SSL_CTX_set_cert_store() sets/replaces the certificate verification storage of ctx to/with store. If another X509_STORE object is currently set in ctx, it will be X509_STORE_free()ed.
SSL_CTX_get_cert_store() returns a pointer to the current certificate verification storage.
NOTES
In order to verify the certificates presented by the peer, trusted CA certificates must be accessed. These CA certificates are made available via lookup methods, handled inside the X509_STORE. From the X509_STORE the X509_STORE_CTX used when verifying certificates is created.
Currently no detailed documentation on how to use the X509_STORE object is available. Not all members of the X509_STORE are used when the verification takes place. So will e.g. the verify_callback() be overridden with the verify_callback() set via the RESTRICTIONS