Signature Verification

Verify PDF signature

Use this workflow when you need a quick validation pass over an existing signed PDF.

Steps

1. Create a PdfFileSignature instance and bind the signed PDF.
2. Select the signature name you want to inspect.
3. Call verifySignature to validate the signature.
4. Call coversWholeDocument to check coverage.
5. Close the facade object.

Java example

public static void verifyPdfSignature(Path inputFile) {
    PdfFileSignature pdfSignature = new PdfFileSignature();
    try {
        pdfSignature.bindPdf(inputFile.toString());
        SignatureName signatureName = pdfSignature.getSignatureNames().get_Item(0);
        System.out.println("Signature '" + signatureName + "' is valid: " + pdfSignature.verifySignature(signatureName));
        System.out.println("Signature covers whole document: " + pdfSignature.coversWholeDocument(signatureName));
    } finally {
        pdfSignature.close();
    }
}