diff --git a/phpseclib/Net/SSH2.php b/phpseclib/Net/SSH2.php
index 35127d7d..c7760096 100644
--- a/phpseclib/Net/SSH2.php
+++ b/phpseclib/Net/SSH2.php
@@ -840,6 +840,16 @@ class Net_SSH2
      */
     var $windowRows = 24;
 
+    /**
+     * Crypto Engine
+     *
+     * @see Net_SSH2::setCryptoEngine()
+     * @see Net_SSH2::_key_exchange()
+     * @var Integer
+     * @access private
+     */
+    var $crypto_engine = false;
+
     /**
      * Default Constructor.
      *
@@ -941,6 +951,20 @@ class Net_SSH2
         $this->connectionTimeout = $timeout;
     }
 
+    /**
+     * Set Crypto Engine Mode
+     *
+     * Possible $engine values:
+     * CRYPT_MODE_INTERNAL, CRYPT_MODE_MCRYPT
+     *
+     * @param Integer $engine
+     * @access private
+     */
+    function setCryptoEngine($engine)
+    {
+        $this->crypto_engine = $engine;
+    }
+
     /**
      * Connect to an SSHv2 server
      *
@@ -1646,6 +1670,9 @@ class Net_SSH2
         $keyBytes = pack('Na*', strlen($keyBytes), $keyBytes);
 
         if ($this->encrypt) {
+            if ($this->crypto_engine) {
+                $this->encrypt->setEngine($this->crypto_engine);
+            }
             $this->encrypt->enableContinuousBuffer();
             $this->encrypt->disablePadding();
 
@@ -1663,6 +1690,9 @@ class Net_SSH2
         }
 
         if ($this->decrypt) {
+            if ($this->crypto_engine) {
+                $this->decrypt->setEngine($this->crypto_engine);
+            }
             $this->decrypt->enableContinuousBuffer();
             $this->decrypt->disablePadding();