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Before this pull request, `wolfSSL_get_session` always returned a pointer to the internal session cache. The user can't tell if the underlying session hasn't changed before it calls `wolfSSL_set_session` on it. This PR adds a define `NO_SESSION_CACHE_REF` (for now only defined with `OPENSSL_COMPATIBLE_DEFAULTS`) that makes wolfSSL only return a pointer to `ssl->session`. The issue is that this makes the pointer returned non-persistent ie: it gets free'd with the `WOLFSSL` object. This commit leverages the lightweight `ClientCache` to "increase" the size of the session cache. The hash of the session ID is checked to make sure that the underlying session hasn't changed.
Before creating any new configure files (.conf) read the CONF_FILES_README.md