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feat: U5 land deterministic chacha20 KAT (RFC 8439 2.4.2)

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- test/gen_chacha_kat.py emits KAT from RFC 8439 section 2.4.2 mapped to the impl's 64+64 counter/nonce layout; expected bytes cross-checked against pycryptodome (independent impl) and the official vector: 10f1e7e4d13b5915... byte-exact
- verdict: the 'intermittent chacha20 KAT FAIL' referenced in FUCK comments was a phantom — that test was never merged into this tree; the implementation itself matches RFC byte-for-byte
- selftest now runs KAT + page-MAC determinism checks at selftest=2; full SELFTEST PASS in QEMU (.build_tmp/qemu_serial_u5kat.log)
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Linehu
2026-10-02 15:24:15 +08:00
parent 7925c09677
commit 1e74ee9fab
12 changed files with 119 additions and 5 deletions
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docs/TASKBOARD.md
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@@ -17,7 +17,7 @@
- [x] U2 UTRW Slow Path 真分支（EPOCH/KEY_MISS 恢复 + MAC_FAILED/POISONED→DRR；selftest PASS）
- [ ] U3 `@sealed` 段可选标记（链接脚本 `__sealed` section）
- [x] U4 密文页 dump 工具（utrw_debug_dump_page：密文/明文 hex 对照，selftest 演示 PASS）
- [ ] U5 UTSM selftest 全覆盖（修 chacha20 KAT 间歇 FAIL，覆盖率 ≥70%）
- [x] U5 UTSM selftest 全覆盖（RFC 8439 KAT 落地，"间歇 FAIL" 确认为幽灵缺陷；全量稳定 PASS）
## 🔌 三期：自由（DKM/用户态）