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\begin{verbatim}
#include <stdio.h>
#include <stdlib.h>
#include <gnutls/gnutls.h>
#include <gnutls/x509.h>
extern void print_x509_certificate_info(gnutls_session);
/* This function will print some details of the
* given session.
*/
int print_info(gnutls_session session)
{
const char *tmp;
gnutls_credentials_type cred;
gnutls_kx_algorithm kx;
/* print the key exchange's algorithm name
*/
kx = gnutls_kx_get(session);
tmp = gnutls_kx_get_name(kx);
printf("- Key Exchange: %s\n", tmp);
/* Check the authentication type used and switch
* to the appropriate.
*/
cred = gnutls_auth_get_type(session);
switch (cred) {
case GNUTLS_CRD_ANON: /* anonymous authentication */
printf("- Anonymous DH using prime of %d bits\n",
gnutls_dh_get_prime_bits(session));
break;
case GNUTLS_CRD_CERTIFICATE: /* certificate authentication */
/* Check if we have been using ephemeral Diffie Hellman.
*/
if (kx == GNUTLS_KX_DHE_RSA || kx == GNUTLS_KX_DHE_DSS) {
printf("\n- Ephemeral DH using prime of %d bits\n",
gnutls_dh_get_prime_bits(session));
}
/* if the certificate list is available, then
* print some information about it.
*/
print_x509_certificate_info(session);
} /* switch */
/* print the protocol's name (ie TLS 1.0)
*/
tmp = gnutls_protocol_get_name(gnutls_protocol_get_version(session));
printf("- Protocol: %s\n", tmp);
/* print the certificate type of the peer.
* ie X.509
*/
tmp = gnutls_certificate_type_get_name(
gnutls_certificate_type_get(session));
printf("- Certificate Type: %s\n", tmp);
/* print the compression algorithm (if any)
*/
tmp = gnutls_compression_get_name( gnutls_compression_get(session));
printf("- Compression: %s\n", tmp);
/* print the name of the cipher used.
* ie 3DES.
*/
tmp = gnutls_cipher_get_name(gnutls_cipher_get(session));
printf("- Cipher: %s\n", tmp);
/* Print the MAC algorithms name.
* ie SHA1
*/
tmp = gnutls_mac_get_name(gnutls_mac_get(session));
printf("- MAC: %s\n", tmp);
return 0;
}
\end{verbatim}
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