Lithe Crypt

Lithe Crypt is a simple encryption and decryption utility for PHP, designed to work with the Lithe framework. It utilizes the AES-256-CBC algorithm for secure data handling.

Installation

To install the Lithe Crypt package, you can use Composer. If you haven't already, make sure you have Composer installed. Then run the following command in your project directory:

composer require lithemod/crypt

Requirements

• PHP 8 or higher
• OpenSSL extension enabled in your PHP installation

Usage

Loading Environment Variables

Before using the Crypt class, you need to load your environment variables. Use the following code to load your .env file:

use Lithe\Support\Env;

// Load environment variables
Env::load(__DIR__); // Adjust the path as necessary

Setting the APP_KEY

Ensure that the APP_KEY environment variable is set. This key should be a base64 encoded string of 32 bytes. You can configure it in your .env file or directly in your server environment.

Example of a valid base64 key:

YXNkZmFnc2Rhc2RmYWdlcyBhc2RmYWdlcyBhYXNkZmFnc2Q=

Encrypting Data

To encrypt data, use the encrypt method of the Crypt class. You can also specify whether you want to use a fixed IV (initialization vector) for encryption:

use Lithe\Support\Security\Crypt;

$data = "sensitive data";

// Encrypt without fixed IV
$encrypted = Crypt::encrypt($data);
echo "Encrypted Data: " . $encrypted;

// Encrypt with fixed IV (useful for unique values like emails)
$encryptedWithSameIV = Crypt::encrypt($data, true);
echo "Encrypted Data with Fixed IV: " . $encryptedWithSameIV;

Decrypting Data

To decrypt the previously encrypted data, use the decrypt method. You must specify the same parameters used during encryption to ensure proper decryption:

use Lithe\Support\Security\Crypt;

// Decrypt without fixed IV
$decrypted = Crypt::decrypt($encrypted);
echo "Decrypted Data: " . $decrypted;

// Decrypt with fixed IV
$decryptedWithSameIV = Crypt::decrypt($encryptedWithSameIV, true, $data);
echo "Decrypted Data with Fixed IV: " . $decryptedWithSameIV;

Exception Handling

If the APP_KEY is not set or is invalid, the Crypt class will throw a CryptException. It's essential to handle this exception in your code to avoid unexpected errors:

use Lithe\Exceptions\Encryption\CryptException;

try {
    $encrypted = Crypt::encrypt($data);
    // Decrypt without fixed IV
    $decrypted = Crypt::decrypt($encrypted);
} catch (CryptException $e) {
    echo "Encryption Error: " . $e->getMessage();
}

Unit Tests

To ensure the functionality of the Crypt class, unit tests are provided. You can run the tests using PHPUnit:

./vendor/bin/phpunit

Test Cases

• testEncryptDecrypt: Tests the encryption and decryption process.
• testEncryptWithNullData: Tests encryption with null data.
• testEncryptWithSameIV: Tests the behavior of encryption with a fixed IV.

Contributing

If you would like to contribute to the Lithe Crypt project, please follow these guidelines:

1. Fork the repository.
2. Create a new branch for your feature or bug fix.
3. Write tests for your changes.
4. Submit a pull request with a clear description of your changes.

License

This project is licensed under the MIT License.