[PDFBOX-4477] Large encrypted file takes days to be parsed

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.0.14
• Fix Version/s: 2.0.15, 3.0.0 PDFBox
• Component/s: Crypto, Parsing
• Labels: optimization
• Assignee: Tilman Hausherr
• Reporter: Tilman Hausherr
• Created: 01/Mar/19 07:27
• Updated: 12/Apr/19 14:39
• Resolved: 02/Mar/19 11:16

Description

As reported by slavago in TIKA-2832. File is confidential but I have it. Initial findings:

• File is AES256 encrypted with empty user password
• File has about 1000 objects
• File is a tagged PDF
• HashMap in SecurityHandler grows to 100000?!
• Using an IdentityHashMap speeds up the process dramatically (parsed in a few seconds), and it may also be a better solution that what was done in PDFBOX-4453

Todo:

• Read description of IdentityHashMap again
• Find out why the HashMap grows so much. Could it be that identical objects are stored twice? Or does the file have many direct objects?

Issue Links

• relates to: TIKA-2832 Very slow large PDF text extraction
• relates to: PDFBOX-4453 Encrypted string not decrypted