New native implementation of the

`RandomByteGeneratorInterface`

Author: Rican7

src/Robin/Ntlm/Crypt/Random/NativeRandomByteGenerator.php

@@ -0,0 +1,47 @@
+<?php
+/**
+ * Robin NTLM
+ *
+ * @copyright 2016 Robin Powered, Inc.
+ * @link https://robinpowered.com/
+ */
+
+namespace Robin\Ntlm\Crypt\Random;
+
+use Exception;
+use Robin\Ntlm\Crypt\Exception\CryptographicFailureException;
+
+/**
+ * A cryptographically secure random byte generator implemented using the native
+ * PHP CSPRNG functions.
+ *
+ * @link http://php.net/csprng
+ */
+class NativeRandomByteGenerator implements RandomByteGeneratorInterface
+{
+
+    /**
+     * Methods
+     */
+
+    /**
+     * {@inheritDoc}
+     */
+    public function generate($size)
+    {
+        try {
+            $generated = random_bytes($size);
+        } catch (Error $e) {
+            // PHP 7+ will throw an `Error`. Catch here to make sure that we don't accidentally catch a polyfilled
+            // `Error` from a polyfill library, such as https://github.com/paragonie/random_compat
+            throw $e;
+        } catch (Exception $e) {
+            throw CryptographicFailureException::forReasonCode(
+                CryptographicFailureException::CODE_FOR_RANDOM_DATA_GENERATION_FAILURE,
+                $e
+            );
+        }
+
+        return $generated;
+    }
+}