Adding support for publishing digest and signing support in metadata.

src/saml2/metadata.py

@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+from saml2.algsupport import algorithm_support_in_metadata
 from saml2.md import AttributeProfile
 from saml2.sigver import security_context
 from saml2.config import Config
@@ -728,6 +729,12 @@ def entity_descriptor(confd):
         item = mdattr.EntityAttributes(attribute=attr)
         entd.extensions.add_extension_element(item)
 
+    if not entd.extensions:
+        entd.extensions = md.Extensions()
+
+    for item in algorithm_support_in_metadata(confd.xmlsec_binary):
+        entd.extensions.add_extension_element(item)
+
     serves = confd.serves
     if not serves:
         raise SAMLError(