void gnutls_dh_set_prime_bits(gnutls_session_t session, unsigned int bits);
is a gnutls_session_t structure.
unsigned int bits
is the number of bits
This function sets the number of bits, for use in an Diffie-Hellman
key exchange. This is used both in DH ephemeral and DH anonymous
cipher suites. This will set the minimum size of the prime that
will be used for the handshake.
In the client side it sets the minimum accepted number of bits. If
a server sends a prime with less bits than that
GNUTLS_E_DH_PRIME_UNACCEPTABLE will be returned by the handshake.