how to send arbitrary data in supplemental data message

[Nikos Mavrogiannopoulos]

Carolin Latze wrote:

Here is the trouble maker:
 _gnutls_buffer_append(buf,
                session->security_parameters.extensions.aik_sent->data,
                (uint8_t)
session->security_parameters.extensions.aik_sent->size);

Remove the cast (uint8_t) to solve the issue. You're are effectively
doing a (mod 256) to the data size.


regards,
Nikos


> Hi Nikos,
> 
> On 05/30/2010 01:05 PM, Nikos Mavrogiannopoulos wrote:
>> LATZE Carolin wrote:
>>   
>>> Hi everybody,
>>>
>>> I ran again into problems with the supplemental data messages. I
>>> tried to copy a certificate into the buffer of type gnutls_buffer and
>>> do not manage to send all 1314 bytes of the certificate. Instead it
>>> sends only 41 bytes. I tried it with another certificate which
>>> resulted in 65 bytes sent. This is pretty strange. I expected the
>>> buffer to stop at a \0 character in the signature, but that does not
>>> seem to be the case since strlen of the original data results in the
>>> correct length of 1314. Any ideas?
>>>
>>> In order to simplify debugging, I copied my gnutls version including
>>> the tls-tpm extension (not finished yet, but does not cause crashes
>>> :-)) onto a server:
>>> http://diuf.unifr.ch/people/latzec/gnutls-CL-28052010.tar.gz
>>>
>>> Furthermore, I uploaded my little sample program as well:
>>> http://diuf.unifr.ch/people/latzec/sample.tar.gz
>>>
>>> I would be happy for any hints or ideas since I am clueless at the
>>> moment.
>>>      
>> Could you use debugging output with
>>    gnutls_global_set_log_function (tls_log_func);
>>    gnutls_global_set_log_level (level);
>> ?
>>
>>    
> Oh sorry, I did that already (with level 3), but forgot to add the file.
> You find it here:
> 
> http://diuf.unifr.ch/people/latzec/out
> 
> Thats the output of the client who is supposed to send the supplemental
> data.
> 
> Carolin
> 
>> Level 2 should be sufficient.
>>
>> regards,
>> Nikos
>>
>>
>>
>>    
>