About Encryption and Descryption

[mrmacadamia]

I use windows xp japanese I'm trying to write encryption/descryption code.

I tried with simple encrypt function that included by default Autoit also use the encryption function that I found within this forum. I tried to encrypt password or text or date. It can encrypt but it still doesn't decrypt correctly.

Maybe it is a bug or not perform correctly on Japanese windows.

Does anyone have this problem?

[jchd]

Here's a working example.

Try it as I know it works. You may need to have your input script encoded in UTF-8 with BOM to have some older calls (ANSI) work with Big5 codepages. I believe UTF-8 to be more consistent worldwide. Also be sure you're running the latest release of AutoIt.

Forget what I wrote, I was confused with another function. This version will not work with anything else than single byte ANSI. I'll look if you can do something to workaround.

Edited April 5, 2010 by jchd

[jchd]

I'd recommend switching to using the Crypt.au3 functions as these will work with plain Unicode strings. This UDF uses the Windows cryptography functions, _ways_ faster (and more robust) than AutoIt RC4 loops of String(En|De)crypt.

Look in the help file under UDF > Encryption Management. It's now 4:45 AM and I need to have some rest, sorry that I can help you more at this time.

[darkjohn20]

#include <Crypt.au3>

$Message = "Hello mrmacadamia"
$Password = "This is darkjohn20"

_Crypt_Startup()
$Key = _Crypt_DeriveKey($Password, $CALG_RC4)

$Encrypted = _Crypt_EncryptData($Message, $Key, $CALG_USERKEY)
ConsoleWrite("Encrypted: " & $Encrypted & @CRLF)

_Crypt_DestroyKey($Key)

$Decrypted = _Crypt_DecryptData($Encrypted, $Password, $CALG_RC4)
ConsoleWrite("Decrypted: " & BinaryToString($Decrypted) & @CRLF)

_Crypt_Shutdown()

Small example.