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<?php |
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namespace Magister\Services\Encryption; |
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use Magister\Services\Contracts\Encryption\DecryptException; |
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use Magister\Services\Contracts\Encryption\Encrypter as EncrypterContract; |
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/** |
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* Class Encrypter. |
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*/ |
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class Encrypter implements EncrypterContract |
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{ |
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/** |
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* The encryption key. |
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* |
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* @var string |
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*/ |
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protected $key; |
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/** |
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* The algorithm used for encryption. |
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* |
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* @var string |
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*/ |
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protected $cipher = 'AES-128-CBC'; |
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/** |
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* The mode used for encryption. |
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* |
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* @var string |
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*/ |
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protected $mode = 'cbc'; |
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/** |
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* The block size of the cipher. |
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* |
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* @var int |
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*/ |
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protected $block = 32; |
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/** |
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* Create a new encrypter instance. |
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* |
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* @param string $key |
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*/ |
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public function __construct($key) |
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{ |
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$this->key = $key; |
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} |
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/** |
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* Encrypt the given value. |
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* |
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* @param string $value |
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* |
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* @return string |
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*/ |
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public function encrypt($value) |
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{ |
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$iv = random_bytes(openssl_cipher_iv_length($this->cipher)); |
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$value = openssl_encrypt($value, $this->cipher, $this->key, 0, $iv); |
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$mac = $this->hash($iv = base64_encode($iv), $value); |
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return base64_encode(json_encode(compact('iv', 'value', 'mac'))); |
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} |
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/** |
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* Decrypt the given value. |
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* |
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* @param string $payload |
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* |
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* @return string |
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*/ |
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public function decrypt($payload) |
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{ |
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$payload = $this->getJsonPayload($payload); |
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$value = base64_decode($payload['value']); |
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$iv = base64_decode($payload['iv']); |
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$decryptedValue = openssl_decrypt($value, $this->cipher, $this->key, 0, $iv); |
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return unserialize($decryptedValue); |
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} |
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/** |
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* Generate a new key. |
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* |
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* @return string |
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*/ |
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public function generateKey() |
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{ |
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return random_bytes(16); |
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} |
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/** |
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* Get the JSON array from the given payload. |
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* |
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* @param string $payload |
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* |
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* @throws \Magister\Services\Contracts\Encryption\DecryptException |
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* |
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* @return array |
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*/ |
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protected function getJsonPayload($payload) |
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{ |
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$payload = json_decode(base64_decode($payload), true); |
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if (!$payload || $this->invalidPayload($payload)) { |
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throw new DecryptException('Invalid data.'); |
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} |
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if (!$this->validMac($payload)) { |
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throw new DecryptException('MAC is invalid.'); |
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} |
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return $payload; |
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} |
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/** |
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* Determine if the MAC for the given payload is valid. |
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* |
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* @param array $payload |
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* |
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* @return bool |
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*/ |
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protected function validMac(array $payload) |
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{ |
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return $payload['mac'] === $this->hash($payload['iv'], $payload['value']); |
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} |
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/** |
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* Create a MAC for the given value. |
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* |
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* @param string $iv |
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* @param string $value |
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* |
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* @return string |
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*/ |
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protected function hash($iv, $value) |
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{ |
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return hash_hmac('sha256', $iv.$value, $this->key); |
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} |
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/** |
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* Verify that the encryption payload is valid. |
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* |
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* @param array|mixed $data |
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* |
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* @return bool |
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*/ |
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protected function invalidPayload($data) |
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{ |
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return !is_array($data) || !isset($data['iv']) || !isset($data['value']) || !isset($data['mac']); |
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} |
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/** |
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* Set the encryption key. |
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* |
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* @param string $key |
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* |
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* @return void |
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*/ |
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public function setKey($key) |
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{ |
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$this->key = $key; |
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} |
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/** |
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* Set the encryption cipher. |
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* |
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* @param string $cipher |
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* |
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* @return void |
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*/ |
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public function setCipher($cipher) |
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{ |
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$this->cipher = $cipher; |
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} |
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/** |
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* Set the encryption mode. |
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* |
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* @param string $mode |
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* |
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* @return void |
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*/ |
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public function setMode($mode) |
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{ |
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$this->mode = $mode; |
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} |
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} |
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Stanvk /
Magister
