[xmlsec] encrypting/signing parts of xml

[Aleksey Sanin]

> My both runs gave me exact same answer, as i checked
> the digest values and ny diff utility. 
These options specify the start node for the signatue and
not the data that needs to be signed. In all cases, it is expected
to be <dsig:Signature/>. If you want to sign different parts of XML
then you need to have different templates. See XML DSig spec for more
details about transforms.

> When I execute commmand 
> xmlSecDSigCtxSign(dsigCtx, signNode), signNode is
> always the template, So this means that the API
> calculates the digest of the parent node of the
> template and then signs it.
The API calculates the digest of the XML parts specified in the template
in signNode. Please read the spec.

Aleksey