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Hi,
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<div class="">Are you sure that the Interest you receive carries a signature in the first place?</div>
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<div class="">Thanks,</div>
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<div>Spyridon (Spyros) Mastorakis<br class="">
Assistant Professor<br class="">
Computer Science Department<br class="">
University of Nebraska, Omaha<br class="">
Peter Kiewit Institute Room 175A<br class="">
<a href="https://sites.google.com/site/spyridonmastorakis" class="">https://sites.google.com/site/spyridonmastorakis</a><br class="">
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<div class="">On Jan 15, 2020, at 3:45 AM, Anantha krishnan saji via ndnSIM <<a href="mailto:ndnsim@lists.cs.ucla.edu" class="">ndnsim@lists.cs.ucla.edu</a>> wrote:</div>
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<div class="">Hi all,</div>
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<div class="">I want to use Signature in interest packets. Since I could not find InterestSignature class in ndnSim (<a href="https://urldefense.proofpoint.com/v2/url?u=http-3A__named-2Ddata.net_doc_NDN-2Dpacket-2Dspec_current_signature.html-23interest-2Dsignature&d=DwMFaQ&c=Cu5g146wZdoqVuKpTNsYHeFX_rg6kWhlkLF8Eft-wwo&r=eI5Bh74ovG-uIXQ5ksQETSPgRFzmJXjIZXneCqw580E&m=aNexH4sM2MOP3WZq3KHw4FakjxdFte_otC2AV9FLzK4&s=HBLrQsPQMcXUXUG86_9LXf5FQ4iH9wS7TifZmRKi4fM&e=" class="">http://named-data.net/doc/NDN-packet-spec/current/signature.html#interest-signature</a>),
I used DataSignature (ndn-cxx/signature.cpp). I made the necessary changes in encoding and decoding of interest packet. I am using </div>
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<div class=""><span style="font-family:verdana,sans-serif" class=""><b class="">Block block = ::ndn::makeNonNegativeIntegerBlock(::ndn::tlv::SignatureValue, m_signature);
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<div class=""><span style="font-family:verdana,sans-serif" class=""><b class="">signature.setValue(block);</b></span></div>
<div class="">to create a signaturevalue block and</div>
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<span style="font-family:verdana,sans-serif" class=""><b class="">Block signatureValueBlock = interest->getSignature().getValue();<br class="">
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<div class=""><span style="font-family:verdana,sans-serif" class=""><b class="">signatureValueBlock.parse();</b></span></div>
<div class="">to parse the block on producer side. I am able to parse signatureInfo similarly. But the problem is signatureValue is not getting parsed. I am getting the following error:</div>
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<div class=""><span style="font-family:verdana,sans-serif" class=""><b class="">TLV-LENGTH of sub-element of type 252 exceeds TLV-VALUE boundary of parent block</b></span></div>
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</b></span></div>
When the default signatureValue of 0 is used, the error becomes
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<div class=""><span style="font-family:verdana,sans-serif" class=""><b class="">Empty buffer during TLV parsing</b></span></div>
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</b></span></div>
<div class=""><span style="font-family:verdana,sans-serif" class=""><font face="arial,sans-serif" class="">I would like to know whether there are any additional steps involved in parsing signature other than</font></span></div>
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<li class=""><span style="font-family:verdana,sans-serif" class=""><font face="arial,sans-serif" class="">retrieve the signatureValue block.<br class="">
</font></span></li><li class="">parse the retrieved block.</li><li class="">Access the tlv using Block::elements();</li></ol>
<div class="">I have used the same steps in multiple places in my code to create and parse blocks and all that is working fine. Is parsing Signature any different?</div>
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<div class="">Thanks and regards,</div>
<div class="">Ananthakrishnan S</div>
<div class="">NITK Surathkal<br class="">
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