1010299: changes updated

Author: Gowrishankar-kumar

Document-Processing/PDF/PDF-Library/javascript/DigitalSignature.md

@@ -521,6 +521,69 @@ ldocument.destroy();
 {% endhighlight %}
 {% endtabs %}
 
+## Adding a timestamp in digital signature
+
+This example shows how to apply a digital signature with a trusted timestamp, ensuring the signature remains valid even after the certificate expires. A timestamp callback contacts a Time Stamping Authority (TSA) to add an official time record to the signature. This provides long‑term proof of when the document was signed.
+
+{% tabs %}
+{% highlight typescript tabtitle="TypeScript" %}
+
+import { PdfDocument, PdfPage, PdfForm, PdfSignatureField, PdfSignature, CryptographicStandard, DigestAlgorithm } from '@syncfusion/ej2-pdf';
+
+// Load the document
+let document: PdfDocument = new PdfDocument(data);
+// Gets the first page of the document
+let page: PdfPage = document.getPage(0);
+// Access the PDF form
+let form: PdfForm = document.form;
+// Create a new signature field
+let field: PdfSignatureField = new PdfSignatureField(page, 'Signature', {x: 10, y: 10, width: 100, height: 50});
+// Create a timestamp callback
+async function timestampCallback(request: Uint8Array): Promise<{ response: Uint8Array }> {
+    // Implement timestamp response logic here
+    return { response: new Uint8Array() }; // Placeholder return
+}
+// Create a new signature using PFX data, private key and call back function for timestamp
+const signature: PdfSignature = PdfSignature.create(certData, password, { cryptographicStandard: CryptographicStandard.cms, digestAlgorithm: DigestAlgorithm.sha256 }, timestampCallback);
+// Sets the signature to the field
+field.setSignature(signature);
+// Add the field into PDF form
+form.add(field);
+// Save the document
+await document.saveAsync('output.pdf');
+// Destroy the document
+document.destroy();
+
+{% endhighlight %}
+{% highlight javascript tabtitle="JavaScript" %}
+
+// Load the document
+var document = new ej.pdf.PdfDocument(data);
+// Gets the first page of the document
+var page = document.getPage(0);
+// Access the PDF form
+var form = document.form;
+// Create a new signature field
+var field = new ej.pdf.PdfSignatureField(page, 'Signature', {x: 10, y: 10, width: 100, height: 50});
+// Create a timestamp callback
+async function timestampCallback(request) {
+    // Implement timestamp response logic here
+    return { response: new Uint8Array() }; // Placeholder return
+}
+// Create a new signature using PFX data, private key and call back function for timestamp
+const signature = PdfSignature.create(certData, password, { cryptographicStandard: ej.pdf.CryptographicStandard.cms, digestAlgorithm: ej.pdf.DigestAlgorithm.sha256 }, timestampCallback);
+// Sets the signature to the field
+field.setSignature(signature);
+// Add the field into PDF form
+form.add(field);
+// Save the document
+await document.saveAsync('output.pdf');
+// Destroy the document
+document.destroy();
+
+{% endhighlight %}
+{% endtabs %}
+
 ## Drawing text/image in the Signature Appearance
 
 This example demonstrates how to create a visible signature field, apply a CMS (SHA-256) digital signature with signer information, customize the signature appearance using a base64-encoded image, and save the signed PDF document.

Document-Processing/PDF/PDF-Library/javascript/Redaction.md

@@ -14,6 +14,8 @@ N> For redaction features, you need to install the `@syncfusion/ej2-pdf-data-ext
 ## Removing sensitive content from the PDF document
 
 Redaction permanently removes confidential or sensitive information from a PDF. The `PdfRedactor` and `PdfRedactionRegion` classes allow you to mark specific areas and apply irreversible redaction to the document.
+> **Note:**  
+> When calling `redact(callback)`, the callback is executed to render each redaction region on a canvas before the content is permanently removed. This allows customizing the final appearance of the redacted area.
 
 {% tabs %}
 {% highlight typescript tabtitle="TypeScript" %}
@@ -29,14 +31,15 @@ let redactions: PdfRedactionRegion[] = [];
 redactions.push(new PdfRedactionRegion(0, {x: 10, y: 10, width: 100, height: 50}));
 redactor.add(redactions);
 // Apply redactions on the PDF document
-redactor.redact();
+redactor.redactSync();
 // Save the document
 document.save('output.pdf');
 // Destroy the document
 document.destroy();
 
 {% endhighlight %}
 {% highlight javascript tabtitle="JavaScript" %}
+
 // Load the document
 var document = new ej.pdf.PdfDocument(data);
 // Create a new text extractor
@@ -46,7 +49,7 @@ var redactions = [];
 redactions.push(new PdfRedactionRegion(0, {x: 10, y: 10, width: 100, height: 50}));
 redactor.add(redactions);
 // Apply redactions on the PDF document
-redactor.redact();
+redactor.redactSync();
 // Save the document
 document.save('output.pdf');
 // Destroy the document
@@ -77,13 +80,15 @@ redactions.push(redaction);
 // Add redactions with specified options.
 redactor.add(redactions);
 // Apply redactions on the PDF document
-redactor.redact();
+redactor.redactSync();
 // Save the document
 document.save('output.pdf');
 // Destroy the document
 document.destroy();
+
 {% endhighlight %}
 {% highlight javascript tabtitle="JavaScript" %}
+
 // Load an existing PDF document
 var document = new ej.pdf.PdfDocument(data);
 // Add redactions to the collection
@@ -98,7 +103,7 @@ redactions.push(redaction);
 // Add redactions with specified options.
 redactor.add(redactions);
 // Apply redactions on the PDF document
-redactor.redact();
+redactor.redactSync();
 // Save the document
 document.save('output.pdf');
 // Destroy the document
@@ -137,7 +142,7 @@ let redactor = new PdfRedactor(document);
 // Add redactions with specified options
 redactor.add(redactions);
 // Apply redactions on the PDF document
-redactor.redact();
+redactor.redactSync();
 // Save the document
 document.save('output.pdf');
 // Destroy the document
@@ -168,7 +173,7 @@ redactions.push(redaction);
 var redactor = new ej.pdf.PdfRedactor(document);
 // Add redactions and apply them
 redactor.add(redactions);
-redactor.redact();
+redactor.redactSync();
 // Save and dispose
 document.save('output.pdf');
 document.destroy();