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<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial;mso-ansi-language:EN-GB'>I’m trying to sign an enveloped
<span class=SpellE>XML</span>-document with <span class=SpellE>XMLSec</span>
using a <span class=SpellE>SmartCard</span>. <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial;mso-ansi-language:EN-GB'>In order to do so I’ve
overloaded the default crypto engine with my own <span class=GramE>( handling</span>
Smart Card communication).<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial;mso-ansi-language:EN-GB'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial;mso-ansi-language:EN-GB'>To create the signature template:<o:p></o:p></span></font></p>
<p class=MsoNormal><span class=SpellE><span class=GramE><font size=2
face=Arial><span lang=EN-GB style='font-size:10.0pt;font-family:Arial;
mso-ansi-language:EN-GB'>xmlSecTmplSignatureCreate</span></font></span></span><span
class=GramE><font size=2 face=Arial><span lang=EN-GB style='font-size:10.0pt;
font-family:Arial;mso-ansi-language:EN-GB'>(</span></font></span><font size=2
face=Arial><span lang=EN-GB style='font-size:10.0pt;font-family:Arial;
mso-ansi-language:EN-GB'>doc, xmlSecTransformInclC14NId,
xmlSecTransformRsaSha1Id, NULL);<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial;mso-ansi-language:EN-GB'><o:p> </o:p></span></font></p>
<p class=MsoNormal><span class=GramE><font size=2 face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;mso-ansi-language:EN-GB'>xmlSecTransformRsaSha1Id</span></font></span><font
size=2 face=Arial><span lang=EN-GB style='font-size:10.0pt;font-family:Arial;
mso-ansi-language:EN-GB'> is thus the hashing algorithm for the signature value
calculation (behind the scenes in <span class=SpellE>xmlSecDSigCtxSign</span> ()
). <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial;mso-ansi-language:EN-GB'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial;mso-ansi-language:EN-GB'>In the overloaded<o:p></o:p></span></font></p>
<p class=MsoNormal><span class=SpellE><font size=2 face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;mso-ansi-language:EN-GB'>RSA_private_<span
class=GramE>encrypt</span></span></font></span><span class=GramE><font size=2
face=Arial><span lang=EN-GB style='font-size:10.0pt;font-family:Arial;
mso-ansi-language:EN-GB'>(</span></font></span><span class=SpellE><font size=2
face=Arial><span lang=EN-GB style='font-size:10.0pt;font-family:Arial;
mso-ansi-language:EN-GB'>int</span></font></span><font size=2 face=Arial><span
lang=EN-GB style='font-size:10.0pt;font-family:Arial;mso-ansi-language:EN-GB'> <span
class=SpellE>len</span>, const unsigned char *from,<span style='mso-tab-count:
1'> </span>unsigned char *to, <span class=SpellE>RSA</span> *<span
class=SpellE>rsa</span>, <span class=SpellE>int</span> padding)<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial;mso-ansi-language:EN-GB'><o:p> </o:p></span></font></p>
<p class=MsoNormal><span class=SpellE><font size=2 face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;mso-ansi-language:EN-GB'>Xmlsec</span></font></span><font
size=2 face=Arial><span lang=EN-GB style='font-size:10.0pt;font-family:Arial;
mso-ansi-language:EN-GB'> asks to get 35 bytes encrypted (<span class=SpellE>len</span>=35).
Normally this would be no problem (even if it is much for a hash value), but my
crypto engine only handles up to 20 bytes/160 bits at the moment. The cause of
the limitation is outside of my source code, so it is out of my reach (binary dynamic
library)…<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial;mso-ansi-language:EN-GB'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial;mso-ansi-language:EN-GB'>Any suggestions on how to get
<span class=SpellE>xmlsec</span> to ask for less <span class=GramE>bytes</span>
to be signed?<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial;mso-ansi-language:EN-GB'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial;mso-ansi-language:EN-GB'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face="Courier New"><span lang=EN-GB
style='font-size:10.0pt;font-family:"Courier New";mso-ansi-language:EN-GB;
mso-no-proof:yes'>W | Hårek Ryeng, Senior System Developer<br>
E | Well Diagnostics AS, Forskningsparken, 9291 Tromsø<br>
L | Tel: +47 77 75 76 79 (70), Cell: +47 970 05 022, Fax: +47 77 75 76 99<br>
L | </span></font><span style='mso-no-proof:yes'><a
href="http://www.welldiagnostics.com/"><font size=2 face="Courier New"><span
lang=EN-GB style='font-size:10.0pt;font-family:"Courier New";mso-ansi-language:
EN-GB'>http://www.welldiagnostics.com/</span></font></a><a
href="http://www.welldiagnostics.com/"></a></span><span lang=EN-GB
style='mso-ansi-language:EN-GB'><o:p></o:p></span></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span lang=EN-GB
style='font-size:12.0pt;mso-ansi-language:EN-GB'><o:p> </o:p></span></font></p>
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