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(JavaScript) Swift Alliance LAU XML Signature
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.)
var 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.
var sbXml = new CkStringBuilder();
success = sbXml.LoadFile("c:/someDir/fileToSign.xml","utf-8");
if (success == false) {
console.log("Failed to load XML file.");
return;
}
// We need to add a "LAU" XML element just before the "</Saa:DataPDU>"
var numReplaced = sbXml.Replace("</Saa:DataPDU>","<LAU xmlns=\"urn:swift:saa:xsd:saa.2.0\"></LAU></Saa:DataPDU>");
var gen = new CkXmlDSigGen();
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) {
console.log(gen.LastErrorText);
return;
}
// Examine the signed XML
console.log(sbXml.GetAsString());
// Save the signed XML to a file.
success = sbXml.WriteFile("c:/someDir/signedFile.xml","utf-8",false);
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