Function hide_challenge_answer 

#[unsafe(no_mangle)]
pub unsafe extern "C" fn hide_challenge_answer(
    identity: *const HideSigningIdentity,
    challenge: *const u8,
    challenge_len: usize,
    out: *mut HideBuffer,
) -> i32

Answers a challenge, producing a signature over it.

Safety

All pointers must be valid for the stated lengths.