Edited: Tested with iPhone 4... Input cipher text of 1280 characters. Take around 25 seconds. Unacceptable speed for general uses.
1) It requires Lua 5.2 feature which does not seem to be in Corona
Solution: Download LuaBit v0.4 and integrate it... You will need to make a mapping to allow API call to the proper place
2) Next you need to get Base64 library -- grab it here https://gist.github.com/2563975 -- It initially made to allow passing it over the URL (using '-' and '_' instead of '+' and '/') So, I change them to the latter one.
3) For AESLua, by default, it uses AES-128, CBC, some kind of random padding
http://www.unsw.adfa.edu.au/~lpb/src/AEScalc/AEScalc.html
http://www.tools4noobs.com/online_tools/decrypt/
Here are the things to do
3.1) In pwInKey function, comment the line out
password = ciphermode.encryptString(pwBytes, password, ciphermode.encryptCBC);
3.2) In util.padByteString function, change it to
local paddingLength = math.ceil(#data/16)*16 - #data;
local padding = "";
local paddingValue = string.char ( paddingLength ) -- PKCS7 padding
for i=1,paddingLength do
padding = padding .. paddingValue;-- PKCS7 padding
end
return data .. padding;
4) Set up web server for testing, you will need php / mcrypt mod to test.
5) Creating a php for testing... here is a code
Now, my plain text below is "1234567890123456ss@#%de".
$data = 'dXzNDNxckOrb7uz2ON0AAJp4BXgkYewblTNWBSAQSEw=';
$key128 = '1234567890123456';
$iv = '\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0';
echo mcrypt_decrypt(MCRYPT_RIJNDAEL_128, $key128, base64_decode($data), MCRYPT_MODE_CBC, $iv)
?>
That's it. The encryption backward to client machine should be a piece of cake. =)
*** By using these library, the user should be aware of the fact that Lua's performance is still far from native code. You may not want to use this algorithm to encrypt a large volume of data.
按照他的办法，一切都OK了。但是有以下几点需要说明以下：（本人摸索的）
1.利用CBC模式加密的字符串的key必须是16位，否则PHP无法解密！
2.明文字符串的必须把key作为前缀加进去
3.上面文章中没有把unpack函数写出来，本人查阅了一些资料，补充了，否则aeslua无法正常解密了！
util.lua中的下面这个函数改为如下：
function public.unpadByteString(data)
local padLength = tonum((string.byte(data, #data)));
return string.sub(data,1, #data-padLength) --unpack
end
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