chore(task): archive 06-27-mlkem-top-tb
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.trellis/tasks/archive/2026-06/06-27-mlkem-top-tb/prd.md
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# mlkem_top KAT Testbench
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## Goal
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编写 `mlkem_top` 的 KAT (Known Answer Test) testbench,使用 FIPS 203 标准测试向量验证 KeyGen/Encaps/Decaps 正确性。
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## Data Source
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`/home/fallensigh/Dev/ml-kem-r/test_data/kat_MLKEM_512.rsp`
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- 100 个测试向量 (count 0-99)
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- 每个向量包含:d, z, msg, pk, sk, ct, ss
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- NIST FIPS 203 标准格式
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## Requirements
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1. Python `gen_vectors.py` 解析 KAT 文件,生成 `mlkem_top_input.hex` 和 `mlkem_top_expected.hex`
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2. Verilog `tb_mlkem_top_xsim.v`:
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- 读取输入向量 (d, z, msg)
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- 驱动 KeyGen → 验证 pk, sk
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- 驱动 Encaps → 验证 ct, ss
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- 驱动 Decaps → 验证 ss
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- 超时看门狗
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- pass/fail 统计
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## Decisions
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* 先用 ML-KEM-512 (k=2),后续扩展 768/1024
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* 文件向量模式,遵循现有 TB 风格
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* 自检模式:与 KAT 期望值逐个字节比较
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## Test Flow (per vector)
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1. 复位
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2. KeyGen: d → verify pk, sk
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3. Encaps: msg → verify ct, ss
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4. Decaps: ct → verify ss (output matches ss from encaps)
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## Acceptance Criteria
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* [ ] 至少 count=0 的 KeyGen 通过
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* [ ] 至少 count=0 的 Encaps 通过
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* [ ] at least basic Decaps consistency
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* [ ] xvlog 编译通过
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* [ ] xsim 仿真通过
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## Out of Scope
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* 全部 100 个向量(先做前 5 个)
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* ct_n 无效密文测试
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* ML-KEM-768/1024
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