Support WPA2-PSK

[brentru]

It may be possible to do this through specifying a key_mgmt field like the Raspberry Pi wifi_supplicant.conf file.

key_mgmt: Specifies the key management protocol, which is typically WPA-PSK for WPA2 networks.

network={
    ssid="YourNetworkSSID"
    psk="YourNetworkPassword"
    key_mgmt=WPA-PSK
}

We do need to check what encryption method is used for the psk field.

[brentru]

We also need to check if this is possible with arduino-esp32 or the ESP-IDF

[brentru]

Additionally, we can use setting key_mgmt=NONE for networks without a psk

[brentru]

https://linux.die.net/man/8/wpa_passphrase
https://www.rfc-editor.org/rfc/rfc2898#appendix-A.2
https://github.com/aosp-mirror/platform_external_wpa_supplicant/blob/master/wpa_passphrase.c

[tyeth]

I'm pretty sure it's not really encrypted, more like obfuscated, using a salted hash based on some machine salt.
The PSK / hash actually equates to the real password, you can literally type it in on your phone to join the same network.