[xmlsec] Handling CID: moniker to sign attachments

[Robert Fox]

I am new to libxml and xmlsec, and having a hard time figuring out how
to wedge in a protocol handler to take care of resolving cid references.
I looked at the links below, and just am not sure how this would work
for selectively handling cid, but letting everything else (http, ftp,
etc) pass through... I have looked through the documentation, and traced
the source... 
 
my real question is this: By now, I assume that many of you have had to
implement handling the signing of attachments, I am just looking for a
good starting point of how you implemented this. I assume I have to
somehow tap into the xmlSecTransformCtxUriExecute function and do my own
file reading... but can't seem to figure out how..
 
any tips/suggestions would be greatly appreciated.
 
I saw a thread in the mail list regarding this, the original answer is
posted at the bottom of this email, I have read the links, and still am
unsure how to proceed on this.
 
~Rob
 
>> Well, probably the best option for you would be option #2: use
special URL protocol
>> in URI attributes like "cid:<attachment id>" and create custom
protocol handlers
>> for "cid". Take a look at LibXML2 IO tutorial:
>>
>>     http://xmlsoft.org/xmlio.html
>>
>>and xmlsec API reference:
>>
>>     http://www.aleksey.com/xmlsec/api/xmlsec-io.html
>>
>>And do not forget to register your protocol handlers in both xmlsec
and libxml2.
>>
>>Aleksey
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