Re: lxyssl (AES binding), CFB en

[gary ng <garyng2000@...>]

I would suggest isolate the problem to see if it is the underlying xyssl or the interface. Just put some simple printf in the c wrapper after the encryption. 

Another option is to check if the block mode works. I remeber I have implemented the cfb mode in pure lua using the more primitive block mode.

Unfortunately, I don't have a 64 bit machine to work with and cannot offer much help.


----- Original Message ----
> From: Valerio Schiavoni <valerio.schiavoni@gmail.com>
> To: Lua list <lua@bazar2.conectiva.com.br>
> Sent: Tue, June 8, 2010 6:34:31 AM
> Subject: Re: lxyssl (AES binding), CFB en
> 
> 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
<> ymailto="mailto:valerio.schiavoni@gmail.com"; 
> href="mailto:valerio.schiavoni@gmail.com";>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 > href="http://Lua.org";>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)
> $�#Z_ ��Wj{V���y6���� ��:�j� 
> d��L�������Y<�Hw�w���� ��)Mi]�ׯAA�7�+A �� 
> ���{�W��(QP
>
>
>
> On Tue, Jun 8, 2010 at 12:34 AM, 
> gary ng <> href="mailto:garyng2000@yahoo.com";>garyng2000@yahoo.com> 
> wrote:
>>
>> Which is why I said, I have no idea. The 
> following were done under linux using lua 5.1.3 and the library has been in used 
> for quite a while. I don't have 5.1.4 on this machine(it is a debian lenny) and 
> don't have the time to redo it(compile lua then lxyssl etc.) from 
> scratch.
>>
>> > require'security'
>> > 
> data=('a'):rep(8192)
>> > 
> k=security.hash.engine('md5'):digest('abcd')
>> > aes_cfb = 
> security.crypto.engine('aes_cfb',k,k)
>> > 
> e=aes_cfb:encrypt(data..'a')
>> > print(#e)
>> 
> 8193
>>
>>
>>
>>
>>
>> 
> From: Valerio Schiavoni <> href="mailto:valerio.schiavoni@gmail.com";>valerio.schiavoni@gmail.com>
>> 
> To: Lua list <> href="mailto:lua@bazar2.conectiva.com.br";>lua@bazar2.conectiva.com.br>
>> 
> Sent: Mon, June 7, 2010 3:24:25 PM
>> Subject: Re: lxyssl (AES 
> binding), CFB en
>>
>> Well:
>> Lua 5.1.4  Copyright 
> (C) 1994-2008 Lua.org, PUC-Rio
>> > require"security"
>> 
> > data=('a'):rep(8192)
>> > k = 
> security.hash.engine('md5'):digest('abcd')
>> > print(k)
>> 
> ??qLG'?$?.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..
>>
>