diff --git a/src/EasyECC.php b/src/EasyECC.php
index 3bc909b..ed9f532 100644
--- a/src/EasyECC.php
+++ b/src/EasyECC.php
@@ -221,7 +221,7 @@ public function sign(
             EccFactory::getAdapter(),
             $privateKey,
             $hash,
-            'sha384'
+            $this->hashAlgo
         );
         $k = $kGen->generate($this->generator->getOrder());