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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.)Chilkat Xbase++ Downloads
LOCAL nSuccess
LOCAL oSbXml
LOCAL nNumReplaced
LOCAL oGen
nSuccess := 0
// 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.
oSbXml := CreateObject("Chilkat.StringBuilder")
nSuccess := oSbXml:LoadFile("c:/someDir/fileToSign.xml", "utf-8")
IF (nSuccess == 0)
? "Failed to load XML file."
oSbXml:destroy()
RETURN
ENDIF
// We need to add a "LAU" XML element just before the "</Saa:DataPDU>"
nNumReplaced := oSbXml:Replace("</Saa:DataPDU>", '<LAU xmlns="urn:swift:saa:xsd:saa.2.0"></LAU></Saa:DataPDU>')
oGen := CreateObject("Chilkat.XmlDSigGen")
oGen:SigLocation := "Saa:DataPDU|LAU"
oGen:SigLocationMod := 0
oGen:SigNamespacePrefix := "ds"
oGen:SigNamespaceUri := "http://www.w3.org/2000/09/xmldsig#"
oGen:SignedInfoCanonAlg := "EXCL_C14N"
oGen:SignedInfoDigestMethod := "sha256"
oGen:Behaviors := "CompactSignedXml"
// Sign the entire document.
oGen:AddSameDocRef("", "sha256", "EXCL_C14N", "", "")
// Set our HMAC key
oGen:SetHmacKey("Abcdef0123456789Abcdef0123456789", "ascii")
// Sign the XML:
nSuccess := oGen:CreateXmlDSigSb(oSbXml)
IF (nSuccess == 0)
? oGen:LastErrorText
oSbXml:destroy()
oGen:destroy()
RETURN
ENDIF
// Examine the signed XML
? oSbXml:GetAsString()
// Save the signed XML to a file.
nSuccess := oSbXml:WriteFile("c:/someDir/signedFile.xml", "utf-8", 0)
oSbXml:destroy()
oGen:destroy()