1 files changed, 67 insertions, 0 deletions
diff --git a/library/phpsec/PHP/Compat/Function/bcpowmod.php b/library/phpsec/PHP/Compat/Function/bcpowmod.php
new file mode 100644
index 000000000..6ec1b1840
--- /dev/null
+++ b/library/phpsec/PHP/Compat/Function/bcpowmod.php
@@ -0,0 +1,67 @@
+<?php
+// $Id: bcpowmod.php,v 1.1 2007/07/02 04:19:55 terrafrost Exp $
+
+
+/**
+ * Replace bcpowmod()
+ *
+ * @category    PHP
+ * @package     PHP_Compat
+ * @license     LGPL - http://www.gnu.org/licenses/lgpl.html
+ * @copyright   2004-2007 Aidan Lister <aidan@php.net>, Arpad Ray <arpad@php.net>
+ * @link        http://php.net/function.bcpowmod
+ * @author      Sara Golemon <pollita@php.net>
+ * @version     $Revision: 1.1 $
+ * @since       PHP 5.0.0
+ * @require     PHP 4.0.0 (user_error)
+ */
+function php_compat_bcpowmod($x, $y, $modulus, $scale = 0)
+{
+    // Sanity check
+    if (!is_scalar($x)) {
+        user_error('bcpowmod() expects parameter 1 to be string, ' .
+            gettype($x) . ' given', E_USER_WARNING);
+        return false;
+    }
+
+    if (!is_scalar($y)) {
+        user_error('bcpowmod() expects parameter 2 to be string, ' .
+            gettype($y) . ' given', E_USER_WARNING);
+        return false;
+    }
+
+    if (!is_scalar($modulus)) {
+        user_error('bcpowmod() expects parameter 3 to be string, ' .
+            gettype($modulus) . ' given', E_USER_WARNING);
+        return false;
+    }
+
+    if (!is_scalar($scale)) {
+        user_error('bcpowmod() expects parameter 4 to be integer, ' .
+            gettype($scale) . ' given', E_USER_WARNING);
+        return false;
+    }
+
+    $t = '1';
+    while (bccomp($y, '0')) {
+        if (bccomp(bcmod($y, '2'), '0')) {
+            $t = bcmod(bcmul($t, $x), $modulus);
+            $y = bcsub($y, '1');
+        }
+
+        $x = bcmod(bcmul($x, $x), $modulus);
+        $y = bcdiv($y, '2');
+    }
+
+    return $t;    
+}
+
+
+// Define
+if (!function_exists('bcpowmod')) {
+    function bcpowmod($x, $y, $modulus, $scale = 0)
+    {
+        return php_compat_bcpowmod($x, $y, $modulus, $scale);
+    }
+}
+?>
+\ No newline at end of file