CFB updates

Author: terrafrost

README.md

@@ -40,9 +40,10 @@ composer require phpseclib/mcrypt_compat
 
 - cbc
 - ncfb
+- cfb (master branch only)
 - ctr
 - ecb
 - nofb
 - stream
 
-Although `ncfb` and `nofb` are supported `cfb` and `ofb` are not. Further, mcrypt_compat's `ncfb` implementation has some incompatibles with mcrypt's implementation where `mcrypt_generic` and `mdecrypt_generic` are concerned. The unit tests elaborate.
+Although `nofb` is supported `ofb` is not. Further, mcrypt_compat's `ncfb` implementation has some incompatibles with mcrypt's implementation where `mcrypt_generic` and `mdecrypt_generic` are concerned. The unit tests elaborate.

lib/mcrypt.php

@@ -221,7 +221,7 @@ function phpseclib_mcrypt_list_modes($lib_dir = '')
     {
         return array(
             'cbc',
-            //'cfb',
+            'cfb',
             'ctr',
             'ecb',
             'ncfb',
@@ -846,6 +846,7 @@ function phpseclib_mcrypt_module_is_block_algorithm_mode($mode, $lib_dir = '')
             case 'cbc':
             case 'ctr':
             case 'ecb':
+            case 'cfb':
             case 'ncfb':
             case 'nofb':
                 return true;