(C) XAdES using TSA Requiring Client Certificate

See more XML Digital Signatures Examples

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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#include <C_CkStringBuilder.h>
#include <C_CkXmlDSigGen.h>
#include <C_CkXml.h>
#include <C_CkCert.h>
#include <C_CkJsonObject.h>
#include <C_CkHttp.h>

void ChilkatSample(void)
    {
    BOOL success;
    HCkStringBuilder sbXml;
    HCkXmlDSigGen gen;
    HCkXml object1;
    HCkCert cert;
    HCkJsonObject jsonTsa;
    HCkHttp http;

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

    success = TRUE;

    // 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.)
    sbXml = CkStringBuilder_Create();
    success = CkStringBuilder_LoadFile(sbXml,"xmlToSign.xml","utf-8");

    gen = CkXmlDSigGen_Create();

    CkXmlDSigGen_putSigLocation(gen,"TransakcniLogSystemu");
    CkXmlDSigGen_putSigLocationMod(gen,0);
    CkXmlDSigGen_putSigId(gen,"SignatureID-Signature1");
    CkXmlDSigGen_putSigNamespacePrefix(gen,"ds");
    CkXmlDSigGen_putSigNamespaceUri(gen,"http://www.w3.org/2000/09/xmldsig#");
    CkXmlDSigGen_putSignedInfoCanonAlg(gen,"C14N");
    CkXmlDSigGen_putSignedInfoDigestMethod(gen,"sha256");

    // Set the KeyInfoId before adding references..
    CkXmlDSigGen_putKeyInfoId(gen,"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.

    object1 = CkXml_Create();
    CkXml_putTag(object1,"xades:QualifyingProperties");
    CkXml_AddAttribute(object1,"xmlns:xades","http://uri.etsi.org/01903/v1.3.2#");
    CkXml_AddAttribute(object1,"Target","#Signature1");

    CkXml_UpdateAttrAt(object1,"xades:SignedProperties",TRUE,"Id","SignedProperties-Signature-Signature1");
    CkXml_UpdateChildContent(object1,"xades:SignedProperties|xades:SignedSignatureProperties|xades:SigningTime","TO BE GENERATED BY CHILKAT");
    CkXml_UpdateAttrAt(object1,"xades:SignedProperties|xades:SignedSignatureProperties|xades:SigningCertificateV2|xades:Cert|xades:CertDigest|ds:DigestMethod",TRUE,"Algorithm","http://www.w3.org/2001/04/xmlenc#sha256");
    CkXml_UpdateChildContent(object1,"xades:SignedProperties|xades:SignedSignatureProperties|xades:SigningCertificateV2|xades:Cert|xades:CertDigest|ds:DigestValue","TO BE GENERATED BY CHILKAT");
    CkXml_UpdateChildContent(object1,"xades:SignedProperties|xades:SignedSignatureProperties|xades:SigningCertificateV2|xades:Cert|xades:IssuerSerialV2","TO BE GENERATED BY CHILKAT");

    // The EncapsulatedTimestamp will be included in the unsigned properties.
    CkXml_UpdateAttrAt(object1,"xades:UnsignedProperties|xades:UnsignedSignatureProperties|xades:SignatureTimeStamp",TRUE,"Id","signature-timestamp-5561-8212-3316-5191");
    CkXml_UpdateAttrAt(object1,"xades:UnsignedProperties|xades:UnsignedSignatureProperties|xades:SignatureTimeStamp|ds:CanonicalizationMethod",TRUE,"Algorithm","http://www.w3.org/2001/10/xml-exc-c14n#");
    CkXml_UpdateAttrAt(object1,"xades:UnsignedProperties|xades:UnsignedSignatureProperties|xades:SignatureTimeStamp|xades:EncapsulatedTimeStamp",TRUE,"Encoding","http://uri.etsi.org/01903/v1.2.2#DER");
    CkXml_UpdateChildContent(object1,"xades:UnsignedProperties|xades:UnsignedSignatureProperties|xades:SignatureTimeStamp|xades:EncapsulatedTimeStamp","TO BE GENERATED BY CHILKAT");

    CkXmlDSigGen_AddObject(gen,"XadesObjectId-Signature1",CkXml_getXml(object1),"","");

    // -------- Reference 1 --------
    CkXmlDSigGen_AddObjectRef(gen,"SignedProperties-Signature-Signature1","sha256","EXCL_C14N","","http://uri.etsi.org/01903#SignedProperties");

    // -------- Reference 2 --------
    CkXmlDSigGen_AddSameDocRef(gen,"KeyInfoId-Signature-Signature1","sha256","EXCL_C14N","","");
    CkXmlDSigGen_SetRefIdAttr(gen,"KeyInfoId-Signature-Signature1","ReferenceKeyInfo");

    // -------- Reference 3 --------
    CkXmlDSigGen_AddSameDocRef(gen,"","sha256","EXCL_C14N","","");
    CkXmlDSigGen_SetRefIdAttr(gen,"","Reference-Signature1");

    // Provide a certificate + private key. (PFX password is test123)
    cert = CkCert_Create();
    success = CkCert_LoadPfxFile(cert,"qa_data/pfx/cert_test123.pfx","test123");
    if (success != TRUE) {
        printf("%s\n",CkCert_lastErrorText(cert));
        CkStringBuilder_Dispose(sbXml);
        CkXmlDSigGen_Dispose(gen);
        CkXml_Dispose(object1);
        CkCert_Dispose(cert);
        return;
    }

    CkXmlDSigGen_SetX509Cert(gen,cert,TRUE);

    CkXmlDSigGen_putKeyInfoType(gen,"X509Data");
    CkXmlDSigGen_putX509Type(gen,"Certificate");

    CkXmlDSigGen_putBehaviors(gen,"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:
    // -------------------------------------------------------------------------------------------

    jsonTsa = CkJsonObject_Create();
    CkJsonObject_UpdateString(jsonTsa,"timestampToken.tsaUrl","https://www3.postsignum.cz/TSS/TSS_crt/");
    CkJsonObject_UpdateBool(jsonTsa,"timestampToken.requestTsaCert",TRUE);
    CkXmlDSigGen_SetTsa(gen,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.
    // -------------------------------------------------------------------------------------------
    http = CkHttp_Create();
    success = CkHttp_SetSslClientCertPfx(http,"/home/bob/pfxFiles/myClientSideCertWithPrivateKey.pfx","pfxPassword");
    if (success != TRUE) {
        printf("%s\n",CkHttp_lastErrorText(http));
        CkStringBuilder_Dispose(sbXml);
        CkXmlDSigGen_Dispose(gen);
        CkXml_Dispose(object1);
        CkCert_Dispose(cert);
        CkJsonObject_Dispose(jsonTsa);
        CkHttp_Dispose(http);
        return;
    }

    // Tell the XmlDSigGen object to use the above HTTP object for TSA communications.
    CkXmlDSigGen_SetHttpObj(gen,http);

    // Sign the XML...
    success = CkXmlDSigGen_CreateXmlDSigSb(gen,sbXml);
    if (success != TRUE) {
        printf("%s\n",CkXmlDSigGen_lastErrorText(gen));
        CkStringBuilder_Dispose(sbXml);
        CkXmlDSigGen_Dispose(gen);
        CkXml_Dispose(object1);
        CkCert_Dispose(cert);
        CkJsonObject_Dispose(jsonTsa);
        CkHttp_Dispose(http);
        return;
    }

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

    // Save the signed XML to a file.
    success = CkStringBuilder_WriteFile(sbXml,"c:/temp/qa_output/signedXml.xml","utf-8",FALSE);

    printf("%s\n",CkStringBuilder_getAsString(sbXml));


    CkStringBuilder_Dispose(sbXml);
    CkXmlDSigGen_Dispose(gen);
    CkXml_Dispose(object1);
    CkCert_Dispose(cert);
    CkJsonObject_Dispose(jsonTsa);
    CkHttp_Dispose(http);

    }