feature/cierres (#25)

Varios cambios

Co-authored-by: Juan Pablo Vial <jpvialb@incoviba.cl>
Reviewed-on: http://git.provm.cl/Incoviba/oficial/pulls/25

app/src/Service/HMAC.php

@@ -0,0 +1,16 @@
+<?php
+namespace Incoviba\Service;
+
+use Incoviba\Common\Ideal;
+
+class HMAC extends Ideal\Service
+{
+    public function validate(string $timestamp, string $requestSignature, string $requestId, string $secret): bool
+    {
+        $message = "{$timestamp}.{$requestId}";
+        $encodedSecret = mb_convert_encoding($secret, 'UTF-8');
+        $encodedMessage = mb_convert_encoding($message, 'UTF-8');
+        $hmacObject = hash_hmac('sha256', $encodedMessage, $encodedSecret);
+        return hash_equals($hmacObject, $requestSignature);
+    }
+}