Pascal (Lazarus/Delphi)

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). Pascal (Lazarus/Delphi)

program ChilkatDemo;

// Demonstrates using the Chilkat Pascal wrapper via the C bridge DLL.
// Builds as a console application under Lazarus (FPC) or Delphi.

{$IFDEF FPC}
  {$MODE DELPHI}
{$ENDIF}
{$APPTYPE CONSOLE}

uses
  {$IFDEF UNIX}
  cthreads,
  {$ENDIF}
  SysUtils,
  CkDllLoader,
  Chilkat.Http,
  Chilkat.StringBuilder,
  Chilkat.XmlDSig;

// ---------------------------------------------------------------------------

procedure RunDemo;
var
  success: Boolean;
  http: THttp;
  sbXml: TStringBuilder;
  canon: TXmlDSig;
  canonVersion: string;
  withComments: Boolean;
  prefixList: string;
  url: string;
  xmlCanonFrag: string;

begin
  success := False;

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

  http := THttp.Create;
  sbXml := TStringBuilder.Create;
  canon := TXmlDSig.Create;

  //  Use exclusive XML canonicalization.
  canonVersion := 'EXCL_C14N';
  withComments := False;
  //  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);
  WriteLn(xmlCanonFrag);

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


  http.Free;
  sbXml.Free;
  canon.Free;

end;

// ---------------------------------------------------------------------------

begin

  try
    RunDemo;
  except
    on E: Exception do
      WriteLn('Unhandled exception: ', E.ClassName, ': ', E.Message);
  end;

  WriteLn;
  {$IFDEF MSWINDOWS}
  WriteLn('Press Enter to exit...');
  ReadLn;
  {$ENDIF}
end.