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This PR builds on PR #173 and completes the remaining construction and runtime processing logic in `Section 8` of the Mix Protocol RFC. It finalizes the last steps of packet construction (`Section 8.5.2 step 3. e–f`) and introduces the complete mix node handler logic in `Section 8.6`, including intermediary and exit processing. It clearly separates construction, role determination, and processing logic. ### Changes Introduced in This PR - **8.5.2 Construction Steps (Final Steps Added)** - Sphinx packet construction - [x] Assemble Final Packet - [x] Transmit Packet - **8.6 Sphinx Packet Handling** - [x] **8.6.1 Shared Preprocessing** - Derives session key, validates replay tag and MAC, decrypts header/payload - [x] **8.6.2 Node Role Determination** - Inspects decrypted header prefix and padding to classify node as intermediary or exit - [x] **8.6.3 Intermediary Processing** - Parses next hop address and mean delay - Updates ephemeral key and routing fields - Samples actual forwarding delay and transmits packet - Erases all temporary state. - [x] **8.6.4 Exit Processing** - Verifies payload padding and extracts destination address - Parses and validates application-layer message - Hands off to Exit Layer along with origin protocol codec and destination address ### Highlights - Explicit role determination via zero-delay and padding inspection - Fully decoupled construction and handling logic - Forwarding delay behavior updated: - Sender selects per-hop mean delay - Mix node samples actual delay using pluggable distribution --------- Co-authored-by: kaiserd <1684595+kaiserd@users.noreply.github.com>
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