B4X
B4X
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 B4X Downloads
Dim success As Boolean = 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.
Dim sbXml As ChilkatStringBuilder
sbXml.Initialize
success = sbXml.LoadFile("c:/someDir/fileToSign.xml", "utf-8")
If success = False Then
Log("Failed to load XML file.")
Return
End If
' We need to add a "LAU" XML element just before the "</Saa:DataPDU>"
Dim numReplaced As Int = sbXml.Replace("</Saa:DataPDU>", "<LAU xmlns=" & Chr(34) & "urn:swift:saa:xsd:saa.2.0" & Chr(34) & "></LAU></Saa:DataPDU>")
Dim gen As ChilkatXmlDSigGen
gen.Initialize("gen")
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
Log(gen.LastErrorText)
Return
End If
' Examine the signed XML
Log(sbXml.GetAsString)
' Save the signed XML to a file.
success = sbXml.WriteFile("c:/someDir/signedFile.xml", "utf-8", False)