From 69325956ce3a192b8ec8722ad0fae4e6f80e968c Mon Sep 17 00:00:00 2001
From: terrafrost <terrafrost@php.net>
Date: Wed, 26 Jul 2023 21:23:08 -0500
Subject: [PATCH 1/3] Tests: add test for garbage collected primefield

---
 tests/Unit/Math/PrimeFieldTest.php | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/tests/Unit/Math/PrimeFieldTest.php b/tests/Unit/Math/PrimeFieldTest.php
index 24ecfabd..5d003b01 100644
--- a/tests/Unit/Math/PrimeFieldTest.php
+++ b/tests/Unit/Math/PrimeFieldTest.php
@@ -20,4 +20,21 @@ class PrimeFieldTest extends PhpseclibTestCase
 
         echo $num2->squareRoot();
     }
+
+    /**
+     * @group github1929
+     */
+    public function testGarbageCollectedToBytes()
+    {
+        $blob = base64_decode('BFgsTFQeqKr0toyURbtT43INMDS7FTHjz3yn3MR1/Yv/pb2b9ZCYNQ/Tafe5hQpEJ4TpZOKfikP/hWZvFL8QCPgqbIGqw/KTfA==');
+        $public = "\0" . substr($blob, 0, 49);
+        $private = substr($blob, -24);
+
+        $point = \phpseclib3\Crypt\EC\Formats\Keys\PKCS1::extractPoint(
+            $public,
+            new \phpseclib3\Crypt\EC\Curves\secp192r1()
+        );
+
+        $point[0]->toBytes();
+    }
 }

From 25a06f00714b6a1a4dd9307beae2c3408171b84d Mon Sep 17 00:00:00 2001
From: terrafrost <terrafrost@php.net>
Date: Wed, 26 Jul 2023 21:34:39 -0500
Subject: [PATCH 2/3] Math/PrimeField: fix for when garbage collection has
 wiped data

---
 phpseclib/Math/PrimeField/Integer.php | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/phpseclib/Math/PrimeField/Integer.php b/phpseclib/Math/PrimeField/Integer.php
index 748f9a49..ddb04912 100644
--- a/phpseclib/Math/PrimeField/Integer.php
+++ b/phpseclib/Math/PrimeField/Integer.php
@@ -312,8 +312,11 @@ class Integer extends Base
      */
     public function toBytes()
     {
-        $length = static::$modulo[$this->instanceID]->getLengthInBytes();
-        return str_pad($this->value->toBytes(), $length, "\0", STR_PAD_LEFT);
+        if (isset(static::$modulo[$this->instanceID])) {
+            $length = static::$modulo[$this->instanceID]->getLengthInBytes();
+            return str_pad($this->value->toBytes(), $length, "\0", STR_PAD_LEFT);
+        }
+        return $this->value->toBytes();
     }
 
     /**

From 426de8d5bf95f5053bac76f21aefd1425724adf6 Mon Sep 17 00:00:00 2001
From: terrafrost <terrafrost@php.net>
Date: Wed, 26 Jul 2023 21:54:02 -0500
Subject: [PATCH 3/3] Tests: tweak unit test

---
 tests/Unit/Math/PrimeFieldTest.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tests/Unit/Math/PrimeFieldTest.php b/tests/Unit/Math/PrimeFieldTest.php
index 5d003b01..3f6f10f1 100644
--- a/tests/Unit/Math/PrimeFieldTest.php
+++ b/tests/Unit/Math/PrimeFieldTest.php
@@ -35,6 +35,6 @@ class PrimeFieldTest extends PhpseclibTestCase
             new \phpseclib3\Crypt\EC\Curves\secp192r1()
         );
 
-        $point[0]->toBytes();
+        $this->assertIsString($point[0]->toBytes());
     }
 }