Certain private keys being mangled by wg on FreeBSD

[Christian McDonald]

Hi Jason,

I've got an interesting case here. I've got what appears to be a few
private keys provided by Mullvad that are being mangled by wg(8) on
FreeBSD12.2 (pfSense 2.5.1+).

Private key ```Lm0BA4UyPilHH5qnXCfr6Lw8ynecOPor88tljLy3ALk=``` ...
becomes ```KG0BA4UyPilHH5qnXCfr6Lw8ynecOPor88tljLy3AHk=``` on wg
showconf

another example is ```zQwldrChCYP3P2fZeTtHmj3c/88hxM+TaLIq1mJ28ZY=``` turns into
```yAwldrChCYP3P2fZeTtHmj3c/88hxM+TaLIq1mJ28VY=```


I must have just gotten lucky with the keys Mullvad provided to me, as
those worked and continue to work fine for me.

ref : https://github.com/theonemcdonald/pfSense-pkg-WireGuard/issues/105

Best,

--
R. Christian McDonald
E: rcmcdonald91 at gmail.com