Zig

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.) Zig

const std = @import("std");
const chilkat = @import("chilkat");

pub fn main(init: std.process.Init) !void {
    const alloc = init.arena.allocator();

    // 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 sb_xml = try chilkat.StringBuilder.init();
    defer sb_xml.deinit();
    sb_xml.loadFile("c:/someDir/fileToSign.xml", "utf-8") catch {
        std.debug.print("Failed to load XML file.\n", .{});
        return;
    };

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

    const gen = try chilkat.XmlDSigGen.init();
    defer gen.deinit();
    gen.setSigLocation("Saa:DataPDU|LAU");
    gen.setSigLocationMod(0);
    gen.setSigNamespacePrefix("ds");
    gen.setSigNamespaceUri("http://www.w3.org/2000/09/xmldsig#");
    gen.setSignedInfoCanonAlg("EXCL_C14N");
    gen.setSignedInfoDigestMethod("sha256");
    gen.setBehaviors("CompactSignedXml");

    // Sign the entire document.
    gen.addSameDocRef("", "sha256", "EXCL_C14N", "", "") catch {};

    // Set our HMAC key
    gen.setHmacKey("Abcdef0123456789Abcdef0123456789", "ascii") catch {};

    // Sign the XML:
    gen.createXmlDSigSb(sb_xml) catch {
        std.debug.print("{s}\n", .{try gen.getLastErrorText(alloc)});
        return;
    };

    // Examine the signed XML
    std.debug.print("{s}\n", .{try sb_xml.getAsString(alloc)});

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