Xbase++

Canonicalize XML Fragment

See more XML Digital Signatures Examples

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). Xbase++

LOCAL nSuccess
LOCAL oHttp
LOCAL oSbXml
LOCAL oCanon
LOCAL cCanonVersion
LOCAL nWithComments
LOCAL cPrefixList
LOCAL cUrl
LOCAL cXmlCanonFrag

nSuccess := 0

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

oHttp := CreateObject("Chilkat.Http")
oSbXml := CreateObject("Chilkat.StringBuilder")
oCanon := CreateObject("Chilkat.XmlDSig")

//  Use exclusive XML canonicalization.
cCanonVersion := "EXCL_C14N"
nWithComments := 0
//  The optional inclusive namespaces prefix list if using exclusive canonicalization.
cPrefixList := ""

cUrl := "https://www.chilkatsoft.com/exampleData/canonicalizeFragmentTest.xml"
nSuccess := oHttp:QuickGetSb(cUrl, oSbXml)

//  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".
cXmlCanonFrag := oCanon:CanonicalizeFragment(oSbXml:GetAsString(), "object", cCanonVersion, cPrefixList, nWithComments)
? cXmlCanonFrag

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

oHttp:destroy()
oSbXml:destroy()
oCanon:destroy()