Function melib::gpgme::bindings::gpgme_op_keysign

pub unsafe extern "C" fn gpgme_op_keysign(
    ctx: *mut gpgme_context, 
    key: *mut _gpgme_key, 
    userid: *const c_char, 
    expires: c_ulong, 
    flags: c_uint
) -> c_uint