Encryption #28
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Encryption #28
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Closes #6 .
This PR adds encryption support for the saved WiFi credentials (plus anything else we decide to store). The ESP32's HMAC peripheral is used to generate an encryption key, which internally uses a 32-byte key that we'll generate per-device and burn into eFuse memory; this memory is write- and read-protected, giving us sufficient security for the stored data.
More security hardening could be done in the future, but that will most likely build on top of this base.