<?php
namespace Illuminate\Encryption;
use Illuminate\Contracts\Encryption\DecryptException;
use Illuminate\Contracts\Encryption\Encrypter as EncrypterContract;
use Illuminate\Contracts\Encryption\EncryptException;
use Illuminate\Contracts\Encryption\StringEncrypter;
use RuntimeException;
class Encrypter implements EncrypterContract, StringEncrypter
{
/**
* The encryption key.
*
* @var string
*/
protected $key;
/**
* The algorithm used for encryption.
*
* @var string
*/
protected $cipher;
/**
* The supported cipher algorithms and their properties.
*
* @var array
*/
private static $supportedCiphers = [
'aes-128-cbc' => ['size' => 16, 'aead' => false],
'aes-256-cbc' => ['size' => 32, 'aead' => false],
'aes-128-gcm' => ['size' => 16, 'aead' => true],
'aes-256-gcm' => ['size' => 32, 'aead' => true],
];
/**
* Create a new encrypter instance.
*
* @param string $key
* @param string $cipher
* @return void
*
* @throws \RuntimeException
*/
public function __construct($key, $cipher = 'aes-128-cbc')
{
$key = (string) $key;
if (! static::supported($key, $cipher)) {
$ciphers = implode(', ', array_keys(self::$supportedCiphers));
throw new RuntimeException("Unsupported cipher or incorrect key length. Supported ciphers are: {$ciphers}.");
}
$this->key = $key;
$this->cipher = $cipher;
}
/**
* Determine if the given key and cipher combination is valid.
*
* @param string $key
* @param string $cipher
* @return bool
*/
public static function supported($key, $cipher)
{
if (! isset(self::$supportedCiphers[strtolower($cipher)])) {
return false;
}
return mb_strlen($key, '8bit') === self::$supportedCiphers[strtolower($cipher)]['size'];
}
/**
* Create a new encryption key for the given cipher.
*
* @param string $cipher
* @return string
*/
public static function generateKey($cipher)
{
return random_bytes(self::$supportedCiphers[strtolower($cipher)]['size'] ?? 32);
}
/**
* Encrypt the given value.
*
* @param mixed $value
* @param bool $serialize
* @return string
*
* @throws \Illuminate\Contracts\Encryption\EncryptException
*/
public function encrypt($value, $serialize = true)
{
$iv = random_bytes(openssl_cipher_iv_length(strtolower($this->cipher)));
$value = \openssl_encrypt(
$serialize ? serialize($value) : $value,
strtolower($this->cipher), $this->key, 0, $iv, $tag
);
if ($value === false) {
throw new EncryptException('Could not encrypt the data.');
}
$iv = base64_encode($iv);
$tag = base64_encode($tag ?? '');
$mac = self::$supportedCiphers[strtolower($this->cipher)]['aead']
? '' // For AEAD-algorithms, the tag / MAC is returned by openssl_encrypt...
: $this->hash($iv, $value);
$json = json_encode(compact('iv', 'value', 'mac', 'tag'), JSON_UNESCAPED_SLASHES);
if (json_last_error() !== JSON_ERROR_NONE) {
throw new EncryptException('Could not encrypt the data.');
}
return base64_encode($json);
}
/**
* Encrypt a string without serialization.
*
* @param string $value
* @return string
*
* @throws \Illuminate\Contracts\Encryption\EncryptException
*/
public function encryptString($value)
{
return $this->encrypt($value, false);
}
/**
* Decrypt the given value.
*
* @param string $payload
* @param bool $unserialize
* @return mixed
*
* @throws \Illuminate\Contracts\Encryption\DecryptException
*/
public function decrypt($payload, $unserialize = true)
{
$payload = $this->getJsonPayload($payload);
$iv = base64_decode($payload['iv']);
$this->ensureTagIsValid(
$tag = empty($payload['tag']) ? null : base64_decode($payload['tag'])
);
// Here we will decrypt the value. If we are able to successfully decrypt it
// we will then unserialize it and return it out to the caller. If we are
// unable to decrypt this value we will throw out an exception message.
$decrypted = \openssl_decrypt(
$payload['value'], strtolower($this->cipher), $this->key, 0, $iv, $tag ?? ''
);
if ($decrypted === false) {
throw new DecryptException('Could not decrypt the data.');
}
return $unserialize ? unserialize($decrypted) : $decrypted;
}
/**
* Decrypt the given string without unserialization.
*
* @param string $payload
* @return string
*
* @throws \Illuminate\Contracts\Encryption\DecryptException
*/
public function decryptString($payload)
{
return $this->decrypt($payload, false);
}
/**
* Create a MAC for the given value.
*
* @param string $iv
* @param mixed $value
* @return string
*/
protected function hash($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 (! $this->validPayload($payload)) {
throw new DecryptException('The payload is invalid.');
}
if (! self::$supportedCiphers[strtolower($this->cipher)]['aead'] && ! $this->validMac($payload)) {
throw new DecryptException('The MAC is invalid.');
}
return $payload;
}
/**
* Verify that the encryption payload is valid.
*
* @param mixed $payload
* @return bool
*/
protected function validPayload($payload)
{
if (! is_array($payload)) {
return false;
}
foreach (['iv', 'value', 'mac'] as $item) {
if (! isset($payload[$item]) || ! is_string($payload[$item])) {
return false;
}
}
if (isset($payload['tag']) && ! is_string($payload['tag'])) {
return false;
}
return strlen(base64_decode($payload['iv'], true)) === openssl_cipher_iv_length(strtolower($this->cipher));
}
/**
* Determine if the MAC for the given payload is valid.
*
* @param array $payload
* @return bool
*/
protected function validMac(array $payload)
{
return hash_equals(
$this->hash($payload['iv'], $payload['value']), $payload['mac']
);
}
/**
* Ensure the given tag is a valid tag given the selected cipher.
*
* @param string $tag
* @return void
*/
protected function ensureTagIsValid($tag)
{
if (self::$supportedCiphers[strtolower($this->cipher)]['aead'] && strlen($tag) !== 16) {
throw new DecryptException('Could not decrypt the data.');
}
if (! self::$supportedCiphers[strtolower($this->cipher)]['aead'] && is_string($tag)) {
throw new DecryptException('Unable to use tag because the cipher algorithm does not support AEAD.');
}
}
/**
* Get the encryption key that the encrypter is currently using.
*
* @return string
*/
public function getKey()
{
return $this->key;
}
}
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