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I know TLS normally uses a x.509 certificate. But is it possible to use a non-x.509 cert to do TLS if both the server and client understand the format of that certificates?

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Yes, you can.

The server_certificate_type and client_certificate_type extensions may be used to negotiate the usage of alternative certificate types. See the TLS Certificate Type registry for possible values. Values in the range 224-255 are reserved for private use as per RFC7250.

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