Automate Extended Validation (EV) code signing

问题:

We recently purchased a DigiCert EV code signing certificate. We are able to sign .exe files using signtool.exe. However, every time we sign a file, it prompts for the SafeNet eToken password.

How can we automate this process, without user intervention, by storing/caching the password somewhere?

回答1:

There is no way to bypass the login dialog AFAIK, but what you can do is configure the SafeNet Authentication Client so it only asks it once per login session.

I quote the SAC doc (found once installed in \ProgramFiles\SafeNet\Authentication\SAC\SACHelp.chm, chapter 'Client Settings', 'Enabling Client Logon') here:

When single logon is enabled, users can access multiple applications with only one request for the Token Password during each computer session. This alleviates the need for the user to log on to each application separately.

To enable this feature which is disabled by default, go to SAC advanced settings, and check the "enable single logon" box:

Restart your computer, and it should now only prompt for the token password once. In our case, we have more than 200 binaries to sign per each build, so this is a total must.

Otherwise, here is a small C# console sample code (equivalent to m1st0 one) that allows you to respond automatically to logon dialogs (probably needs to run as admin):

    static void SatisfyEverySafeNetTokenPasswordRequest(string password)
    {
        int count = 0;
        Automation.AddAutomationEventHandler(WindowPattern.WindowOpenedEvent, AutomationElement.RootElement, TreeScope.Children, (sender, e) =>
        {
            var element = sender as AutomationElement;
            if (element.Current.Name == "Token Logon")
            {
                WindowPattern pattern = (WindowPattern)element.GetCurrentPattern(WindowPattern.Pattern);
                pattern.WaitForInputIdle(10000);
                var edit = element.FindFirst(TreeScope.Descendants, new AndCondition(
                    new PropertyCondition(AutomationElement.ControlTypeProperty, ControlType.Edit),
                    new PropertyCondition(AutomationElement.NameProperty, "Token Password:")));

                var ok = element.FindFirst(TreeScope.Descendants, new AndCondition(
                    new PropertyCondition(AutomationElement.ControlTypeProperty, ControlType.Button),
                    new PropertyCondition(AutomationElement.NameProperty, "OK")));

                if (edit != null && ok != null)
                {
                    count++;
                    ValuePattern vp = (ValuePattern)edit.GetCurrentPattern(ValuePattern.Pattern);
                    vp.SetValue(password);
                    Console.WriteLine("SafeNet window (count: " + count + " window(s)) detected. Setting password...");

                    InvokePattern ip = (InvokePattern)ok.GetCurrentPattern(InvokePattern.Pattern);
                    ip.Invoke();
                }
                else
                {
                    Console.WriteLine("SafeNet window detected but not with edit and button...");
                }
            }
        });

        do
        {
            // press Q to quit...
            ConsoleKeyInfo k = Console.ReadKey(true);
            if (k.Key == ConsoleKey.Q)
                break;
        }
        while (true);
        Automation.RemoveAllEventHandlers();
    }

回答2:

I'm made beta tool which will help to automate build process.

It's Client-Server windows application. You can start server on computer where EV token inserted. Enter password for token on server-side application startup. After this you can sign files remotely. Client side application fully replaces signtool.exe so you can use existing build scripts.

Source code located here: https://github.com/SirAlex/RemoteSignTool

Edit: We successfully used this tool for code signing last half-year 24x7 on our Build server. All works fine.

回答3:

Expanding on this answer, this can be automated using CryptAcquireContext and CryptSetProvParam to enter the token PIN programmatically and CryptUIWizDigitalSign to perform the signing programmatically. I created a console app (code below) that takes as input the certificate file (exported by right clicking the certificate in SafeNet Authentication Client and selecting "Export..."), the private key container name (found in SafeNet Authentication Client), the token PIN, timestamp URL, and the path of the file to sign. This console app worked when called by the TeamCity build agent where the USB token was connected.

Example Usage:
etokensign.exe c:\CodeSigning.cert CONTAINER PIN http://timestamp.digicert.com C:\program.exe

Code:

#include <windows.h>
#include <cryptuiapi.h>
#include <iostream>
#include <string>

const std::wstring ETOKEN_BASE_CRYPT_PROV_NAME = L"eToken Base Cryptographic Provider";

std::string utf16_to_utf8(const std::wstring& str)
{
    if (str.empty())
    {
        return "";
    }

    auto utf8len = ::WideCharToMultiByte(CP_UTF8, 0, str.data(), str.size(), NULL, 0, NULL, NULL);
    if (utf8len == 0)
    {
        return "";
    }

    std::string utf8Str;
    utf8Str.resize(utf8len);
    ::WideCharToMultiByte(CP_UTF8, 0, str.data(), str.size(), &utf8Str[0], utf8Str.size(), NULL, NULL);

    return utf8Str;
}

struct CryptProvHandle
{
    HCRYPTPROV Handle = NULL;
    CryptProvHandle(HCRYPTPROV handle = NULL) : Handle(handle) {}
    ~CryptProvHandle() { if (Handle) ::CryptReleaseContext(Handle, 0); }
};

HCRYPTPROV token_logon(const std::wstring& containerName, const std::string& tokenPin)
{
    CryptProvHandle cryptProv;
    if (!::CryptAcquireContext(&cryptProv.Handle, containerName.c_str(), ETOKEN_BASE_CRYPT_PROV_NAME.c_str(), PROV_RSA_FULL, CRYPT_SILENT))
    {
        std::wcerr << L"CryptAcquireContext failed, error " << std::hex << std::showbase << ::GetLastError() << L"\n";
        return NULL;
    }

    if (!::CryptSetProvParam(cryptProv.Handle, PP_SIGNATURE_PIN, reinterpret_cast<const BYTE*>(tokenPin.c_str()), 0))
    {
        std::wcerr << L"CryptSetProvParam failed, error " << std::hex << std::showbase << ::GetLastError() << L"\n";
        return NULL;
    }

    auto result = cryptProv.Handle;
    cryptProv.Handle = NULL;
    return result;
}

int wmain(int argc, wchar_t** argv)
{
    if (argc < 6)
    {
        std::wcerr << L"usage: etokensign.exe <certificate file path> <private key container name> <token PIN> <timestamp URL> <path to file to sign>\n";
        return 1;
    }

    const std::wstring certFile = argv[1];
    const std::wstring containerName = argv[2];
    const std::wstring tokenPin = argv[3];
    const std::wstring timestampUrl = argv[4];
    const std::wstring fileToSign = argv[5];

    CryptProvHandle cryptProv = token_logon(containerName, utf16_to_utf8(tokenPin));
    if (!cryptProv.Handle)
    {
        return 1;
    }

    CRYPTUI_WIZ_DIGITAL_SIGN_EXTENDED_INFO extInfo = {};
    extInfo.dwSize = sizeof(extInfo);
    extInfo.pszHashAlg = szOID_NIST_sha256; // Use SHA256 instead of default SHA1

    CRYPT_KEY_PROV_INFO keyProvInfo = {};
    keyProvInfo.pwszContainerName = const_cast<wchar_t*>(containerName.c_str());
    keyProvInfo.pwszProvName = const_cast<wchar_t*>(ETOKEN_BASE_CRYPT_PROV_NAME.c_str());
    keyProvInfo.dwProvType = PROV_RSA_FULL;

    CRYPTUI_WIZ_DIGITAL_SIGN_CERT_PVK_INFO pvkInfo = {};
    pvkInfo.dwSize = sizeof(pvkInfo);
    pvkInfo.pwszSigningCertFileName = const_cast<wchar_t*>(certFile.c_str());
    pvkInfo.dwPvkChoice = CRYPTUI_WIZ_DIGITAL_SIGN_PVK_PROV;
    pvkInfo.pPvkProvInfo = &keyProvInfo;

    CRYPTUI_WIZ_DIGITAL_SIGN_INFO signInfo = {};
    signInfo.dwSize = sizeof(signInfo);
    signInfo.dwSubjectChoice = CRYPTUI_WIZ_DIGITAL_SIGN_SUBJECT_FILE;
    signInfo.pwszFileName = fileToSign.c_str();
    signInfo.dwSigningCertChoice = CRYPTUI_WIZ_DIGITAL_SIGN_PVK;
    signInfo.pSigningCertPvkInfo = &pvkInfo;
    signInfo.pwszTimestampURL = timestampUrl.c_str();
    signInfo.pSignExtInfo = &extInfo;

    if (!::CryptUIWizDigitalSign(CRYPTUI_WIZ_NO_UI, NULL, NULL, &signInfo, NULL))
    {
        std::wcerr << L"CryptUIWizDigitalSign failed, error " << std::hex << std::showbase << ::GetLastError() << L"\n";
        return 1;
    }

    std::wcout << L"Successfully signed " << fileToSign << L"\n";
    return 0;
}

Exporting the Certificate to a File:

Private Key Container Name:

回答4:

Actually on Windows you can specify the token password fully programmatically. This can be done by creating a context (CryptAcquireContext) with flag CRYPT_SILENT using token name in form "\\.\AKS ifdh 0" or token container name, which is some guid visible in cerificate properties in the Authentication Client application. You then need to use CryptSetProvParam with parameter PP_SIGNATURE_PIN to specify your token password. After that the process can use certificates on that token to sign files.
Note: once you create the context is seems to just work for current process entirely, no need to pass it to other Crypto API functions or anything. But feel free to comment if you find a situation when some more efforts will be required.
Edit: added code sample

HCRYPTPROV OpenToken(const std::wstring& TokenName, const std::string& TokenPin)
{
    const wchar_t DefProviderName[] = L"eToken Base Cryptographic Provider";

    HCRYPTPROV hProv = NULL;
    // Token naming can be found in "eToken Software Developer's Guide"
    // Basically you can either use "\\.\AKS ifdh 0" form
    // Or use token's default container name, which looks like "ab-c0473610-8e6f-4a6a-ae2c-af944d09e01c"
    if(!CryptAcquireContextW(&hProv, TokenName.c_str(), DefProviderName, PROV_RSA_FULL, CRYPT_SILENT))
    {
        DWORD Error = GetLastError();
        //TracePrint("CryptAcquireContext for token %ws failed, error 0x%08X\n", TokenName.c_str(), Error);
        return NULL;
    }
    if(!CryptSetProvParam(hProv, PP_SIGNATURE_PIN, (BYTE*)TokenPin.c_str(), 0))
    {
        DWORD Error = GetLastError();
        //TracePrint("Token %ws unlock failed, error 0x%08X\n", TokenName.c_str(), Error);
        CryptReleaseContext(hProv, 0);
        return NULL;
    }
    else
    {
        //TracePrint("Unlocked token %ws\n", TokenName.c_str());
        return hProv;
    }
}

回答5:

Got an answer from Digicert:

Unfortunately, part of the security with the EV Code Signing Certificate is that you must enter the password everytime. There is not a way to automate it.

回答6:

I used AutoHotKey to automate the password entry using the script following. We have been trying to make a Web based front end for our developers to send the binaries to the Windows box with this script running so that it can be signed and returned.

  Loop
  {   
    Sleep 2000

    if (WinExist("Token Logon"))
    {   
      WinActivate ; use the window found above
      SendInput [your_password]
      SendInput {Enter}
    }   
    if (WinExist("DigiCert Certificate Utility for Windows©"))
    {   
      WinActivate ; use the window found above
      SendInput [your_password]
      SendInput {Enter}
    }   
  } 

I must note that what I shared is not completely not secure, but we also hit this issue requiring either purchasing signing keys for each developer or assigning a job of a signing manager that would approve the signature of released software. I believe those are the better, secure processes--that once things pass quality assurance and are approved for release, they can be officially signed. However, smaller company needs may dictate that this be done in some other automated way.

I originally used osslsigncode on Linux (before EV certificates) to automate signing of Windows executables (since we had a Linux server doing a lot of work for developer ease and collaboration). I have contacted the developer of osslsigncode to see if he can make use of the DigiCert SafeNet tokens to help automate it in a different way since I can see them on Linux. His reply provided hope but I am unsure of any progress and I could not dedicate more time to help

回答7:

I my case Digicert issue an Standard (OV) certificate for the CI, for free if you already have an EV certificate.

I know this is not the solution but if you cant put the token in the server (a cloud server) this is the way to go.

回答8:

Python variant of the tool:

import pywintypes
import win32con
import win32gui
import time



DIALOG_CAPTION = 'Token Logon'
DIALOG_CLASS = '#32770'
PASSWORD_EDIT_ID = 0x3ea
TOKEN_PASSWORD_FILE = 'password.txt'
SLEEP_TIME = 10


def get_token_password():
    password = getattr(get_token_password, '_password', None)
    if password is None:
        with open(TOKEN_PASSWORD_FILE, 'r') as f:
            password = get_token_password._password = f.read()

    return password

def enumHandler(hwnd, lParam):
    if win32gui.IsWindowVisible(hwnd):
        if win32gui.GetWindowText(hwnd) == DIALOG_CAPTION and win32gui.GetClassName(hwnd) == DIALOG_CLASS:
            print('Token logon dialog has been detected, trying to enter password...')
            try:
                ed_hwnd = win32gui.GetDlgItem(hwnd, PASSWORD_EDIT_ID)
                win32gui.SendMessage(ed_hwnd, win32con.WM_SETTEXT, None, get_token_password())
                win32gui.PostMessage(ed_hwnd, win32con.WM_KEYDOWN, win32con.VK_RETURN, 0)
                print('Success.')
            except Exception as e:
                print('Fail: {}'.format(str(e)))
                return False

    return True


def main():
    while True:
        try:
            win32gui.EnumWindows(enumHandler, None)
            time.sleep(SLEEP_TIME)
        except pywintypes.error as e:
            if e.winerror != 0:
                raise e


if __name__ == '__main__':
    print('Token unlocker has been started...')
    print('DO NOT CLOSE THE WINDOW!')
    main()

Also, I have found, that oVirt console has default behaviour to send lock to Windows. You need to disable it in the server options and setup autologin.

回答9:

The way I do it is :

1. Open the token

   PCCERT_CONTEXT cert = OpenToken(SAFENET_TOKEN, EV_PASS);

2. Sign the file using the token, root / cross certificates when required and the EV certificate loaded into memory.

   HRESULT hr = SignAppxPackage(cert, FILETOSIGN);

Using SignerSignEx2():

The file is signed using SignerSignEx2() which needs to be loaded into memory using LoadLibrary() and GetProcAddress():

// Type definition for invoking SignerSignEx2 via GetProcAddress
typedef HRESULT(WINAPI *SignerSignEx2Function)(
    DWORD,
    PSIGNER_SUBJECT_INFO,
    PSIGNER_CERT,
    PSIGNER_SIGNATURE_INFO,
    PSIGNER_PROVIDER_INFO,
    DWORD,
    PCSTR,
    PCWSTR,
    PCRYPT_ATTRIBUTES,
    PVOID,
    PSIGNER_CONTEXT *,
    PVOID,
    PVOID);

// Load the SignerSignEx2 function from MSSign32.dll
HMODULE msSignModule = LoadLibraryEx(
    L"MSSign32.dll",
    NULL,
    LOAD_LIBRARY_SEARCH_SYSTEM32);

if (msSignModule)
{
    SignerSignEx2Function SignerSignEx2 = reinterpret_cast<SignerSignEx2Function>(
        GetProcAddress(msSignModule, "SignerSignEx2"));
    if (SignerSignEx2)
    {
        hr = SignerSignEx2(
            signerParams.dwFlags,
            signerParams.pSubjectInfo,
            signerParams.pSigningCert,
            signerParams.pSignatureInfo,
            signerParams.pProviderInfo,
            signerParams.dwTimestampFlags,
            signerParams.pszAlgorithmOid,
            signerParams.pwszTimestampURL,
            signerParams.pCryptAttrs,
            signerParams.pSipData,
            signerParams.pSignerContext,
            signerParams.pCryptoPolicy,
            signerParams.pReserved);
    }
    else
    {
        DWORD lastError = GetLastError();
        hr = HRESULT_FROM_WIN32(lastError);
    }

    FreeLibrary(msSignModule);
}
else
{
    DWORD lastError = GetLastError();
    hr = HRESULT_FROM_WIN32(lastError);
}

// Free any state used during app package signing
if (sipClientData.pAppxSipState)
{
    sipClientData.pAppxSipState->Release();
}

Time Stamping

Further, you must Time Stamp your signed file and do that using a Time Stamping authority to which you connect.

That is done by securely checking a Time Stamping server via URL for the current date and time. Each Signing authority have their own Time Stamping server. Time Stamping is an extra step in the Code Signing process, but when it comes to EV Code Signing it is a requirement which adds an additional layer of security to the signed PE. For that reason, add to your code a check whether the user is connected to the Internet.

DWORD dwReturnedFlag;
if (InternetGetConnectedState(&dwReturnedFlag,0) == NULL) // use https://docs.microsoft.com/en-us/windows/desktop/api/netlistmgr/nf-netlistmgr-inetworklistmanager-getconnectivity
{
    wprintf(L"Certificate can't be dated with no Internet connection\n");
    return 1;
}

Loading a certificate from a file

std::tuple<DWORD, DWORD, std::string> GetCertificateFromFile
(const wchar_t*                         FileName
    , std::shared_ptr<const CERT_CONTEXT>*   ResultCert)
{
    std::vector<unsigned char> vecAsn1CertBuffer;
    auto tuple_result = ReadFileToVector(FileName, &vecAsn1CertBuffer);

    if (std::get<0>(tuple_result) != 0)
    {
        return tuple_result;
    }

    return GetCertificateFromMemory(vecAsn1CertBuffer, ResultCert);
}

Loading a certificate into memory

std::tuple<DWORD, DWORD, std::string> GetCertificateFromMemory
(const std::vector<unsigned char>&      CertData
    , std::shared_ptr<const CERT_CONTEXT>*   ResultCert)
{
    const CERT_CONTEXT* crtResultCert = ::CertCreateCertificateContext
    (X509_ASN_ENCODING | PKCS_7_ASN_ENCODING
        , &CertData[0]
        , static_cast<DWORD>(CertData.size()));
    if (crtResultCert == NULL)
    {
        return std::make_tuple(E_FAIL
            , ::GetLastError()
            , "CertCreateCertificateContext");
    }

    *ResultCert = std::shared_ptr<const CERT_CONTEXT>(crtResultCert
        , ::CertFreeCertificateContext);
    return std::make_tuple(0, 0, "");
}

After the certificate has been loaded following accessing the hardware token we load it:

std::vector<unsigned char> dataCertEV(signingCertContext->pbCertEncoded,
        signingCertContext->pbCertEncoded + signingCertContext->cbCertEncoded);

Finally, the signing is done in the following function:

HRESULT SignAppxPackage(
    _In_ PCCERT_CONTEXT signingCertContext,
    _In_ LPCWSTR packageFilePath)
{
    HRESULT hr = S_OK;
    if (PathFileExists(CertAuthority_ROOT))
    {
        wprintf(L"Cross Certificate '%s' was found\n", CertAuthority_ROOT);
    }
    else
    {
        wprintf(L"Error: Cross Certificate '%s' was not found\n", CertAuthority_ROOT);
        return 3;
    }
    DWORD dwReturnedFlag;
    if (InternetGetConnectedState(&dwReturnedFlag,0) == NULL) 
    {
        wprintf(L"Certificate can't be dated with no Internet connection\n");
        return 1;
    }
    if (PathFileExists(CertAuthority_RSA))
    {
        wprintf(L"Cross Certificate '%s' was found\n", CertAuthority_RSA);
    }
    else
    {
        wprintf(L"Error: Cross Certificate '%s' was not found\n", CertAuthority_RSA);
        return 2;
    }
    if (PathFileExists(CROSSCERTPATH))
    {
        wprintf(L"Microsoft Cross Certificate '%s' was found\n", CROSSCERTPATH);

    }
    else
    {
        wprintf(L"Error: Microsoft Cross Certificate '%s' was not found\n", CROSSCERTPATH);
        return 3;
    }
    // Initialize the parameters for SignerSignEx2
    DWORD signerIndex = 0;

    SIGNER_FILE_INFO fileInfo = {};
    fileInfo.cbSize = sizeof(SIGNER_FILE_INFO);
    fileInfo.pwszFileName = packageFilePath;

    SIGNER_SUBJECT_INFO subjectInfo = {};
    subjectInfo.cbSize = sizeof(SIGNER_SUBJECT_INFO);
    subjectInfo.pdwIndex = &signerIndex;
    subjectInfo.dwSubjectChoice = SIGNER_SUBJECT_FILE;
    subjectInfo.pSignerFileInfo = &fileInfo;

    SIGNER_CERT_STORE_INFO certStoreInfo = {};
    certStoreInfo.cbSize = sizeof(SIGNER_CERT_STORE_INFO);
    certStoreInfo.dwCertPolicy = SIGNER_CERT_POLICY_STORE;// SIGNER_CERT_POLICY_CHAIN_NO_ROOT;
    certStoreInfo.pSigningCert = signingCertContext;

    // Issuer: 'CertAuthority RSA Certification Authority'
    // Subject 'CertAuthority RSA Extended Validation Code Signing CA'
    auto fileCertAuthorityRsaEVCA = CertAuthority_RSA;
    std::shared_ptr<const CERT_CONTEXT> certCertAuthorityRsaEVCA;
    auto tuple_result = GetCertificateFromFile(fileCertAuthorityRsaEVCA, &certCertAuthorityRsaEVCA);

    if (std::get<0>(tuple_result) != 0)
    {
        std::cout << "Error: " << std::get<0>(tuple_result) << " " << std::get<1>(tuple_result) << " " << std::get<2>(tuple_result) << "\n";
        return std::get<0>(tuple_result);
    }

    std::shared_ptr<const CERT_CONTEXT> certCertEV;
    std::vector<unsigned char> dataCertEV(signingCertContext->pbCertEncoded,
        signingCertContext->pbCertEncoded + signingCertContext->cbCertEncoded);
    tuple_result = GetCertificateFromMemory(dataCertEV, &certCertEV);

    if (std::get<0>(tuple_result) != 0)
    {
        std::cout << "Error: " << std::get<0>(tuple_result) << " " << std::get<1>(tuple_result) << " " << std::get<2>(tuple_result) << "\n";
        return std::get<0>(tuple_result);
    }

    // Issuer:  'Microsoft Code Verification Root'
    // Subject: 'CertAuthority RSA Certification Authority'
    auto fileCertCross = CertAuthority_ROOT;
    std::shared_ptr<const CERT_CONTEXT> certCertCross;
    tuple_result = GetCertificateFromFile(fileCertCross, &certCertCross);

    if (std::get<0>(tuple_result) != 0)
    {
        std::cout << "Error: " << std::get<0>(tuple_result) << " " << std::get<1>(tuple_result) << " " << std::get<2>(tuple_result) << "\n";
        return std::get<0>(tuple_result);
    }

    //certificate 1 Issuer  : '<Certificate Provider> RSA Certification Authority'
    //              Subject : '<Certificate Provider> Extended Validation Code Signing CA'
    //
    //certificate 2 Issuer  : '<Certificate Provider> Extended Validation Code Signing CA'
    //              Subject : '<Your company / entity name>'
    //
    //certificate 3 Issuer  : 'Microsoft Code Verification Root'
    //              Subject : '<Certificate Provider> Certification Authority'

    std::vector<std::shared_ptr<const CERT_CONTEXT> > certs;
    certs.push_back(certCertAuthorityRsaEVCA);
    certs.push_back(certCertEV);
    certs.push_back(certCertCross);

    std::shared_ptr<void> resultStore;
    tuple_result = FormMemoryCertStore(certs, CERT_STORE_ADD_NEW, &resultStore);

    if (std::get<0>(tuple_result) != 0)
    {
        std::cout << "Error: " << std::get<0>(tuple_result) << " " << std::get<1>(tuple_result) << " " << std::get<2>(tuple_result) << "\n";
        return std::get<0>(tuple_result);
    }

    certStoreInfo.hCertStore = resultStore.get();
    //--------------------------------------------------------------------

    SIGNER_CERT cert = {};
    cert.cbSize = sizeof(SIGNER_CERT);
    cert.dwCertChoice = SIGNER_CERT_STORE;
    cert.pCertStoreInfo = &certStoreInfo;

    // The algidHash of the signature to be created must match the
    // hash algorithm used to create the app package
    SIGNER_SIGNATURE_INFO signatureInfo = {};
    signatureInfo.cbSize = sizeof(SIGNER_SIGNATURE_INFO);
    signatureInfo.algidHash = CALG_SHA_256;
    signatureInfo.dwAttrChoice = SIGNER_NO_ATTR;

    SIGNER_SIGN_EX2_PARAMS signerParams = {};
    signerParams.pSubjectInfo = &subjectInfo;
    signerParams.pSigningCert = &cert;
    signerParams.pSignatureInfo = &signatureInfo;
    signerParams.dwTimestampFlags = SIGNER_TIMESTAMP_RFC3161;
    signerParams.pszAlgorithmOid = szOID_NIST_sha256;
    //signerParams.dwTimestampFlags = SIGNER_TIMESTAMP_AUTHENTICODE;
    //signerParams.pszAlgorithmOid = NULL;
    signerParams.pwszTimestampURL = TIMESTAMPURL;

    APPX_SIP_CLIENT_DATA sipClientData = {};
    sipClientData.pSignerParams = &signerParams;
    signerParams.pSipData = &sipClientData;

    // Type definition for invoking SignerSignEx2 via GetProcAddress
    typedef HRESULT(WINAPI *SignerSignEx2Function)(
        DWORD,
        PSIGNER_SUBJECT_INFO,
        PSIGNER_CERT,
        PSIGNER_SIGNATURE_INFO,
        PSIGNER_PROVIDER_INFO,
        DWORD,
        PCSTR,
        PCWSTR,
        PCRYPT_ATTRIBUTES,
        PVOID,
        PSIGNER_CONTEXT *,
        PVOID,
        PVOID);

    // Load the SignerSignEx2 function from MSSign32.dll
    HMODULE msSignModule = LoadLibraryEx(
        L"MSSign32.dll",
        NULL,
        LOAD_LIBRARY_SEARCH_SYSTEM32);

    if (msSignModule)
    {
        SignerSignEx2Function SignerSignEx2 = reinterpret_cast<SignerSignEx2Function>(
            GetProcAddress(msSignModule, "SignerSignEx2"));
        if (SignerSignEx2)
        {
            hr = SignerSignEx2(
                signerParams.dwFlags,
                signerParams.pSubjectInfo,
                signerParams.pSigningCert,
                signerParams.pSignatureInfo,
                signerParams.pProviderInfo,
                signerParams.dwTimestampFlags,
                signerParams.pszAlgorithmOid,
                signerParams.pwszTimestampURL,
                signerParams.pCryptAttrs,
                signerParams.pSipData,
                signerParams.pSignerContext,
                signerParams.pCryptoPolicy,
                signerParams.pReserved);
        }
        else
        {
            DWORD lastError = GetLastError();
            hr = HRESULT_FROM_WIN32(lastError);
        }

        FreeLibrary(msSignModule);
    }
    else
    {
        DWORD lastError = GetLastError();
        hr = HRESULT_FROM_WIN32(lastError);
    }

    // Free any state used during app package signing
    if (sipClientData.pAppxSipState)
    {
        sipClientData.pAppxSipState->Release();
    }

    return hr;
}

See this article I wrote.