(C) Create XAdES using Smart Card or USB Token

Demonstrates how to create an XAdES signed XML document using a certificate located on a smartcard or USB token.

Note: This example requires Chilkat v9.5.0.75 or greater. Also, at the time of this writing this example is restricted to the Windows operating system.

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#include <C_CkXml.h>
#include <C_CkXmlDSigGen.h>
#include <C_CkCert.h>
#include <C_CkStringBuilder.h>
#include <C_CkXmlDSig.h>

void ChilkatSample(void)
    {
    HCkXml xmlToSign;
    BOOL success;
    HCkXmlDSigGen gen;
    HCkXml object1;
    HCkCert cert;
    HCkStringBuilder sbXml;
    HCkXmlDSig verifier;
    BOOL verified;

    // ----------------------------------------------------------------------
    // IMPORTANT: This generated example requires Chilkat v9.5.0.75 or later.
    // Contact support@chilkatsoft.com for a pre-release.
    // ----------------------------------------------------------------------

    // Load the XML to be signed.
    xmlToSign = CkXml_Create();
    success = CkXml_LoadXmlFile(xmlToSign,"qa_data/fattura_electronica/docToSign.xml");
    if (success != TRUE) {
        printf("%s\n",CkXml_lastErrorText(xmlToSign));
        CkXml_Dispose(xmlToSign);
        return;
    }

    gen = CkXmlDSigGen_Create();

    CkXmlDSigGen_putSigLocation(gen,"p:FatturaElettronica");
    CkXmlDSigGen_putSigId(gen,"xmldsig-6f4b994a-7191-4bb1-ab3c-17549515b504");
    CkXmlDSigGen_putSigNamespacePrefix(gen,"ds");
    CkXmlDSigGen_putSigNamespaceUri(gen,"http://www.w3.org/2000/09/xmldsig#");
    CkXmlDSigGen_putSigValueId(gen,"xmldsig-6f4b994a-7191-4bb1-ab3c-17549515b504-sigvalue");
    CkXmlDSigGen_putSignedInfoCanonAlg(gen,"C14N");
    CkXmlDSigGen_putSignedInfoDigestMethod(gen,"sha256");

    // Create an Object to be added to the Signature.
    // Note: Chilkat will automatically populate the strings indicated by "TO BE GENERATED BY CHILKAT" with actual/correct values
    // when the XML is signed.
    object1 = CkXml_Create();
    CkXml_putTag(object1,"xades:QualifyingProperties");
    CkXml_AddAttribute(object1,"xmlns:xades","http://uri.etsi.org/01903/v1.3.2#");
    CkXml_AddAttribute(object1,"xmlns:xades141","http://uri.etsi.org/01903/v1.4.1#");
    CkXml_AddAttribute(object1,"Target","#xmldsig-6f4b994a-7191-4bb1-ab3c-17549515b504");
    CkXml_UpdateAttrAt(object1,"xades:SignedProperties",TRUE,"Id","xmldsig-6f4b994a-7191-4bb1-ab3c-17549515b504-signedprops");
    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");

    CkXmlDSigGen_AddObject(gen,"",CkXml_getXml(object1),"","");

    // -------- Reference 1 --------
    CkXmlDSigGen_putKeyInfoId(gen,"xmldsig-6f4b994a-7191-4bb1-ab3c-17549515b504-keyinfo");
    CkXmlDSigGen_AddSameDocRef(gen,"xmldsig-6f4b994a-7191-4bb1-ab3c-17549515b504-keyinfo","sha256","","","");

    // -------- Reference 2 --------
    CkXmlDSigGen_AddSameDocRef(gen,"","sha256","","","");
    CkXmlDSigGen_SetRefIdAttr(gen,"","xmldsig-6f4b994a-7191-4bb1-ab3c-17549515b504-ref0");

    // -------- Reference 3 --------
    CkXmlDSigGen_AddObjectRef(gen,"xmldsig-6f4b994a-7191-4bb1-ab3c-17549515b504-signedprops","sha256","","","http://uri.etsi.org/01903#SignedProperties");

    // ----------------------------------------------------------------
    //  Load a certificate that has been pre-installed on the Windows system
    //  This includes certificates on smartcards and USB tokens
    cert = CkCert_Create();

    //  You may provide the PIN here..
    CkCert_putSmartCardPin(cert,"000000");

    // Load the certificate on the smartcard currently in the reader (or on the USB token).
    // Pass an empty string to allow Chilkat to automatically choose the CSP (Cryptographi Service Provider).
    // See Load Certificate on Smartcard for information about explicitly selecting a particular CSP.
    success = CkCert_LoadFromSmartcard(cert,"");
    if (success != TRUE) {
        printf("%s\n",CkCert_lastErrorText(cert));
        CkXml_Dispose(xmlToSign);
        CkXmlDSigGen_Dispose(gen);
        CkXml_Dispose(object1);
        CkCert_Dispose(cert);
        return;
    }

    CkXmlDSigGen_SetX509Cert(gen,cert,TRUE);
    CkXmlDSigGen_putKeyInfoType(gen,"X509Data");
    CkXmlDSigGen_putX509Type(gen,"Certificate");

    // Load XML to be signed...
    sbXml = CkStringBuilder_Create();
    CkXml_GetXmlSb(xmlToSign,sbXml);

    CkXmlDSigGen_putBehaviors(gen,"IndentedSignature,ForceAddEnvelopedSignatureTransform");

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

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

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

    // ----------------------------------------
    // Verify the signature we just produced...
    verifier = CkXmlDSig_Create();
    success = CkXmlDSig_LoadSignatureSb(verifier,sbXml);
    if (success != TRUE) {
        printf("%s\n",CkXmlDSig_lastErrorText(verifier));
        CkXml_Dispose(xmlToSign);
        CkXmlDSigGen_Dispose(gen);
        CkXml_Dispose(object1);
        CkCert_Dispose(cert);
        CkStringBuilder_Dispose(sbXml);
        CkXmlDSig_Dispose(verifier);
        return;
    }

    verified = CkXmlDSig_VerifySignature(verifier,TRUE);
    if (verified != TRUE) {
        printf("%s\n",CkXmlDSig_lastErrorText(verifier));
        CkXml_Dispose(xmlToSign);
        CkXmlDSigGen_Dispose(gen);
        CkXml_Dispose(object1);
        CkCert_Dispose(cert);
        CkStringBuilder_Dispose(sbXml);
        CkXmlDSig_Dispose(verifier);
        return;
    }

    printf("This signature was successfully verified.\n");


    CkXml_Dispose(xmlToSign);
    CkXmlDSigGen_Dispose(gen);
    CkXml_Dispose(object1);
    CkCert_Dispose(cert);
    CkStringBuilder_Dispose(sbXml);
    CkXmlDSig_Dispose(verifier);

    }