From c655b16f7529a9d3ceee5224cdaaed72443f7996 Mon Sep 17 00:00:00 2001
From: terrafrost <terrafrost@php.net>
Date: Tue, 1 Dec 2015 19:30:49 -0600
Subject: [PATCH] BigInteger: add engine to __debugInfo output and add unit
 test

---
 phpseclib/Math/BigInteger.php           | 23 ++++++++++++++++++++++-
 tests/Unit/Math/BigInteger/TestCase.php | 11 +++++++++++
 2 files changed, 33 insertions(+), 1 deletion(-)

diff --git a/phpseclib/Math/BigInteger.php b/phpseclib/Math/BigInteger.php
index 4ba64240..98ec4a93 100644
--- a/phpseclib/Math/BigInteger.php
+++ b/phpseclib/Math/BigInteger.php
@@ -820,7 +820,28 @@ class Math_BigInteger
      */
     function __debugInfo()
     {
-        return array('value' => '0x' . $this->toHex(true));
+        $opts = array();
+        switch (MATH_BIGINTEGER_MODE) {
+            case MATH_BIGINTEGER_MODE_GMP:
+                $engine = 'gmp';
+                break;
+            case MATH_BIGINTEGER_MODE_BCMATH:
+                $engine = 'bcmath';
+                break;
+            case MATH_BIGINTEGER_MODE_INTERNAL:
+                $engine = 'internal';
+                $opts[] = PHP_INT_SIZE == 8 ? '64-bit' : '32-bit';
+        }
+        if (MATH_BIGINTEGER_MODE != MATH_BIGINTEGER_MODE_GMP && defined('MATH_BIGINTEGER_OPENSSL_ENABLED')) {
+            $opts[] = 'OpenSSL';
+        }
+        if (!empty($opts)) {
+            $engine.= ' (' . implode($opts, ', ') . ')';
+        }
+        return array(
+            'value' => '0x' . $this->toHex(true),
+            'engine' => $engine
+        );
     }
 
     /**
diff --git a/tests/Unit/Math/BigInteger/TestCase.php b/tests/Unit/Math/BigInteger/TestCase.php
index 10eacc66..827b2b90 100644
--- a/tests/Unit/Math/BigInteger/TestCase.php
+++ b/tests/Unit/Math/BigInteger/TestCase.php
@@ -358,4 +358,15 @@ abstract class Unit_Math_BigInteger_TestCase extends PhpseclibTestCase
             'Failed asserting that Alice and Bob share the same BigInteger.'
         );
     }
+
+    /**
+     * @requires PHP 5.6
+     */
+    public function testDebugInfo()
+    {
+        $num = new Math_BigInteger(50);
+        $str = print_r($num, true);
+        $this->assertContains('[value] => 0x32', $str);
+        return $str;
+    }
 }