diff --git a/phpseclib/Net/SFTP.php b/phpseclib/Net/SFTP.php
index 771535c3..d87ee7d8 100644
--- a/phpseclib/Net/SFTP.php
+++ b/phpseclib/Net/SFTP.php
@@ -2490,12 +2490,31 @@ class SFTP extends SSH2
         return $this->get_stat_cache_prop($path, 'gid');
     }
 
+    /**
+     * Recursively go through rawlist() output to get the total filesize
+     */
+    private static function recursiveFilesize(array $files): int
+    {
+        $size = 0;
+        foreach ($files as $name => $file) {
+            if ($name == '.' || $name == '..') {
+                continue;
+            }
+            $size += is_array($file) ?
+                self::recursiveFilesize($file) :
+                $file->size;
+        }
+        return $size;
+    }
+
     /**
      * Gets file size
      */
-    public function filesize(string $path)
+    public function filesize(string $path, bool $recursive = false)
     {
-        return $this->get_stat_cache_prop($path, 'size');
+        return !$recursive || $this->filetype($path) != 'dir' ?
+            $this->get_stat_cache_prop($path, 'size') :
+            $this->recursiveFilesize($this->rawlist($path, true));
     }
 
     /**
diff --git a/tests/Unit/Crypt/RSA/ModeTest.php b/tests/Unit/Crypt/RSA/ModeTest.php
index fb3bc882..51b76903 100644
--- a/tests/Unit/Crypt/RSA/ModeTest.php
+++ b/tests/Unit/Crypt/RSA/ModeTest.php
@@ -257,7 +257,7 @@ zUlir0ACPypC1Q==
         $this->assertSame($data, $decrypted);
     }
 
-    public function testSettingOnePadding()
+    public function testSettingOnePadding(): void
     {
         $pub = <<<HERE
 -----BEGIN PUBLIC KEY-----