diff --git a/phpseclib/Crypt/Common/PKCS.php b/phpseclib/Crypt/Common/PKCS.php
index d3b2de85..937287e4 100644
--- a/phpseclib/Crypt/Common/PKCS.php
+++ b/phpseclib/Crypt/Common/PKCS.php
@@ -44,14 +44,14 @@ abstract class PKCS
      * @access private
      * @param int
      */
-    static $format = self::MODE_ANY;
+    protected static $format = self::MODE_ANY;
 
     /**
      * Require base64-encoded PEM's be supplied
      *
      * @access public
      */
-    static function requirePEM()
+    public static function requirePEM()
     {
         self::$format = self::MODE_PEM;
     }
@@ -61,7 +61,7 @@ abstract class PKCS
      *
      * @access public
      */
-    static function requireDER()
+    public static function requireDER()
     {
         self::$format = self::MODE_DER;
     }
@@ -73,7 +73,7 @@ abstract class PKCS
      *
      * @access public
      */
-    static function requireAny()
+    public static function requireAny()
     {
         self::$format = self::MODE_ANY;
     }
diff --git a/phpseclib/Crypt/Common/PKCS1.php b/phpseclib/Crypt/Common/PKCS1.php
index e5b3c756..dc9d3a55 100644
--- a/phpseclib/Crypt/Common/PKCS1.php
+++ b/phpseclib/Crypt/Common/PKCS1.php
@@ -40,7 +40,7 @@ abstract class PKCS1 extends PKCS
      * @var string
      * @access private
      */
-    static $defaultEncryptionAlgorithm = 'AES-128-CBC';
+    private static $defaultEncryptionAlgorithm = 'AES-128-CBC';
 
     /**
      * Sets the default encryption algorithm
@@ -48,7 +48,7 @@ abstract class PKCS1 extends PKCS
      * @access public
      * @param string $algo
      */
-    static function setEncryptionAlgorithm($algo)
+    public static function setEncryptionAlgorithm($algo)
     {
         self::$defaultEncryptionAlgorithm = $algo;
     }
@@ -61,7 +61,7 @@ abstract class PKCS1 extends PKCS
      * @return int
      * @throws \UnexpectedValueException if the block cipher mode is unsupported
      */
-    static function getEncryptionMode($mode)
+    public static function getEncryptionMode($mode)
     {
         switch ($mode) {
             case 'CBC':
@@ -86,7 +86,7 @@ abstract class PKCS1 extends PKCS
      * @return string
      * @throws \UnexpectedValueException if the encryption algorithm is unsupported
      */
-    static function getEncryptionObject($algo)
+    public static function getEncryptionObject($algo)
     {
         $modes = '(CBC|ECB|CFB|OFB|CTR)';
         switch (true) {
@@ -112,7 +112,7 @@ abstract class PKCS1 extends PKCS
      * @param int $length
      * @return string
      */
-    static function generateSymmetricKey($password, $iv, $length)
+    public static function generateSymmetricKey($password, $iv, $length)
     {
         $symkey = '';
         $iv = substr($iv, 0, 8);
@@ -130,7 +130,7 @@ abstract class PKCS1 extends PKCS
      * @param string $password optional
      * @return array
      */
-    static function load($key, $password)
+    public static function load($key, $password)
     {
         if (!is_string($key)) {
             return false;
@@ -186,7 +186,7 @@ abstract class PKCS1 extends PKCS
      * @param string $password
      * @return string
      */
-    static function wrapPrivateKey($key, $type, $password)
+    public static function wrapPrivateKey($key, $type, $password)
     {
         if (empty($password) || !is_string($password)) {
             return "-----BEGIN $type PRIVATE KEY-----\r\n" .
@@ -215,7 +215,7 @@ abstract class PKCS1 extends PKCS
      * @param string $type
      * @return string
      */
-    static function wrapPublicKey($key, $type)
+    public static function wrapPublicKey($key, $type)
     {
         return "-----BEGIN $type PUBLIC KEY-----\r\n" .
                chunk_split(Base64::encode($key), 64) .
diff --git a/phpseclib/Crypt/Common/PKCS8.php b/phpseclib/Crypt/Common/PKCS8.php
index 0b193fc3..f217686a 100644
--- a/phpseclib/Crypt/Common/PKCS8.php
+++ b/phpseclib/Crypt/Common/PKCS8.php
@@ -55,7 +55,7 @@ class PKCS8 extends PKCS
      * @var string
      * @access private
      */
-    static $defaultEncryptionAlgorithm = 'id-PBES2';
+    private static $defaultEncryptionAlgorithm = 'id-PBES2';
 
     /**
      * Default encryption scheme
@@ -65,7 +65,7 @@ class PKCS8 extends PKCS
      * @var string
      * @access private
      */
-    static $defaultEncryptionScheme = 'aes128-CBC-PAD';
+    private static $defaultEncryptionScheme = 'aes128-CBC-PAD';
 
     /**
      * Default PRF
@@ -75,7 +75,7 @@ class PKCS8 extends PKCS
      * @var string
      * @access private
      */
-    static $defaultPRF = 'id-hmacWithSHA256';
+    private static $defaultPRF = 'id-hmacWithSHA256';
 
     /**
      * Default Iteration Count
@@ -83,7 +83,7 @@ class PKCS8 extends PKCS
      * @var int
      * @access private
      */
-    static $defaultIterationCount = 2048;
+    private static $defaultIterationCount = 2048;
 
     /**
      * OIDs loaded
@@ -91,7 +91,7 @@ class PKCS8 extends PKCS
      * @var bool
      * @access private
      */
-    static $oidsLoaded = false;
+    private static $oidsLoaded = false;
 
     /**
      * Sets the default encryption algorithm
@@ -99,7 +99,7 @@ class PKCS8 extends PKCS
      * @access public
      * @param string $algo
      */
-    static function setEncryptionAlgorithm($algo)
+    public static function setEncryptionAlgorithm($algo)
     {
         self::$defaultEncryptionAlgorithm = $algo;
     }
@@ -110,7 +110,7 @@ class PKCS8 extends PKCS
      * @access public
      * @param string $algo
      */
-    static function setEncryptionScheme($algo)
+    public static function setEncryptionScheme($algo)
     {
         self::$defaultEncryptionScheme = $algo;
     }
@@ -121,7 +121,7 @@ class PKCS8 extends PKCS
      * @access public
      * @param int $count
      */
-    static function setIterationCount($count)
+    public static function setIterationCount($count)
     {
         self::$defaultIterationCount = $count;
     }
@@ -132,7 +132,7 @@ class PKCS8 extends PKCS
      * @access public
      * @param string $algo
      */
-    static function setPRF($algo)
+    public static function setPRF($algo)
     {
         self::$defaultPRF = $algo;
     }
@@ -143,7 +143,7 @@ class PKCS8 extends PKCS
      * @access public
      * @param string $algo
      */
-    static function getPBES1EncryptionObject($algo)
+    public static function getPBES1EncryptionObject($algo)
     {
         $algo = preg_match('#^pbeWith(?:MD2|MD5|SHA1|SHA)And(.*?)-CBC$#', $algo, $matches) ?
             $matches[1] :
@@ -192,7 +192,7 @@ class PKCS8 extends PKCS
      * @access public
      * @param string $algo
      */
-    static function getPBES1Hash($algo)
+    public static function getPBES1Hash($algo)
     {
         if (preg_match('#^pbeWith(MD2|MD5|SHA1|SHA)And.*?-CBC$#', $algo, $matches)) {
             return $matches[1] == 'SHA' ? 'sha1' : $matches[1];
@@ -207,7 +207,7 @@ class PKCS8 extends PKCS
      * @access public
      * @param string $algo
      */
-    static function getPBES1KDF($algo)
+    public static function getPBES1KDF($algo)
     {
         switch ($algo) {
             case 'pbeWithMD2AndDES-CBC':
@@ -228,7 +228,7 @@ class PKCS8 extends PKCS
      * @access public
      * @param string $algo
      */
-    static function getPBES2EncryptionObject($algo)
+    public static function getPBES2EncryptionObject($algo)
     {
         switch ($algo) {
             case 'desCBC':
@@ -262,7 +262,7 @@ class PKCS8 extends PKCS
      *
      * @access private
      */
-    static function _initialize_static_variables()
+    public static function _initialize_static_variables()
     {
         if (!self::$oidsLoaded) {
             // from https://tools.ietf.org/html/rfc2898
@@ -318,7 +318,7 @@ class PKCS8 extends PKCS
      * @param string $password optional
      * @return array
      */
-    static function load($key, $password = '')
+    public static function load($key, $password = '')
     {
         self::_initialize_static_variables();
 
@@ -482,7 +482,7 @@ class PKCS8 extends PKCS
      * @param string $password
      * @return string
      */
-    static function wrapPrivateKey($key, $algorithm, $attr, $password)
+    public static function wrapPrivateKey($key, $algorithm, $attr, $password)
     {
         self::_initialize_static_variables();
 
@@ -577,7 +577,7 @@ class PKCS8 extends PKCS
      * @param string $key
      * @return string
      */
-    static function wrapPublicKey($key, $algorithm)
+    public static function wrapPublicKey($key, $algorithm)
     {
         self::_initialize_static_variables();
 
diff --git a/phpseclib/Crypt/Hash.php b/phpseclib/Crypt/Hash.php
index d042a639..a95078b9 100644
--- a/phpseclib/Crypt/Hash.php
+++ b/phpseclib/Crypt/Hash.php
@@ -52,7 +52,7 @@ class Hash
      * @var int
      * @access private
      */
-    var $hashParam;
+    private $hashParam;
 
     /**
      * Byte-length of hash output (Internal HMAC)
@@ -61,7 +61,7 @@ class Hash
      * @var int
      * @access private
      */
-    var $length;
+    private $length;
 
     /**
      * Hash Algorithm
@@ -70,7 +70,7 @@ class Hash
      * @var string
      * @access private
      */
-    var $hash;
+    private $hash;
 
     /**
      * Key
@@ -79,7 +79,7 @@ class Hash
      * @var string
      * @access private
      */
-    var $key = false;
+    private $key = false;
 
     /**
      * Initial Hash
@@ -90,7 +90,7 @@ class Hash
      * @var array
      * @access private
      */
-    var $initial = false;
+    private $initial = false;
 
     /**
      * Outer XOR (Internal HMAC)
@@ -101,7 +101,7 @@ class Hash
      * @var string
      * @access private
      */
-    var $opad;
+    private $opad;
 
     /**
      * Inner XOR (Internal HMAC)
@@ -112,7 +112,7 @@ class Hash
      * @var string
      * @access private
      */
-    var $ipad;
+    private $ipad;
 
     /**
      * Default Constructor.
@@ -120,7 +120,7 @@ class Hash
      * @param string $hash
      * @access public
      */
-    function __construct($hash = 'sha256')
+    public function __construct($hash = 'sha256')
     {
         $this->setHash($hash);
 
@@ -136,7 +136,7 @@ class Hash
      * @access public
      * @param string $key
      */
-    function setKey($key = false)
+    public function setKey($key = false)
     {
         $this->key = $key;
     }
@@ -149,7 +149,7 @@ class Hash
      * @access public
      * @return string
      */
-    function getHash()
+    public function getHash()
     {
         return $this->hashParam;
     }
@@ -160,7 +160,7 @@ class Hash
      * @access public
      * @param string $hash
      */
-    function setHash($hash)
+    public function setHash($hash)
     {
         $this->hashParam = $hash = strtolower($hash);
         switch ($hash) {
@@ -247,7 +247,7 @@ class Hash
      * @param string $text
      * @return string
      */
-    function hash($text)
+    public function hash($text)
     {
         switch ($this->hash) {
             case 'sha512/224':
@@ -286,7 +286,7 @@ class Hash
      * @access public
      * @return int
      */
-    function getLength()
+    public function getLength()
     {
         return $this->length << 3;
     }
@@ -297,7 +297,7 @@ class Hash
      * @access public
      * @return int
      */
-    function getLengthInBytes()
+    public function getLengthInBytes()
     {
         return $this->length;
     }
@@ -308,7 +308,7 @@ class Hash
      * @access public
      * @return int
      */
-    function getBlockLength()
+    public function getBlockLength()
     {
         return $this->blockSize;
     }
@@ -319,7 +319,7 @@ class Hash
      * @access public
      * @return int
      */
-    function getBlockLengthInBytes()
+    public function getBlockLengthInBytes()
     {
         return $this->blockSize >> 3;
     }
@@ -330,7 +330,7 @@ class Hash
      * @access private
      * @param string $m
      */
-    static function _sha512($m, $hash)
+    private static function _sha512($m, $hash)
     {
         static $k;
 
diff --git a/phpseclib/Crypt/Random.php b/phpseclib/Crypt/Random.php
index 3035035c..071f5ed8 100644
--- a/phpseclib/Crypt/Random.php
+++ b/phpseclib/Crypt/Random.php
@@ -46,7 +46,7 @@ abstract class Random
      * @throws \RuntimeException if a symmetric cipher is needed but not loaded
      * @return string
      */
-    static function string($length)
+    public static function string($length)
     {
         try {
             return \random_bytes($length);
@@ -196,7 +196,7 @@ abstract class Random
      * @param mixed $arr
      * @access public
      */
-    static function safe_serialize(&$arr)
+    private static function safe_serialize(&$arr)
     {
         if (is_object($arr)) {
             return '';