12 replies to this topic

[wilcomega]

i saw some encryption programs for lua on lua-users.org but they all require external C libraries. and i dont think CC can load those guys.
so if anyone has an encryption and decryption api ready or know one (with passwords) then i would like to use it!

thx in advance />
wilcomega

[GopherAtl]

tomas1996's StringUtils includes some password-based encryption/decryption I think? It' a bit outdated now - some of it's functions are in the native stringutils library, and it's lua-based bitwise operations ought to be removed and the algos written to use the java-based ones in the new java-based bitwise api for cc 1.42+, but it's still usable as-is I assume. Not tried the encryption, only used the SHA1 function, but it worked well enough.

Link to his thread here http://www.computerc...ring-utils-api/

[Cranium]

What would be the application of this encryption? If it's simple, like a keycard system, you can use math.randomseed() to do a little jiggery... I'll come up with something a little easier to look at than just ideas soon...

[Cranium]

Strike that...I know nothing of what I am talking about..... Using math.randomseed() is super difficult to implement. Using someone else's pseudo-random number generator is not really a good idea.

[jag]

Found a way: Hz5zR22t

[MysticT]

jag_e_nummer_ett, on 01 October 2012 - 10:18 PM, said:

Found a way: Hz5zR22t

Well, it would be better to use a simple xor encryption:

local function xorEncrypt(data, key)
    local klen = #key
    local s = ""
    for i = 1, #data do
        s = s..string.char(bit.bxor(string.byte(data, i), string.byte(key, i % klen)))
    end
    return s
end

The same function works to encrypt and decrypt.

[Cranium]

That's more of a cipher than a true encryption... isn't it?

[MysticT]

Cranium, on 01 October 2012 - 10:32 PM, said:

That's more of a cipher than a true encryption... isn't it?

Cipher = program that encrypts. />
It's not a good algorithm and it's easy to break, but should be enough for most CC uses.

[Cranium]

Meh, I suppose.
Gonna try to implement this into some sort of keycard system.

[PixelToast]

i made a super secure one here

[jag]

MysticT, on 01 October 2012 - 10:29 PM, said:

jag_e_nummer_ett, on 01 October 2012 - 10:18 PM, said:

Found a way: Hz5zR22t

Well, it would be better to use a simple xor encryption:

local function xorEncrypt(data, key)
	local klen = #key
	local s = ""
	for i = 1, #data do
		s = s..string.char(bit.bxor(string.byte(data, i), string.byte(key, i % klen)))
	end
	return s
end

The same function works to encrypt and decrypt.

Well, I don't know anything about encrypting, I just fount that on the interwebs

[Cranium]

jag_e_nummer_ett, on 01 October 2012 - 11:40 PM, said:

Well, I don't know anything about encrypting, I just fount that on the interwebs

Hooray for Google!!!

[jag]

Cranium, on 01 October 2012 - 11:48 PM, said:

Hooray for Google!!!

Google is your friend! (Not Yahoo or Bing!!)
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