diff --git a/src/Util/KeyAlgorithm/DefaultAlgorithm.php b/src/Util/KeyAlgorithm/DefaultAlgorithm.php
index 08c4009a..14cc5273 100644
--- a/src/Util/KeyAlgorithm/DefaultAlgorithm.php
+++ b/src/Util/KeyAlgorithm/DefaultAlgorithm.php
@@ -18,18 +18,18 @@ class DefaultAlgorithm implements KeyAlgorithmInterface
      */
     public function generate($len = 40)
     {
-        // We generate twice as many bytes here because we want to ensure we have
-        // enough after we base64 encode it to get the length we need because we
-        // take out the "/", "+", and "=" characters.
-        $bytes = openssl_random_pseudo_bytes($len * 2, $strong);
-
-        // We want to stop execution if the key fails because, well, that is bad.
-        if ($bytes === false || $strong === false) {
-            // @codeCoverageIgnoreStart
-            throw new \Exception('Error Generating Key');
-            // @codeCoverageIgnoreEnd
-        }
-
-        return substr(str_replace(['/', '+', '='], '', base64_encode($bytes)), 0, $len);
+        $stripped = '';
+        do {
+            $bytes = openssl_random_pseudo_bytes($len, $strong);
+    
+            // We want to stop execution if the key fails because, well, that is bad.
+            if ($bytes === false || $strong === false) {
+                // @codeCoverageIgnoreStart
+                throw new \Exception('Error Generating Key');
+                // @codeCoverageIgnoreEnd
+            }
+            $stripped .= str_replace(['/', '+', '='], '', base64_encode($bytes));
+        } while (strlen($stripped) < $len);
+        return substr($stripped, 0, $len);
     }
 }