ERROR: Can't write signature, not enough space; adjust it with SignatureOptions.setPreferredSignatureSize

[mauzi]

Hi,
I have a big success signing PDF files with BASELINE_LTA profile, but some certificates with longer chains drop the error:

SEVERE Error occured
eu.europa.esig.dss.model.DSSException: Unable to save a document. Reason : Can't write signature, not enough space; adjust it with SignatureOptions.setPreferredSignatureSize
        at eu.europa.esig.dss.pdf.pdfbox.PdfBoxSignatureService.saveDocumentIncrementally(PdfBoxSignatureService.java:422)
        at eu.europa.esig.dss.pdf.pdfbox.PdfBoxSignatureService.checkEncryptedAndSaveIncrementally(PdfBoxSignatureService.java:406)
        at eu.europa.esig.dss.pdf.pdfbox.PdfBoxSignatureService.signDocumentAndReturnDigest(PdfBoxSignatureService.java:230)
        at eu.europa.esig.dss.pdf.pdfbox.PdfBoxSignatureService.signDocument(PdfBoxSignatureService.java:166)
        at eu.europa.esig.dss.pdf.AbstractPDFSignatureService.sign(AbstractPDFSignatureService.java:294)
        at eu.europa.esig.dss.pades.signature.PAdESService.signDocument(PAdESService.java:218)
        at com.github.intoolswetrust.jsignpdf.pades.Main.signFiles(Main.java:166)
        at com.github.intoolswetrust.jsignpdf.pades.Main.main(Main.java:80)
Caused by: java.io.IOException: Can't write signature, not enough space; adjust it with SignatureOptions.setPreferredSignatureSize
        at org.apache.pdfbox.pdfwriter.COSWriter.writeExternalSignature(COSWriter.java:845)
        at org.apache.pdfbox.pdfwriter.COSWriter.doWriteSignature(COSWriter.java:793)
        at org.apache.pdfbox.pdfwriter.COSWriter.visitFromDocument(COSWriter.java:1199)
        at org.apache.pdfbox.cos.COSDocument.accept(COSDocument.java:452)
        at org.apache.pdfbox.pdfwriter.COSWriter.write(COSWriter.java:1435)
        at org.apache.pdfbox.pdmodel.PDDocument.saveIncremental(PDDocument.java:1412)
        at eu.europa.esig.dss.pdf.pdfbox.PdfBoxSignatureService.saveDocumentIncrementally(PdfBoxSignatureService.java:420)

Could you please adjust the signature size in PdfBox, please?
Thanks!

[mauzi]

Okay, so famous last words: 20000 bytes should be enough for everyone...

--- Main.java.orig      2023-01-03 20:30:10.000000000 +0100
+++ Main.java   2025-07-08 18:22:55.563076759 +0200
@@ -98,6 +98,9 @@
             // We choose the level of the signature (-B, -T, -LT, -LTA).
             parameters.setSignatureLevel(config.getPadesLevel().getSignatureLevel());
.
+            // Set content size for all signature information
+            parameters.setContentSize(20000);
+
             // We set the digest algorithm to use with the signature algorithm. You must use the
             // same parameter when you invoke the method sign on the token. The default value is
             // SHA256