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<?php |
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/** |
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* PhPsst. |
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* |
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* @copyright Copyright (c) 2016 Felix Sandström |
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* @license MIT |
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*/ |
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namespace PhPsst; |
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use Illuminate\Encryption\Encrypter; |
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use PhPsst\Storage\Storage; |
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/** |
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* A PHP library for distributing (one time) passwords/secrets in a more secure way. |
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* |
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* @author Felix Sandström <http://github.com/felixsand> |
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*/ |
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class PhPsst |
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{ |
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/** |
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* @var Storage |
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*/ |
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protected $storage; |
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/** |
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* @var string |
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*/ |
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protected $cipher; |
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/** |
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* @const string |
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*/ |
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const CIPHER_DEFAULT = 'AES-256-CBC'; |
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/** |
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* PhPsst constructor. |
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* @param Storage $storage |
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* @param string $cipher |
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*/ |
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public function __construct(Storage $storage, $cipher = null) |
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{ |
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$this->storage = $storage; |
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if ($cipher !== null) { |
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$this->cipher = $cipher; |
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} else { |
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$this->cipher = self::CIPHER_DEFAULT; |
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} |
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} |
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/** |
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* @param string $password |
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* @param int $ttl |
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* @param int $views |
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* @return string |
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*/ |
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public function store($password, $ttl = 3600, $views = 1) |
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{ |
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if (empty($password)) { |
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throw new \InvalidArgumentException('The password has to be set'); |
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} |
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$ttl = (int) $ttl; |
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if ($ttl < 1) { |
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throw new \InvalidArgumentException('TTL has to be higher than 0'); |
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} |
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$views = (int) $views; |
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if ($views < 1) { |
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throw new \InvalidArgumentException('Views has to be highter han 0'); |
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} |
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$id = uniqid(); |
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$key = $this->generateKey(); |
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$encrypter = new Encrypter($key, $this->cipher); |
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$this->storage->store(new Password($id, $encrypter->encrypt($password), $ttl, $views)); |
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return $id . ';' . $key; |
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} |
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/** |
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* @param $secret |
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* @return string |
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*/ |
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public function retrieve($secret) |
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{ |
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if (!($idKeyArray = explode(';', $secret)) || count($idKeyArray) != 2) { |
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throw new \InvalidArgumentException('Invalid secret'); |
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} |
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list($id, $key) = $idKeyArray; |
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$id = preg_replace("/[^a-zA-Z\d]/", '', $id); |
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if (!($password = $this->storage->get($id))) { |
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throw new PhPsstException('No password with that ID found', PhPsstException::NO_PASSWORD_WITH_ID_FOUND); |
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} |
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$encrypter = new Encrypter($key, $this->cipher); |
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$password->decreaseViews(); |
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if ($password->getViews() > 0) { |
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$this->storage->store($password, true); |
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} else { |
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$this->storage->delete($password); |
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} |
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return $encrypter->decrypt($password->getPassword()); |
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} |
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/** |
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* @return string |
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*/ |
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protected function generateKey() |
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{ |
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$key = null; |
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switch ($this->cipher) { |
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case 'AES-128-CBC': |
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$key = bin2hex(random_bytes(8)); |
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break; |
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case 'AES-256-CBC': |
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$key = bin2hex(random_bytes(16)); |
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break; |
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default: |
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throw new \RuntimeException('Only supported ciphers are AES-128-CBC and AES-256-CBC'); |
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} |
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return $key; |
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} |
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} |
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felixsand /
PhPsst
This check looks for variable assignements that are either overwritten by other assignments or where the variable is not used subsequently.
Both the
$myVarassignment in line 1 and the$higherassignment in line 2 are dead. The first because$myVaris never used and the second because$higheris always overwritten for every possible time line.