From 47c419545afa35073b60c609c8b5aacb406a1f78 Mon Sep 17 00:00:00 2001
From: Matej Kravjar <matej.kravjar@gmail.com>
Date: Tue, 20 Jun 2017 12:40:49 +0200
Subject: [PATCH] Fixed #632 Fatal error: Cannot access self:: when no class
 scope is active

---
 phpseclib/Crypt/DES.php            |  4 ++--
 tests/Unit/Crypt/TripleDESTest.php | 11 +++++++++++
 2 files changed, 13 insertions(+), 2 deletions(-)

diff --git a/phpseclib/Crypt/DES.php b/phpseclib/Crypt/DES.php
index 51220469..9a8225fb 100644
--- a/phpseclib/Crypt/DES.php
+++ b/phpseclib/Crypt/DES.php
@@ -1357,8 +1357,8 @@ class DES extends Base
                         $k[self::ENCRYPT][$i] = '$ke[' . $i . ']';
                         $k[self::DECRYPT][$i] = '$kd[' . $i . ']';
                     }
-                    $init_encrypt = '$ke = $self->keys[self::ENCRYPT];';
-                    $init_decrypt = '$kd = $self->keys[self::DECRYPT];';
+                    $init_encrypt = '$ke = $self->keys[$self::ENCRYPT];';
+                    $init_decrypt = '$kd = $self->keys[$self::DECRYPT];';
                     break;
             }
 
diff --git a/tests/Unit/Crypt/TripleDESTest.php b/tests/Unit/Crypt/TripleDESTest.php
index e41c4386..36ad218d 100644
--- a/tests/Unit/Crypt/TripleDESTest.php
+++ b/tests/Unit/Crypt/TripleDESTest.php
@@ -186,4 +186,15 @@ class Unit_Crypt_TripleDESTest extends PhpseclibTestCase
             $this->assertEquals($result, $expected, "Failed asserting inner chainin worked correctly in $engineName engine");
         }
     }
+
+    // test special case lambda function error
+    public function testCorrectSelfUseInLambda()
+    {
+        $td = new TripleDES( TripleDES::MODE_ECB );
+        $td->setPreferredEngine( TripleDES::ENGINE_INTERNAL );
+        for ( $i = 0; $i < 20; $i++ ) {
+            $td->setKey( str_repeat( 'a', 20 ) . pack( 'V', mt_rand() ) );
+            $td->encrypt( str_repeat( 'a', 32 ) );
+        }
+    }
 }