> Is it possible to perform the shortened (session resumption)
> handshake without reconnecting the socket? TLS 1.2 RFC 5246 states:

Yes.

> [ClientHello]
> The session identifier MAY be from an earlier connection, this
> connection, or from another currently active connection. The second
> option is useful if the client only wishes to update the random
> structures and derived values of a connection, and the third option
> makes it possible to establish several independent secure connections
> without repeating the full handshake protocol.
>
> So it should be possible, but the only handshake related functions I
> have found in OpenSSL are SSL_renegotiate and SSL_get_session/
> SSL_set_session. The first always performs a full handshake and the
> latter requires a new SSL object.

The new SSL object can become associated with the resumed session. An SSL
object is not a session, it's a handle to a session. An 'SSL' structure
contains a pointer to an SSL_SESSION. The SSL_SESSION is reference counted.
The "SSL_SESSION" object contains the information required to re-establish
the connection without a new handshake.

DS


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