Some AES Encrypted Files extract to a zero-length file

[south37]

While archiving some emails to upload to the Cloud as encrypted archives, I noticed that when testing the archive, I could not correctly extract the original file. The file would be created but be zero bytes long. The text files I was compressing were approx 100MB long and the archive a zip file with AES128 encryption.

The issue seems to be with AES encryption (128 192 and 256 bit), but the PK 2.04g encryption seems to allow proper file extraction.

I managed to re-produce the issue with an 800k text file that contains random characters; this when encrypted with AES128 would extract to a zero-length file. However a 40MB file containing only repeated “1234567890ABCDEFGHIJKLMNOPQRSTUVWXYZ” strings (which compresses to 233kB) encrypts and decrypts ok.

I have only tried this with zip archives.

I am using PA version 18.00.31.

[spwolf]

@south37 said in Some AES Encrypted Files extract to a zero-length file:

While archiving some emails to upload to the Cloud as encrypted archives, I noticed that when testing the archive, I could not correctly extract the original file. The file would be created but be zero bytes long. The text files I was compressing were approx 100MB long and the archive a zip file with AES128 encryption.

The issue seems to be with AES encryption (128 192 and 256 bit), but the PK 2.04g encryption seems to allow proper file extraction.

I managed to re-produce the issue with an 800k text file that contains random characters; this when encrypted with AES128 would extract to a zero-length file. However a 40MB file containing only repeated “1234567890ABCDEFGHIJKLMNOPQRSTUVWXYZ” strings (which compresses to 233kB) encrypts and decrypts ok.

I have only tried this with zip archives.

I am using PA version 18.00.31.

can you please compress that file to .pa and send it over to us at support at conexware dot com. That way we can take a look at it right away.

thank you!

[south37]

@spwolf
File sent as unencrypted .pa and sample encrypted zip file

[spwolf]

Thanks for reporting this issue. At certain settings, zip file header was not set properly, hence the issue.

You can find updated version here:
https://forums.powerarchiver.com/topic/5933/fast-ring-powerarchiver-2018-18-00-37

Please check it out and let us know if it works properly now.

[south37]

@spwolf Just tested the new version with the files that were problematic and they all decrypt and extract ok.

Thanks for the fast fix on this issue.