diff --git a/phpseclib/Common/Functions/Strings.php b/phpseclib/Common/Functions/Strings.php
index c1165f38..30d77418 100644
--- a/phpseclib/Common/Functions/Strings.php
+++ b/phpseclib/Common/Functions/Strings.php
@@ -435,7 +435,7 @@ abstract class Strings
         // return str_replace(['+', '/'], ['-', '_'], self::base64_encode($data));
 
         return function_exists('sodium_bin2base64') ?
-            sodium_bin2base64($data, SODIUM_BASE64_VARIANT_URLSAFE) :
+            sodium_bin2base64($data, SODIUM_BASE64_VARIANT_URLSAFE_NO_PADDING) :
             Base64UrlSafe::encode($data);
     }
 
diff --git a/phpseclib/Crypt/EC/Formats/Signature/IEEE.php b/phpseclib/Crypt/EC/Formats/Signature/IEEE.php
index e300b6c1..ae1c648a 100644
--- a/phpseclib/Crypt/EC/Formats/Signature/IEEE.php
+++ b/phpseclib/Crypt/EC/Formats/Signature/IEEE.php
@@ -58,7 +58,7 @@ abstract class IEEE
     {
         $r = $r->toBytes();
         $s = $s->toBytes();
-        $length >>= 3;
+        $length = (int) ceil($length / 8);
         return str_pad($r, $length, "\0", STR_PAD_LEFT) . str_pad($s, $length, "\0", STR_PAD_LEFT);
     }
 }