(Perl) 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).

Chilkat Perl Downloads Perl Module for Windows, MacOS, Linux, Alpine Linux, Solaris

use chilkat();

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

$http = chilkat::CkHttp->new();
$sbXml = chilkat::CkStringBuilder->new();
$canon = chilkat::CkXmlDSig->new();

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

$url = "https://www.chilkatsoft.com/exampleData/canonicalizeFragmentTest.xml";
$success = $http->QuickGetSb($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".
$xmlCanonFrag = $canon->canonicalizeFragment($sbXml->getAsString(),"object",$canonVersion,$prefixList,$withComments);
print $xmlCanonFrag . "\r\n";

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