diff -up ./CHAP.php.php8 ./CHAP.php
--- ./CHAP.php.php8	2021-04-07 14:09:32.095768893 +0200
+++ ./CHAP.php	2021-04-07 14:10:52.476326364 +0200
@@ -199,7 +199,7 @@ class Crypt_CHAP_MSv1 extends Crypt_CHAP
         $uni = '';
         $str = (string) $str;
         for ($i = 0; $i < strlen($str); $i++) {
-            $a = ord($str{$i}) << 8;
+            $a = ord($str[$i]) << 8;
             $uni .= sprintf("%X", $a);
         }
         return pack('H*', $uni);
@@ -259,23 +259,23 @@ class Crypt_CHAP_MSv1 extends Crypt_CHAP
             $hash .= "\0";
         }
 
-        $td = mcrypt_module_open(MCRYPT_DES, '', MCRYPT_MODE_ECB, '');
-        $iv = mcrypt_create_iv (mcrypt_enc_get_iv_size($td), MCRYPT_RAND);
+        $td = @mcrypt_module_open(MCRYPT_DES, '', MCRYPT_MODE_ECB, '');
+        $iv = @mcrypt_create_iv (mcrypt_enc_get_iv_size($td), MCRYPT_RAND);
         $key = $this->_desAddParity(substr($hash, 0, 7));
-        mcrypt_generic_init($td, $key, $iv);
-        $resp1 = mcrypt_generic($td, $this->challenge);
-        mcrypt_generic_deinit($td);
+        @mcrypt_generic_init($td, $key, $iv);
+        $resp1 = @mcrypt_generic($td, $this->challenge);
+        @mcrypt_generic_deinit($td);
 
         $key = $this->_desAddParity(substr($hash, 7, 7));
-        mcrypt_generic_init($td, $key, $iv);
-        $resp2 = mcrypt_generic($td, $this->challenge);
-        mcrypt_generic_deinit($td);
+        @mcrypt_generic_init($td, $key, $iv);
+        $resp2 = @mcrypt_generic($td, $this->challenge);
+        @mcrypt_generic_deinit($td);
 
         $key = $this->_desAddParity(substr($hash, 14, 7));
-        mcrypt_generic_init($td, $key, $iv);
-        $resp3 = mcrypt_generic($td, $this->challenge);
-        mcrypt_generic_deinit($td);
-        mcrypt_module_close($td);
+        @mcrypt_generic_init($td, $key, $iv);
+        $resp3 = @mcrypt_generic($td, $this->challenge);
+        @mcrypt_generic_deinit($td);
+        @mcrypt_module_close($td);
 
         return $resp1 . $resp2 . $resp3;
     }
@@ -307,12 +307,12 @@ class Crypt_CHAP_MSv1 extends Crypt_CHAP
     function _desHash($plain)
     {
         $key = $this->_desAddParity($plain);
-        $td = mcrypt_module_open(MCRYPT_DES, '', MCRYPT_MODE_ECB, '');
-        $iv = mcrypt_create_iv (mcrypt_enc_get_iv_size($td), MCRYPT_RAND);
-        mcrypt_generic_init($td, $key, $iv);
-        $hash = mcrypt_generic($td, 'KGS!@#$%');
-        mcrypt_generic_deinit($td);
-        mcrypt_module_close($td);
+        $td = @mcrypt_module_open(MCRYPT_DES, '', MCRYPT_MODE_ECB, '');
+        $iv = @mcrypt_create_iv (mcrypt_enc_get_iv_size($td), MCRYPT_RAND);
+        @mcrypt_generic_init($td, $key, $iv);
+        $hash = @mcrypt_generic($td, 'KGS!@#$%');
+        @mcrypt_generic_deinit($td);
+        @mcrypt_module_close($td);
         return $hash;
     }
 
@@ -345,7 +345,7 @@ class Crypt_CHAP_MSv1 extends Crypt_CHAP
 
         $bin = '';
         for ($i = 0; $i < strlen($key); $i++) {
-            $bin .= sprintf('%08s', decbin(ord($key{$i})));
+            $bin .= sprintf('%08s', decbin(ord($key[$i])));
         }
 
         $str1 = explode('-', substr(chunk_split($bin, 7, '-'), 0, -1));