charCodeAt()?

The book I'm currently reading raised my interest in cryptography... So I googled for some algorhythms and found quite a few. Despite having read in the forums that good encryption is kinda too much for LSL, I'd like to try to convert some of the algorhythms into LSL.
Since most of the examples I found are in Javascript, it shouldn't be that much of a problem (don't even think about telling me now that this will most likely go beyond the capabilities of LSL *s*)...

The problem I have now, is, that a lot of these Javascripts use string-operations which aren't available in LSL. One of them is charCodeAt().
I thought about making a list with the UTF-8 codes and then search this list to determine the code of a particular character. But this seems not to be a good attempt since such a list would take up a lot of memory...

Does anybody here have a better idea to achieve the functionality of charCodeAt()?

(the page I found some quite interesting code-snippets can be found here: http://www.nordwest.net/hgm/krypto/algo.htm - page is in german, though...)

I use UnicodeIntegerToUTF8 and UTF8ToUnicodeInteger found here:

That looks quite promising!

Thanks Day...

Another possibility is to use llStringToBase64() before encrypting, and llBase64ToString() after decrypting. Then you only have to deal with an alphabet of 64 symbols.

I haven't updated the functions at http://lslwiki.net/lslwiki/wakka.php?wakka=Unicode recently. The most up to date functions can be found here:
https://wiki.secondlife.com/wiki/UTF-8

If you are interested in doing cryptography I recommend you take a look at my Base64 functions, I have written functions that allow for the manipulation of bytes and dwords in base64 strings. Rarely do you want to manipulate a single byte, usually you want to fiddle with a dword or qword (which my functions also do). For speed reasons I recommend you use the Global Buffer version of the functions.

https://wiki.secondlife.com/wiki/Combined_Library#Base64_.26_Hex_Encoding

Thanks, Strife! I had a feeling you wrote those but the info wasn't there

Thanks Strife! (and everybody else who contributed)

I'll surely have a look at your functions... I'm pretty new to this so I hope I'll get the whole concept...

http://wiki.secondlife.com/wiki/XTEA_Strong_Encryption_Implementation

very slow under the LSL VM but quite usable on the Mono beta sims.

Thanks Squirrel!

But: Did you just hear my head explode?

This kinda looks like rocket-science to me... I think I need some very quiet nights with lots of caffeine to understand what's going on there...

Hell yeah. And my 31 bit modPow implementation also works in 0.2 seconds (5 seconds compiled to the normal VM; I think it used to take 45 seconds).

/54/df/140261/1.html

You may be interested to look at the hashing functions I ported to LSL...
https://wiki.secondlife.com/wiki/MD4
https://wiki.secondlife.com/wiki/MD5
https://wiki.secondlife.com/wiki/SHA1
https://wiki.secondlife.com/wiki/SHA2 (224 & 256)

They aren't part of the combined library but a yet to be released hashing library.