From 2026b0c0db7f4b027af4da07b6223534dca13d23 Mon Sep 17 00:00:00 2001
From: terrafrost <terrafrost@gmail.com>
Date: Sat, 27 Aug 2022 07:59:39 -0500
Subject: [PATCH] Hash: fix PHP 8.2 error

see https://github.com/php/php-src/issues/8924
---
 phpseclib/Crypt/Hash.php | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/phpseclib/Crypt/Hash.php b/phpseclib/Crypt/Hash.php
index 8f95772f..0e02544e 100644
--- a/phpseclib/Crypt/Hash.php
+++ b/phpseclib/Crypt/Hash.php
@@ -575,10 +575,10 @@ class Hash
         // For the last chunk: pad to 32-byte boundary, endian-adjust,
         // NH hash and add bit-length.  Concatenate the result to Y.
         //
-        $length = strlen($m[$i]);
+        $length = count($m) ? strlen($m[$i]) : 0;
         $pad = 32 - ($length % 32);
         $pad = max(32, $length + $pad % 32);
-        $m[$i] = str_pad($m[$i], $pad, "\0"); // zeropad
+        $m[$i] = str_pad(isset($m[$i]) ? $m[$i] : '', $pad, "\0"); // zeropad
         $m[$i] = pack('N*', ...unpack('V*', $m[$i])); // ENDIAN-SWAP
 
         $y .= static::nh($k, $m[$i], new BigInteger($length * 8));