Re: [xml] XML-Signature

[Aleksey Sanin <aleksey aleksey com>]

Daniel,

I attached the C14N API I have now. Please let me know if you think I should
change something. Of course, you are abslutelly right about xmlOutputBuffer,
it is the base API. I added two simple envelopes for dumping canonical XML
to memory and save it into a file. I have 7 test cases from W3C documentation
and
I wrote a simple script to do automated testing (I had no chance to look
at the 
libxml test suite yet).
This C14N implementation is only first step and really I want to implement
XML Digital Signature.  Probably it's a good idea to create something like
libxmlsec but I am not sure I have enough time for this. I've not looked
at this closely 
yet but I guess there are a lot of work to do.

Thanks,

Aleksey.




Daniel Veillard wrote:
> On Tue, Feb 26, 2002 at 08:10:49AM -0800, Aleksey Sanin wrote:
> > TJ,
> >
> > Thanks for info. I looked at both packages and it does not seem that 
> > Canonical XML based on libxml should take a lot of time. Almost 
> > everything could be done via "copy/paste" from libxml tree.c file.
> > And it does not look like I will need gdome for this (probably I am 
> > wrong). I am going to implement this in next few days. 
> > Daniel, will you be interested in including XML canonization into 
> > libxml library?
> >     
>
> Definitely. that would be useful for checking the output of the test
> suite and of course the base of XML DSig if someone want to contribute that
> back too.
> If the resulting API is really simple then adding it now will be easy,
> otherwise it may have to wait a bit after the Gnome-2 freeze is over.
> Note that the best it to use an xmlOutputBuffer based API and then
> this can be saved/streamed to any kind of I/O, including user defined one.
>
> Daniel
>
>     
    
    
    
/*
 * http://www.w3.org/TR/2001/REC-xml-c14n-20010315
 * Author: aleksey aleksey com
 */
#ifndef __XML_C14N_H__
#define __XML_C14N_H__    

#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */ 

#include <libxml/tree.h>
#include <libxml/xpath.h> 

typedef struct _xmlC14NCtx *xmlC14NCtxPtr;


/*
 * xmlC14NCtxPtr functions
 */
xmlC14NCtxPtr   xmlC14NNewCtx           (xmlDocPtr doc, 
                                         int with_comments,
                                         xmlNodeSetPtr nodes);
xmlC14NCtxPtr   xmlC14NNewCtxFromFile   (const char* filename,              
                                         int with_comments,
                                         const xmlChar *xpathExp);
xmlC14NCtxPtr   xmlC14NNewCtxWithXPath  (xmlDocPtr doc,
                                         int with_comments,
                                         const xmlChar *xpathExp,
                                         xmlXPathContextPtr xpathCtx);                                   
int             xmlC14NDumpMemory       (xmlC14NCtxPtr ctx,
                                         xmlChar **doc_txt_ptr);
int             xmlC14NSaveFile         (xmlC14NCtxPtr ctx,
                                         const char *filename,
                                         int compression);
int             xmlC14NSaveBuffer       (xmlC14NCtxPtr ctx,
                                        xmlOutputBufferPtr buf);
void            xmlC14NFreeCtx          (xmlC14NCtxPtr ctx);
                                         
#ifdef __cplusplus
}
#endif /* __cplusplus */

#endif /* __XML_C14N_H__ */