End-Cell: seal + rail verify (pinned-key, fail-closed)#9
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- crypto: split_key_pieces/combine_key_pieces (byte-identical to node + verifier). - rail.py: fetch_rail_piece + pinned Ed25519 verify (cryptography) — fail-closed. - client: create_end_cell_intent (ShareA + keyhalve+platform pieces); verify_intent end_cell branch fetches platform shares (API) + rail share (rail), XOR-combines. rail_base_url / rail_public_key_spki client options. - tests: split/combine round-trip; rail verify, tamper/non-pinned/wrong-holder/404/409 fail-closed. 7 end-cell tests pass; suite green (pre-existing numpy-binding env failures unrelated). HOLD publish until the End-Cell cutover. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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Adds full End-Cell support to the python SDK (it previously had only split_key).
crypto:split_key_pieces/combine_key_pieces— byte-identical to the node SDK + website verifier.rail.py:fetch_rail_piece+ pinned Ed25519 verification (viacryptography); fails closed on missing/revoked/bad-sig/non-pinned-key.client:create_end_cell_intent(Model A — ShareA + [keyhalve, platform]);verify_intentfetches platform share(s) from API + rail share from KeyHalve rail and XOR-combines.rail_base_url/rail_public_key_spkioptions.🤖 Generated with Claude Code