Eliminated RC4 file from vendor directory in favor of moving code inside wrapper class;

the original code no longer seems to be maintained, so it is not composer-friendly.

module/VuFind/src/VuFind/Crypt/RC4.php

 <?php
 /**
- * RC4 encryption class (wrapper around third-party functions)
+ * RC4 encryption class (wrapper around code borrowed from a third-party
+ * developer -- see embedded copyright information on encrypt method)
  *
  * PHP version 5
  *
@@ -27,10 +28,9 @@
  */
 namespace VuFind\Crypt;
 
-require_once APPLICATION_PATH . '/vendor/3rdparty/rc4.php';
-
 /**
- * RC4 encryption class (wrapper around third-party functions)
+ * RC4 encryption class (wrapper around code borrowed from a third-party
+ * developer -- see embedded copyright information on encrypt method)
  *
  * @category VuFind2
  * @package  Crypt
@@ -51,7 +51,39 @@ class RC4
      */
     public static function encrypt($key, $pt)
     {
-        return \rc4Encrypt($key, $pt);
+        /* RC4 symmetric cipher encryption/decryption
+         * Copyright (c) 2006 by Ali Farhadi.
+         * released under the terms of the Gnu Public License.
+         * see the GPL for details.
+         *
+         * Email: ali[at]farhadi[dot]ir
+         * Website: http://farhadi.ir/
+         */
+        $s = array();
+        for ($i=0; $i<256; $i++) {
+            $s[$i] = $i;
+        }
+        $j = 0;
+        $x;
+        for ($i=0; $i<256; $i++) {
+            $j = ($j + $s[$i] + ord($key[$i % strlen($key)])) % 256;
+            $x = $s[$i];
+            $s[$i] = $s[$j];
+            $s[$j] = $x;
+        }
+        $i = 0;
+        $j = 0;
+        $ct = '';
+        $y;
+        for ($y=0; $y<strlen($pt); $y++) {
+            $i = ($i + 1) % 256;
+            $j = ($j + $s[$i]) % 256;
+            $x = $s[$i];
+            $s[$i] = $s[$j];
+            $s[$j] = $x;
+            $ct .= $pt[$y] ^ chr($s[($s[$i] + $s[$j]) % 256]);
+        }
+        return $ct;
     }
 
     /**
@@ -65,6 +97,6 @@ class RC4
     */
     public static function decrypt($key, $ct)
     {
-        return \rc4Decrypt($key, $ct);
+        return static::encrypt($key, $ct);
     }
 }

vendor/3rdparty/rc4.php

-<?php
-/* RC4 symmetric cipher encryption/decryption
- * Copyright (c) 2006 by Ali Farhadi.
- * released under the terms of the Gnu Public License.
- * see the GPL for details.
- *
- * Email: ali[at]farhadi[dot]ir
- * Website: http://farhadi.ir/
- */
-
-/**
- * Encrypt given plain text using the key with RC4 algorithm.
- * All parameters and return value are in binary format.
- *
- * @param string key - secret key for encryption
- * @param string pt - plain text to be encrypted
- * @return string
- */
-function rc4Encrypt($key, $pt) {
-	$s = array();
-	for ($i=0; $i<256; $i++) {
-		$s[$i] = $i;
-	}
-	$j = 0;
-	$x;
-	for ($i=0; $i<256; $i++) {
-		$j = ($j + $s[$i] + ord($key[$i % strlen($key)])) % 256;
-		$x = $s[$i];
-		$s[$i] = $s[$j];
-		$s[$j] = $x;
-	}
-	$i = 0;
-	$j = 0;
-	$ct = '';
-	$y;
-	for ($y=0; $y<strlen($pt); $y++) {
-		$i = ($i + 1) % 256;
-		$j = ($j + $s[$i]) % 256;
-		$x = $s[$i];
-		$s[$i] = $s[$j];
-		$s[$j] = $x;
-		$ct .= $pt[$y] ^ chr($s[($s[$i] + $s[$j]) % 256]);
-	}
-	return $ct;
-}
-
-/**
- * Decrypt given cipher text using the key with RC4 algorithm.
- * All parameters and return value are in binary format.
- *
- * @param string key - secret key for decryption
- * @param string ct - cipher text to be decrypted
- * @return string
-*/
-function rc4Decrypt($key, $ct) {
-	return rc4Encrypt($key, $ct);
-}
-?>
\ No newline at end of file