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wgengine/magicsock: stop depending on UpdateDst in legacy codepaths.

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This makes connectivity between ancient and new tailscale nodes slightly
worse in some cases, but only in cases where the ancient version would
likely have failed to get connectivity anyway.

Signed-off-by: David Anderson <danderson@tailscale.com>
This commit is contained in:
David Anderson
2021-01-12 15:28:33 -08:00
committed by Dave Anderson
parent 017dcd520f
commit 22507adf54
6 changed files with 155 additions and 62 deletions
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9
types/key/key.go
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@@ -82,6 +82,15 @@ func (k Private) Public() Public {
return Public(pub)
}
func (k Private) SharedSecret(pub Public) (ss [32]byte) {
apk := (*[32]byte)(&pub)
ask := (*[32]byte)(&k)
//lint:ignore SA1019 Code copied from wireguard-go, we aim for
//minimal changes from it.
curve25519.ScalarMult(&ss, ask, apk)
return ss
}
// NewPublicFromHexMem parses a public key in its hex form, given in m.
// The provided m must be exactly 64 bytes in length.
func NewPublicFromHexMem(m mem.RO) (Public, error) {