SynZIP

tueddy · 2010-08-24 13:36:56

Hi AB,

I failed to create a ZIP-archive with (WinZip compatible) AES encryption.
I wonder if it's possible with your component.
Algo: 7=AES+Zip-chunked? Is it WinZIP compatible?
Do you have an idea or code snippet?

Thanks and best regards
Dirk Carstensen

ab · 2010-10-03 09:00:32

No, I'm sorry, it's not winZip compatible.
Because I was not able to find low level information of this format.
So I implemented our own, with some other compression schemes (LZO or LZ).

But it's only used internally, not fully tested/published yet.
Sorry.

If you have some ideas or resources about AES WinZip format, it could be interesting.

tueddy · 2010-10-04 07:34:30

Hi AB,

thanks for your reply! I found a description of the ZIP file format including AES encryption here:
ftp://ftp.info-zip.org/pub/infozip/doc/ … latest.zip
And a detailed documentation page here:
http://www.winzip.com/aes_info.htm

Best regards
Dirk Carstensen

ab · 2010-10-04 10:45:13

OK thanks for the info

I'll take a look and try to see what's there.

ab · 2010-10-05 05:51:40

I need to change:
- The way the special compression types are stored in the file;
- The encryption mode, which must be CTR;
- So I need to include CTR to the SynCrypto unit.

tueddy · 2010-10-05 18:22:23

CTR?

best regards
Dirk

ab · 2010-10-05 19:11:38

See http://en.wikipedia.org/wiki/Block_ciph … _operation

tueddy · 2010-10-06 14:44:56

Hi AB,

thanks for the info!
Best regards
Dirk

tueddy · 2011-02-26 22:47:44

Hi AB,

any news about that subject?

Best regards
Dirk

ab · 2011-02-27 08:03:44

No, I didn't work on it yet.

Are you in a hurry?
Could you try to implement it, at least a first draft, and some unitary tests?

DenisTheGreat · 2011-09-10 19:23:10

Hello, AB.

Please tell me how to add an empty folder in the archive?

Thanks in advance.

ab · 2011-09-11 06:59:25

With the current implementation, this is not possible without creating a void file in it.

In fact, the folders are not stored separately, but as part of every file name.

It may be possible to store empty folders, but you'll have to change the code.

DenisTheGreat · 2011-09-11 07:13:08

How can I do it?

Give, please, direction. Where to append/change code?

mORMot Open Source

#1 2010-08-24 13:36:56

SynZIP

#2 2010-10-03 09:00:32

Re: SynZIP

#3 2010-10-04 07:34:30

Re: SynZIP

#4 2010-10-04 10:45:13

Re: SynZIP

#5 2010-10-05 05:51:40

Re: SynZIP

#6 2010-10-05 18:22:23

Re: SynZIP

#7 2010-10-05 19:11:38

Re: SynZIP

#8 2010-10-06 14:44:56

Re: SynZIP

#9 2011-02-26 22:47:44

Re: SynZIP

#10 2011-02-27 08:03:44

Re: SynZIP

#11 2011-09-10 19:23:10

Re: SynZIP

#12 2011-09-11 06:59:25

Re: SynZIP

#13 2011-09-11 07:13:08

Re: SynZIP

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