Which keys are used in Client/Server Authentication?

Hi.
I am trying to understand how SunX509 algorithm works in a TLS context. When Server or Client authentication is done, which keys of the keystore are used?
I mean, when you set up your KeyStore instance, it is loaded a whole KeyStore from the filesystem, which has a lot of keys to be used. Are they all tried in order to find the key that authenticates the Client/Server, and when a key that works is found means that Client/Server is authenticated? Or a concrete key with a specific alias is used?
Do you know a doc or something similar where i can see this explanation? I haven't found this matter in JSSE API User's Guide nor in JSSE Javadocs.
Thanks!

The alias that is chosen is arbitrary and depends upon the order in which the aliases are returned via a hashtable enumeration. If you want to make sure you're using a particular aliasn you must write your own key manager, take a look at the X509KeyManager interface with methods such chooseClientAlias(), chooseServerAlias(), ...

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