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Last Updated: 2022-12-02 21:25:56
Use Ciphersweet in your Laravel project
License: MIT License
Languages: PHP
In your project, you might store sensitive personal data in your database. Should an unauthorised person get access to your DB, all sensitive can be read which is obviously not good.
To solve this problem, you can encrypt the personal data. This way, unauthorized persons cannot read it, but your application can still decrypt it when you need to display or work with the data.
CipherSweet is a backend library developed by Paragon Initiative Enterprises for implementing searchable field-level encryption. It can encrypt and decrypt values in a very secure way. It is also able to create blind indexes. These indexes can be used to perform searches on encrypted data. The indexes themselves are unreadable by humans.
Our package is a wrapper over CipherSweet, which allows you to easily use it with Laravel's Eloquent models.
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You can install the package via composer:
composer require spatie/laravel-ciphersweet
You must publish and run the migrations with:
php artisan vendor:publish --tag="ciphersweet-migrations"
php artisan migrate
Optionally, you can publish the config file with:
php artisan vendor:publish --tag="ciphersweet-config"
This is the contents of the config file:
return [
/*
* This controls which cryptographic backend will be used by CipherSweet.
* Unless you have specific compliance requirements, you should choose
* "nacl".
*
* Supported: "boring", "fips", "nacl"
*/
'backend' => env('CIPHERSWEET_BACKEND', 'nacl'),
/*
* Select which key provider your application will use. The default option
* is to read a string literal out of .env, but it's also possible to
* provide the key in a file or use random keys for testing.
*
* Supported: "file", "random", "string"
*/
'provider' => env('CIPHERSWEET_PROVIDER', 'string'),
/*
* Set provider-specific options here. "string" will read the key directly
* from your .env file. "file" will read the contents of the specified file
* to use as your key. "custom" points to a factory class that returns a
* provider from its `__invoke` method. Please see the docs for more details.
*/
'providers' => [
'file' => [
'path' => env('CIPHERSWEET_FILE_PATH'),
],
'string' => [
'key' => env('CIPHERSWEET_KEY'),
],
],
];
Few steps are involved to store encrypted values. Let's go through them.
Add the CipherSweetEncrypted
interface and UsesCipherSweet
trait to the model that you want to add encrypted fields to.
You'll need to implement the configureCipherSweet
method to configure CipherSweet.
use Spatie\LaravelCipherSweet\Contracts\CipherSweetEncrypted;
use Spatie\LaravelCipherSweet\Concerns\UsesCipherSweet;
use ParagonIE\CipherSweet\EncryptedRow;
use ParagonIE\CipherSweet\BlindIndex;
use Illuminate\Database\Eloquent\Model;
class User extends Model implements CipherSweetEncrypted
{
use UsesCipherSweet;
/**
* Encrypted Fields
*
* Each column that should be encrypted should be added below. Each column
* in the migration should be a `text` type to store the encrypted value.
*
* ```
* ->addField('column_name')
* ->addBooleanField('column_name')
* ->addIntegerField('column_name')
* ->addTextField('column_name')
* ```
*
* A JSON array can be encrypted as long as the key structure is defined in
* a field map. See the docs for details on defining field maps.
*
* ```
* ->addJsonField('column_name', $fieldMap)
* ```
*
* Each field that should be searchable using an exact match needs to be
* added as a blind index. Partial search is not supported. See the docs
* for details on bit sizes and how to use compound indexes.
*
* ```
* ->addBlindIndex('column_name', new BlindIndex('column_name_index'))
* ```
*
* @see https://github.com/spatie/laravel-ciphersweet
* @see https://ciphersweet.paragonie.com/
* @see https://ciphersweet.paragonie.com/php/blind-index-planning
* @see https://github.com/paragonie/ciphersweet/blob/master/src/EncryptedRow.php
*
* @param EncryptedRow $encryptedRow
*
* @return void
*/
public static function configureCipherSweet(EncryptedRow $encryptedRow): void
{
$encryptedRow
->addField('email')
->addBlindIndex('email', new BlindIndex('email_index'));
}
}
The example above will encrypt the email
field on the User
model. It also adds a blind index in the blind_indexes
table which allows you to search on it.
Check out the CipherSweet PHP docs for more information on what is possible.
An encryption key is used to encrypt your values. You can generate a new CipherSweet encrypting key using this command:
php artisan ciphersweet:generate-key
With this in place, you can run this command to encrypt all values:
php artisan ciphersweet:encrypt <your-model-class> <generated-key>
The command will update all the encrypted fields and blind indexes of the model.
If you have a lot of rows, this process can take a long time. The command is restartable: it can be re-run without needing to re-encrypt already rotated keys.
After the fields have been encrypted, you should add the generated CipherSweet key to your .env file.
CIPHERSWEET_KEY=<YOUR-KEY>
The key will be used by your application to read encrypted values.
Even though values are encrypted, you can still search them using a blind index. The blind indexes will have been built up when you ran the command to encrypt the model values.
This package provides a whereBlind
and orWhereBlind
scope to search on blind indexes.
The first parameter is the column, the second the index name you set up when calling ->addBlindIndex
, the third is the raw value, the package will automatically apply any transformations and hash the value to search on the blind index.
$user = User::whereBlind('email', 'email_index', '[email protected]');
Should you suspect that somebody got a hold of your encrypting key, you can re-encrypt the values. Simply generate another encrypting key, and run the php artisan ciphersweet:encrypt
command again.
php artisan ciphersweet:encrypt "App\User" <your-new-key>
This will update all the encrypted fields and blind indexes of the model. Once this is done, you can update your environment or config file to use the new key.
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