diff --git a/phpseclib/Crypt/RSA.php b/phpseclib/Crypt/RSA.php
index 22387be3..59999d70 100644
--- a/phpseclib/Crypt/RSA.php
+++ b/phpseclib/Crypt/RSA.php
@@ -470,7 +470,7 @@ class RSA
                 case defined('MATH_BIGINTEGER_OPENSSL_DISABLE'):
                     define('CRYPT_RSA_MODE', self::MODE_INTERNAL);
                     break;
-                case extension_loaded('openssl') && file_exists($this->configFile):
+                case function_exists('phpinfo') && extension_loaded('openssl') && file_exists($this->configFile):
                     // some versions of XAMPP have mismatched versions of OpenSSL which causes it not to work
                     $versions = array();
 
diff --git a/phpseclib/Math/BigInteger.php b/phpseclib/Math/BigInteger.php
index fc24b914..52adcd45 100644
--- a/phpseclib/Math/BigInteger.php
+++ b/phpseclib/Math/BigInteger.php
@@ -263,7 +263,7 @@ class BigInteger
             }
         }
 
-        if (extension_loaded('openssl') && !defined('MATH_BIGINTEGER_OPENSSL_DISABLE') && !defined('MATH_BIGINTEGER_OPENSSL_ENABLED')) {
+        if (function_exists('phpinfo') && extension_loaded('openssl') && !defined('MATH_BIGINTEGER_OPENSSL_DISABLE') && !defined('MATH_BIGINTEGER_OPENSSL_ENABLED')) {
             // some versions of XAMPP have mismatched versions of OpenSSL which causes it not to work
             $versions = array();