Function safe_app::ffi::crypto::generate_nonce

#[no_mangle]
pub unsafe extern "C" fn generate_nonce(
    user_data: *mut c_void, 
    o_cb: extern "C" fn(_: *mut c_void, _: FfiResult, _: *const AsymNonce)
)

Generates a unique nonce and returns the result.

Callback parameters: user data, error code, nonce