$ciphertext_raw );
}

$encryption_key = "my_secret_key";
$plaintext = "sensitive_data";
$ciphertext = encrypt($plaintext, $encryption_key);

function decrypt($ciphertext, $encryption_key) {
  $c = base64_decode($ciphertext);
  $cipher = "AES-128-CBC";
  $ivlen = openssl_cipher_iv_length($cipher);
  $iv = substr($c, 0, $ivlen);
  $hmac = substr($c, $ivlen, $sha2len=32);
  $ciphertext_raw = substr($c, $ivlen+$sha2len);
  $calcmac = hash_hmac('sha256', $ciphertext_raw, $encryption_key, $as_binary=true);
  if (!hash_equals($hmac, $calcmac)) { return null; }
  $plaintext = openssl_decrypt($ciphertext_raw, $cipher, $encryption_key, $options=OPENSSL_RAW_DATA, $iv);
  return $plaintext;
}

$encryption_key = "my_secret_key";
$plaintext = decrypt($ciphertext, $encryption_key);

 array("A", "B", "C", "D", "E"),
  "values" => array(5, 20, 36, 10, 10)
);
echo json_encode($data);
?>