[xmlsec] Support for really large XML documents

Aleksey Sanin aleksey at aleksey.com
Wed May 23 12:28:11 PDT 2012

The error indicates that we can't allocate output buffer correctly. If
I would guess, then I would see if the "size" parameter is treated as
negative number when it exceeds 2G.

Try to change include/xmlsec/xmlsec.h and change the xmlSecSize to be
a typedef to size_t all the time (dont' forget to recompile xmlsec
after this change).


On 5/23/12 8:28 AM, Vit Zikmund wrote:
> Hello,
> we are trying to use the XMLSec utility to verify documents signed with
> our own application and probably have hit a limit of the document size,
> that XMLSec is able to process.
> The simplest question is: Does XMLSec support handling large
> documents/files? Is is about to? For large I mean 2 gigabytes and more.
> I can verify a document of 1GB, but little over 2GB returns an error:
> func=xmlSecTransformC14NPushXml:file=c14n.c:line=279:obj=c14n:subj=xmlOutputBufferClose:error=5:libxml2
> library function failed:
> func=xmlSecTransformDefaultPushXml:file=transforms.c:line=2417:obj=enveloped-signature:subj=xmlSecTransformPushXml:error=1:xmlsec
> library function failed:
> func=xmlSecTransformCtxXmlExecute:file=transforms.c:line=1236:obj=unknown:subj=xmlSecTransformPushXml:error=1:xmlsec
> library function failed:transform=enveloped-signature
> func=xmlSecTransformCtxExecute:file=transforms.c:line=1296:obj=unknown:subj=xmlSecTransformCtxXmlExecute:error=1:xmlsec
> library function failed:
> func=xmlSecDSigReferenceCtxProcessNode:file=xmldsig.c:line=1571:obj=unknown:subj=xmlSecTransformCtxExecute:error=1:xmlsec
> library function failed:
> func=xmlSecDSigCtxProcessSignedInfoNode:file=xmldsig.c:line=804:obj=unknown:subj=xmlSecDSigReferenceCtxProcessNode:error=1:xmlsec
> library function failed:node=Reference
> func=xmlSecDSigCtxProcessSignatureNode:file=xmldsig.c:line=547:obj=unknown:subj=xmlSecDSigCtxProcessSignedInfoNode:error=1:xmlsec
> library function failed:
> func=xmlSecDSigCtxVerify:file=xmldsig.c:line=366:obj=unknown:subj=xmlSecDSigCtxSigantureProcessNode:error=1:xmlsec
> library function failed:
> Error: signature failed
> If I interpret it right, it seems like it's a problem of the underlying
> libxm2 library, but the question still stands. I have built the tool for
> x86_64 from the latest released source and used the latest libxml2 and
> libxslt sources as well.
> Thank you very much in advance.
> Vit Zikmund
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