Provided by: gnutls-doc_3.0.11+really2.12.14-5ubuntu3_all
gnutls_dh_get_prime_bits - API function
#include <gnutls/gnutls.h> int gnutls_dh_get_prime_bits(gnutls_session_t session);
gnutls_session_t session is a gnutls session
This function will return the bits of the prime used in the last Diffie-Hellman key exchange 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 key exchange, and then this function will return 0.
The Diffie-Hellman bit strength is returned, or 0 if no Diffie-Hellman key exchange was done, or a negative error code on failure.
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The full documentation for gnutls is maintained as a Texinfo manual. If the info and gnutls programs are properly installed at your site, the command info gnutls should give you access to the complete manual.