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Visual Basic 6.0 Examples

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(Visual Basic 6.0) 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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ActiveX for 32-bit and 64-bit Windows

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

Dim http As New ChilkatHttp
Dim sbXml As New ChilkatStringBuilder
Dim canon As New ChilkatXmlDSig

'  Use exclusive XML canonicalization.
Dim canonVersion As String
canonVersion = "EXCL_C14N"
Dim withComments As Long
withComments = 0
'  The optional inclusive namespaces prefix list if using exclusive canonicalization.
Dim prefixList As String
prefixList = ""

Dim url As String
url = "https://www.chilkatsoft.com/exampleData/canonicalizeFragmentTest.xml"
Dim success As Long
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".
Dim xmlCanonFrag As String
xmlCanonFrag = canon.CanonicalizeFragment(sbXml.GetAsString(),"object",canonVersion,prefixList,withComments)
Debug.Print xmlCanonFrag

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

 

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