eriptic / uoscore-uedhoc

C implementations for constrained (and non-constrained) devices of the IETF protocols OSCORE and EDHOC
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Feat: Added support for multiple OSCORE interactions #46

Closed mopsiok closed 1 year ago

mopsiok commented 1 year ago

Prior to this change, only one interaction was supported by single OSCORE context. This resulted in invalid values for request_piv and request_kid fields when one than one interaction were active.

Example behavior: when the client subscribed for notifications, they only got proper values of the fields when no other communication was performed inbetween. If any request was received by the server, request_piv and request_kid fields were overwritten with new values, and next notifications used them instead of the values from the initial subscription request.

The changes introduced a dictionary-like structure to properly store, read and update valid values for multiple interactions. It was then integrated with the overall encryption and decryption flow.