(Tcl) Canonicalize XML Fragment

Demonstrates how to canonicalize a fragment of an XML document. The fragment is identified by the element having an Id attribute equal to a specified value. (The Id attribute can have any namespace, and the attribute name is case-insensitive (thus "ID", "Id", "id", etc. match).

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load ./chilkat.dll

# This example requires the Chilkat API to have been previously unlocked.
# See Global Unlock Sample for sample code.

set http [new_CkHttp]

set sbXml [new_CkStringBuilder]

set canon [new_CkXmlDSig]

# Use exclusive XML canonicalization.
set canonVersion "EXCL_C14N"
set withComments 0
# The optional inclusive namespaces prefix list if using exclusive canonicalization.
set prefixList ""

set url "https://www.chilkatsoft.com/exampleData/canonicalizeFragmentTest.xml"
set success [CkHttp_QuickGetSb $http $url $sbXml]

# This is the input XML:

# <?xml version="1.0" encoding="UTF-8"?>
# <Signature xmlns="http://www.w3.org/2000/09/xmldsig#">
# <SignedInfo>
#   <CanonicalizationMethod Algorithm="http://www.w3.org/TR/2001/REC-xml-c14n-20010315" />
#   <SignatureMethod Algorithm="http://www.w3.org/2000/09/xmldsig#rsa-sha1" />
#   <Reference URI="#object">
#     <DigestMethod Algorithm="http://www.w3.org/2000/09/xmldsig#sha1" />
#     <DigestValue>OPnpF/ZNLDxJ/I+1F3iHhlmSwgo=</DigestValue>
#   </Reference>
# </SignedInfo>
# <SignatureValue>nihUFQg4mDhLgecvhIcKb9Gz8VRTOlw+adiZOBBXgK4JodEe5aFfCqm8WcRIT8GL
# LXSk8PsUP4//SsKqUBQkpotcAqQAhtz2v9kCWdoUDnAOtFZkd/CnsZ1sge0ndha4
# 0wWDV+nOWyJxkYgicvB8POYtSmldLLepPGMz+J7/Uws=</SignatureValue>
# <KeyInfo>
#   <KeyValue>
#     <RSAKeyValue>
#       <Modulus>4IlzOY3Y9fXoh3Y5f06wBbtTg94Pt6vcfcd1KQ0FLm0S36aGJtTSb6pYKfyX7PqC
#       UQ8wgL6xUJ5GRPEsu9gyz8ZobwfZsGCsvu40CWoT9fcFBZPfXro1Vtlh/xl/yYHm
#       +Gzqh0Bw76xtLHSfLfpVOrmZdwKmSFKMTvNXOFd0V18=</Modulus>
#       <Exponent>AQAB</Exponent>
#     </RSAKeyValue>
#   </KeyValue>
# </KeyInfo>
# <Object Id="object">some text
#   with spaces and CR-LF.</Object>
# </Signature>

# Canonicalize and return the fragment of XML starting at the element where the Id attribute equals "object".
set xmlCanonFrag [CkXmlDSig_canonicalizeFragment $canon [CkStringBuilder_getAsString $sbXml] "object" $canonVersion $prefixList $withComments]
puts "$xmlCanonFrag"

# The output is:
# 
# <Object xmlns="http://www.w3.org/2000/09/xmldsig#" Id="object">some text
#   with spaces and CR-LF.</Object>
# 

delete_CkHttp $http
delete_CkStringBuilder $sbXml
delete_CkXmlDSig $canon