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Add/Support Key Exchange Algorithm ecdh-sha2-nistp521 and curve25519-sha256

Add/Support Key Exchange Algorithm ecdh-sha2-nistp521 and curve25519-sha256

This is supported by WeOnlyDo but not NCM.

https://www.weonlydo.com/SSHServer/Help/wodSSHD-object-properties-KeyExchangeList-property.html