fix: ppt file with pictures #35
Conversation
|
@guillenotfound It's possible, I used WPS to decrypt the encrypted file you gave me, and after I decrypted it, I got a different 'Pictures' stream in the file than when it was encrypted, so it's possible that something was done here. |
|
@guillenotfound #19 This issue mentions the decryption of ppt Pictures stream, there is a partial implementation of golang, maybe it will help you, if it can inspire you to finish decrypting ppt Pictures stream, PR will be perfect. |
|
Would it be possible to guillenotfound:patch-2 branch to synchronize the latest main branch first? I'm afraid that there will be a conflict during the PR merge. |
Done! I cannot promise I'll be able to add images support, but if we get a complete code snippet I'll be happy to try :) At least this one will allow rendering in some platforms even if we don't see the images (we'll have parity with Python script) |
|
@guillenotfound v0.0.16 Released |
As per the reference implementation in Python: https://github.com/nolze/msoffcrypto-tool/blob/85ff05be8c057dac51fcd5b12f15fc438df5f1ab/msoffcrypto/format/ppt97.py#L798
The original streams are copied and replaced with the newly decrypted ones.
With this fix in place I'm able to visualize the file in pdftron, but this fix won't fix the fact that the original file and the resulting one will be different and we won't be able to visualize images in the decrypted ppt file, that's something I don't know how to fix, I guess we need to apply decryption in chunks for the pictures stream?
pwd:
Password@123ppt.zip