Support for XAdES Signature with JavaScript via C++

Introduction

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

<!DOCTYPE html>
<html>
    <head>
        <title>Aspose.Cells XAdES Signature Example</title>
    </head>
    <body>
        <h1>XAdES Digital Signature Example</h1>
        <p>
            Select an Excel file and a PFX certificate file (.pfx). Then click "Run Example" to sign the workbook.
        </p>
        <input type="file" id="fileInput" accept=".xls,.xlsx,.csv" />
        <input type="file" id="pfxInput" accept=".pfx" />
        <button id="runExample">Run Example</button>
        <a id="downloadLink" style="display: none;">Download Result</a>
        <div id="result"></div>
    </body>

    <script src="aspose.cells.js.min.js"></script>
    <script type="text/javascript">
        const { Workbook, SaveFormat, DigitalSignature, DigitalSignatureCollection, XAdESType, Utils } = AsposeCells;
        
        AsposeCells.onReady({
            license: "/lic/aspose.cells.enc",
            fontPath: "/fonts/",
            fontList: [
                "arial.ttf",
                "NotoSansSC-Regular.ttf"
            ]
        }).then(() => {
            console.log("Aspose.Cells initialized");
        });

        document.getElementById('runExample').addEventListener('click', async () => {
            const fileInput = document.getElementById('fileInput');
            const pfxInput = document.getElementById('pfxInput');
            const resultDiv = document.getElementById('result');

            if (!fileInput.files.length) {
                resultDiv.innerHTML = '<p style="color: red;">Please select an Excel file.</p>';
                return;
            }
            if (!pfxInput.files.length) {
                resultDiv.innerHTML = '<p style="color: red;">Please select a PFX certificate file.</p>';
                return;
            }

            const file = fileInput.files[0];
            const pfxFile = pfxInput.files[0];

            // Read Excel file
            const arrayBuffer = await file.arrayBuffer();
            const workbook = new Workbook(new Uint8Array(arrayBuffer));

            // Read PFX file
            const pfxArrayBuffer = await pfxFile.arrayBuffer();
            const pfxBytes = new Uint8Array(pfxArrayBuffer);

            // Create DigitalSignature using PFX bytes, password, signature name and signing time
            const signature = new DigitalSignature(pfxBytes, "aspose", "testXAdES", new Date());
            // Set XAdES type property (converted from setXAdESType)
            signature.xAdESType = AsposeCells.XAdESType.XAdES;

            const dsCollection = new DigitalSignatureCollection();
            dsCollection.add(signature);

            // Assign digital signature collection to workbook (converted from setDigitalSignature)
            workbook.digitalSignature = dsCollection;

            // Save workbook and provide download link
            const outputData = workbook.save(SaveFormat.Xlsx);
            const blob = new Blob([outputData]);
            const downloadLink = document.getElementById('downloadLink');
            downloadLink.href = URL.createObjectURL(blob);
            downloadLink.download = 'XAdESSignatureSupport_out.xlsx';
            downloadLink.style.display = 'block';
            downloadLink.textContent = 'Download Signed Excel File';

            resultDiv.innerHTML = '<p style="color: green;">Workbook signed successfully! Click the download link to get the signed file.</p>';
        });
    </script>
</html>

Add Digital Signature to an already signed Excel file with JavaScript via C++ Create Signature Line in an Excel Workbook using Aspose.Cells for JavaScript via C++