Reject unsupported key types instead of failing #352
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Currently russh doesn't support ED25519/ECDSA-SK keys, but OpenSSH will attempt to use them anyway. Key parse will then fail, killing the session. This should be treated as-if auth_publickey_offered rejects the key.
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Currently russh doesn't support ED25519/ECDSA-SK keys, but OpenSSH will attempt to use them anyway. Key parse will then fail, killing the session.
This should be treated as-if auth_publickey_offered rejects the key.