diff --git a/phpseclib/Crypt/Random.php b/phpseclib/Crypt/Random.php
index 2967affa..1fbb0793 100644
--- a/phpseclib/Crypt/Random.php
+++ b/phpseclib/Crypt/Random.php
@@ -63,6 +63,16 @@ function crypt_random($min = 0, $max = 0x7FFFFFFF)
         return $min;
     }
 
+    if (function_exists('openssl_random_pseudo_bytes')) {
+        // openssl_random_pseudo_bytes() is slow on windows per the following:
+        // http://stackoverflow.com/questions/1940168/openssl-random-pseudo-bytes-is-slow-php
+        if ((PHP_OS & "\xDF\xDF\xDF") != 'WIN') { // PHP_OS & "\xDF\xDF\xDF" == strtoupper(substr(PHP_OS, 0, 3)), but a lot faster
+            extract(unpack('Nrandom', openssl_random_pseudo_bytes(4)));
+
+            return abs($random) % ($max - $min) + $min; 
+        }
+    }
+
     // see http://en.wikipedia.org/wiki//dev/random
     static $urandom = true;
     if ($urandom === true) {