diff --git a/phpseclib/Crypt/AES.php b/phpseclib/Crypt/AES.php
index ad4c48fb..6a75ceb2 100644
--- a/phpseclib/Crypt/AES.php
+++ b/phpseclib/Crypt/AES.php
@@ -242,6 +242,20 @@ class Crypt_AES extends Crypt_Rijndael {
         }
     }
 
+    /**
+     * PHP5-only Default Constructor.
+     *
+     * Intended mainly to simplify namespacing for those who might wish to do it.
+     *
+     * @param optional Integer $mode
+     * @return Crypt_AES
+     * @access public
+     */
+    function __construct($mode = CRYPT_AES_MODE_CBC)
+    {
+        $this->Crypt_AES($mode);
+    }
+
     /**
      * Dummy function
      *
@@ -255,7 +269,6 @@ class Crypt_AES extends Crypt_Rijndael {
         return;
     }
 
-
     /**
      * Sets the initialization vector. (optional)
      *
diff --git a/phpseclib/Crypt/DES.php b/phpseclib/Crypt/DES.php
index 1197a50a..a7a5c1bc 100644
--- a/phpseclib/Crypt/DES.php
+++ b/phpseclib/Crypt/DES.php
@@ -349,6 +349,20 @@ class Crypt_DES {
         }
     }
 
+    /**
+     * PHP5-only Default Constructor.
+     *
+     * Intended mainly to simplify namespacing for those who might wish to do it.
+     *
+     * @param optional Integer $mode
+     * @return Crypt_DES
+     * @access public
+     */
+    function __construct($mode = CRYPT_DES_MODE_CBC)
+    {
+        $this->Crypt_DES($mode);
+    }
+
     /**
      * Sets the key.
      *
diff --git a/phpseclib/Crypt/Hash.php b/phpseclib/Crypt/Hash.php
index c5d314f0..1aef12dd 100644
--- a/phpseclib/Crypt/Hash.php
+++ b/phpseclib/Crypt/Hash.php
@@ -162,6 +162,20 @@ class Crypt_Hash {
         $this->setHash($hash);
     }
 
+    /**
+     * PHP5-only Default Constructor.
+     *
+     * Intended mainly to simplify namespacing for those who might wish to do it.
+     *
+     * @param optional String $hash
+     * @return Crypt_Hash
+     * @access public
+     */
+    function __construct($hash = 'sha1')
+    {
+        $this->Crypt_Hash($hash);
+    }
+
     /**
      * Sets the key for HMACs
      *
diff --git a/phpseclib/Crypt/RC4.php b/phpseclib/Crypt/RC4.php
index b709590a..d6e5fbfc 100644
--- a/phpseclib/Crypt/RC4.php
+++ b/phpseclib/Crypt/RC4.php
@@ -167,7 +167,6 @@ class Crypt_RC4 {
      *
      * Determines whether or not the mcrypt extension should be used.
      *
-     * @param optional Integer $mode
      * @return Crypt_RC4
      * @access public
      */
@@ -198,6 +197,19 @@ class Crypt_RC4 {
         }
     }
 
+    /**
+     * PHP5-only Default Constructor.
+     *
+     * Intended mainly to simplify namespacing for those who might wish to do it.
+     *
+     * @return Crypt_RC4
+     * @access public
+     */
+    function __construct()
+    {
+        $this->Crypt_RC4();
+    }
+
     /**
      * Sets the key.
      *
diff --git a/phpseclib/Crypt/RSA.php b/phpseclib/Crypt/RSA.php
index db1ba158..2b60c0b0 100644
--- a/phpseclib/Crypt/RSA.php
+++ b/phpseclib/Crypt/RSA.php
@@ -487,6 +487,19 @@ class Crypt_RSA {
         $this->mgfHLen = $this->mgfHash->getLength();
     }
 
+    /**
+     * PHP5-only Default Constructor.
+     *
+     * Intended mainly to simplify namespacing for those who might wish to do it.
+     *
+     * @return Crypt_RSA
+     * @access public
+     */
+    function __construct()
+    {
+        $this->Crypt_RSA();
+    }
+
     /**
      * Create public / private key pair
      *
diff --git a/phpseclib/Crypt/Rijndael.php b/phpseclib/Crypt/Rijndael.php
index 335d5233..5997461a 100644
--- a/phpseclib/Crypt/Rijndael.php
+++ b/phpseclib/Crypt/Rijndael.php
@@ -520,6 +520,20 @@ class Crypt_Rijndael {
         }
     }
 
+    /**
+     * PHP5-only Default Constructor.
+     *
+     * Intended mainly to simplify namespacing for those who might wish to do it.
+     *
+     * @param optional Integer $mode
+     * @return Crypt_Rijndael
+     * @access public
+     */
+    function __construct($mode = CRYPT_RIJNDAEL_MODE_CBC)
+    {
+        $this->Crypt_Rijndael($mode);
+    }
+
     /**
      * Sets the key.
      *
diff --git a/phpseclib/Crypt/TripleDES.php b/phpseclib/Crypt/TripleDES.php
index 3b4c8c36..954f0d5b 100644
--- a/phpseclib/Crypt/TripleDES.php
+++ b/phpseclib/Crypt/TripleDES.php
@@ -331,6 +331,20 @@ class Crypt_TripleDES {
         }
     }
 
+    /**
+     * PHP5-only Default Constructor.
+     *
+     * Intended mainly to simplify namespacing for those who might wish to do it.
+     *
+     * @param optional Integer $mode
+     * @return Crypt_TripleDES
+     * @access public
+     */
+    function __construct($mode = CRYPT_DES_MODE_CBC)
+    {
+        $this->Crypt_TripleDES($mode);
+    }
+
     /**
      * Sets the key.
      *
diff --git a/phpseclib/File/ANSI.php b/phpseclib/File/ANSI.php
index 29ad949e..fd0b8953 100644
--- a/phpseclib/File/ANSI.php
+++ b/phpseclib/File/ANSI.php
@@ -219,6 +219,19 @@ class File_ANSI {
         $this->setDimensions(80, 24);
     }
 
+    /**
+     * PHP5-only Default Constructor.
+     *
+     * Intended mainly to simplify namespacing for those who might wish to do it.
+     *
+     * @return Crypt_ANSI
+     * @access public
+     */
+    function __construct()
+    {
+        $this->Crypt_ANSI();
+    }
+
     /**
      * Set terminal width and height
      *
diff --git a/phpseclib/File/ASN1.php b/phpseclib/File/ASN1.php
index 766c6e7e..e812a416 100644
--- a/phpseclib/File/ASN1.php
+++ b/phpseclib/File/ASN1.php
@@ -144,6 +144,20 @@ class File_ASN1_Element {
     {
         $this->element = $encoded;
     }
+
+    /**
+     * PHP5-only Default Constructor.
+     *
+     * Intended mainly to simplify namespacing for those who might wish to do it.
+     *
+     * @param String $encoded
+     * @return File_ASN1_Element
+     * @access public
+     */
+    function __construct($encoded)
+    {
+        $this->File_ASN1_Element($encoded);
+    }
 }
 
 /**
diff --git a/phpseclib/File/X509.php b/phpseclib/File/X509.php
index 8a2acb20..1da4c317 100644
--- a/phpseclib/File/X509.php
+++ b/phpseclib/File/X509.php
@@ -1406,6 +1406,19 @@ class File_X509 {
         );
     }
 
+    /**
+     * PHP5-only Default Constructor.
+     *
+     * Intended mainly to simplify namespacing for those who might wish to do it.
+     *
+     * @return File_X509
+     * @access public
+     */
+    function __construct()
+    {
+        $this->File_X509();
+    }
+
     /**
      * Load X.509 certificate
      *
diff --git a/phpseclib/Math/BigInteger.php b/phpseclib/Math/BigInteger.php
index d048cb03..08fb7c09 100644
--- a/phpseclib/Math/BigInteger.php
+++ b/phpseclib/Math/BigInteger.php
@@ -455,6 +455,21 @@ class Math_BigInteger {
         }
     }
 
+    /**
+     * PHP5-only Default Constructor.
+     *
+     * Intended mainly to simplify namespacing for those who might wish to do it.
+     *
+     * @param optional $x base-10 number or base-$base number if $base set.
+     * @param optional integer $base
+     * @return Math_BigInteger
+     * @access public
+     */
+    function __construct($x = 0, $base = 10)
+    {
+        $this->Math_BigInteger($x, $base);
+    }
+
     /**
      * Converts a BigInteger to a byte string (eg. base-256).
      *
diff --git a/phpseclib/Net/SFTP.php b/phpseclib/Net/SFTP.php
index 8db087d3..2af34bfc 100644
--- a/phpseclib/Net/SFTP.php
+++ b/phpseclib/Net/SFTP.php
@@ -348,6 +348,22 @@ class Net_SFTP extends Net_SSH2 {
         );
     }
 
+    /**
+     * PHP5-only Default Constructor.
+     *
+     * Intended mainly to simplify namespacing for those who might wish to do it.
+     *
+     * @param String $host
+     * @param optional Integer $port
+     * @param optional Integer $timeout
+     * @return Net_SFTP
+     * @access public
+     */
+    function __construct($host, $port = 22, $timeout = 10)
+    {
+        $this->Net_SFTP($host, $port, $timeout);
+    }
+
     /**
      * Login
      *
diff --git a/phpseclib/Net/SSH1.php b/phpseclib/Net/SSH1.php
index 8f5c7993..781c7741 100644
--- a/phpseclib/Net/SSH1.php
+++ b/phpseclib/Net/SSH1.php
@@ -664,6 +664,23 @@ class Net_SSH1 {
         $this->bitmap = NET_SSH1_MASK_CONSTRUCTOR;
     }
 
+    /**
+     * PHP5-only Default Constructor.
+     *
+     * Intended mainly to simplify namespacing for those who might wish to do it.
+     *
+     * @param String $host
+     * @param optional Integer $port
+     * @param optional Integer $timeout
+     * @param optional Integer $cipher
+     * @return Net_SSH1
+     * @access public
+     */
+    function __construct($host, $port = 22, $timeout = 10, $cipher = NET_SSH1_CIPHER_3DES)
+    {
+        $this->__construct($host, $port, $timeout, $cipher);
+    }
+
     /**
      * Login
      *
diff --git a/phpseclib/Net/SSH2.php b/phpseclib/Net/SSH2.php
index 43bfbca2..358802b8 100644
--- a/phpseclib/Net/SSH2.php
+++ b/phpseclib/Net/SSH2.php
@@ -900,6 +900,22 @@ class Net_SSH2 {
         $this->bitmap = NET_SSH2_MASK_CONSTRUCTOR;
     }
 
+    /**
+     * PHP5-only Default Constructor.
+     *
+     * Intended mainly to simplify namespacing for those who might wish to do it.
+     *
+     * @param String $host
+     * @param optional Integer $port
+     * @param optional Integer $timeout
+     * @return Net_SSH2
+     * @access public
+     */
+    function __construct($host, $port = 22, $timeout = 10)
+    {
+        $this->Net_SSH2($host, $port, $timeout);
+    }
+
     /**
      * Key Exchange
      *