Function safe_app::ffi::crypto::app_pub_enc_key

#[no_mangle]
pub unsafe extern "C" fn app_pub_enc_key(
    app: *const App, 
    user_data: *mut c_void, 
    o_cb: extern "C" fn(user_data: *mut c_void, result: *const FfiResult, pk_h: EncryptPubKeyHandle)
)

Get the public encryption key of the app.

Callback parameters: user data, error code, public encrypt key handle