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vendor/laravel/framework/src/Illuminate/Encryption/Encrypter.php

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+<?php
+
+namespace Illuminate\Encryption;
+
+use RuntimeException;
+use Illuminate\Contracts\Encryption\DecryptException;
+use Illuminate\Contracts\Encryption\EncryptException;
+use Illuminate\Contracts\Encryption\Encrypter as EncrypterContract;
+
+class Encrypter implements EncrypterContract
+{
+    /**
+     * The encryption key.
+     *
+     * @var string
+     */
+    protected $key;
+
+    /**
+     * The algorithm used for encryption.
+     *
+     * @var string
+     */
+    protected $cipher;
+
+    /**
+     * 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)) {
+            $this->key = $key;
+            $this->cipher = $cipher;
+        } else {
+            throw new RuntimeException('The only supported ciphers are AES-128-CBC and AES-256-CBC with the correct key lengths.');
+        }
+    }
+
+    /**
+     * Determine if the given key and cipher combination is valid.
+     *
+     * @param  string  $key
+     * @param  string  $cipher
+     * @return bool
+     */
+    public static function supported($key, $cipher)
+    {
+        $length = mb_strlen($key, '8bit');
+
+        return ($cipher === 'AES-128-CBC' && $length === 16) ||
+               ($cipher === 'AES-256-CBC' && $length === 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(16);
+
+        // First we will encrypt the value using OpenSSL. After this is encrypted we
+        // will proceed to calculating a MAC for the encrypted value so that this
+        // value can be verified later as not having been changed by the users.
+        $value = \openssl_encrypt(
+            $serialize ? serialize($value) : $value,
+            $this->cipher, $this->key, 0, $iv
+        );
+
+        if ($value === false) {
+            throw new EncryptException('Could not encrypt the data.');
+        }
+
+        // Once we have the encrypted value we will go ahead base64_encode the input
+        // vector and create the MAC for the encrypted value so we can verify its
+        // authenticity. Then, we'll JSON encode the data in a "payload" array.
+        $mac = $this->hash($iv = base64_encode($iv), $value);
+
+        $json = json_encode(compact('iv', 'value', 'mac'));
+
+        if (! is_string($json)) {
+            throw new EncryptException('Could not encrypt the data.');
+        }
+
+        return base64_encode($json);
+    }
+
+    /**
+     * Encrypt a string without serialization.
+     *
+     * @param  string  $value
+     * @return string
+     */
+    public function encryptString($value)
+    {
+        return $this->encrypt($value, false);
+    }
+
+    /**
+     * Decrypt the given value.
+     *
+     * @param  mixed  $payload
+     * @param  bool  $unserialize
+     * @return string
+     *
+     * @throws \Illuminate\Contracts\Encryption\DecryptException
+     */
+    public function decrypt($payload, $unserialize = true)
+    {
+        $payload = $this->getJsonPayload($payload);
+
+        $iv = base64_decode($payload['iv']);
+
+        // 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'], $this->cipher, $this->key, 0, $iv
+        );
+
+        if ($decrypted === false) {
+            throw new DecryptException('Could not decrypt the data.');
+        }
+
+        return $unserialize ? unserialize($decrypted) : $decrypted;
+    }
+
+    /**
+     * Decrypt the given string without unserialization.
+     *
+     * @param  string  $payload
+     * @return string
+     */
+    public function decryptString($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 (! $this->validMac($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)
+    {
+        return is_array($payload) && isset(
+            $payload['iv'], $payload['value'], $payload['mac']
+        );
+    }
+
+    /**
+     * Determine if the MAC for the given payload is valid.
+     *
+     * @param  array  $payload
+     * @return bool
+     */
+    protected function validMac(array $payload)
+    {
+        $calculated = $this->calculateMac($payload, $bytes = random_bytes(16));
+
+        return hash_equals(
+            hash_hmac('sha256', $payload['mac'], $bytes, true), $calculated
+        );
+    }
+
+    /**
+     * Calculate the hash of the given payload.
+     *
+     * @param  array  $payload
+     * @param  string  $bytes
+     * @return string
+     */
+    protected function calculateMac($payload, $bytes)
+    {
+        return hash_hmac(
+            'sha256', $this->hash($payload['iv'], $payload['value']), $bytes, true
+        );
+    }
+
+    /**
+     * Get the encryption key.
+     *
+     * @return string
+     */
+    public function getKey()
+    {
+        return $this->key;
+    }
+}

vendor/laravel/framework/src/Illuminate/Encryption/EncryptionServiceProvider.php

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+<?php
+
+namespace Illuminate\Encryption;
+
+use Illuminate\Support\Str;
+use Illuminate\Support\ServiceProvider;
+
+class EncryptionServiceProvider extends ServiceProvider
+{
+    /**
+     * Register the service provider.
+     *
+     * @return void
+     */
+    public function register()
+    {
+        $this->app->singleton('encrypter', function ($app) {
+            $config = $app->make('config')->get('app');
+
+            // If the key starts with "base64:", we will need to decode the key before handing
+            // it off to the encrypter. Keys may be base-64 encoded for presentation and we
+            // want to make sure to convert them back to the raw bytes before encrypting.
+            if (Str::startsWith($key = $config['key'], 'base64:')) {
+                $key = base64_decode(substr($key, 7));
+            }
+
+            return new Encrypter($key, $config['cipher']);
+        });
+    }
+}

vendor/laravel/framework/src/Illuminate/Encryption/composer.json

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+{
+    "name": "illuminate/encryption",
+    "description": "The Illuminate Encryption package.",
+    "license": "MIT",
+    "homepage": "https://laravel.com",
+    "support": {
+        "issues": "https://github.com/laravel/framework/issues",
+        "source": "https://github.com/laravel/framework"
+    },
+    "authors": [
+        {
+            "name": "Taylor Otwell",
+            "email": "taylor@laravel.com"
+        }
+    ],
+    "require": {
+        "php": ">=5.6.4",
+        "ext-mbstring": "*",
+        "ext-openssl": "*",
+        "illuminate/contracts": "5.4.*",
+        "illuminate/support": "5.4.*",
+        "paragonie/random_compat": "~1.4|~2.0"
+    },
+    "autoload": {
+        "psr-4": {
+            "Illuminate\\Encryption\\": ""
+        }
+    },
+    "extra": {
+        "branch-alias": {
+            "dev-master": "5.4-dev"
+        }
+    },
+    "config": {
+        "sort-packages": true
+    },
+    "minimum-stability": "dev"
+}