diff --git a/xycrypto/hashes.py b/xycrypto/hashes.py
index 81bd37c..0329ec2 100644
--- a/xycrypto/hashes.py
+++ b/xycrypto/hashes.py
@@ -52,9 +52,9 @@ def copy(self):
     def hash(cls, data, **kwargs):
         """Return hash of data from byte string or unicode string."""
 
-        ctx = cls(**kwargs)
         if isinstance(data, str):
             data = data.encode('utf-8')
+        ctx = cls(**kwargs)
         ctx.update(data)
         return ctx.finalize()
 
diff --git a/xycrypto/hmac.py b/xycrypto/hmac.py
index d6020f2..90e1b34 100644
--- a/xycrypto/hmac.py
+++ b/xycrypto/hmac.py
@@ -68,9 +68,9 @@ def copy(self):
     def hash(cls, hash_cls, key, data, **kwargs):
         """Return hash of data from byte string or unicode string."""
 
-        ctx = cls(hash_cls, key, **kwargs)
         if isinstance(data, str):
             data = data.encode('utf-8')
+        ctx = cls(hash_cls, key, **kwargs)
         ctx.update(data)
         return ctx.finalize()