diff --git a/phpseclib/Crypt/RSA.php b/phpseclib/Crypt/RSA.php
index f7150911..bd2c77df 100644
--- a/phpseclib/Crypt/RSA.php
+++ b/phpseclib/Crypt/RSA.php
@@ -249,6 +249,14 @@ class RSA extends AsymmetricKey
      */
     private static $smallestPrime = 4096;
 
+    /**
+     * Enable Blinding?
+     *
+     * @var bool
+     * @access private
+     */
+    private static $enableBlinding = true;
+
     /**
      * The constructor
      *
@@ -885,7 +893,7 @@ class RSA extends AsymmetricKey
 
         $num_primes = count($this->primes);
 
-        if (defined('CRYPT_RSA_DISABLE_BLINDING')) {
+        if (!static::$enableBlinding) {
             $m_i = [
                 1 => $x->modPow($this->exponents[1], $this->primes[1]),
                 2 => $x->modPow($this->exponents[2], $this->primes[2])
@@ -943,6 +951,26 @@ class RSA extends AsymmetricKey
         return $m;
     }
 
+    /**
+     * Enable RSA Blinding
+     *
+     * @access public
+     */
+    public static function enableBlinding()
+    {
+        static::$enableBlinding = true;
+    }
+
+    /**
+     * Disable RSA Blinding
+     *
+     * @access public
+     */
+    public static function disableBlinding()
+    {
+        static::$enableBlinding = false;
+    }
+
     /**
      * Performs RSA Blinding
      *