Canonicalization is not performed

[tamersalama]

The canonicalization doesn't seem to be performed. The XML Signature for the current assertion message validates properly, however - when attribute orders change the validation fails.

Passes Validation:

<Assertion xmlns="urn:oasis:names:tc:SAML:2.0:assertion" ID="_71be78a0-98a7-0130-e799-4dcd5b4422b3"
           IssueInstant="2013-05-06T18:19:41Z" Version="2.0">
  <Issuer>example.com/Issuer>
  <Subject>
    <NameID Format="urn:oasis:names:tc:SAML:1.1:nameid-format:unspecified">SOMENAME</NameID>
    <SubjectConfirmation Method="urn:oasis:names:tc:SAML:2.0:cm:bearer">
      <SubjectConfirmationData InResponseTo="samlr-838de9f0-b679-11e2-b86c-0024811fab45" NotOnOrAfter="2013-05-06T18:22:41Z" Recipient="http://example.com/sso/consume"></SubjectConfirmationData>
    </SubjectConfirmation>
  </Subject>
  <Conditions NotBefore="2013-05-06T18:19:36Z" NotOnOrAfter="2013-05-06T19:19:41Z">
    <AudienceRestriction>
      <Audience>http://example.com/sso/consume</Audience>
    </AudienceRestriction>
  </Conditions>
  <AttributeStatement>
    <Attribute Name="CustomName"
               NameFormat="urn:oasis:names:tc:SAML:2.0:attrname-format:unspecified"
               FriendlyName="CustomName">
      <AttributeValue>SOMENAME</AttributeValue>
    </Attribute>
  </AttributeStatement>
  <AuthnStatement AuthnInstant="2013-05-06T18:19:41Z" SessionIndex="_71be78a0-98a7-0130-e799-4dcd5b4422b3">
    <AuthnContext>
<AuthnContextClassRef>urn:federation:authentication:windows</AuthnContextClassRef>
    </AuthnContext>
  </AuthnStatement>
</Assertion>

Fails Validation (changed attribute order for Attribute):

...
<Attribute FriendlyName="CustomName" Name="CustomName"
               NameFormat="urn:oasis:names:tc:SAML:2.0:attrname-format:unspecified"
               >
...