Visual FoxPro

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). Visual FoxPro

LOCAL lnSuccess
LOCAL loHttp
LOCAL loSbXml
LOCAL loCanon
LOCAL lcCanonVersion
LOCAL lnWithComments
LOCAL lcPrefixList
LOCAL lcUrl
LOCAL lcXmlCanonFrag

lnSuccess = 0

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

loHttp = CreateObject('Chilkat.Http')
loSbXml = CreateObject('Chilkat.StringBuilder')
loCanon = CreateObject('Chilkat.XmlDSig')

* Use exclusive XML canonicalization.
lcCanonVersion = "EXCL_C14N"
lnWithComments = 0
* The optional inclusive namespaces prefix list if using exclusive canonicalization.
lcPrefixList = ""

lcUrl = "https://www.chilkatsoft.com/exampleData/canonicalizeFragmentTest.xml"
lnSuccess = loHttp.QuickGetSb(lcUrl,loSbXml)

* 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".
lcXmlCanonFrag = loCanon.CanonicalizeFragment(loSbXml.GetAsString(),"object",lcCanonVersion,lcPrefixList,lnWithComments)
? lcXmlCanonFrag

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

RELEASE loHttp
RELEASE loSbXml
RELEASE loCanon