(Unicode C) PKCS11 XML Signature using Certificate and Private Key on Smart Card / USB Token

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Sample code showing how to use PKCS11 to create an XML digital signature with a certificate and private key stored on a smart card or USB token.

Note: This example requires Chilkat v9.5.0.96 or later.

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#include <C_CkPkcs11W.h>
#include <C_CkCertW.h>
#include <C_CkXmlW.h>
#include <C_CkXmlDSigGenW.h>
#include <C_CkStringBuilderW.h>

void ChilkatSample(void)
    {
    HCkPkcs11W pkcs11;
    int userType;
    const wchar_t *pin;
    BOOL success;
    HCkCertW cert;
    HCkXmlW xml;
    HCkXmlDSigGenW gen;
    BOOL bUsePrivateKey;
    HCkStringBuilderW sbXml;

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

    // Note: Chilkat's PKCS11 implementation runs on Windows, Linux, Mac OS X, and other supported operating systems.

    pkcs11 = CkPkcs11W_Create();

    // This example is tested on Windows using a Giesecke and Devrient Sm@rtCafe Expert 3.2 smart card.
    // You will use the DLL (or shared lib) provided by your smart card vendor, or a DLL compatible with your smart card.
    // On Windows, if the DLL is located in C:\Windows\System32, specify only the filename.
    // Otherwise provide the full path.
    CkPkcs11W_putSharedLibPath(pkcs11,L"aetpkss1.dll");

    // Make it an authenticated session by calling Login.
    userType = 1;
    // Make sure to use the correct PIN for your smart card..
    pin = L"0000";

    success = CkPkcs11W_QuickSession(pkcs11,userType,pin);
    if (success == FALSE) {
        wprintf(L"%s\n",CkPkcs11W_lastErrorText(pkcs11));
        CkPkcs11W_Dispose(pkcs11);
        return;
    }

    // Get the certificate (on the smart card) that has a private key.
    cert = CkCertW_Create();
    success = CkPkcs11W_FindCert(pkcs11,L"privateKey",L"",cert);
    if (success == TRUE) {
        wprintf(L"Cert with private key: %s\n",CkCertW_subjectCN(cert));
    }
    else {
        wprintf(L"No certificates having a private key were found.\n");
        success = CkPkcs11W_CloseSession(pkcs11);
        CkPkcs11W_Dispose(pkcs11);
        CkCertW_Dispose(cert);
        return;
    }

    // --------------------------------------------------------------------------
    // At this point, we have the cert to be used for signing.
    // Our XML signing code is the same as for a cert obtained from any other source..

    // First generate the following XML to be signed:
    // Use this online tool to generate code from sample XML: 
    // Generate Code to Create XML

    // <?xml version="1.0" encoding="UTF-8" standalone="no" ?>
    // <SOAP-ENV:Envelope xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/">
    //     <SOAP-ENV:Header>
    //         <wsse:Security xmlns:wsse="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd" SOAP-ENV:mustUnderstand="1"></wsse:Security>
    //     </SOAP-ENV:Header>
    //     <SOAP-ENV:Body xmlns:SOAP-SEC="http://schemas.xmlsoap.org/soap/security/2000-12" SOAP-SEC:id="Body">
    //         <z:FooBar xmlns:z="http://example.com" />
    //     </SOAP-ENV:Body>
    // </SOAP-ENV:Envelope>

    xml = CkXmlW_Create();
    CkXmlW_putTag(xml,L"SOAP-ENV:Envelope");
    CkXmlW_AddAttribute(xml,L"xmlns:SOAP-ENV",L"http://schemas.xmlsoap.org/soap/envelope/");
    CkXmlW_UpdateAttrAt(xml,L"SOAP-ENV:Header|wsse:Security",TRUE,L"xmlns:wsse",L"http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd");
    CkXmlW_UpdateAttrAt(xml,L"SOAP-ENV:Header|wsse:Security",TRUE,L"SOAP-ENV:mustUnderstand",L"1");
    CkXmlW_UpdateAttrAt(xml,L"SOAP-ENV:Body",TRUE,L"xmlns:SOAP-SEC",L"http://schemas.xmlsoap.org/soap/security/2000-12");
    CkXmlW_UpdateAttrAt(xml,L"SOAP-ENV:Body",TRUE,L"SOAP-SEC:id",L"Body");
    CkXmlW_UpdateAttrAt(xml,L"SOAP-ENV:Body|z:FooBar",TRUE,L"xmlns:z",L"http://example.com");

    gen = CkXmlDSigGenW_Create();

    // Indicate where the Signature will be inserted.
    CkXmlDSigGenW_putSigLocation(gen,L"SOAP-ENV:Envelope|SOAP-ENV:Header|wsse:Security");

    // Add a reference to the fragment of the XML to be signed.

    // Note: "Body" refers to the XML element having an "id" equal to "Body", where "id" is case insensitive
    // and where any namespace might qualify the attribute.  In this case, the SOAP-ENV:Body fragment is signed
    // NOT because the tag = "Body", but because it has SOAP-SEC:id="Body"
    CkXmlDSigGenW_AddSameDocRef(gen,L"Body",L"sha1",L"EXCL_C14N",L"",L"");

    // (You can read about the SignedInfoPrefixList in the online reference documentation.  It's optional..)
    CkXmlDSigGenW_putSignedInfoPrefixList(gen,L"wsse SOAP-ENV");

    // Provide the private key for signing via the certificate, and indicate that
    // we want the base64 of the certificate embedded in the KeyInfo.
    CkXmlDSigGenW_putKeyInfoType(gen,L"X509Data");
    CkXmlDSigGenW_putX509Type(gen,L"Certificate");

    bUsePrivateKey = TRUE;
    success = CkXmlDSigGenW_SetX509Cert(gen,cert,bUsePrivateKey);
    if (success != TRUE) {
        wprintf(L"%s\n",CkXmlDSigGenW_lastErrorText(gen));
        success = CkPkcs11W_CloseSession(pkcs11);
        CkPkcs11W_Dispose(pkcs11);
        CkCertW_Dispose(cert);
        CkXmlW_Dispose(xml);
        CkXmlDSigGenW_Dispose(gen);
        return;
    }

    // Everything's specified.  Now create and insert the Signature
    sbXml = CkStringBuilderW_Create();
    CkXmlW_putEmitCompact(xml,TRUE);
    CkXmlW_GetXmlSb(xml,sbXml);

    success = CkXmlDSigGenW_CreateXmlDSigSb(gen,sbXml);
    if (success != TRUE) {
        wprintf(L"%s\n",CkXmlDSigGenW_lastErrorText(gen));
        success = CkPkcs11W_CloseSession(pkcs11);
        CkPkcs11W_Dispose(pkcs11);
        CkCertW_Dispose(cert);
        CkXmlW_Dispose(xml);
        CkXmlDSigGenW_Dispose(gen);
        CkStringBuilderW_Dispose(sbXml);
        return;
    }

    // Examine the XML with the digital signature inserted
    wprintf(L"%s\n",CkStringBuilderW_getAsString(sbXml));

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

    // Revert to an unauthenticated session by calling Logout.
    success = CkPkcs11W_Logout(pkcs11);
    if (success == FALSE) {
        wprintf(L"%s\n",CkPkcs11W_lastErrorText(pkcs11));
        success = CkPkcs11W_CloseSession(pkcs11);
        CkPkcs11W_Dispose(pkcs11);
        CkCertW_Dispose(cert);
        CkXmlW_Dispose(xml);
        CkXmlDSigGenW_Dispose(gen);
        CkStringBuilderW_Dispose(sbXml);
        return;
    }

    // When finished, close the session.
    // It is important to close the session (memory leaks will occur if the session is not properly closed).
    success = CkPkcs11W_CloseSession(pkcs11);
    if (success == FALSE) {
        wprintf(L"%s\n",CkPkcs11W_lastErrorText(pkcs11));
        CkPkcs11W_Dispose(pkcs11);
        CkCertW_Dispose(cert);
        CkXmlW_Dispose(xml);
        CkXmlDSigGenW_Dispose(gen);
        CkStringBuilderW_Dispose(sbXml);
        return;
    }

    wprintf(L"Success.\n");


    CkPkcs11W_Dispose(pkcs11);
    CkCertW_Dispose(cert);
    CkXmlW_Dispose(xml);
    CkXmlDSigGenW_Dispose(gen);
    CkStringBuilderW_Dispose(sbXml);

    }