int gnutls_dh_get_prime_bits(gnutls_session_t session);
ARGUMENTS
gnutls_session_t session
is a gnutls session
DESCRIPTION
This function will return the bits of the prime used in the last
Diffie-Hellman authentication with the peer. Should be used for
both anonymous and ephemeral Diffie-Hellman. Note that some
ciphers, like RSA and DSA without DHE, does not use a
Diffie-Hellman exchange, and then this function will return 0.
RETURNS
The Diffie-Hellman bit strength is returned, or 0 if no
Diffie-Hellman exchange was done, or a negative error code on
failure.