Signature r+s concatenation serialization.

nkms/crypto/signature.py

@@ -43,8 +43,14 @@ class Signature(object):
         return encode_dss_signature(self.r, self.s)
 
     def __bytes__(self):
-        """
-        Implements the __bytes__ call for Signature to transform into a
-        transportable mode.
-        """
-        return self.sig_as_bytes
+        # A couple quick assertions to be sure this is OK.  Remove these at some point.
+        assert self.r.to_bytes(33, "big")[0] == 0, "Is 32 bytes enough?"
+        assert self.s.to_bytes(33, "big")[0] == 0, "Is 32 bytes enough?"
+        return self.r.to_bytes(32, "big") + self.s.to_bytes(32, "big")
+
+    def __len__(self):
+        return len(bytes(self))
+
+    def __add__(self, other):
+        return bytes(self) + other
+    __radd__ = __add__