![]() ![]() This affects mainly PDF signing-software such as PDF-AS, PDF-Over, the Austrian Mobile Phone Signature, as well as the citizen card software (CCS) MOCCA/Online-BKU and a.sign client.Ĭonversion to the new signature format is another step towards standardization, interoperability, and sustainability of signed documents and significantly facilitates their verification with tools such as Adobe Reader. Starting with the beginning of November 2014, PAdES will be gradually integrated into existing e-government components. PDF documents signed according to PAdES are valid. ![]() This will change with the upcoming release of the signature-verification tool, which will omit the Manifest field at all. When verifying PAdES signatures, the Manifest field is therefore greyed out in the displayed result page (see screenshot below). The Manifest is relevant for PDF signatures according to the PDF-AS format only. I personally tested it on about a thousand signed/unsigned PDFs and it seems to work too, probably better than mine in case of complex signatures.Please note: The new PDF-based signature format PAdES does not require a Manifest ("M") any more. Return !fields.getSignatureNames().isEmpty() you can to check "Sigflags" and stop at the first match: grep -m1 "/Sigflags" $", fi.getName()) Īnother function that should work correctly (I found it checking recently a paper written by Bruno Lowagie, Digital Signatures for PDF documents, page 124) is the following one: private Boolean isSignedShorter(URL URL)ĪcroFields fields = reader.getAcroFields() This is not the optimal solution, but it is another one. Using a PDF library that can use the document's cross-reference table to navigate you to the right indirect objects should be faster and less resource-intensive than a brute-force search of the document for a certificate. Otherwise, you need to walk each entry of the 'Fields' Array looking for a field dictionary with an 'FT' (Field Type) entry set to 'Sig' (signature), with a 'V' (Value) entry that is not null. You basically want to first check if there is an (optional) 'SigFlags' entry, in which case a non-zero value would indicate that there is a signature in the Fields Array. ![]()
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