Pascal (Lazarus/Delphi)

Swift Alliance LAU XML Signature

See more XML Digital Signatures Examples

Calculating the LAU for Swift Alliance File Act XML using HMAC SHA256. (The XML signature, also referred to as Local Authentication (LAU), is computed using the algorithm HMAC based on SHA-256.) 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.XmlDSigGen,
  Chilkat.StringBuilder;

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

procedure RunDemo;
var
  success: Boolean;
  sbXml: TStringBuilder;
  numReplaced: Integer;
  gen: TXmlDSigGen;

begin
  success := False;

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

  //  We begin with the following XML:

  //  <?xml version="1.0" encoding="UTF-8"?>
  //  <Saa:DataPDU xmlns:Saa="urn:swift:saa:xsd:saa.2.0" xmlns:Sw="urn:swift:snl:ns.Sw" xmlns:SwInt="urn:swift:snl:ns.SwInt" xmlns:SwGbl="urn:swift:snl:ns.SwGbl" xmlns:SwSec="urn:swift:snl:ns.SwSec">
  //      <Saa:Revision>2.0.6</Saa:Revision>
  //      <Saa:Header>
  //          <Saa:Message>
  //              <Saa:SenderReference>Ref760FA1234</Saa:SenderReference>
  //              <Saa:MessageIdentifier>tsrv.fin.mt7xx.gteesstandbys</Saa:MessageIdentifier>
  //              <Saa:Format>File</Saa:Format>
  //              <Saa:SubFormat>Input</Saa:SubFormat>
  //              <Saa:Sender>
  //                  <Saa:DN>cn=su8,o=ptsqgbbb,o=swift</Saa:DN>
  //                  <Saa:FullName>
  //                      <Saa:X1>PTSQGBBBXXX</Saa:X1>
  //                  </Saa:FullName>
  //              </Saa:Sender>
  //              <Saa:Receiver>
  //                  <Saa:DN>cn=abc,ou=saa,o=xxx,o=swift</Saa:DN>
  //                  <Saa:FullName>
  //                      <Saa:X1>PTSXXXXXXXX</Saa:X1>
  //                      <Saa:X2>saa</Saa:X2>
  //                  </Saa:FullName>
  //              </Saa:Receiver>
  //              <Saa:InterfaceInfo>
  //                  <Saa:UserReference>CRE...</Saa:UserReference>
  //                  <Saa:MessageCreator>ApplicationInterface</Saa:MessageCreator>
  //                  <Saa:MessageContext>Original</Saa:MessageContext>
  //                  <Saa:MessageNature>Financial</Saa:MessageNature>
  //              </Saa:InterfaceInfo>
  //              <Saa:NetworkInfo>
  //                  <Saa:Priority>Normal</Saa:Priority>
  //                  <Saa:IsPossibleDuplicate>true</Saa:IsPossibleDuplicate>
  //                  <Saa:Service>swift.corp.fast!x</Saa:Service>
  //                  <Saa:Network>Application</Saa:Network>
  //                  <Saa:SessionNr>0080</Saa:SessionNr>
  //                  <Saa:SeqNr>000001</Saa:SeqNr>
  //                  <Saa:SWIFTNetNetworkInfo>
  //                      <Saa:RequestType>tsrv.fin.mt7xx.gteesstandbys</Saa:RequestType>
  //                      <Saa:Reference>2f949999-d32e-49eb-9999-9a819b9b9c0d</Saa:Reference>
  //                      <Saa:FileInfo>SwCompression=Zip</Saa:FileInfo>
  //                  </Saa:SWIFTNetNetworkInfo>
  //              </Saa:NetworkInfo>
  //              <Saa:SecurityInfo>
  //                  <Saa:SWIFTNetSecurityInfo>
  //                      <Saa:FileDigestAlgorithm>SHA-256</Saa:FileDigestAlgorithm>
  //                      <Saa:FileDigestValue>9tnnjIgsowPSU+ehm8Rb0J5TvZIvhCYnySzFkpur1aw=</Saa:FileDigestValue>
  //                  </Saa:SWIFTNetSecurityInfo>
  //              </Saa:SecurityInfo>
  //              <Saa:FileLogicalName>Payload.ZIP</Saa:FileLogicalName>
  //              <Saa:ExpiryDateTime>20210712074808</Saa:ExpiryDateTime>
  //          </Saa:Message>
  //      </Saa:Header>
  //      <Saa:Body>Payload.ZIP</Saa:Body>
  //  </Saa:DataPDU>

  //  Load the XML file to be signed.
  sbXml := TStringBuilder.Create;
  success := sbXml.LoadFile('c:/someDir/fileToSign.xml','utf-8');
  if (success = False) then
    begin
      WriteLn('Failed to load XML file.');
      Exit;
    end;

  //  We need to add a "LAU" XML element just before the "</Saa:DataPDU>"
  numReplaced := sbXml.Replace('</Saa:DataPDU>','<LAU xmlns="urn:swift:saa:xsd:saa.2.0"></LAU></Saa:DataPDU>');

  gen := TXmlDSigGen.Create;
  gen.SigLocation := 'Saa:DataPDU|LAU';
  gen.SigLocationMod := 0;
  gen.SigNamespacePrefix := 'ds';
  gen.SigNamespaceUri := 'http://www.w3.org/2000/09/xmldsig#';
  gen.SignedInfoCanonAlg := 'EXCL_C14N';
  gen.SignedInfoDigestMethod := 'sha256';
  gen.Behaviors := 'CompactSignedXml';

  //  Sign the entire document.
  gen.AddSameDocRef('','sha256','EXCL_C14N','','');

  //  Set our HMAC key
  gen.SetHmacKey('Abcdef0123456789Abcdef0123456789','ascii');

  //  Sign the XML:
  success := gen.CreateXmlDSigSb(sbXml);
  if (success = False) then
    begin
      WriteLn(gen.LastErrorText);
      Exit;
    end;

  //  Examine the signed XML
  WriteLn(sbXml.GetAsString());

  //  Save the signed XML to a file.
  success := sbXml.WriteFile('c:/someDir/signedFile.xml','utf-8',False);


  sbXml.Free;
  gen.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.