ecdh-sha2-nistp{256,384,521} kex support #282
Merged
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Adds support for ecdh-sha2-nistp{256,384,521} key exchange algorithms using the elliptic-curve, p256, p384, and p521 crates.
Intentionally avoids adding these to the preferred Kex list as the security of these curves is considered controversial. Users would need to explicitly use the kex via config
Resolves #210