diff --git a/src/zeep/wsse/signature.py b/src/zeep/wsse/signature.py
index c4aec758..abfb3d50 100644
--- a/src/zeep/wsse/signature.py
+++ b/src/zeep/wsse/signature.py
@@ -94,11 +94,7 @@ def __init__(
         )
 
 
-class BinarySignature(Signature):
-    """Sign given SOAP envelope with WSSE sig using given key file and cert file.
-
-    Place the key information into BinarySecurityElement."""
-
+class _BinarySignatureMixin:
     def apply(self, envelope, headers):
         key = _make_sign_key(self.key_data, self.cert_data, self.password)
         _sign_envelope_with_key_binary(
@@ -107,6 +103,18 @@ def apply(self, envelope, headers):
         return envelope, headers
 
 
+class BinaryMemorySignature(_BinarySignatureMixin, MemorySignature):
+    """Sign given SOAP envelope with WSSE sig using given key and cert.
+
+    Place the key information into BinarySecurityElement."""
+
+
+class BinarySignature(_BinarySignatureMixin, Signature):
+    """Sign given SOAP envelope with WSSE sig using given key file and cert file.
+
+    Place the key information into BinarySecurityElement."""
+
+
 def check_xmlsec_import():
     if xmlsec is None:
         raise ImportError(