Tilldela och validera digitala signaturer med JavaScript via C++
Introduktion
Använd Digital Signature dialogrutan för att bifoga en digital signatur. Digital Signature dialogrutan listar giltiga certifikat. Du kan använda Digital Signature dialogrutan för att visa certifikat och välja det du vill använda. Om en arbetsbok har en digital signatur, visas namnet på signaturen i fältet Certifikatnamn. Om du klickar på knappen Ta bort i Digital Signature dialogrutan, tar Microsoft Excel bort den digitala signaturen också.
Så här lägger du till digital signatur för Excel
Aspose.Cells tillhandahåller modulen DigitalSignature för att utföra jobbet (tilldela och validera digitala signaturer). Modulen har några användbara funktioner för att lägga till och validera digitala signaturer.
Se följande exempel på kod som beskriver hur du kan utföra uppgiften med Aspose.Cells for JavaScript via C++ API.
<!DOCTYPE html>
<html>
<head>
<title>Aspose.Cells Example</title>
<meta charset="utf-8" />
</head>
<body>
<h1>Digital Signature: Sign and Verify Workbook</h1>
<label for="pfxInput">Select PFX Certificate (.pfx):</label>
<input type="file" id="pfxInput" accept=".pfx" />
<br /><br />
<label for="certPassword">Certificate Password:</label>
<input type="text" id="certPassword" value="aa" />
<br /><br />
<label for="signatureComment">Signature Comment:</label>
<input type="text" id="signatureComment" value="test for sign" />
<br /><br />
<button id="runExample">Sign Workbook and Verify</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 } = 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 pfxInput = document.getElementById('pfxInput');
if (!pfxInput.files.length) {
document.getElementById('result').innerHTML = '<p style="color: red;">Please select a .pfx certificate file.</p>';
return;
}
const password = document.getElementById('certPassword').value || "";
const comment = document.getElementById('signatureComment').value || "";
// Read the PFX file
const pfxFile = pfxInput.files[0];
const pfxArrayBuffer = await pfxFile.arrayBuffer();
const pfxBytes = new Uint8Array(pfxArrayBuffer);
// dsc is signature collection that contains one or more signatures needed to sign
const dsc = new DigitalSignatureCollection();
// Cert must contain a private key, constructed from the PFX bytes
const cert = new DigitalSignature(pfxBytes, password, comment, new Date());
dsc.add(cert);
// Create a new workbook
const wb = new Workbook();
// wb.setDigitalSignature signs all signatures in dsc -> converted to property assignment
wb.digitalSignature = dsc;
// Saving the modified Excel file
const outputData = wb.save(SaveFormat.Xlsx);
const blob = new Blob([outputData]);
const downloadLink = document.getElementById('downloadLink');
downloadLink.href = URL.createObjectURL(blob);
downloadLink.download = 'newfile_out.xlsx';
downloadLink.style.display = 'block';
downloadLink.textContent = 'Download Signed Excel File';
// Open the file from the generated data to verify signatures
const wb2 = new Workbook(new Uint8Array(outputData));
// isDigitallySigned property
const signedStatus = wb2.isDigitallySigned;
// Get digitalSignature collection from workbook
const dsc2 = wb2.digitalSignature;
let detailsHtml = `<p style="color: green;">Workbook signed: ${signedStatus}</p>`;
if (dsc2 && dsc2.count > 0) {
detailsHtml += '<h3>Signatures:</h3><ul>';
for (let i = 0; i < dsc2.count; i++) {
const dst = dsc2.get(i);
const dstComments = dst.comments;
const dstSignTime = dst.signTime;
const dstIsValid = dst.isValid ? dst.isValid() : "N/A";
detailsHtml += `<li>
<strong>Signature ${i + 1}:</strong><br/>
Comments: ${dstComments}<br/>
Sign Time: ${dstSignTime}<br/>
Is Valid: ${dstIsValid}
</li>`;
}
detailsHtml += '</ul>';
} else {
detailsHtml += '<p>No digital signatures found in the workbook.</p>';
}
document.getElementById('result').innerHTML = detailsHtml;
});
</script>
</html>