VintageNetWiFi.WPA2.validate_passphrase

You're seeing just the function validate_passphrase, go back to VintageNetWiFi.WPA2 module for more information.
Link to this function

validate_passphrase(password)

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Specs

validate_passphrase(String.t()) :: :ok | {:error, invalid_passphrase_error()}

Validate the length and characters of a passphrase

A valid passphrase is between 8 and 63 characters long, and only contains ASCII characters (values between 32 and 126, inclusive).