React Native

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.) React Native

import { StringBuilder, XmlDSigGen } from '@chilkat/react-native'

async function chilkatExample() {
  // 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.
  const sbXml = new StringBuilder();
  try {
    sbXml.loadFile('c:/someDir/fileToSign.xml', 'utf-8');
  } catch {
    console.log('Failed to load XML file.');
    return;
  }

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

  const gen = new XmlDSigGen();
  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:
  try {
    await gen.createXmlDSigSbAsync(sbXml);
  } catch {
    console.log(gen.lastErrorText);
    return;
  }

  // Examine the signed XML
  console.log(sbXml.getAsString());

  // Save the signed XML to a file.
  sbXml.writeFile('c:/someDir/signedFile.xml', 'utf-8', false);
}