Signature Extraction

Extract signature certificate

Use this workflow when you need to save the certificate associated with an existing signature.

Steps

1. Create a PdfFileSignature instance and bind the signed PDF.
2. Select the signature name to inspect.
3. Call extractCertificate to open the certificate stream.
4. Copy the certificate bytes to an output file.
5. Close the stream resources and the facade object.

Java example

public static void extractSignatureCertificate(Path inputFile, Path outputFile) throws Exception {
    PdfFileSignature pdfSignature = new PdfFileSignature();
    try {
        pdfSignature.bindPdf(inputFile.toString());
        SignatureName signatureName = pdfSignature.getSignatureNames().get_Item(0);
        try (InputStream inputStream = pdfSignature.extractCertificate(signatureName);
             OutputStream outputStream = Files.newOutputStream(outputFile)) {
            inputStream.transferTo(outputStream);
        }
    } finally {
        pdfSignature.close();
    }
}

The current PdfFileSignatureExamples.java class does not include a dedicated Java sample for extracting a rendered signature image.