Function stackmate::derive_hardened

#[no_mangle]
pub unsafe extern "C" fn derive_hardened(
    master_xprv: *const c_char, 
    purpose: *const c_char, 
    account: *const c_char
) -> *mut c_char

Derives hardened child keys from a master xprv. Follows the BIP32 standard of m/purpose’/network’/account’. Network path is inferred from the master xprv.

Safety

• This function is unsafe because it dereferences and returns raw pointer.
• Ensure that result is passed into cstring_free after use.