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https://issues.apache.org/jira/browse/PDFBOX-4421?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17197129#comment-17197129
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Tilman Hausherr edited comment on PDFBOX-4421 at 10/7/20, 4:16 PM:
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Encryption and decryption is there but IIRC length 128 doesn't work with
external software. I don't have enough time right now, sadly. Maybe in a few
days. Yes this is something you could try. I tried at that time and wasn't
successful. The file I created at that time does have /V 4. But it's really the
decryption that matters most. There is no real need to encrypt with 128, one
should choose 256 (which works).
was (Author: tilman):
Encryption and decryption is there but IIRC length 128 doesn't work with
external software.
[Code|https://kb.itextpdf.com/home/it7kb/examples/certificate-encryption] that
I used to create an encrypted PDF to try decryption (at that time, I used itext
7.1.3 + bc 1.60). I don't have enough time right now, sadly. Maybe in a few
days. Yes this is something you could try. I tried at that time and wasn't
successful. The file I created at that time does have /V 4. But it's really the
decryption that matters most. There is no real need to encrypt with 128, one
should choose 256 (which works).
> Add support for AES128 encryption for public key
> ------------------------------------------------
>
> Key: PDFBOX-4421
> URL: https://issues.apache.org/jira/browse/PDFBOX-4421
> Project: PDFBox
> Issue Type: Bug
> Components: Crypto
> Affects Versions: 2.0.13
> Reporter: Tilman Hausherr
> Assignee: Tilman Hausherr
> Priority: Major
> Labels: AES128
> Fix For: 2.0.22, 3.0.0 PDFBox
>
> Attachments: AESkeylength128.pdf, AESkeylength256.pdf,
> B2-AES-256-secured.pdf, B2-Adobe-128-aes-sec.pdf,
> PDFBOX-4421_Add_support_for_AES128_encryption_for_public_key_(AES128,_256_-_filter_based_k.patch,
> PDFBOX-4421_Add_support_for_AES128_encryption_for_public_key_(DRAFT).patch,
> image-2020-09-16-10-32-11-060.png, image-2020-09-16-10-33-55-201.png,
> image-2020-09-16-11-55-33-275.png, keystore.pfx, screenshot-1.png
>
>
> Follow-up of PDFBOX-4413. AES256 works for public key crypto, but AES128
> doesn't when the file is generated by an external software. (local tests
> work) We should at least get the decryption to work.
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