Support for XAdES Signature with C++

Introduction

Aspose.Cells provides support for signing workbooks with XAdES Signature. For this, the API provides the DigitalSignature class and the XAdESType enumeration.

How to Add XAdES Signature for Excel

The following code snippet demonstrates the use of the DigitalSignature class to sign the source workbook.

#include <iostream>
#include <chrono>
#include <ctime>
#include "Aspose.Cells.h"
using namespace Aspose::Cells;
using namespace Aspose::Cells::DigitalSignatures;

int main()
{
    Aspose::Cells::Startup();

    U16String srcDir(u"..\\Data\\01_SourceDirectory\\");
    U16String outDir(u"..\\Data\\02_OutputDirectory\\");
    Workbook workbook(srcDir + u"sourceFile.xlsx");
    U16String password(u"pfxPassword");
    U16String pfxFile(u"pfxFile");
    Vector<uint8_t> pfxData;

    auto now = std::chrono::system_clock::now();
    std::time_t now_time = std::chrono::system_clock::to_time_t(now);
    std::tm local_tm;
    localtime_s(&local_tm, &now_time);

    int year = local_tm.tm_year + 1900;
    int month = local_tm.tm_mon + 1;
    int day = local_tm.tm_mday;
    int hour = local_tm.tm_hour;
    int minute = local_tm.tm_min;
    int second = local_tm.tm_sec;
    auto ms = std::chrono::duration_cast<std::chrono::milliseconds>(now.time_since_epoch()) % 1000;

    DigitalSignature signature(pfxData, password, u"testXAdES", Date{ year, month, day, hour, minute, second, static_cast<int>(ms.count()) });
    signature.SetXAdESType(XAdESType::XAdES);
    DigitalSignatureCollection dsCollection;
    dsCollection.Add(signature);
    workbook.SetDigitalSignature(dsCollection);
    workbook.Save(outDir + u"XAdESSignatureSupport_out.xlsx");

    std::cout << "Digital signature added successfully!" << std::endl;

    Aspose::Cells::Cleanup();
}