(Objective-C) XAdES using TSA Requiring Client Certificate

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Demonstrates how to create an XMLDSig (XAdES) signed document which includes an EncapsulatedTimestamp using a TSA (TimeStamp Authority) server requiring client certificate authentication. One such TSA is https://www3.postsignum.cz/TSS/TSS_crt/

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#import <CkoStringBuilder.h>
#import <CkoXmlDSigGen.h>
#import <CkoXml.h>
#import <CkoCert.h>
#import <CkoJsonObject.h>
#import <CkoHttp.h>

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

BOOL success = YES;

// Load the XML to be signed.  For example, the XML to be signed might contain something like this:

// <?xml version="1.0" encoding="utf-8"?>
// <TransakcniLogSystemu xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://nsess.public.cz/erms_trans/v_01_01" Id="Signature1">
//   <TransLogInfo>
//     <Identifikator>XYZ ABC</Identifikator>
//     <DatumVzniku>2022-12-20T14:39:02.3625922+01:00</DatumVzniku>
//     <DatumCasOd>2022-12-20T14:26:26.88</DatumCasOd>
//     <DatumCasDo>2022-12-20T14:39:02.287</DatumCasDo>
//     <Software>XYZ</Software>
//     <VerzeSoftware>2.0.19.32</VerzeSoftware>
//   </TransLogInfo>
//   <Udalosti>
//     <Udalost>
//       <Poradi>1</Poradi>
// ...

// Load the XML to be signed from a file.
// (XML can be loaded from other source, such as a string variable.)
CkoStringBuilder *sbXml = [[CkoStringBuilder alloc] init];
success = [sbXml LoadFile: @"xmlToSign.xml" charset: @"utf-8"];

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

gen.SigLocation = @"TransakcniLogSystemu";
gen.SigLocationMod = [NSNumber numberWithInt:0];
gen.SigId = @"SignatureID-Signature1";
gen.SigNamespacePrefix = @"ds";
gen.SigNamespaceUri = @"http://www.w3.org/2000/09/xmldsig#";
gen.SignedInfoCanonAlg = @"C14N";
gen.SignedInfoDigestMethod = @"sha256";

// Set the KeyInfoId before adding references..
gen.KeyInfoId = @"KeyInfoId-Signature-Signature1";

// Create an Object to be added to the Signature.

// Note: Chilkat will automatically fill in the values marked as "TO BE GENERATED BY CHILKAT" at the time of signing.
// The EncapsulatedTimestamp will be automatically generated.

CkoXml *object1 = [[CkoXml alloc] init];
object1.Tag = @"xades:QualifyingProperties";
[object1 AddAttribute: @"Target" value: @"#Signature1"];

[object1 UpdateAttrAt: @"xades:SignedProperties" autoCreate: YES attrName: @"Id" attrValue: @"SignedProperties-Signature-Signature1"];
[object1 UpdateChildContent: @"xades:SignedProperties|xades:SignedSignatureProperties|xades:SigningTime" value: @"TO BE GENERATED BY CHILKAT"];
[object1 UpdateAttrAt: @"xades:SignedProperties|xades:SignedSignatureProperties|xades:SigningCertificate|xades:Cert|xades:CertDigest|ds:DigestMethod" autoCreate: YES attrName: @"Algorithm" attrValue: @"http://www.w3.org/2001/04/xmlenc#sha256"];
[object1 UpdateChildContent: @"xades:SignedProperties|xades:SignedSignatureProperties|xades:SigningCertificate|xades:Cert|xades:CertDigest|ds:DigestValue" value: @"TO BE GENERATED BY CHILKAT"];
[object1 UpdateChildContent: @"xades:SignedProperties|xades:SignedSignatureProperties|xades:SigningCertificate|xades:Cert|xades:IssuerSerial|ds:X509IssuerName" value: @"TO BE GENERATED BY CHILKAT"];
[object1 UpdateChildContent: @"xades:SignedProperties|xades:SignedSignatureProperties|xades:SigningCertificate|xades:Cert|xades:IssuerSerial|ds:X509SerialNumber" value: @"TO BE GENERATED BY CHILKAT"];

// The EncapsulatedTimestamp will be included in the unsigned properties.
[object1 UpdateAttrAt: @"xades:UnsignedProperties|xades:UnsignedSignatureProperties|xades:SignatureTimeStamp" autoCreate: YES attrName: @"Id" attrValue: @"signature-timestamp-5561-8212-3316-5191"];
[object1 UpdateAttrAt: @"xades:UnsignedProperties|xades:UnsignedSignatureProperties|xades:SignatureTimeStamp|ds:CanonicalizationMethod" autoCreate: YES attrName: @"Algorithm" attrValue: @"http://www.w3.org/2001/10/xml-exc-c14n#"];
[object1 UpdateAttrAt: @"xades:UnsignedProperties|xades:UnsignedSignatureProperties|xades:SignatureTimeStamp|xades:EncapsulatedTimeStamp" autoCreate: YES attrName: @"Encoding" attrValue: @"http://uri.etsi.org/01903/v1.2.2#DER"];
[object1 UpdateChildContent: @"xades:UnsignedProperties|xades:UnsignedSignatureProperties|xades:SignatureTimeStamp|xades:EncapsulatedTimeStamp" value: @"TO BE GENERATED BY CHILKAT"];

[gen AddObject: @"XadesObjectId-Signature1" content: [object1 GetXml] mimeType: @"" encoding: @""];

// -------- Reference 1 --------
[gen AddObjectRef: @"SignedProperties-Signature-Signature1" digestMethod: @"sha256" canonMethod: @"EXCL_C14N" prefixList: @"" refType: @"http://uri.etsi.org/01903#SignedProperties"];

// -------- Reference 2 --------
[gen AddSameDocRef: @"KeyInfoId-Signature-Signature1" digestMethod: @"sha256" canonMethod: @"EXCL_C14N" prefixList: @"" refType: @""];
[gen SetRefIdAttr: @"KeyInfoId-Signature-Signature1" value: @"ReferenceKeyInfo"];

// -------- Reference 3 --------
[gen AddSameDocRef: @"" digestMethod: @"sha256" canonMethod: @"EXCL_C14N" prefixList: @"" refType: @""];
[gen SetRefIdAttr: @"" value: @"Reference-Signature1"];

// Provide a certificate + private key. (PFX password is test123)
CkoCert *cert = [[CkoCert alloc] init];
success = [cert LoadPfxFile: @"qa_data/pfx/cert_test123.pfx" password: @"test123"];
if (success != YES) {
    NSLog(@"%@",cert.LastErrorText);
    return;
}

[gen SetX509Cert: cert usePrivateKey: YES];

gen.KeyInfoType = @"X509Data";
gen.X509Type = @"Certificate";

gen.Behaviors = @"IndentedSignature";

// -------------------------------------------------------------------------------------------
// To have the EncapsulatedTimeStamp automatically added... 
// 1) Add the <xades:EncapsulatedTimeStamp Encoding="http://uri.etsi.org/01903/v1.2.2#DER">TO BE GENERATED BY CHILKAT</xades:EncapsulatedTimeStamp>
//    to the unsigned properties.  (This was accomplished in the above code.)
// 2) Specify the TSA URL (Timestamping Authority URL).
//    Here we specify the TSA URL:
// -------------------------------------------------------------------------------------------

CkoJsonObject *jsonTsa = [[CkoJsonObject alloc] init];
[jsonTsa UpdateString: @"timestampToken.tsaUrl" value: @"https://www3.postsignum.cz/TSS/TSS_crt/"];
[jsonTsa UpdateBool: @"timestampToken.requestTsaCert" value: YES];
[gen SetTsa: jsonTsa];

// -------------------------------------------------------------------------------------------
// In this case, the TSA requires client certificate authentication.
// To provide your client certificate, the application will instantiate a Chilkat HTTP object,
// then set it up with a SSL/TLS client certificate, and then tell the XmlDSigGen object
// to use the HTTP object for connections to the TSA server.
// -------------------------------------------------------------------------------------------
CkoHttp *http = [[CkoHttp alloc] init];
success = [http SetSslClientCertPfx: @"/home/bob/pfxFiles/myClientSideCertWithPrivateKey.pfx" pfxPassword: @"pfxPassword"];
if (success != YES) {
    NSLog(@"%@",http.LastErrorText);
    return;
}

// Tell the XmlDSigGen object to use the above HTTP object for TSA communications.
[gen SetHttpObj: http];

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

// -----------------------------------------------

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

NSLog(@"%@",[sbXml GetAsString]);