pub unsafe extern "C" fn ecjpake_derive_secret( ctx: *mut ecjpake_context, buf: *mut c_uchar, len: size_t, olen: *mut size_t, f_rng: Option<unsafe extern "C" fn(arg1: *mut c_void, arg2: *mut c_uchar, arg3: size_t) -> c_int>, p_rng: *mut c_void) -> c_int