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AppGameKit Classic Chat / Encrypt Media Folder

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Behdadsoft
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Posted: 15th Feb 2016 10:54
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Hi.

If I want Encrypt media folder for secure files, how can do it?

Thanks.
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Markus
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Posted: 15th Feb 2016 11:18
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you can encode the files with a self made tool,
decode at loading temporary or decode in memblocks CreateMemblockFromFile,CreateImageFromMemblock,CreateSoundFromMemblock
AGK (Steam) V2.0.16 : Windows 10 Pro 64 Bit : AMD (15.30.1025) Radeon R7 265 : Mac mini OS X 10.10 (Yosemite)
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hakimfullmetal
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Posted: 15th Feb 2016 12:39
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Is there any other programs outside of AppGameKit that uses memblocks?

I've never saved a file as a memblock. Would it have any extension to it (like .mem)?
Or it's just saved using a file name that we specify (without any extension)?
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Battoad
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Posted: 15th Feb 2016 13:12
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Here are 2 areas that you can try with regard to code snippets for encryption:

1) In the V2 Feature Requests sticky, on page 2 there is some code plus useful posts by Naphier.

2) In the Newsletter no. 151, Sept 2015, Steve Vink posted an article on encryption/decryption with example code.

These should get you started.
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Markus
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Posted: 15th Feb 2016 13:24
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Quote: "Would it have any extension to it (like .mem)?"

CreateFileFromMemblock
CreateMemblockFromFile

i would try .dat = Data or .bin = binary
not all extensions can used for android from within agk.

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Behdadsoft
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Posted: 27th Feb 2016 18:46
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Thanks all.

I don't understand one thing. when AppGameKit make an APK file , we can change .APK to ZIP and seen all contents in media folder. I need know when we changed APK to ZIP, (Images, Sounds, ...) are encrypted or not?

Thanks.
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Digital Awakening
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Posted: 27th Feb 2016 18:53
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There is no encryption in APK and ZIP files.
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Behdadsoft
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Posted: 27th Feb 2016 19:16 Edited at: 27th Feb 2016 19:16
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Quote: "There is no encryption in APK and ZIP files."


is it only for codes?

is there any way to encrypt files in AppGameKit?
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Mobiius
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Posted: 27th Feb 2016 19:27
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Quote: "is there any way to encrypt files in AppGameKit?"

Not built in.You will have to write your own encryption routine which will take in an asset, encrypt it and save it back out. Then load it back in, and decrypt it to use it.

The now defunct newsletter had an article on exactly this of you search for it.

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CJB
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Posted: 28th Feb 2016 10:38
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Quote: "is there any way to encrypt files in AppGameKit?"

Yes, but nothing built in.

Quote: "you can encode the files with a self made tool"

Quote: "You will have to write your own encryption routine"

Quote: "Steve Vink posted an article on encryption/decryption with example code"


If you convert an image to a memblock, you can apply any encryption you like, but you will have to write the code to do the encryption and decode.

Pseudo:
Loadimage
create memblock from that image
encrypt the new memblock (with your own function)
save the encrypted memblock

In your game:

Load encrypted memblock
decrypt memblock (with your own function)
create image from memblock

Hopefully we will see media folder encryption built into a future release, where can can just set a key at compile time. That would be SO nice!
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Crazy Programmer
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Posted: 28th Feb 2016 12:21
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Don't forget to delete the image after its loaded to memory
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Behdadsoft
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Posted: 29th Feb 2016 07:39
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Quote: "Don't forget to delete the image after its loaded to memory "


is your mean that after loaded to memory, before Make APK file delete Images?
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Crazy Programmer
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Posted: 29th Feb 2016 18:24
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//////////////////////////Load Bird////////////////////////////////
decryptFile("Bird1.png.enc", "Bird1.png")
BirdFrame1 = LoadImage ("Bird1.png")
DeleteFile ("Bird1.png")
//////////////////////////////////////////////////////////////////////

First you need to decrypt the memblock.
Store the image to memory
Then delete the file so its no longer in your media folder. If you do not delete the file it will be there for anyone to take.


So after its decrypted, stored and deleted you can use BirdFrame1 to create your sprites.

Bird = CreateSprite(BirdFrame1)
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Digital Awakening
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Posted: 29th Feb 2016 18:36 Edited at: 29th Feb 2016 18:36
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Quote: "Then delete the file so its no longer in your media folder."

If you use CreateImageFromMemblock() then the image is never written to the hard drive and you don't have to load or delete it.
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BatVink
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Posted: 29th Feb 2016 19:10
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https://www.thegamecreators.com/pages/newsletters/newsletter_issue_151.html#10
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Behdadsoft
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Posted: 29th Feb 2016 19:15
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OK, Thanks All for help.
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Behdadsoft
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Posted: 29th Feb 2016 19:16 Edited at: 29th Feb 2016 19:19
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OK, Thanks All for help.

Sorry for two post, My internet have problem.
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Shizki
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Posted: 1st Mar 2016 23:33
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I really think this should be built-in as standard, where all assets are automatically encrypted/decrypted.

It would also be really useful if the Export Settings were saved when exporting to iOS/Android.
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blink0k
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Posted: 2nd Mar 2016 01:51 Edited at: 2nd Mar 2016 08:28
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SEE ATTACHED
I made a couple of encryption functions to convert an image file (.png etc) to an encrypted file (That can be loaded directly into an image)
It uses integers to xor the memblock so it's fairly fast (Not awesome but decent)
You would still need to zip your encrypted images as they end up quite large. However the combination of encryption+agk's internal image format makes for a decent encryption i think

Right now it uses SetRawWritePath(GetReadPath()) so generated files go to the media directory.

Would be great if you guys could give it a thorough testing

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Behdadsoft
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Posted: 2nd Mar 2016 05:18
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if TGC add this feature to AppGameKit it make useful.
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nz0
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Posted: 3rd Mar 2016 17:37
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I've developed a complete system for loading encrypted, compressed assets (except streaming ones).

Also, I made a tool to generate a single data file which you deploy with your app. It's all a bit rough at the moment, but I would like to release it at some point.
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