Hi,
Unfortunately, the LPCOpen package only provides the basic http server function, but it does not support secure feature.
The SDK package for LPC54xxx provides the mbedtls example, I suppose that you can either port it to LPC17xx or change another processor.
xiangjun_rong_0-1700444134666.png
This is the SDK package website:
https://mcuxpresso.nxp.com/en/welcome
Hope it can help you
BR
XiangJun Rong