Re: lxyssl (AES binding), CFB en

[Valerio Schiavoni <valerio.schiavoni@...>]

I finally have an explanation of what it's going on here.

I've tested the code on several architectures:

Ubuntu 10.4 32bit
Ubuntu 10.4 64bit
Debian Lenny 32bit
Mac OSX 10.6.3 64bit

And the result is always the same: it works fine on 32bit machines, it
doesn't work (encryption returns empty string) on 64bit machines.

I guess to solve this problem some C hacking on the xyssl lib must be done?

On Tue, Jun 8, 2010 at 11:54 AM, Valerio Schiavoni
<valerio.schiavoni@gmail.com> wrote:
> Hello Gary,
> I reproduced your environment via a virtual machine. Installed lenny,
> lua 5.1.3, xyssl, lxyssl,and run.. and indeed, in this context, it
> works.
>
> What can be possibly be? Which are the differences between lua 5.1.3
> and 5.1.4 ??
>
> lua -llxyssl
> Lua 5.1.3  Copyright (C) 1994-2008 Lua.org, PUC-Rio
>> require"lxyssl"
>> key="abcdabcdabcdabcd"
>> iv=lxyssl.hash('md5'):digest(key)
>> print(iv)
> )%�,���������F
>> data=('a'):rep(8193)
>> e=lxyssl.aes(key):cfb_encrypt(data,iv)
>> print(#e)
> 8193
>> print(e)
> $�#Z_ ��Wj{V���y6���� ��:�j� d��L�������Y<�Hw�w���� ��)Mi]�ׯAA�7�+A �� ���{�W��(QP
>
>
>
> On Tue, Jun 8, 2010 at 12:34 AM, gary ng <garyng2000@yahoo.com> wrote:
>>
>> Which is why I said, I have no idea. The following were done under linux using lua 5.1.3 and the library has been in used for quite a while. I don't have 5.1.4 on this machine(it is a debian lenny) and don't have the time to redo it(compile lua then lxyssl etc.) from scratch.
>>
>> > require'security'
>> > data=('a'):rep(8192)
>> > k=security.hash.engine('md5'):digest('abcd')
>> > aes_cfb = security.crypto.engine('aes_cfb',k,k)
>> > e=aes_cfb:encrypt(data..'a')
>> > print(#e)
>> 8193
>>
>>
>>
>>
>>
>> From: Valerio Schiavoni <valerio.schiavoni@gmail.com>
>> To: Lua list <lua@bazar2.conectiva.com.br>
>> Sent: Mon, June 7, 2010 3:24:25 PM
>> Subject: Re: lxyssl (AES binding), CFB en
>>
>> Well:
>> Lua 5.1.4  Copyright (C) 1994-2008 Lua.org, PUC-Rio
>> > require"security"
>> > data=('a'):rep(8192)
>> > k = security.hash.engine('md5'):digest('abcd')
>> > print(k)
>> ??qLG'?$?.3
>> > aes_cfb = security.crypto.engine('aes_cfb', k, k)
>> > e=aes_cfb:encrypt(data.."a")
>> > print(e)
>> > print(#e)
>> 0
>> I don't understand..
>>
>