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<?php
namespace Illuminate\Encryption;
use Illuminate\Contracts\Encryption\DecryptException;
abstract class BaseEncrypter
{
/**
* The encryption key.
*
* @var string
*/
protected $key;
/**
* Create a MAC for the given value.
*
* @param string $iv
* @param string $value
* @return string
*/
protected function hash($iv, $value)
{
return hash_hmac('sha256', $iv.$value, $this->key);
}
/**
* Get the JSON array from the given payload.
*
* @param string $payload
* @return array
*
* @throws \Illuminate\Contracts\Encryption\DecryptException
*/
protected function getJsonPayload($payload)
{
$payload = json_decode(base64_decode($payload), true);
// If the payload is not valid JSON or does not have the proper keys set we will
// assume it is invalid and bail out of the routine since we will not be able
// to decrypt the given value. We'll also check the MAC for this encryption.
if (! $payload || $this->invalidPayload($payload)) {
throw new DecryptException('The payload is invalid.');
}
if (! $this->validMac($payload)) {
throw new DecryptException('The MAC is invalid.');
}
return $payload;
}
/**
* Verify that the encryption payload is valid.
*
* @param array|mixed $data
* @return bool
*/
protected function invalidPayload($data)
{
return ! is_array($data) || ! isset($data['iv']) || ! isset($data['value']) || ! isset($data['mac']);
}
/**
* Determine if the MAC for the given payload is valid.
*
* @param array $payload
* @return bool
*
* @throws \RuntimeException
*/
protected function validMac(array $payload)
{
$bytes = random_bytes(16);
$calcMac = hash_hmac('sha256', $this->hash($payload['iv'], $payload['value']), $bytes, true);
return hash_equals(hash_hmac('sha256', $payload['mac'], $bytes, true), $calcMac);
}
}