phpseclib
diff --git a/‎composer.json
Copy file name to clipboardExpand all lines: composer.json
+1-1Lines changed: 1 addition & 1 deletion b/‎composer.json
Copy file name to clipboardExpand all lines: composer.json
+1-1Lines changed: 1 addition & 1 deletion
diff --git a/‎lib/mcrypt.php
Copy file name to clipboardExpand all lines: lib/mcrypt.php
+4-1Lines changed: 4 additions & 1 deletion b/‎lib/mcrypt.php
Copy file name to clipboardExpand all lines: lib/mcrypt.php
+4-1Lines changed: 4 additions & 1 deletion
diff --git a/‎tests/MCryptCompatTest.php
Copy file name to clipboardExpand all lines: tests/MCryptCompatTest.php
+48Lines changed: 48 additions & 0 deletions b/‎tests/MCryptCompatTest.php
Copy file name to clipboardExpand all lines: tests/MCryptCompatTest.php
+48Lines changed: 48 additions & 0 deletions
@@ -23,7 +23,7 @@
     },
     "require": {
         "php": ">=5.6.1",
-        "phpseclib/phpseclib": ">=3.0.12 <4.0.0"
+        "phpseclib/phpseclib": ">=3.0.13 <4.0.0"
     },
     "require-dev": {
         "phpunit/phpunit": "^5.7|^6.0|^9.4"
 
@@ -226,7 +226,7 @@ function phpseclib_mcrypt_list_modes($lib_dir = '')
             'ecb',
             'ncfb',
             'nofb',
-            //'ofb',
+            'ofb',
             'stream'
         );
     }
@@ -273,6 +273,7 @@ function phpseclib_mcrypt_module_open($algorithm, $algorithm_directory, $mode, $
             'ecb' => 'ecb',
             'cbc' => 'cbc',
             'cfb' => 'cfb8',
+            'ofb' => 'ofb8',
             'ncfb'=> 'cfb',
             'nofb'=> 'ofb',
             'stream' => 'stream'
@@ -571,6 +572,7 @@ function phpseclib_mcrypt_enc_get_modes_name(Base $td)
             case 'ofb';
                 return 'n' . strtoupper($mode);
             case 'cfb8':
+            case 'ofb8':
                 return strtoupper(substr($mode, 0, 3));
             default:
                 return strtoupper($mode);
@@ -847,6 +849,7 @@ function phpseclib_mcrypt_module_is_block_algorithm_mode($mode, $lib_dir = '')
             case 'ctr':
             case 'ecb':
             case 'cfb':
+            case 'ofb':
             case 'ncfb':
             case 'nofb':
                 return true;
 
@@ -974,6 +974,53 @@ public function test128ByteRC2Key()
         }
     }
 
+    public function testOFB()
+    {
+        $key = str_repeat('x', 32);
+        $iv = str_repeat('x', 32);
+        $plaintext = 'zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz';
+        $ciphertext = '3d49c7fab4f20c3cc2a54e5c0a22a4feceffb6fc758ee3800380614042c567731a35cf';
+
+        $td = phpseclib_mcrypt_module_open('rijndael-256', '', 'ofb', '');
+        phpseclib_mcrypt_generic_init($td, $key, $iv);
+        $mcrypt = bin2hex(phpseclib_mcrypt_generic($td, $plaintext));
+
+        $this->assertEquals(
+            $ciphertext,
+            $mcrypt
+        );
+
+        $td = phpseclib_mcrypt_module_open('rijndael-256', '', 'ofb', '');
+        phpseclib_mcrypt_generic_init($td, $key, $iv);
+        $mcrypt = bin2hex(phpseclib_mcrypt_generic($td, substr($plaintext, 0, -1)));
+        $mcrypt.= bin2hex(phpseclib_mcrypt_generic($td, substr($plaintext, -1)));
+
+        $this->assertEquals(
+            $ciphertext,
+            $mcrypt
+        );
+
+        $td = phpseclib_mcrypt_module_open('rijndael-256', '', 'ofb', '');
+        phpseclib_mcrypt_generic_init($td, $key, $iv);
+        $reference = phpseclib_mdecrypt_generic($td, pack('H*', $ciphertext));
+
+        $this->assertEquals(
+            $plaintext,
+            $reference
+        );
+
+        if (extension_loaded('mcrypt')) {
+            $td = mcrypt_module_open('rijndael-256', '', 'ofb', '');
+            mcrypt_generic_init($td, $key, $iv);
+            $mcrypt = bin2hex(mcrypt_generic($td, $plaintext));
+
+            $this->assertEquals(
+                $ciphertext,
+                $mcrypt
+            );
+        }
+    }
+
     public function mcryptModuleNameProvider()
     {
         return array(
@@ -1009,6 +1056,7 @@ public function mcryptBlockModuleNameProvider()
             array('ctr', true),
             array('ecb', true),
             array('cfb', true),
+            array('ofb', true),
             array('ncfb', true),
             array('nofb', true),
             array('invalid-mode', false)