[PATCH] Implement reading keys from stdin.

[Hristo Venev]

On Sat, 2020-02-08 at 23:20 +0100, Jason A. Donenfeld wrote:
> Trying to get a handle on the use case for this.

I am working on a program [1] that configures a WireGuard interface by
invoking `wg`. Generally there are multiple peers, and some of them may
have preshared keys.

Currently the most reasonable way to pass keys is to write each one to
a temporary file. I think passing all of them over stdin is nicer.

[1] https://git.venev.name/hristo/wgconfd/
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