This covers the normal use-case where clients generate keys
locally on their device and notify the server of their new/updated keys.
The server verifies Preshared and Public keys independently of each
other. Should a client generate a new tunnel which lacks a PSK and send
only a Public key to the server (admin) where the earlier server created
profile has a Preshared key, the server admin/user must determine the
course of action:
keep or remove the PSK.
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