From 0a8b3dae69e29b7d39e6197a945f21453b53466b Mon Sep 17 00:00:00 2001
From: FallenSigh <fallensigh@gmail.com>
Date: Mon, 29 Jun 2026 01:00:47 +0800
Subject: [PATCH] feat(enc): Encaps E0 - op_i/msg_i/ek-load scaffold +
 H(ek)+G(m||H(ek))

Extend mlkem_top with a runtime op_i select (0=KeyGen, 1=Encaps) and the
first Encaps stages, reusing the shared keccak_core and the ST_H multi-block
SHA3-256 machinery:
  ST_ENC_H: H(ek) over preloaded ek_bram (same FSM as KeyGen ST_H)
  ST_ENC_G: (K,r) = G(m||H(ek)) via new 64-byte single-block SHA3-512

- sha3_top_shared: add mode=2'b11 = SHA3-512 over a full 512-bit message
  (g512_pad). Standalone tb_sha3_g512 confirms it byte-exact.
- mlkem_top: new ports op_i, msg_i, ek_in_{we,addr,byte} (ek preload), ss_o,
  dbg_ct_*, dbg_r_o/dbg_hek_o. st widened 4->5 bits; ST_ENC_* states added.
  Renamed message port to msg_i to avoid collision with ST_M counter m_i.
- TB tb_mlkem_enc_katK + gen_encaps_vectors.py (per-byte ek/m/ct/ss vectors).

Verified ss==KAT.ss for K=2/3/4, cases 0-2 (all PASS). KeyGen unaffected
(K=2 c0 still ek==pk, dk==sk byte-exact).
---
 .claude/plans/encaps_plan.md             |   90 ++
 sync_rtl/sha3/TB/tb_sha3_g512.v          |   50 +
 sync_rtl/sha3/sha3_top_shared.v          |    6 +-
 sync_rtl/top/TB/gen_encaps_vectors.py    |   76 ++
 sync_rtl/top/TB/tb_mlkem_enc_katK_xsim.v |   97 ++
 sync_rtl/top/TB/tb_mlkem_kg_katK_xsim.v  |    8 +-
 sync_rtl/top/TB/vectors/enc_k2_c0_ct.hex |  768 +++++++++++
 sync_rtl/top/TB/vectors/enc_k2_c0_ek.hex |  800 +++++++++++
 sync_rtl/top/TB/vectors/enc_k2_c0_m.hex  |   32 +
 sync_rtl/top/TB/vectors/enc_k2_c0_ss.hex |   32 +
 sync_rtl/top/TB/vectors/enc_k2_c1_ct.hex |  768 +++++++++++
 sync_rtl/top/TB/vectors/enc_k2_c1_ek.hex |  800 +++++++++++
 sync_rtl/top/TB/vectors/enc_k2_c1_m.hex  |   32 +
 sync_rtl/top/TB/vectors/enc_k2_c1_ss.hex |   32 +
 sync_rtl/top/TB/vectors/enc_k2_c2_ct.hex |  768 +++++++++++
 sync_rtl/top/TB/vectors/enc_k2_c2_ek.hex |  800 +++++++++++
 sync_rtl/top/TB/vectors/enc_k2_c2_m.hex  |   32 +
 sync_rtl/top/TB/vectors/enc_k2_c2_ss.hex |   32 +
 sync_rtl/top/TB/vectors/enc_k3_c0_ct.hex | 1088 +++++++++++++++
 sync_rtl/top/TB/vectors/enc_k3_c0_ek.hex | 1184 ++++++++++++++++
 sync_rtl/top/TB/vectors/enc_k3_c0_m.hex  |   32 +
 sync_rtl/top/TB/vectors/enc_k3_c0_ss.hex |   32 +
 sync_rtl/top/TB/vectors/enc_k3_c1_ct.hex | 1088 +++++++++++++++
 sync_rtl/top/TB/vectors/enc_k3_c1_ek.hex | 1184 ++++++++++++++++
 sync_rtl/top/TB/vectors/enc_k3_c1_m.hex  |   32 +
 sync_rtl/top/TB/vectors/enc_k3_c1_ss.hex |   32 +
 sync_rtl/top/TB/vectors/enc_k3_c2_ct.hex | 1088 +++++++++++++++
 sync_rtl/top/TB/vectors/enc_k3_c2_ek.hex | 1184 ++++++++++++++++
 sync_rtl/top/TB/vectors/enc_k3_c2_m.hex  |   32 +
 sync_rtl/top/TB/vectors/enc_k3_c2_ss.hex |   32 +
 sync_rtl/top/TB/vectors/enc_k4_c0_ct.hex | 1568 ++++++++++++++++++++++
 sync_rtl/top/TB/vectors/enc_k4_c0_ek.hex | 1568 ++++++++++++++++++++++
 sync_rtl/top/TB/vectors/enc_k4_c0_m.hex  |   32 +
 sync_rtl/top/TB/vectors/enc_k4_c0_ss.hex |   32 +
 sync_rtl/top/TB/vectors/enc_k4_c1_ct.hex | 1568 ++++++++++++++++++++++
 sync_rtl/top/TB/vectors/enc_k4_c1_ek.hex | 1568 ++++++++++++++++++++++
 sync_rtl/top/TB/vectors/enc_k4_c1_m.hex  |   32 +
 sync_rtl/top/TB/vectors/enc_k4_c1_ss.hex |   32 +
 sync_rtl/top/TB/vectors/enc_k4_c2_ct.hex | 1568 ++++++++++++++++++++++
 sync_rtl/top/TB/vectors/enc_k4_c2_ek.hex | 1568 ++++++++++++++++++++++
 sync_rtl/top/TB/vectors/enc_k4_c2_m.hex  |   32 +
 sync_rtl/top/TB/vectors/enc_k4_c2_ss.hex |   32 +
 sync_rtl/top/mlkem_top.v                 |  155 ++-
 43 files changed, 21956 insertions(+), 30 deletions(-)
 create mode 100644 .claude/plans/encaps_plan.md
 create mode 100644 sync_rtl/sha3/TB/tb_sha3_g512.v
 create mode 100644 sync_rtl/top/TB/gen_encaps_vectors.py
 create mode 100644 sync_rtl/top/TB/tb_mlkem_enc_katK_xsim.v
 create mode 100644 sync_rtl/top/TB/vectors/enc_k2_c0_ct.hex
 create mode 100644 sync_rtl/top/TB/vectors/enc_k2_c0_ek.hex
 create mode 100644 sync_rtl/top/TB/vectors/enc_k2_c0_m.hex
 create mode 100644 sync_rtl/top/TB/vectors/enc_k2_c0_ss.hex
 create mode 100644 sync_rtl/top/TB/vectors/enc_k2_c1_ct.hex
 create mode 100644 sync_rtl/top/TB/vectors/enc_k2_c1_ek.hex
 create mode 100644 sync_rtl/top/TB/vectors/enc_k2_c1_m.hex
 create mode 100644 sync_rtl/top/TB/vectors/enc_k2_c1_ss.hex
 create mode 100644 sync_rtl/top/TB/vectors/enc_k2_c2_ct.hex
 create mode 100644 sync_rtl/top/TB/vectors/enc_k2_c2_ek.hex
 create mode 100644 sync_rtl/top/TB/vectors/enc_k2_c2_m.hex
 create mode 100644 sync_rtl/top/TB/vectors/enc_k2_c2_ss.hex
 create mode 100644 sync_rtl/top/TB/vectors/enc_k3_c0_ct.hex
 create mode 100644 sync_rtl/top/TB/vectors/enc_k3_c0_ek.hex
 create mode 100644 sync_rtl/top/TB/vectors/enc_k3_c0_m.hex
 create mode 100644 sync_rtl/top/TB/vectors/enc_k3_c0_ss.hex
 create mode 100644 sync_rtl/top/TB/vectors/enc_k3_c1_ct.hex
 create mode 100644 sync_rtl/top/TB/vectors/enc_k3_c1_ek.hex
 create mode 100644 sync_rtl/top/TB/vectors/enc_k3_c1_m.hex
 create mode 100644 sync_rtl/top/TB/vectors/enc_k3_c1_ss.hex
 create mode 100644 sync_rtl/top/TB/vectors/enc_k3_c2_ct.hex
 create mode 100644 sync_rtl/top/TB/vectors/enc_k3_c2_ek.hex
 create mode 100644 sync_rtl/top/TB/vectors/enc_k3_c2_m.hex
 create mode 100644 sync_rtl/top/TB/vectors/enc_k3_c2_ss.hex
 create mode 100644 sync_rtl/top/TB/vectors/enc_k4_c0_ct.hex
 create mode 100644 sync_rtl/top/TB/vectors/enc_k4_c0_ek.hex
 create mode 100644 sync_rtl/top/TB/vectors/enc_k4_c0_m.hex
 create mode 100644 sync_rtl/top/TB/vectors/enc_k4_c0_ss.hex
 create mode 100644 sync_rtl/top/TB/vectors/enc_k4_c1_ct.hex
 create mode 100644 sync_rtl/top/TB/vectors/enc_k4_c1_ek.hex
 create mode 100644 sync_rtl/top/TB/vectors/enc_k4_c1_m.hex
 create mode 100644 sync_rtl/top/TB/vectors/enc_k4_c1_ss.hex
 create mode 100644 sync_rtl/top/TB/vectors/enc_k4_c2_ct.hex
 create mode 100644 sync_rtl/top/TB/vectors/enc_k4_c2_ek.hex
 create mode 100644 sync_rtl/top/TB/vectors/enc_k4_c2_m.hex
 create mode 100644 sync_rtl/top/TB/vectors/enc_k4_c2_ss.hex

diff --git a/.claude/plans/encaps_plan.md b/.claude/plans/encaps_plan.md
new file mode 100644
index 0000000..eaab2e3
--- /dev/null
+++ b/.claude/plans/encaps_plan.md
@@ -0,0 +1,90 @@
+# ML-KEM Encaps 顶层集成 — 实现计划
+
+> 在现有 `mlkem_top`(KeyGen 已 KAT 通过)基础上扩展 Encaps(FIPS 203 Alg 17 + K-PKE.Encrypt Alg 14)。
+> 决策(已与用户确认):**(1) 统一进 mlkem_top(加 op_i 选择 + ST_ENC_* 状态,复用同一套叶子 + BRAM 银行);(2) 一上来就做全 K(2/3/4);(3) golden 只做端到端 KAT(ct==KAT.ct, ss==KAT.ss),逐级用 dbg tap 在 bring-up 时对拍。**
+
+## 算法(Encaps,全 K)
+输入:ek(=KAT.pk,384K+32 B)、m(=KAT.msg,32 B)。输出:K=ss(32 B)、c=ct(32·(du·K+dv) B)。
+1. `h = H(ek)` = SHA3-256(ek)，多块。
+2. `(K_ss, r) = G(m ‖ h)` = SHA3-512(64 B,单块)。`K_ss = hash[255:0]`，`r = hash[511:256]`。**ss 即 K_ss,无 KDF/J。**
+3. `t̂[i] = byteDecode₁₂(ek[i·384 .. (i+1)·384])`，i∈0..K-1；`rho = ek[384K .. 384K+32]`。
+4. `Â[i][j] = SampleNTT(rho‖j‖i)` —— 与 KeyGen ST_A 完全相同。
+5. `y[i]  = CBD_η1(PRF(r, i))`，i=0..K-1(nonce 0..K-1)。
+6. `e1[i] = CBD_η2(PRF(r, K+i))`，i=0..K-1(nonce K..2K-1)。**η2 恒=2。**
+7. `e2    = CBD_η2(PRF(r, 2K))`(nonce 2K)。
+8. `ŷ[i] = NTT(y[i])`(mode=0)。
+9. `u[i] = INTT(Σⱼ Â[j][i]∘ŷ[j]) + e1[i]`，i=0..K-1。**注意转置:用 Â[j][i](slot=j·K+i),不是 KeyGen 的 Â[i][j]。** INTT = ntt_core mode=1(内置 ×3303 缩放)。
+10. `mu[c] = Decompress₁(byteDecode₁(m)[c])` = m 第 c bit ? 1665 : 0(无需存储,m 寄存器逐 bit 算)。
+11. `v = INTT(Σⱼ t̂[j]∘ŷ[j]) + e2 + mu`。
+12. `c1 = byteEncode_du(Compress_du(u[i]))` 拼 K 个；`c2 = byteEncode_dv(Compress_dv(v))`；`ct = c1 ‖ c2`。
+13. du/dv:K=2/3 → (10,4);K=4 → (11,5)。ct 长度:K=2→768,K=3→1088,K=4→1568。
+
+## 复用与新增
+
+### 直接复用(零改动或仅加 phase mux)
+- `u_sha3`(sha3_top_shared):H(ek) 多块 + G 单块 —— 与 KeyGen ST_H/ST_G 同。
+- 共享 `u_keccak`:扩 sel_* 4-way mux,加 Encaps phase 选择。
+- `u_snt`(sample_ntt):A 再生 —— 与 ST_A 同。
+- `u_cbd`(sample_cbd):y/e1/e2 —— **新增 η2=2 驱动**(eta_i 现仅接 eta1_rt;Encaps 的 e1/e2 phase 驱动 2)。
+- `u_ntt`(ntt_core):ŷ 用 mode=0;u/v 的 INTT 用 **mode=1**(缩放已内置)。
+- `u_pmul`(poly_mul):点乘 Â[j][i]∘ŷ[j] 与 t̂[j]∘ŷ[j];累加在顶层逐系数 modQ(同 ST_M)。
+- 3 个系数银行 bank_a/bank_se/bank_t:**容量够,见存储编排**,只加 Encaps 的读写 phase mux。
+
+### 新增 RTL
+- `byteDecode₁₂`:ek 3 字节 → 2 系数。`c0=b0|((b1&0xF)<<8); c1=(b1>>4)|(b2<<4)`。组合逻辑,流式写 bank_t。
+- `Compress` 实例:实例化现有 `comp_decomp_sync`(mode=0,d=du/dv),top 当前未用。
+- `byteEncode_d` 通用位打包器(d∈{4,5,10,11}):把 d-bit 压缩值 LSB-first 流式打包成字节写 ct_bram。**新增**(现有 byteEncode12 是 2→3 硬编码,不通用)。
+- `mu` 流内生成:INTT v 输出时按 m 寄存器对应 bit 加 1665。
+- `ct_bram`(sd_bram W=8 D=2048 A=11):ct 字节缓冲(≤1568 B)。
+- ek 载入路径:`m_i[255:0]` 端口 + ek 流式载入接口(valid/ready 写入 ek_bram),Encaps 前预填。
+- 输出:`ss_o`(寄存器 + dbg tap);ct 经 dbg tap 读 ct_bram(对齐现有"无流式输出、靠 readback"的风格)。
+- `op_i`(KeyGen/Encaps 选择) + 新 FSM 状态。
+
+## 存储编排(关键 — 全 K 用现有 28 slot 银行不扩容)
+- bank_a (D=4096, 16 slot):Â[i][j],K=4 用满 16。
+- bank_se (D=2048, 8 slot):y_hat[0..K-1] + e1[0..K-1] = 2K slot(K=4→8,刚好用满)。
+- bank_t (D=1024, 4 slot):**E0 先放 t̂[0..K-1](从 ek 解码),也用作 e2 的临时家**。
+- **e2 落点**:e2 只在算 v 时需要,算 u 时 bank_t 空闲 → e2 暂存 bank_t[K..](K=2/3 有空 slot)。K=4 时 bank_t 4 slot 被 t̂ 占满 → e2 先存 bank_se 某 slot(算 u 阶段 e1 仍在用,故 e2 需独立 slot)。
+  - **解法(全 K 统一,避免分支)**:算 u 时 t̂ 尚未需要 → **先做 u(用 A+y_hat+e1),u 全部算完压缩进 ct 后,e1 已用完** → 复用 bank_se 的 e1 区放 e2,再从 ek 解码 t̂ 进 bank_t 算 v。峰值 slot = 16(A)+ 2K(se)+ 0(t 尚未填)= K=4 时 24 ≤ 28。✅
+  - 时序:E_A(填 A)→ E_CBD(y/e1/e2... e2 先丢 bank_t[0])→ E_NTT(y→y_hat)→ E_U(算 u[i],压缩写 ct c1 区)→ E_V_PREP(t̂ 解码进 bank_t,e2 从 bank_t[0] 搬到 bank_se 空 slot 或就地)→ E_V(算 v,+e2+mu,压缩写 ct c2 区)。
+  - **简化**:e2 在 E_CBD 阶段先存 bank_se 的 e1 区**之后**的 slot 不够(K=4)。改为 e2 存 bank_t[0](此时 t̂ 未填),E_V_PREP 时 t̂ 从 ek 流式解码覆盖 bank_t,但 e2 要先读出暂存(单 poly 256×12b 可进一个小 reg 阵列,或搬到 bank_se 算完 u 后的空位)。bring-up 时定稿,以 dbg tap 验证。
+
+## 运行时参数(新增)
+```
+eta2_rt = 2'd2;                              // 恒定
+du_rt   = (k==4) ? 5'd11 : 5'd10;
+dv_rt   = (k==4) ? 5'd5  : 5'd4;
+c1_bytes_rt = 32*du_rt*k_r;                  // K2:640 K3:960 K4:1408
+c2_bytes_rt = 32*dv_rt;                      // K2:128 K3:128 K4:160
+ct_bytes_rt = c1_bytes_rt + c2_bytes_rt;     // 768 / 1088 / 1568
+```
+
+## 顶层接口新增
+- `op_i` (1b):0=KeyGen(现有),1=Encaps。在 start_i 锁存为 op_r。
+- `m_i [255:0]`:Encaps 消息(byte0 在低)。
+- ek 载入:`ek_in_valid_i/ek_in_byte_i[7:0]/ek_in_ready_o`(或复用 dbg 写口),Encaps 前把 ek 流进 ek_bram。
+- `ss_o [255:0]` + `done_o`(复用);ct 经 `dbg_ct_idx_i[10:0] → dbg_ct_o[7:0]` readback。
+
+## 实现阶段(逐阶段 KAT/dbg 对拍)
+- **E0 — 脚手架 + ek 载入 + H/G**:加 op_i/m_i/ek 载入,ST_ENC_LOAD→ST_ENC_H(H(ek))→ST_ENC_G(G(m‖h))。dbg 验证 ss=K_ss、r(对 ml-kem-r logging::Encaps 的 K/r/H(ek))。
+- **E1 — A 再生 + t̂ 解码**:ST_ENC_A 复用 snt 写 bank_a;byteDecode12 把 ek 解码进 bank_t。dbg 读系数对 KeyGen golden 的 Ahat / 对 KAT pk 解码的 t̂。
+- **E2 — y/e1/e2 采样 (η1/η2)**:ST_ENC_C,nonce 0..2K,eta 在 e1/e2 切 2。dbg 验证 y/e1/e2(对 ml-kem-r)。
+- **E3 — ŷ = NTT(y)**:ST_ENC_N,mode=0,就地。dbg 对 y_hat。
+- **E4 — u = INTT(Σ Â[j][i]∘ŷ[j]) + e1**:ST_ENC_U,poly_mul + 累加 + INTT(mode=1) + 加 e1。**转置寻址 slot=j·K+i**。dbg 对 u。
+- **E5 — Compress_du + byteEncode_du → c1**:comp_decomp + 通用打包器写 ct_bram c1 区。dbg 对 ct[0..c1_bytes]==KAT.ct 前缀。
+- **E6 — v = INTT(Σ t̂[j]∘ŷ[j]) + e2 + mu**:ST_ENC_V,mu 流内由 m bit 生成。dbg 对 v。
+- **E7 — Compress_dv + byteEncode_dv → c2 + 端到端 KAT**:写 ct c2 区。干净 TB 喂 ek/m,比 ct(全长)==KAT.ct 且 ss==KAT.ss,K=2/3/4 各 count=0..N。
+
+## 验证
+- TB `tb_mlkem_enc_katK_xsim.v`:从 `~/Dev/ml-kem-r/test_data/kat_MLKEM_{512,768,1024}.rsp` 取 pk(→ek)、msg(→m)、ct、ss,逐字节比 ct + 比 ss。
+- bring-up 中间对拍:`cargo run --example logging`(已有 Encaps log::debug,输出 K/r/H(ek)/|c|),或临时加 dump_encaps.rs 出 256-coeff 中间量(仅工作树,不提交 ml-kem-r)。
+- XSIM 环境同 KeyGen:`source settings64.sh; export LD_PRELOAD=libtinfo.so.5; rm -rf xsim.dir .Xil`。
+
+## 风险 / 注意
+- **转置**:Encrypt 用 Â[j][i],KeyGen 用 Â[i][j]。slot = j*K+i(列优先)。最易错,E4 单列 dbg 对拍。
+- **G 字节序**:KeyGen G 输入 d 原序无翻转(keygen_plan 已确认);但 xcheck 发现 KAT 文件 d/z 存的是翻转序。**m 喂入字节序需 E0 用 KAT.msg 实测确认**(很可能与 d 同约定)。
+- **INTT 缩放**:ntt_core mode=1 已内置 ×3303,不要再缩放。
+- **e2 落点(K=4)**:见存储编排,bring-up 定稿,dbg 验证不踩 t̂/e1。
+- **byteEncode_d 通用打包**:d=10/11 跨字节,位序 LSB-first(同 byte_encode)。新写、单独 TB 或 E5 dbg 即验。
+- **共享 keccak 4-way mux**:加 Encaps phase 的 sel_ + kc_valid_o 门控,勿与 KeyGen phase 冲突(op_r 已区分)。
+
diff --git a/sync_rtl/sha3/TB/tb_sha3_g512.v b/sync_rtl/sha3/TB/tb_sha3_g512.v
new file mode 100644
index 0000000..2df5d09
--- /dev/null
+++ b/sync_rtl/sha3/TB/tb_sha3_g512.v
@@ -0,0 +1,50 @@
+// tb_sha3_g512.v - isolate sha3_top_shared mode=11 (64-byte SHA3-512).
+`timescale 1ns/1ps
+module tb_sha3_g512;
+    reg clk=0, rst_n=0;
+    reg [1:0] mode;
+    reg [511:0] data_i;
+    reg valid_i, ready_i;
+    wire ready_o, valid_o;
+    wire [511:0] hash_o;
+    // shared keccak
+    wire [1599:0] kc_state_i, kc_state_o;
+    wire kc_valid_i, kc_valid_o, kc_ready_o, kc_ready_i;
+
+    sha3_top_shared u_sha3 (
+        .clk(clk), .rst_n(rst_n), .mode(mode), .data_i(data_i),
+        .valid_i(valid_i), .ready_o(ready_o), .hash_o(hash_o), .valid_o(valid_o),
+        .ready_i(ready_i),
+        .mb_en(1'b0), .mb_block_i(1088'd0), .mb_valid_i(1'b0), .mb_last_i(1'b0), .mb_ready_o(),
+        .kc_state_o(kc_state_o), .kc_valid_o(kc_valid_o), .kc_ready_o(kc_ready_o),
+        .kc_state_i(kc_state_i), .kc_valid_i(kc_valid_i), .kc_ready_i(kc_ready_i)
+    );
+    keccak_core #(.ROUNDS(24)) u_kc (
+        .clk(clk), .rst_n(rst_n), .state_i(kc_state_i), .valid_i(kc_valid_i),
+        .ready_o(kc_ready_o), .state_o(kc_state_o), .valid_o(kc_valid_o), .ready_i(1'b1)
+    );
+    always #5 clk=~clk;
+
+    integer j;
+    initial begin
+        // m || hek (byte0 in [7:0]); m=20a7..ffff, hek=ca87..aac6
+        // build little-endian-in-register: byte0 at [7:0]
+        data_i = 512'd0;
+        // m bytes 0..31
+        data_i[  0 +: 256] = 256'hffff80fc331b2ca1904ccf554ed114bf99f6de44b92082c36c49700fe1b7a720;
+        // hek bytes 32..63
+        data_i[256 +: 256] = 256'hc6aa5100ed06d0c2db8cc3d1a36a62055b182f8d51ea71602501857e7c5d87ca;
+        mode=2'b11; valid_i=0; ready_i=1;
+        rst_n=0; repeat(4) @(posedge clk); rst_n=1; @(posedge clk);
+        valid_i=1; @(posedge clk);
+        while(!(valid_i && ready_o)) @(posedge clk);
+        valid_i=0;
+        while(!valid_o) @(posedge clk);
+        $write("K_ss = "); for(j=0;j<32;j=j+1) $write("%02x", hash_o[8*j +: 8]); $write("\n");
+        $write("r    = "); for(j=0;j<32;j=j+1) $write("%02x", hash_o[256+8*j +: 8]); $write("\n");
+        $display("want K_ss = 2b5c52ee72946331983ba050be0f435055c0547901e03559b356517889ea27c5");
+        $display("want r    = 08cd245f59e6cb6e3687c6632749b6c0737d183701f0b0492b843358893c6a24");
+        $finish;
+    end
+    initial begin #100000; $display("timeout"); $finish; end
+endmodule
diff --git a/sync_rtl/sha3/sha3_top_shared.v b/sync_rtl/sha3/sha3_top_shared.v
index b62ce97..101aff2 100644
--- a/sync_rtl/sha3/sha3_top_shared.v
+++ b/sync_rtl/sha3/sha3_top_shared.v
@@ -63,6 +63,7 @@ module sha3_top_shared (
     // Absorb state: message || suffix || pad10*1 into rate bits
     // ================================================================
     wire [575:0]  g_pad;
+    wire [575:0]  g512_pad;
     wire [1087:0] h_pad;
     wire [1087:0] j_pad;
 
@@ -70,12 +71,15 @@ module sha3_top_shared (
     assign h_pad = {1'b1, {828{1'b0}}, 1'b1, 2'b10, data_i[255:0]};
     // J: SHAKE suffix is "1111" — all ones, order irrelevant
     assign j_pad = {1'b1, {570{1'b0}}, 1'b1, 4'b1111, data_i[511:0]};
+    // mode 11 = G over a full 64-byte (512-bit) message (Encaps: G(m||H(ek))).
+    // SHA3-512 rate=576; suffix 01 + pad10*1: 1 + 60 zeros + 1 + 2'b10 + 512 = 576.
+    assign g512_pad = {1'b1, {60{1'b0}}, 1'b1, 2'b10, data_i[511:0]};
 
     wire [1599:0] absorb_state;
     assign absorb_state = (mode == 2'b00) ? {{(1600-576){1'b0}}, g_pad} :
                           (mode == 2'b01) ? {{(1600-1088){1'b0}}, h_pad} :
                           (mode == 2'b10) ? {{(1600-1088){1'b0}}, j_pad} :
-                          1600'd0;
+                                            {{(1600-576){1'b0}}, g512_pad};
 
     // ================================================================
     // Multi-block SHA3-256 absorb FSM (active only when mb_en=1)
diff --git a/sync_rtl/top/TB/gen_encaps_vectors.py b/sync_rtl/top/TB/gen_encaps_vectors.py
new file mode 100644
index 0000000..f596084
--- /dev/null
+++ b/sync_rtl/top/TB/gen_encaps_vectors.py
@@ -0,0 +1,76 @@
+#!/usr/bin/env python3
+"""gen_encaps_vectors.py - Emit per-byte Encaps KAT vectors for the XSIM TB.
+
+For ML-KEM-512/768/1024, parse the NIST .rsp and write, per case:
+  enc_k{K}_c{N}_ek.hex  : ek (=pk) bytes, one hex byte per line, byte 0 first
+  enc_k{K}_c{N}_m.hex   : msg bytes, one per line, byte 0 first
+  enc_k{K}_c{N}_ct.hex  : ct bytes, one per line, byte 0 first (golden)
+  enc_k{K}_c{N}_ss.hex  : ss bytes, one per line, byte 0 first (golden)
+
+Per-byte layout removes all endianness ambiguity: the TB preloads ek_bram with
+addr i = line i, builds m_i[8*i +: 8] = m byte i, and compares ct/ss byte-wise.
+
+Run: python3 gen_encaps_vectors.py [num_cases]
+"""
+
+import os
+import re
+import sys
+
+ML_KEM_R = os.environ.get("ML_KEM_R", os.path.expanduser("~/Dev/ml-kem-r"))
+OUT_DIR = os.path.join(os.path.dirname(__file__), "vectors")
+KATS = {2: "kat_MLKEM_512.rsp", 3: "kat_MLKEM_768.rsp", 4: "kat_MLKEM_1024.rsp"}
+
+
+def parse_kat(path, n):
+    """Return list of dicts {count, msg, pk, ct, ss} (hex strings) for first n."""
+    vecs, cur = [], {}
+    with open(path) as f:
+        for line in f:
+            line = line.strip()
+            m = re.match(r"^count\s*=\s*(\d+)$", line)
+            if m:
+                if cur:
+                    vecs.append(cur)
+                if len(vecs) >= n:
+                    break
+                cur = {"count": int(m.group(1))}
+                continue
+            # exact-key match so "ct =" doesn't catch "ct_n ="
+            m = re.match(r"^(msg|pk|ct|ss)\s*=\s*([0-9a-fA-F]+)$", line)
+            if m and cur:
+                cur[m.group(1)] = m.group(2).lower()
+    if cur and len(vecs) < n:
+        vecs.append(cur)
+    return vecs
+
+
+def write_bytes(path, hexstr):
+    """Write hex string as one byte per line (byte 0 = first 2 hex chars)."""
+    with open(path, "w") as f:
+        for i in range(0, len(hexstr), 2):
+            f.write(hexstr[i:i + 2] + "\n")
+
+
+def main():
+    ncases = int(sys.argv[1]) if len(sys.argv) > 1 else 3
+    os.makedirs(OUT_DIR, exist_ok=True)
+    for k, fname in KATS.items():
+        path = os.path.join(ML_KEM_R, "test_data", fname)
+        if not os.path.exists(path):
+            print(f"skip K={k}: {path} not found", file=sys.stderr)
+            continue
+        vecs = parse_kat(path, ncases)
+        for v in vecs:
+            n = v["count"]
+            base = os.path.join(OUT_DIR, f"enc_k{k}_c{n}")
+            write_bytes(f"{base}_ek.hex", v["pk"])
+            write_bytes(f"{base}_m.hex", v["msg"])
+            write_bytes(f"{base}_ct.hex", v["ct"])
+            write_bytes(f"{base}_ss.hex", v["ss"])
+        print(f"K={k}: wrote {len(vecs)} cases "
+              f"(ek={len(vecs[0]['pk'])//2}B ct={len(vecs[0]['ct'])//2}B)")
+
+
+if __name__ == "__main__":
+    main()
diff --git a/sync_rtl/top/TB/tb_mlkem_enc_katK_xsim.v b/sync_rtl/top/TB/tb_mlkem_enc_katK_xsim.v
new file mode 100644
index 0000000..11f8c49
--- /dev/null
+++ b/sync_rtl/top/TB/tb_mlkem_enc_katK_xsim.v
@@ -0,0 +1,97 @@
+// tb_mlkem_enc_katK_xsim.v - ML-KEM Encaps vs NIST KAT, parametric K (KP) + CASE.
+// E0 stage: verify H(ek), G(m||H(ek)) -> (ss=K, r). Preloads ek into ek_bram,
+// pulses start with op=1, waits for done, checks ss == KAT.ss and dumps H(ek)/r.
+//
+// xelab -generic_top KP=2|3|4 ; xsim -testplusarg CASE=n
+//   ek/m/ct/ss vectors: sync_rtl/top/TB/vectors/enc_k{K}_c{N}_{ek,m,ct,ss}.hex
+//   (per-byte hex, byte 0 first).
+`timescale 1ns/1ps
+module tb_mlkem_enc_katK_xsim;
+    parameter KP = 2;
+    localparam EKB = 384*KP + 32;                  // ek (=pk) bytes
+    localparam CTB = (KP==4) ? 1568 : (32*(10*KP+4)); // ct bytes: K2 768,K3 1088,K4 1568
+
+    reg clk=0, rst_n=0, start_i=0;
+    reg [2:0]   k_i;
+    reg [255:0] d_i, z_i, m_i;
+    wire busy_o, done_o;
+    // ek preload port
+    reg         ek_in_we=0; reg [10:0] ek_in_addr=0; reg [7:0] ek_in_byte=0;
+    wire [255:0] ss_o;
+    reg  [10:0] dbg_ct_idx_i=0; wire [7:0] dbg_ct_o;
+    reg [3:0] dbg_slot_i=0; reg [7:0] dbg_idx_i=0; wire [11:0] dbg_coeff_o;
+    reg dbg_byte_sel_i=0; reg [10:0] dbg_byte_idx_i=0; wire [7:0] dbg_byte_o;
+    reg [11:0] dbg_dk_idx_i=0; wire [7:0] dbg_dk_o;
+    wire [255:0] dbg_rho_o, dbg_sigma_o, dbg_r_o, dbg_hek_o;
+
+    mlkem_top dut (
+        .clk(clk), .rst_n(rst_n), .k_i(k_i), .op_i(1'b1),
+        .d_i(d_i), .z_i(z_i), .msg_i(m_i), .start_i(start_i),
+        .busy_o(busy_o), .done_o(done_o),
+        .ek_in_we(ek_in_we), .ek_in_addr(ek_in_addr), .ek_in_byte(ek_in_byte),
+        .ss_o(ss_o), .dbg_ct_idx_i(dbg_ct_idx_i), .dbg_ct_o(dbg_ct_o),
+        .dbg_slot_i(dbg_slot_i), .dbg_idx_i(dbg_idx_i), .dbg_coeff_o(dbg_coeff_o),
+        .dbg_byte_sel_i(dbg_byte_sel_i), .dbg_byte_idx_i(dbg_byte_idx_i), .dbg_byte_o(dbg_byte_o),
+        .dbg_dk_idx_i(dbg_dk_idx_i), .dbg_dk_o(dbg_dk_o),
+        .dbg_rho_o(dbg_rho_o), .dbg_sigma_o(dbg_sigma_o),
+        .dbg_r_o(dbg_r_o), .dbg_hek_o(dbg_hek_o)
+    );
+    always #5 clk = ~clk;
+
+    reg [7:0] ek_b  [0:EKB-1];
+    reg [7:0] m_b   [0:31];
+    reg [7:0] ss_b  [0:31];
+    integer c, i, errors, casenum, j;
+    reg [8*80-1:0] tag, ekfile, mfile, ssfile;
+
+    initial begin
+        if (!$value$plusargs("CASE=%d", casenum)) casenum = 0;
+        $sformat(tag, "k%0d", KP);
+        $sformat(ekfile, "sync_rtl/top/TB/vectors/enc_%0s_c%0d_ek.hex", tag, casenum);
+        $sformat(mfile,  "sync_rtl/top/TB/vectors/enc_%0s_c%0d_m.hex",  tag, casenum);
+        $sformat(ssfile, "sync_rtl/top/TB/vectors/enc_%0s_c%0d_ss.hex", tag, casenum);
+        $readmemh(ekfile, ek_b);
+        $readmemh(mfile,  m_b);
+        $readmemh(ssfile, ss_b);
+
+        // build m_i: byte i in m_i[8*i +: 8]
+        m_i = 256'd0;
+        for (j = 0; j < 32; j = j + 1) m_i[8*j +: 8] = m_b[j];
+        k_i = KP[2:0];
+
+        $display("=== ML-KEM K=%0d Encaps KAT case %0d (E0) ===", KP, casenum);
+        $write("  m  = "); for (j=0;j<32;j=j+1) $write("%02x", m_b[j]); $write("\n");
+
+        rst_n=0; repeat(4) @(posedge clk); rst_n=1; @(posedge clk);
+
+        // ---- preload ek into ek_bram (1 byte/cycle) ----
+        for (i = 0; i < EKB; i = i + 1) begin
+            ek_in_we = 1'b1; ek_in_addr = i[10:0]; ek_in_byte = ek_b[i];
+            @(posedge clk);
+        end
+        ek_in_we = 1'b0; @(posedge clk);
+
+        // ---- run Encaps ----
+        start_i=1; @(posedge clk); start_i=0;
+        c=0; while(!done_o && c<2000000) begin @(posedge clk); c=c+1; end
+        if(!done_o) begin $display("FAIL K=%0d case %0d: timeout", KP, casenum); $finish; end
+        $display("=== Encaps E0 done in %0d cyc ===", c);
+
+        $write("  H(ek) = "); for (j=0;j<32;j=j+1) $write("%02x", dbg_hek_o[8*j +: 8]); $write("\n");
+        $write("  r     = "); for (j=0;j<32;j=j+1) $write("%02x", dbg_r_o[8*j +: 8]); $write("\n");
+        $write("  ss    = "); for (j=0;j<32;j=j+1) $write("%02x", ss_o[8*j +: 8]); $write("\n");
+
+        // ---- check ss == KAT.ss ----
+        errors = 0;
+        for (j = 0; j < 32; j = j + 1)
+            if (ss_o[8*j +: 8] !== ss_b[j]) begin
+                if (errors < 8) $display("  SS[%0d] got=%02x exp=%02x", j, ss_o[8*j +: 8], ss_b[j]);
+                errors = errors + 1;
+            end
+
+        if (errors == 0) $display("K=%0d CASE %0d PASS (E0): ss == KAT.ss", KP, casenum);
+        else             $display("K=%0d CASE %0d FAIL (E0): %0d ss mismatches", KP, casenum, errors);
+        $finish;
+    end
+    initial begin #120000000; $display("FAIL: global timeout"); $finish; end
+endmodule
diff --git a/sync_rtl/top/TB/tb_mlkem_kg_katK_xsim.v b/sync_rtl/top/TB/tb_mlkem_kg_katK_xsim.v
index d9e5699..a0562ea 100644
--- a/sync_rtl/top/TB/tb_mlkem_kg_katK_xsim.v
+++ b/sync_rtl/top/TB/tb_mlkem_kg_katK_xsim.v
@@ -19,12 +19,16 @@ module tb_mlkem_kg_katK_xsim;
 
     // KMAX defaults to 4 (worst-case sizing); KP selects the runtime k value.
     mlkem_top dut (
-        .clk(clk), .rst_n(rst_n), .k_i(k_i), .d_i(d_i), .z_i(z_i), .start_i(start_i),
+        .clk(clk), .rst_n(rst_n), .k_i(k_i), .op_i(1'b0),
+        .d_i(d_i), .z_i(z_i), .msg_i(256'd0), .start_i(start_i),
         .busy_o(busy_o), .done_o(done_o),
+        .ek_in_we(1'b0), .ek_in_addr(11'd0), .ek_in_byte(8'd0),
+        .ss_o(), .dbg_ct_idx_i(11'd0), .dbg_ct_o(),
         .dbg_slot_i(dbg_slot_i), .dbg_idx_i(dbg_idx_i), .dbg_coeff_o(dbg_coeff_o),
         .dbg_byte_sel_i(dbg_byte_sel_i), .dbg_byte_idx_i(dbg_byte_idx_i), .dbg_byte_o(dbg_byte_o),
         .dbg_dk_idx_i(dbg_dk_idx_i), .dbg_dk_o(dbg_dk_o),
-        .dbg_rho_o(dbg_rho_o), .dbg_sigma_o(dbg_sigma_o)
+        .dbg_rho_o(dbg_rho_o), .dbg_sigma_o(dbg_sigma_o),
+        .dbg_r_o(), .dbg_hek_o()
     );
     always #5 clk = ~clk;
 
diff --git a/sync_rtl/top/TB/vectors/enc_k2_c0_ct.hex b/sync_rtl/top/TB/vectors/enc_k2_c0_ct.hex
new file mode 100644
index 0000000..0059d6c
--- /dev/null
+++ b/sync_rtl/top/TB/vectors/enc_k2_c0_ct.hex
@@ -0,0 +1,768 @@
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new file mode 100644
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--- /dev/null
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diff --git a/sync_rtl/top/TB/vectors/enc_k2_c2_ss.hex b/sync_rtl/top/TB/vectors/enc_k2_c2_ss.hex
new file mode 100644
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diff --git a/sync_rtl/top/TB/vectors/enc_k3_c0_ct.hex b/sync_rtl/top/TB/vectors/enc_k3_c0_ct.hex
new file mode 100644
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diff --git a/sync_rtl/top/TB/vectors/enc_k3_c1_ek.hex b/sync_rtl/top/TB/vectors/enc_k3_c1_ek.hex
new file mode 100644
index 0000000..920f646
--- /dev/null
+++ b/sync_rtl/top/TB/vectors/enc_k3_c1_ek.hex
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diff --git a/sync_rtl/top/TB/vectors/enc_k3_c2_ss.hex b/sync_rtl/top/TB/vectors/enc_k3_c2_ss.hex
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diff --git a/sync_rtl/top/TB/vectors/enc_k4_c0_ct.hex b/sync_rtl/top/TB/vectors/enc_k4_c0_ct.hex
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diff --git a/sync_rtl/top/TB/vectors/enc_k4_c0_ek.hex b/sync_rtl/top/TB/vectors/enc_k4_c0_ek.hex
new file mode 100644
index 0000000..e4a4a81
--- /dev/null
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diff --git a/sync_rtl/top/TB/vectors/enc_k4_c2_m.hex b/sync_rtl/top/TB/vectors/enc_k4_c2_m.hex
new file mode 100644
index 0000000..168e054
--- /dev/null
+++ b/sync_rtl/top/TB/vectors/enc_k4_c2_m.hex
@@ -0,0 +1,32 @@
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diff --git a/sync_rtl/top/TB/vectors/enc_k4_c2_ss.hex b/sync_rtl/top/TB/vectors/enc_k4_c2_ss.hex
new file mode 100644
index 0000000..5f0c4f8
--- /dev/null
+++ b/sync_rtl/top/TB/vectors/enc_k4_c2_ss.hex
@@ -0,0 +1,32 @@
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diff --git a/sync_rtl/top/mlkem_top.v b/sync_rtl/top/mlkem_top.v
index 9c07daf..27df6f9 100644
--- a/sync_rtl/top/mlkem_top.v
+++ b/sync_rtl/top/mlkem_top.v
@@ -28,12 +28,25 @@ module mlkem_top #(
     input              clk,
     input              rst_n,
     input  [2:0]       k_i,          // RUNTIME ML-KEM param: 2=512, 3=768, 4=1024
+    input              op_i,          // 0 = KeyGen, 1 = Encaps (captured at start_i)
     input  [255:0]     d_i,          // KeyGen seed d (byte 0 in d_i[7:0])
     input  [255:0]     z_i,          // implicit-rejection seed z
+    input  [255:0]     msg_i,        // Encaps message m (byte 0 in msg_i[7:0])
     input              start_i,      // pulse to begin KeyGen
     output             busy_o,       // high while running
     output             done_o,       // pulse when ek/dk ready
 
+    // Encaps ek input: stream ek bytes (=pk) into ek_bram before start_i with
+    // op_i=1. ek_in_we writes byte ek_in_byte at address ek_in_addr.
+    input              ek_in_we,     // write one ek byte (only honored in ST_IDLE for Encaps preload)
+    input  [10:0]      ek_in_addr,   // ek byte address 0..ek_bytes-1
+    input  [7:0]       ek_in_byte,   // ek byte value
+    // Encaps shared secret output (= K), valid at done_o
+    output [255:0]     ss_o,
+    // Encaps ciphertext readback tap: ct byte by index 0..ct_bytes-1
+    input  [10:0]      dbg_ct_idx_i,
+    output [7:0]       dbg_ct_o,
+
     // Debug readback tap: read one stored coefficient by (poly slot, index).
     // Lets stage TBs verify intermediates without wide buses.
     input  [3:0]       dbg_slot_i,   // poly slot (see localparams below)
@@ -49,7 +62,10 @@ module mlkem_top #(
     output [7:0]       dbg_dk_o,
     // Debug taps for hash outputs
     output [255:0]     dbg_rho_o,
-    output [255:0]     dbg_sigma_o
+    output [255:0]     dbg_sigma_o,
+    // Encaps debug taps: r (G high half) and H(ek)
+    output [255:0]     dbg_r_o,
+    output [255:0]     dbg_hek_o
 );
 
     localparam Q = `Q;   // 3329
@@ -70,6 +86,27 @@ module mlkem_top #(
     wire [3:0] h_nblk_rt = (k_r == 3'd2) ? 4'd6 : (k_r == 3'd3) ? 4'd9 : 4'd12;
     wire [11:0] h_last_rt = {6'b0, h_nblk_rt} * 12'd136 - 12'd1;  // final padded byte index
 
+    // ---- Encaps runtime params ----
+    reg          op_r;             // 0=KeyGen 1=Encaps (captured at start)
+    reg  [255:0] m_r;              // Encaps message m (captured at start)
+    reg  [255:0] ss_r;             // Encaps shared secret K (= G output low half)
+    reg  [255:0] r_r;              // Encaps PRF seed r (= G output high half)
+    // FIPS 203: eta2 = 2 for all parameter sets.
+    wire [1:0]  eta2_rt = 2'd2;
+    // Compression params: (du,dv) = (10,4) for k=2/3, (11,5) for k=4.
+    wire [4:0]  du_rt = (k_r == 3'd4) ? 5'd11 : 5'd10;
+    wire [4:0]  dv_rt = (k_r == 3'd4) ? 5'd5  : 5'd4;
+    // Ciphertext byte sizes: c1 = 32*du*k, c2 = 32*dv, ct = c1+c2.
+    wire [11:0] c1_bytes_rt = 12'd32 * {7'b0, du_rt} * {9'b0, k_r};  // 640/960/1408
+    wire [11:0] c2_bytes_rt = 12'd32 * {7'b0, dv_rt};                 // 128/128/160
+    wire [11:0] ct_bytes_rt = c1_bytes_rt + c2_bytes_rt;             // 768/1088/1568
+    assign ss_o = ss_r;
+    // ct readback tap (ct_bram added in E5/E7); tied off until then.
+    /* verilator lint_off UNUSEDSIGNAL */
+    wire [10:0] dbg_ct_idx_unused = dbg_ct_idx_i;
+    /* verilator lint_on UNUSEDSIGNAL */
+    assign dbg_ct_o = 8'd0;
+
     // ================================================================
     // Polynomial storage, sized for KMAX (worst case). Runtime k uses a
     // sub-range. Slot layout (each slot = 256 coeffs):
@@ -203,10 +240,17 @@ module mlkem_top #(
     reg  [10:0] ek_wa, dkp_wa;
     reg  [7:0]  ek_wd, dkp_wd;
 
+    // ek BRAM write port: KeyGen ST_E drives ek_we/ek_wa/ek_wd; Encaps preloads
+    // ek from the external ek_in_* port (TB streams ek=pk before start_i). The
+    // two never overlap (preload happens in ST_IDLE before an Encaps run).
+    wire        ek_we_mux = ek_in_we ? 1'b1       : ek_we;
+    wire [10:0] ek_wa_mux = ek_in_we ? ek_in_addr : ek_wa;
+    wire [7:0]  ek_wd_mux = ek_in_we ? ek_in_byte : ek_wd;
+
     sd_bram #(.W(8), .D(2048), .A(11)) u_ek_bram (
         .clk(clk),
         .rd_addr(ek_rd_addr), .rd_data(ek_rd_data),
-        .wr_en(ek_we), .wr_addr(ek_wa), .wr_data(ek_wd)
+        .wr_en(ek_we_mux), .wr_addr(ek_wa_mux), .wr_data(ek_wd_mux)
     );
     sd_bram #(.W(8), .D(2048), .A(11)) u_dkp_bram (
         .clk(clk),
@@ -236,17 +280,29 @@ module mlkem_top #(
     // ================================================================
     // Top-level FSM (built incrementally). Stage 2a: G only.
     // ================================================================
-    localparam ST_IDLE   = 4'd0;
-    localparam ST_G      = 4'd1;   // run G(d||K), capture rho/sigma
-    localparam ST_A      = 4'd2;   // generate A_hat[i][j] via SampleNTT
-    localparam ST_C      = 4'd3;   // generate s[i],e[i] via CBD
-    localparam ST_N      = 4'd4;   // forward NTT of s[i],e[i] in place
-    localparam ST_M      = 4'd5;   // matrix accumulate t_hat = e_hat + sum A o s_hat
-    localparam ST_E      = 4'd6;   // byteEncode12 -> ek/dk BRAM
-    localparam ST_H      = 4'd7;   // H(ek) via multi-block SHA3-256
-    localparam ST_DONE   = 4'd15;
+    localparam ST_IDLE   = 5'd0;
+    localparam ST_G      = 5'd1;   // run G(d||K), capture rho/sigma
+    localparam ST_A      = 5'd2;   // generate A_hat[i][j] via SampleNTT
+    localparam ST_C      = 5'd3;   // generate s[i],e[i] via CBD
+    localparam ST_N      = 5'd4;   // forward NTT of s[i],e[i] in place
+    localparam ST_M      = 5'd5;   // matrix accumulate t_hat = e_hat + sum A o s_hat
+    localparam ST_E      = 5'd6;   // byteEncode12 -> ek/dk BRAM
+    localparam ST_H      = 5'd7;   // H(ek) via multi-block SHA3-256
+    // ---- Encaps states ----
+    localparam ST_ENC_LOAD = 5'd8;  // ek already preloaded; placeholder/settle
+    localparam ST_ENC_H    = 5'd9;  // H(ek) via multi-block SHA3-256 (reuses ST_H logic)
+    localparam ST_ENC_G    = 5'd10; // (K,r) = G(m || H(ek)), 64-byte single block
+    localparam ST_ENC_A    = 5'd11; // regenerate A_hat (transpose used in U)
+    localparam ST_ENC_TDEC = 5'd12; // byteDecode12: ek -> t_hat (bank_t)
+    localparam ST_ENC_C    = 5'd13; // sample y,e1,e2 via CBD (eta1/eta2)
+    localparam ST_ENC_N    = 5'd14; // forward NTT of y in place
+    localparam ST_ENC_U    = 5'd15; // u = INTT(sum A^T o y_hat) + e1
+    localparam ST_ENC_C1   = 5'd16; // Compress_du + byteEncode_du -> ct c1
+    localparam ST_ENC_V    = 5'd17; // v = INTT(sum t_hat o y_hat) + e2 + mu
+    localparam ST_ENC_C2   = 5'd18; // Compress_dv + byteEncode_dv -> ct c2
+    localparam ST_DONE   = 5'd31;
 
-    reg [3:0]   st, st_next;
+    reg [4:0]   st, st_next;
     reg [255:0] rho_r, sigma_r;
 
     // A-generation bookkeeping: explicit i/j counters (avoid runtime divide)
@@ -270,6 +326,8 @@ module mlkem_top #(
     assign done_o = (st == ST_DONE);
     assign dbg_rho_o   = rho_r;
     assign dbg_sigma_o = sigma_r;
+    assign dbg_r_o     = r_r;
+    assign dbg_hek_o   = hek_r;
 
     // ---- sha3_top in G mode: data_i = {K_byte, d} (d byte0 in [7:0]) ----
     reg          sha3_valid;
@@ -277,7 +335,9 @@ module mlkem_top #(
     wire [511:0] sha3_hash;
     wire         sha3_vo;
     reg          sha3_ack;       // consumer ready for hash
-    wire [511:0] g_data = {248'b0, 5'b0, k_r, d_i};   // data_i[263:256]=k, [255:0]=d
+    wire [511:0] kg_g_data  = {248'b0, 5'b0, k_r, d_i};   // KeyGen G: [263:256]=k, [255:0]=d
+    wire [511:0] enc_g_data = {hek_r, m_r};               // Encaps G: m || H(ek), 64 bytes
+    wire [511:0] g_data = (st == ST_ENC_G) ? enc_g_data : kg_g_data;
 
     // ================================================================
     // Shared keccak_core + phase mux (3 consumers -> 1 core)
@@ -301,10 +361,12 @@ module mlkem_top #(
     wire          sha3_kc_ready_i, snt_kc_ready_i, cbd_kc_ready_i; // all 1'b1
     /* verilator lint_on UNUSEDSIGNAL */
 
-    // phase selects (mutually exclusive)
-    wire sel_sha3 = (st == ST_G) || (st == ST_H);
-    wire sel_snt  = (st == ST_A);
-    wire sel_cbd  = (st == ST_C);
+    // phase selects (mutually exclusive). Encaps adds ST_ENC_H/G (sha3),
+    // ST_ENC_A (snt), ST_ENC_C (cbd).
+    wire sel_sha3 = (st == ST_G) || (st == ST_H) ||
+                    (st == ST_ENC_H) || (st == ST_ENC_G);
+    wire sel_snt  = (st == ST_A) || (st == ST_ENC_A);
+    wire sel_cbd  = (st == ST_C) || (st == ST_ENC_C);
 
     // gated output-valid: only the active consumer sees kc_valid_o
     wire kc_valid_o_sha3 = kc_valid_o & sel_sha3;
@@ -334,10 +396,13 @@ module mlkem_top #(
     // multi-block absorb path (mb_en=1). These phases are disjoint in the
     // top FSM, so one sha3_top (one keccak_core) is sufficient. mb_en and
     // ready_i are muxed by phase; data_i/mode only matter while mb_en=0.
-    wire sha3_mb_en = (st == ST_H);
+    wire sha3_mb_en = (st == ST_H) || (st == ST_ENC_H);
+    // sha3 single-block mode: 2'b00 = G(33B) for KeyGen, 2'b11 = G(64B) for
+    // Encaps (m||H(ek)). mode only matters when mb_en=0.
+    wire [1:0] sha3_mode = (st == ST_ENC_G) ? 2'b11 : 2'b00;
     sha3_top_shared u_sha3 (
         .clk(clk), .rst_n(rst_n),
-        .mode(2'b00),                 // G = SHA3-512 (only used when mb_en=0)
+        .mode(sha3_mode),             // G = SHA3-512 (only used when mb_en=0)
         .data_i(g_data),
         .valid_i(sha3_valid),
         .ready_o(sha3_ready),
@@ -408,7 +473,7 @@ module mlkem_top #(
     // dbg_dk ek-region takes priority (its loop runs after the ek loop), so the
     // single read port serves dbg_byte_o (ek loop) then dbg_dk_o (dk loop).
     wire [11:0] dbgdk_ek_off = dbg_dk_idx_i - dk_bytes_rt;   // offset within ek region
-    assign ek_rd_addr = (st == ST_H) ? h_g_addr[10:0] :
+    assign ek_rd_addr = (st == ST_H || st == ST_ENC_H) ? h_g_addr[10:0] :
                         dbgdk_in_ek   ? dbgdk_ek_off[10:0]
                                       : dbg_byte_idx_i;
     // dkp BRAM read-address mux: dbg_byte (sel=1) or dbg_dk (dkp region).
@@ -600,7 +665,7 @@ module mlkem_top #(
     always @(*) begin
         st_next = st;
         case (st)
-            ST_IDLE: if (start_i) st_next = ST_G;
+            ST_IDLE: if (start_i) st_next = op_i ? ST_ENC_H : ST_G;
             ST_G:    if (sha3_vo) st_next = ST_A;
             ST_A:    if (a_pair >= kk_rt) st_next = ST_C;
             ST_C:    if (c_poly >= {1'b0, k_r, 1'b0}) st_next = ST_N;
@@ -608,6 +673,9 @@ module mlkem_top #(
             ST_M:    if (m_i >= k_r) st_next = ST_E;
             ST_E:    if (e_done) st_next = ST_H;
             ST_H:    if (h_phase == 2'd3) st_next = ST_DONE;
+            // ---- Encaps ----
+            ST_ENC_H: if (h_phase == 2'd3) st_next = ST_ENC_G;
+            ST_ENC_G: if (sha3_vo) st_next = ST_DONE;   // E0: stop here (K,r captured)
             ST_DONE: st_next = ST_IDLE;
             default: st_next = ST_IDLE;
         endcase
@@ -617,6 +685,10 @@ module mlkem_top #(
         if (!rst_n) begin
             st         <= ST_IDLE;
             k_r        <= 3'd0;
+            op_r       <= 1'b0;
+            m_r        <= 256'd0;
+            ss_r       <= 256'd0;
+            r_r        <= 256'd0;
             rho_r      <= 256'd0;
             sigma_r    <= 256'd0;
             sha3_valid <= 1'b0;
@@ -680,11 +752,25 @@ module mlkem_top #(
             ek_we  <= 1'b0;
             dkp_we <= 1'b0;
 
-            // Kick off G when entering ST_G
+            // Kick off when entering from IDLE: KeyGen starts G; Encaps captures
+            // op/m and arms the H(ek) machinery (ST_ENC_H reuses the ST_H FSM).
             if (st == ST_IDLE && start_i) begin
-                k_r        <= k_i;          // capture runtime ML-KEM param
-                sha3_valid <= 1'b1;
-                sha3_ack   <= 1'b1;
+                k_r  <= k_i;                // capture runtime ML-KEM param
+                op_r <= op_i;
+                if (op_i) begin
+                    m_r      <= msg_i;      // capture Encaps message
+                    // arm H(ek) (same fields the ST_E->ST_H arming sets)
+                    h_blk    <= 3'd0;
+                    h_byte   <= 8'd0;
+                    h_phase  <= 2'd0;       // assemble
+                    h_mbvalid<= 1'b0;
+                    h_mblast <= 1'b0;
+                    h_ack    <= 1'b1;       // ready to consume final digest
+                    h_wb_vld <= 1'b0;
+                end else begin
+                    sha3_valid <= 1'b1;
+                    sha3_ack   <= 1'b1;
+                end
             end
             // Drop valid once accepted
             if (sha3_valid && sha3_ready) sha3_valid <= 1'b0;
@@ -954,8 +1040,10 @@ module mlkem_top #(
                 h_wb_vld <= 1'b0;     // no pending writeback yet
             end
 
-            // ---- ST_H: H(ek) via multi-block SHA3-256 (6/9/12 pre-padded blocks) ----
-            if (st == ST_H) begin
+            // ---- ST_H / ST_ENC_H: H(ek) via multi-block SHA3-256 ----
+            // Same logic for KeyGen (ek just written by ST_E) and Encaps (ek
+            // preloaded into ek_bram by the TB). hek_r captures H(ek) either way.
+            if (st == ST_H || st == ST_ENC_H) begin
                 case (h_phase)
                     // assemble 136 bytes of block h_blk into h_block_r.
                     // ek BRAM read is registered: present addr for h_byte this
@@ -1005,6 +1093,19 @@ module mlkem_top #(
                     default: ; // 2'd3 done: hold
                 endcase
             end
+
+            // Arm Encaps G when H(ek) finishes: fire the 64-byte single-block
+            // G(m||H(ek)). hek_r now holds H(ek); enc_g_data = {hek_r, m_r}.
+            if (st == ST_ENC_H && st_next == ST_ENC_G) begin
+                sha3_valid <= 1'b1;
+                sha3_ack   <= 1'b1;
+            end
+            // Capture (K, r) when Encaps G completes. ss = K = low half, r = high.
+            if (st == ST_ENC_G && sha3_vo) begin
+                ss_r     <= sha3_hash[255:0];     // K (shared secret) = G bytes 0..31
+                r_r      <= sha3_hash[511:256];   // r = G bytes 32..63
+                sha3_ack <= 1'b0;
+            end
         end
     end