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<p style="margin: 10px 0 0 0">Looks like the most obvious approach here is to special-case the notion of "encrypt to self".</p>
<p style="margin: 10px 0 0 0">I'm thinking to enhance <tt>AbstractEncryptAction</tt> like so:<br /> 1) Add an encryptToSelf <tt>Predicate<ProfileRequestContext></tt><br /> 2) Add a <tt>Function<ProfileRequestContext>, EncryptionParameters></tt> or probably a <tt>Function<ProfileRequestContext>, List<EncryptionParameters>></tt>. The latter would be necessary to support encrypt-to-self with <b>all</b> the IdP's current encryption creds rather than just 1.</p>
<p style="margin: 10px 0 0 0">The predicate to support this case would then be wired on <tt>EncryptNameIDs</tt> as the new {{<br /> IssuingDelegatedAssertionPredicate}}.</p>
<p style="margin: 10px 0 0 0">The function would just use the IdP encryption creds (injected as bean 'shibboleth.DefaultEncryptionCredentials') + a enc params resolver. Since the IdP isn't an RP, will need to have an <tt>EncryptionConfiguration</tt> bean in user-space config for the encrypt-to-self config.</p>
<p style="margin: 10px 0 0 0">Then <tt>AbstractEncryptAction</tt> just resolves the encrypt-to-self parameters and adds those to the encrypter that it constructs in <tt>doPreExecute</tt>.</p>
<p style="margin: 10px 0 0 0">We currently only care about encrypt-to-self for NameIDs, but doing it this way means we also get encrypted Assertion and Attribute support for free.</p>
<p style="margin: 10px 0 0 0">The other option I considered is populating the encryptToSelf params on the <tt>EncryptionContext</tt>. That seems a lot harder to do, more machinery in the populate action, etc. But also doesn't quite fit, since the working idea is that that is RP-specific, so if we ever do multi RP and multicast, it doesn't make sense to have multiple, disparate encryptToSelf data sets. I think... </p>
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