(Perl) Alliance Access LAU Sign Message (XML Signature using HMAC-SHA-256)

Demonstrates how to sign XML according to the requirements for Alliance Access LAU (Local Authentication) using HMAC-SHA-256.

Chilkat Perl Downloads Perl Module for Windows, MacOS, Linux, Alpine Linux, Solaris

use chilkat();

# This example requires the Chilkat API to have been previously unlocked.
# See Global Unlock Sample for sample code.

# We begin with this message:

# <?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:SwGbl="urn:swift:snl:ns.SwGbl" xmlns:SwInt="urn:swift:snl:ns:SwInt" xmlns:SwSec="url:swift:snl:ns.SwSec">
#     <Saa:Revision>2.0.7</Saa:Revision>
#     <Saa:Header>
#         <Saa:Message>
# 			<test>blah blah</test>
#         </Saa:Message>
#     </Saa:Header>
#     <Saa:Body>...</Saa:Body>
#     <Saa:LAU>
#     </Saa:LAU>
# </Saa:DataPDU>

# And we want so sign to create this as the result:
# The signed XML we'll create will not be indented and pretty-printed like this.
# Instead, we'll use the "CompactSignedXml" behavior to produce compact single-line 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:SwGbl="urn:swift:snl:ns.SwGbl" xmlns:SwInt="urn:swift:snl:ns:SwInt" xmlns:SwSec="url:swift:snl:ns.SwSec">
#     <Saa:Revision>2.0.7</Saa:Revision>
#     <Saa:Header>
#         <Saa:Message>
# 			<test>blah blah</test>
#         </Saa:Message>
#     </Saa:Header>
#     <Saa:Body>...</Saa:Body>
#     <Saa:LAU>
#         <ds:Signature xmlns:ds="http://www.w3.org/2000/09/xmldsig#">
#             <ds:SignedInfo>
#                 <ds:CanonicalizationMethod Algorithm="http://www.w3.org/2001/10/xml-exc-c14n#"/>
#                 <ds:SignatureMethod Algorithm="http://www.w3.org/2001/04/xmldsig-more#hmac-sha256"/>
#                 <ds:Reference URI="">
#                     <ds:Transforms>
#                         <ds:Transform Algorithm="http://www.w3.org/2000/09/xmldsig#enveloped-signature"/>
#                         <ds:Transform Algorithm="http://www.w3.org/2001/10/xml-exc-c14n#"/>
#                     </ds:Transforms>
#                     <ds:DigestMethod Algorithm="http://www.w3.org/2001/04/xmlenc#sha256"/>
#                     <ds:DigestValue>Y7oScHnYOUQvni/TSzZbDec+HR+mWIFH149GXpwj1Ws=</ds:DigestValue>
#                 </ds:Reference>
#             </ds:SignedInfo>
#             <ds:SignatureValue>6ynF/FcwbPsHrtlj3h2agJigdnvpbO6hOzKSRGzqkw0=</ds:SignatureValue>
#         </ds:Signature>
#     </Saa:LAU>
# </Saa:DataPDU>

$success = 1;

# Create the XML to be signed...

# (The XML does not need to be created this way.  It can be loaded from a file or a string.)
# Also, use this online tool to generate code from sample XML: 
# Generate Code to Create XML

$xmlToSign = chilkat::CkXml->new();
$xmlToSign->put_Tag("Saa:DataPDU");
$xmlToSign->AddAttribute("xmlns:Saa","urn:swift:saa:xsd:saa.2.0");
$xmlToSign->AddAttribute("xmlns:Sw","urn:swift:snl:ns.Sw");
$xmlToSign->AddAttribute("xmlns:SwGbl","urn:swift:snl:ns.SwGbl");
$xmlToSign->AddAttribute("xmlns:SwInt","urn:swift:snl:ns:SwInt");
$xmlToSign->AddAttribute("xmlns:SwSec","url:swift:snl:ns.SwSec");
$xmlToSign->UpdateChildContent("Saa:Revision","2.0.7");
$xmlToSign->UpdateChildContent("Saa:Header|Saa:Message|test","blah blah");
$xmlToSign->UpdateChildContent("Saa:Body","...");
$xmlToSign->UpdateChildContent("Saa:LAU","");

$gen = chilkat::CkXmlDSigGen->new();

$gen->put_SigLocation("Saa:DataPDU|Saa:LAU");
$gen->put_SigLocationMod(0);
$gen->put_SigNamespacePrefix("ds");
$gen->put_SigNamespaceUri("http://www.w3.org/2000/09/xmldsig#");
$gen->put_SignedInfoCanonAlg("EXCL_C14N");
$gen->put_SignedInfoDigestMethod("sha256");

# You may alternatively choose "IndentedSignature" instead of "CompactSignedXml"
$gen->put_Behaviors("CompactSignedXml");

$gen->AddSameDocRef("","sha256","EXCL_C14N","","");

# Specify the HMAC key.
# For example, if the HMAC key is to be the us-ascii bytes of the string "secret",
# the HMAC key can be set in any of the following ways (and also more ways not shown here..)
$gen->SetHmacKey("secret","ascii");
# or
$gen->SetHmacKey("c2VjcmV0","base64");
# or
$gen->SetHmacKey("736563726574","hex");

# Sign the XML..
$sbXml = chilkat::CkStringBuilder->new();
$xmlToSign->GetXmlSb($sbXml);
$success = $gen->CreateXmlDSigSb($sbXml);
if ($success != 1) {
    print $gen->lastErrorText() . "\r\n";
    exit;
}

# Save the signed XML to a file.
$success = $sbXml->WriteFile("qa_output/signedXml.xml","utf-8",0);

# Show the signed XML.
print $sbXml->getAsString() . "\r\n";