pub unsafe extern "C" fn hmac_drbg_seed( ctx: *mut hmac_drbg_context, md_info: *const md_info_t, f_entropy: Option<unsafe extern "C" fn(arg1: *mut c_void, arg2: *mut c_uchar, arg3: size_t) -> c_int>, p_entropy: *mut c_void, custom: *const c_uchar, len: size_t) -> c_int
