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https://issues.apache.org/jira/browse/PDFBOX-5110?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tilman Hausherr updated PDFBOX-5110:
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Labels: optimization (was: )
> improve performance in signature validation
> -------------------------------------------
>
> Key: PDFBOX-5110
> URL: https://issues.apache.org/jira/browse/PDFBOX-5110
> Project: PDFBox
> Issue Type: Improvement
> Components: Signing
> Affects Versions: 2.0.22, 3.0.0 PDFBox
> Environment: java8
> Reporter: Jordi Boixadera
> Priority: Major
> Labels: optimization
> Attachments: COSFilterInputStream.java, TESTPdfbox.zip
>
>
> We are developing a software that validates integrity of PDF signatures using
> PDFBox.
> We have faced a performance problem in the PDF validation, we have found the
> class that is causing the problem, and have made an improved version of it.
> We are doing the validation in the same way as it is done here
> [https://github.com/mkl-public/testarea-pdfbox2/blob/master/src/test/java/mkl/testarea/pdfbox2/sign/ValidateSignature.java]
> , method "validateSignaturesImproved". This method uses
> PDSignature.getContents() and PDSignature.getSignedContent()
> When validating big PDF files of more than 3MB we realized the performance in
> validation was very high.
> In the end we found that,
> org.apache.pdfbox.pdmodel.interactive.digitalsignature.COSFilterInputStream
> was reading the document byte-by-byte, checking ranges every byte.
> We have rewritten COSFilterInputStream to work with byte blocks and the
> validation time has dropped a lot.
> We have tested this in PDFBox 2.0.22 and 3.0.0-SNAPSHOT. We have attached the
> test project (TestPDFBox.zip). Here is the code that reproduces the problem:
> {code:java}
> try(PDDocument doc = Loader.loadPDF(new File(args[0]))){
> PDSignature signature =
> doc.getLastSignatureDictionary();
> byte[] signedContent = signature.getSignedContent(new
> FileInputStream(args[0]));
> byte[] signatureBytes = signature.getContents();
> }
> {code}
> Without our modification, with a 3MB signed PDF, it takes 10 seconds to do
> this. With our modification, it takes 0.2 seconds.
> We would like to have this improved code reviewed in pdfbox.
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