I am adding Ripple to my HD Wallet. To be compatible with other HD wallet, I need to use bip32/bip44 paths. So I will use such approaches: https://github.com/iancoleman/bip39 https://github.com/you21979/node-ripple-bip32

But these libraries generate private key that is different from Ripple's secret key. Public/private key pairs are just like the bitcoins addresses. How can I generate secret key from this private key?