new: UtlsPreSharedKeyExtension #230
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In `u_pre_shared_key.go`, create `PreSharedKeyExtension` as an interface, with 3 implementations: - `UtlsPreSharedKeyExtension` implements full support for `pre_shared_key` less resuming after seeing HRR. - `FakePreSharedKeyExtension` uses CipherSuiteID, SessionSecret and Identities to calculate the corresponding binders and send them, without setting the internal states. Therefore if the server accepts the PSK and tries to resume, the connection fails. - `HardcodedPreSharedKeyExtension` allows user to hardcode Identities and Binders to be sent in the extension without setting the internal states. Therefore if the server accepts the PSK and tries to resume, the connection fails. TODO: Only one of FakePreSharedKeyExtension and HardcodedPreSharedKeyExtension should be kept, the other one should be just removed. We still need to learn more of the safety of hardcoding both Identities and Binders without recalculating the latter.
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Implement
UtlsPreSharedKeyExtensionto enable REAL PSK resumption.Redesign
FakePreSharedKeyExtensionandHardcodedPreSharedKeyExtensionto mimic PSK extension.Successfully merging this change into master should close issues #107 and #182.
Related to #63.
This PR is based off branch:x25519kyber768. Successfully merging this PR into master should close #223.