# Encryption

## Settings

You can add two fields to specify a specific key and salt for encryption:

```
NAN_DEFAULT_KEY=
NAN_DEFAULT_SALT=
```

If not set it will use the `APP_KEY` as key and change it a bit for a salt.

{% hint style="warning" %}
Changing the key and/or salt will make previously encrypted values unreadable for the decrypt function!!
{% endhint %}

Start of by importing the controller where you are using it

```php
use NaN\NanGeneralController\Controllers\EncryptionController;
```

## Encryption

A function for encrypting data for storage.

Example:

```php
$phone_number = '+31612345678';
$EncryptionController = new EncryptionController();
$encrypted = $EncryptionController->encrypt($phone_number);
```

Tip: Set the debug paramater to true to see what the validation fails on

```php
$ValidationController->validateEmail($email, true);

// invalid_mx_or_a_record
// invalid_domain
// invalid_pregmatch_validate
// invalid_filter_validate
```

## Descrypt

A way to decrypt the encrypted values. This only works on values encrypted with the same key and salt as you are trying to decrypt.

Example:

```php
$number_value = '9H92n....eExMQT0FUDZq=';
$ValidationController = new ValidationController();
$phone_number = $ValidationController->decrypt($number_value, true);    
```

## Dummy

Get a dummy example of the decrypted value for displaying purposes. It only shows the first 3 chars and adds a '●'-char for every other character in the string.

```php
$api_key = 'Hn929....MUDZqQT0eExF=';
$ValidationController = new ValidationController();
$api_key = $ValidationController->decrypt($api_key, true);    
$api_key_to_show = $ValidationController->getDummy($api_key, true);
```

## Contains dummy character

Function to check if a string contains dummy characters. This is so you can prevent the saving of a submitted dummy-ised value

```php
$submitted_value = 'jes●●●●●●●●●●●●●●●●●●●';
$EncryptionController = new EncryptionController();
if (!$EncryptionController->containsDummyCharacter($submitted_value)){
    // Do stuff
}
```

## Decrypt object values

Function to decrypt a encrypted object. For example when getting a entry from a database, you can decrypt the object at once

```php
$user = User::find(1);
$EncryptionController = new EncryptionController();
        $user = $EncryptionController->decryptObjectValues($user);
```


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