Objective-C

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

See more XML Digital Signatures Examples

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

#import <CkoXml.h>
#import <CkoXmlDSigGen.h>
#import <CkoStringBuilder.h>

BOOL success = NO;

// 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 = YES;

// 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

CkoXml *xmlToSign = [[CkoXml alloc] init];
xmlToSign.Tag = @"Saa:DataPDU";
[xmlToSign AddAttribute: @"xmlns:Saa" value: @"urn:swift:saa:xsd:saa.2.0"];
[xmlToSign AddAttribute: @"xmlns:Sw" value: @"urn:swift:snl:ns.Sw"];
[xmlToSign AddAttribute: @"xmlns:SwGbl" value: @"urn:swift:snl:ns.SwGbl"];
[xmlToSign AddAttribute: @"xmlns:SwInt" value: @"urn:swift:snl:ns:SwInt"];
[xmlToSign AddAttribute: @"xmlns:SwSec" value: @"url:swift:snl:ns.SwSec"];
[xmlToSign UpdateChildContent: @"Saa:Revision" value: @"2.0.7"];
[xmlToSign UpdateChildContent: @"Saa:Header|Saa:Message|test" value: @"blah blah"];
[xmlToSign UpdateChildContent: @"Saa:Body" value: @"..."];
[xmlToSign UpdateChildContent: @"Saa:LAU" value: @""];

CkoXmlDSigGen *gen = [[CkoXmlDSigGen alloc] init];

gen.SigLocation = @"Saa:DataPDU|Saa:LAU";
gen.SigLocationMod = [NSNumber numberWithInt:0];
gen.SigNamespacePrefix = @"ds";
gen.SigNamespaceUri = @"http://www.w3.org/2000/09/xmldsig#";
gen.SignedInfoCanonAlg = @"EXCL_C14N";
gen.SignedInfoDigestMethod = @"sha256";

// You may alternatively choose "IndentedSignature" instead of "CompactSignedXml"
gen.Behaviors = @"CompactSignedXml";

[gen AddSameDocRef: @"" digestMethod: @"sha256" canonMethod: @"EXCL_C14N" prefixList: @"" refType: @""];

// 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" encoding: @"ascii"];
// or
[gen SetHmacKey: @"c2VjcmV0" encoding: @"base64"];
// or
[gen SetHmacKey: @"736563726574" encoding: @"hex"];

// Sign the XML..
CkoStringBuilder *sbXml = [[CkoStringBuilder alloc] init];
[xmlToSign GetXmlSb: sbXml];
success = [gen CreateXmlDSigSb: sbXml];
if (success != YES) {
    NSLog(@"%@",gen.LastErrorText);
    return;
}

// Save the signed XML to a file.
success = [sbXml WriteFile: @"qa_output/signedXml.xml" charset: @"utf-8" emitBom: NO];

// Show the signed XML.
NSLog(@"%@",[sbXml GetAsString]);