OpenSAML user discussion

[Brent Putman <>]

That's an "expected" error.  You need to marshall the object to be
signed before you call Signer.signObject(sig).  So in your case your
need to first marshall the response, after you call
response.setSignature(sig).

That process is documented here:

https://spaces.internet2.edu/display/SHIB/OSTwoUserManJavaDSIG

--Brent



Mike Klein wrote:
>     public static Response signResponse(Response response)
>     {
>         try
>         {
>             SignatureBuilder builder = new SignatureBuilder();
>             SignatureImpl sig = builder.buildObject();
>             SAMLObjectContentReference socr = new
> SAMLObjectContentReference(response);
>             sig.getContentReferences().add(socr);
>             sig.setSigningKey(signingKey);
>             response.setSignature(sig);
>             Signer.signObject(sig);
>              ...
>
> However on last statement I am getting following:
>
> 2007-05-12 18:18:32,693 WARN  [Signer] Unable to compute signature,
> Signature XMLObject does not have the XMLSignature created during
> marshalling.
> 1225078 [http-0.0.0.0-8080-Processor2] WARN
> org.opensaml.xml.signature.Signer  - Unable to compute signature,
> Signature XMLObject does not have the XMLSignature created during
> marshalling.
> 2007-05-12 18:18:32,850 ERROR [SignatureMarshaller] Unable to construct
> signature Element {http://www.w3.org/2000/09/xmldsig#}Signature
> org.apache.xml.security.signature.XMLSignatureException: The requested
> algorithm null does not exist. Original Message was: null
> Original Exception was java.lang.NullPointerException
>     at
> org.apache.xml.security.algorithms.SignatureAlgorithm.<init>(Unknown Source)
>