From a61e8f46e78d511b5c0678189e3a86de226b7c7c Mon Sep 17 00:00:00 2001
From: Derek Cameron <derek@concrete5.co.jp>
Date: Tue, 14 Sep 2021 20:01:22 +0900
Subject: [PATCH] PHP8 Compatibility changes from Auth0

---
 src/Signer/OpenSSL.php | 17 ++++++++++++++---
 1 file changed, 14 insertions(+), 3 deletions(-)

diff --git a/src/Signer/OpenSSL.php b/src/Signer/OpenSSL.php
index 1c7706cc..f598c530 100644
--- a/src/Signer/OpenSSL.php
+++ b/src/Signer/OpenSSL.php
@@ -13,6 +13,13 @@

 abstract class OpenSSL extends BaseSigner
 {
+    private $phpVersion8 = false;
+
+    public function __construct()
+    {
+        $this->phpVersion8 = (PHP_MAJOR_VERSION >= 8);
+    }
+
     public function createHash($payload, Key $key)
     {
         $privateKey = $this->getPrivateKey($key->getContent(), $key->getPassphrase());
@@ -26,7 +33,9 @@ public function createHash($payload, Key $key)

             return $signature;
         } finally {
-            openssl_free_key($privateKey);
+            if (!$this->phpVersion8) {
+                openssl_free_key($privateKey);
+            }
         }
     }

@@ -54,7 +63,9 @@ public function doVerify($expected, $payload, Key $key)
     {
         $publicKey = $this->getPublicKey($key->getContent());
         $result    = openssl_verify($payload, $expected, $publicKey, $this->getAlgorithm());
-        openssl_free_key($publicKey);
+        if (!$this->phpVersion8) {
+            openssl_free_key($publicKey);
+        }

         return $result === 1;
     }
@@ -81,7 +92,7 @@ private function getPublicKey($pem)
      */
     private function validateKey($key)
     {
-        if (! is_resource($key)) {
+        if (($this->phpVersion8 && $key === false) || (!$this->phpVersion8 && !is_resource($key))) {
             throw InvalidKeyProvided::cannotBeParsed(openssl_error_string());
         }