[Help-gnutls] How are the PSK keys read

[Ram G]

Hello,

 

Does any body have any experience how the pre-shared keys are read from when doing a DH key exchange with PSK authentication ? Other than hard coding it into the application, what are the other sources it is read from ( database ? file ? ) and how ?

 

I have looked at the sample code provided in the examples directory. The client sample (ex-client-psk.c) assigns the pre shared key as follows:

 

const gnutls_datum_t key = { (char*) "DEADBEEF", 8 };

 

The server sample (ex-serv-psk.c) does the key assignment in the callback function pskfunc as follows:

 

  key->data = "" (4);
  key->data[0] = 0xDE;
  key->data[1] = 0xAD;
  key->data[2] = 0xBE;
  key->data[3] = 0xEF;
  key->size = 4;

 

Obviously these are hard coded values. How are the keys read in the real world ?

 

If anyone has any samples to share, I would really appreciate it.

 

I'm working on a prototype and I have to report to my boss whether we can use GnuTLS. I'm trying to assign a dynamic value to the keys but I cannot make the TLS handshake to happen.

 

Thanks and Regards

 

Ramg