Viel neues

qa-tool/htdocs/oidc/phpseclib/Math/BigInteger/Engines/BCMath/BuiltIn.php

@@ -0,0 +1,37 @@
+<?php
+
+/**
+ * Built-In BCMath Modular Exponentiation Engine
+ *
+ * PHP version 5 and 7
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2017 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://pear.php.net/package/Math_BigInteger
+ */
+
+declare(strict_types=1);
+
+namespace phpseclib3\Math\BigInteger\Engines\BCMath;
+
+use phpseclib3\Math\BigInteger\Engines\BCMath;
+
+/**
+ * Built-In BCMath Modular Exponentiation Engine
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class BuiltIn extends BCMath
+{
+    /**
+     * Performs modular exponentiation.
+     */
+    protected static function powModHelper(BCMath $x, BCMath $e, BCMath $n): BCMath
+    {
+        $temp = new BCMath();
+        $temp->value = bcpowmod($x->value, $e->value, $n->value);
+
+        return $x->normalize($temp);
+    }
+}