ecdsasig: allow to skip hashing on signing

beemgraphenebase/ecdsasig.py

@@ -149,7 +149,10 @@ def sign_message(message, wif, hashfn=hashlib.sha256):
     if not isinstance(message, bytes_types):
         message = py23_bytes(message, "utf-8")
 
-    digest = hashfn(message).digest()
+    if hashfn is not None:
+        digest = hashfn(message).digest()
+    else:
+        digest = message
     priv_key = PrivateKey(wif)
     if SECP256K1_MODULE == "secp256k1":
         p = py23_bytes(priv_key)