From 189411e8d1d458d46f44e0da86371b73e31e6100 Mon Sep 17 00:00:00 2001
From: FallenSigh <fallensigh@gmail.com>
Date: Mon, 29 Jun 2026 20:37:03 +0800
Subject: [PATCH] feat(dec): Decaps D5 - (K',r')=G(m'||h) + K-bar=J(z||c)

FO transform hash derivations (FIPS 203 Alg 17 steps 6-7), reusing the
shared SHA3 core:

- ST_DEC_G: (K',r') = G(m'||h) via the single-block SHA3-512 path (mode 11,
  dec_g_data = {hek_r, mprime_r}; h was captured into hek_r at D0 load).
  K' -> ss_r (candidate shared secret, ss_o), r' -> r_r (PRF seed for D6).
- ST_DEC_J: K-bar = J(z||c) via the multi-block absorb port (mb_en=1),
  modeled on the H(ek) machine: assemble 136-byte blocks, byte source is
  z_r (g<32), c_in_bram (32<=g<msglen), or SHAKE256 pad (0x1F suffix, last
  byte |=0x80 -- the only difference from H's 0x06). mb_* inputs muxed
  between H and J by state. K-bar -> kbar_r (dbg_kbar_o).
- FSM: MENC -> G -> J -> DONE.

Bring-up note: c_in_bram read through cin_rd_addr_r (a register) plus the
registered BRAM is 2-cycle latency, but the assemble/writeback pipeline only
budgets 1 -- so the first c byte at the z->c boundary read X and poisoned the
whole sponge. Fixed by driving cin_rd_addr combinationally from dj_c_idx
during ST_DEC_J (dropping the register stage) so data lands the next cycle.

Verified: dec D5 K=2/3/4 all cases PASS (ct 768/1088/1568B -> 6/9/12 J blocks);
K' matches the KAT shared secret for valid ciphertexts; KeyGen + Encaps
unregressed.
---
 .claude/plans/decaps_plan.md                  |    2 +-
 sync_rtl/top/TB/tb_mlkem_dec_katK_xsim.v      |   54 +-
 .../TB/vectors/decgold/dc_k2_c0_cprime.hex    |  768 ++++++++
 .../top/TB/vectors/decgold/dc_k2_c0_kbar.hex  |   32 +
 .../TB/vectors/decgold/dc_k2_c0_kprime.hex    |   32 +
 .../TB/vectors/decgold/dc_k2_c0_rprime.hex    |   32 +
 .../TB/vectors/decgold/dc_k2_c1_cprime.hex    |  768 ++++++++
 .../top/TB/vectors/decgold/dc_k2_c1_kbar.hex  |   32 +
 .../TB/vectors/decgold/dc_k2_c1_kprime.hex    |   32 +
 .../TB/vectors/decgold/dc_k2_c1_rprime.hex    |   32 +
 .../TB/vectors/decgold/dc_k2_c2_cprime.hex    |  768 ++++++++
 .../top/TB/vectors/decgold/dc_k2_c2_kbar.hex  |   32 +
 .../TB/vectors/decgold/dc_k2_c2_kprime.hex    |   32 +
 .../TB/vectors/decgold/dc_k2_c2_rprime.hex    |   32 +
 .../TB/vectors/decgold/dc_k3_c0_cprime.hex    | 1088 ++++++++++++
 .../top/TB/vectors/decgold/dc_k3_c0_kbar.hex  |   32 +
 .../TB/vectors/decgold/dc_k3_c0_kprime.hex    |   32 +
 .../TB/vectors/decgold/dc_k3_c0_rprime.hex    |   32 +
 .../TB/vectors/decgold/dc_k3_c1_cprime.hex    | 1088 ++++++++++++
 .../top/TB/vectors/decgold/dc_k3_c1_kbar.hex  |   32 +
 .../TB/vectors/decgold/dc_k3_c1_kprime.hex    |   32 +
 .../TB/vectors/decgold/dc_k3_c1_rprime.hex    |   32 +
 .../TB/vectors/decgold/dc_k3_c2_cprime.hex    | 1088 ++++++++++++
 .../top/TB/vectors/decgold/dc_k3_c2_kbar.hex  |   32 +
 .../TB/vectors/decgold/dc_k3_c2_kprime.hex    |   32 +
 .../TB/vectors/decgold/dc_k3_c2_rprime.hex    |   32 +
 .../TB/vectors/decgold/dc_k4_c0_cprime.hex    | 1568 +++++++++++++++++
 .../top/TB/vectors/decgold/dc_k4_c0_kbar.hex  |   32 +
 .../TB/vectors/decgold/dc_k4_c0_kprime.hex    |   32 +
 .../TB/vectors/decgold/dc_k4_c0_rprime.hex    |   32 +
 .../TB/vectors/decgold/dc_k4_c1_cprime.hex    | 1568 +++++++++++++++++
 .../top/TB/vectors/decgold/dc_k4_c1_kbar.hex  |   32 +
 .../TB/vectors/decgold/dc_k4_c1_kprime.hex    |   32 +
 .../TB/vectors/decgold/dc_k4_c1_rprime.hex    |   32 +
 .../TB/vectors/decgold/dc_k4_c2_cprime.hex    | 1568 +++++++++++++++++
 .../top/TB/vectors/decgold/dc_k4_c2_kbar.hex  |   32 +
 .../TB/vectors/decgold/dc_k4_c2_kprime.hex    |   32 +
 .../TB/vectors/decgold/dc_k4_c2_rprime.hex    |   32 +
 sync_rtl/top/mlkem_top.v                      |  181 +-
 39 files changed, 11352 insertions(+), 21 deletions(-)
 create mode 100644 sync_rtl/top/TB/vectors/decgold/dc_k2_c0_cprime.hex
 create mode 100644 sync_rtl/top/TB/vectors/decgold/dc_k2_c0_kbar.hex
 create mode 100644 sync_rtl/top/TB/vectors/decgold/dc_k2_c0_kprime.hex
 create mode 100644 sync_rtl/top/TB/vectors/decgold/dc_k2_c0_rprime.hex
 create mode 100644 sync_rtl/top/TB/vectors/decgold/dc_k2_c1_cprime.hex
 create mode 100644 sync_rtl/top/TB/vectors/decgold/dc_k2_c1_kbar.hex
 create mode 100644 sync_rtl/top/TB/vectors/decgold/dc_k2_c1_kprime.hex
 create mode 100644 sync_rtl/top/TB/vectors/decgold/dc_k2_c1_rprime.hex
 create mode 100644 sync_rtl/top/TB/vectors/decgold/dc_k2_c2_cprime.hex
 create mode 100644 sync_rtl/top/TB/vectors/decgold/dc_k2_c2_kbar.hex
 create mode 100644 sync_rtl/top/TB/vectors/decgold/dc_k2_c2_kprime.hex
 create mode 100644 sync_rtl/top/TB/vectors/decgold/dc_k2_c2_rprime.hex
 create mode 100644 sync_rtl/top/TB/vectors/decgold/dc_k3_c0_cprime.hex
 create mode 100644 sync_rtl/top/TB/vectors/decgold/dc_k3_c0_kbar.hex
 create mode 100644 sync_rtl/top/TB/vectors/decgold/dc_k3_c0_kprime.hex
 create mode 100644 sync_rtl/top/TB/vectors/decgold/dc_k3_c0_rprime.hex
 create mode 100644 sync_rtl/top/TB/vectors/decgold/dc_k3_c1_cprime.hex
 create mode 100644 sync_rtl/top/TB/vectors/decgold/dc_k3_c1_kbar.hex
 create mode 100644 sync_rtl/top/TB/vectors/decgold/dc_k3_c1_kprime.hex
 create mode 100644 sync_rtl/top/TB/vectors/decgold/dc_k3_c1_rprime.hex
 create mode 100644 sync_rtl/top/TB/vectors/decgold/dc_k3_c2_cprime.hex
 create mode 100644 sync_rtl/top/TB/vectors/decgold/dc_k3_c2_kbar.hex
 create mode 100644 sync_rtl/top/TB/vectors/decgold/dc_k3_c2_kprime.hex
 create mode 100644 sync_rtl/top/TB/vectors/decgold/dc_k3_c2_rprime.hex
 create mode 100644 sync_rtl/top/TB/vectors/decgold/dc_k4_c0_cprime.hex
 create mode 100644 sync_rtl/top/TB/vectors/decgold/dc_k4_c0_kbar.hex
 create mode 100644 sync_rtl/top/TB/vectors/decgold/dc_k4_c0_kprime.hex
 create mode 100644 sync_rtl/top/TB/vectors/decgold/dc_k4_c0_rprime.hex
 create mode 100644 sync_rtl/top/TB/vectors/decgold/dc_k4_c1_cprime.hex
 create mode 100644 sync_rtl/top/TB/vectors/decgold/dc_k4_c1_kbar.hex
 create mode 100644 sync_rtl/top/TB/vectors/decgold/dc_k4_c1_kprime.hex
 create mode 100644 sync_rtl/top/TB/vectors/decgold/dc_k4_c1_rprime.hex
 create mode 100644 sync_rtl/top/TB/vectors/decgold/dc_k4_c2_cprime.hex
 create mode 100644 sync_rtl/top/TB/vectors/decgold/dc_k4_c2_kbar.hex
 create mode 100644 sync_rtl/top/TB/vectors/decgold/dc_k4_c2_kprime.hex
 create mode 100644 sync_rtl/top/TB/vectors/decgold/dc_k4_c2_rprime.hex

diff --git a/.claude/plans/decaps_plan.md b/.claude/plans/decaps_plan.md
index fc6c8ea..2029012 100644
--- a/.claude/plans/decaps_plan.md
+++ b/.claude/plans/decaps_plan.md
@@ -66,7 +66,7 @@
 - **D2 — s_hat 解码 + u_hat = NTT(u')** ✅:复用 Encaps TDEC 机(ST_DEC_SDEC),字节源从 ek 切到 dkp_bram(td_byte mux + dkp_rd_addr 在 SDEC 走 td_ekaddr),s_hat 写 bank_a slot j*K(与 t_hat 同布局,D3 MAC 可直接读)。复用前向 NTT 机(ST_DEC_NTT,n_slot_max=k_r)对 bank_se rel 0..K-1 的 u' 原地变换成 u_hat。**踩坑:NTT 原地覆盖 u' → verify_d1 复查 u' 必失败;改为 verify_d1 只查 v'(bank_t 未动),u' 正确性由 u_hat==NTT(u') golden 传递性证明。** K=2/3/4 全过,KG/Enc 回归通过。
 - **D3 — w = v' − INTT(Σ s∘u_hat)** ✅:复用 Encaps V 机(ST_DEC_W,u_row=0 单多项式)。MAC s_hat[j](bank_a slot j*K)∘ u_hat[j](bank_se rel j)→psum bank_t[UPSUM],与 V MAC 完全同址,免改。INTT 原地。SUB:w = v' − psum,(v'−psum) 负则 +Q。**关键:v'/psum 读口冲突 → D1 把 v' 落到 bank_a slot DEC_VASLOT=1(s_hat 在 j*K,slot 1 恒空 K≥2),SUB 时 psum(bank_t)+v'(bank_a)并行读,正如 V-ADD 并读 psum+e2。** K=2/3/4 w 全过。
 - **D4 — m' = byteEncode₁(Compress₁(w))** ✅:ST_DEC_MENC,逐系数读 bank_t[UPSUM] 的 w,Compress₁(w)=1 iff 832<w≤2496(Q=3329),LSB-first 打包进 mprime_r[255:0],经 dbg_mprime_o 暴露。TB verify_d4 对 32 字节 golden(== KAT 解密的 m'==原始 m)。K=2/3/4 全过,KG/Enc 回归通过。K-PKE.Decrypt 硬件全链路打通。
-- **D5 — G(m'‖h) → (K',r') + J(z‖c) → K̄**:G 复用、J 多块(0x1F pad)。dbg 对 K'/r'/K̄。
+- **D5 — G(m'‖h) → (K',r') + J(z‖c) → K̄** ✅:G 复用单块 SHA3-512 路径(ST_DEC_G,mode=11,dec_g_data={hek_r,mprime_r}),输出 K'→ss_r(候选 ss,ss_o),r'→r_r(D6 PRF 种子,dbg_r_o)。J 复用多块吸收口(ST_DEC_J,mb_en=1),仿照 H(ek) 机器组装 136B/块,字节源 g<32 取 z_r、32≤g<msglen 取 c_in_bram、否则 SHAKE256 pad(0x1F 后缀,末字节|0x80,与 H 的 0x06 唯一区别)。mb_* 端口按 ST_DEC_J 在 H/J 间多路选择。K̄→kbar_r(dbg_kbar_o)。**踩坑:c_in_bram 读经 cin_rd_addr_r 寄存器 + BRAM 寄存 = 2 拍延迟,而组装/写回流水只容 1 拍 → z→c 边界首个 c 字节(byte32)读到 X,毒化整个 keccak。改为 ST_DEC_J 时 cin_rd_addr 组合直接取 dj_c_idx(去掉寄存器级),数据次拍到达正好对齐写回。** K=2/3/4(密文 768/1088/1568B → 6/9/12 块)全过;K'==KAT ss(有效密文)验证 FO 正确;KG/Enc 回归通过。
 - **D6 — c' = Encrypt(ek_pke,m',r')**:复用 Encaps E1–E7 写 ct_bram。dbg 对 c'==KAT.ct(有效 ct 时)。
 - **D7 — 比较 + 拒绝 mux + 端到端 KAT**:c'==c 常量时间比较,ss=mux。干净 TB:
   - 有效 ct(KAT.ct):ss==KAT.ss(c'==c → K')。
diff --git a/sync_rtl/top/TB/tb_mlkem_dec_katK_xsim.v b/sync_rtl/top/TB/tb_mlkem_dec_katK_xsim.v
index bde0deb..7106083 100644
--- a/sync_rtl/top/TB/tb_mlkem_dec_katK_xsim.v
+++ b/sync_rtl/top/TB/tb_mlkem_dec_katK_xsim.v
@@ -88,15 +88,16 @@ module tb_mlkem_dec_katK_xsim;
         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("=== Decaps D4 done in %0d cyc ===", c);
+        $display("=== Decaps D5 done in %0d cyc ===", c);
 
         verify_d0;
         verify_d1;
         verify_d2;
         verify_d3;
         verify_d4;
-        if (errors == 0) $display("K=%0d CASE %0d PASS (D4): w + m' recovery OK", KP, casenum);
-        else             $display("K=%0d CASE %0d FAIL (D4): %0d total errors", KP, casenum, errors);
+        verify_d5;
+        if (errors == 0) $display("K=%0d CASE %0d PASS (D5): K'/r' = G(m'||h), K-bar = J(z||c) OK", KP, casenum);
+        else             $display("K=%0d CASE %0d FAIL (D5): %0d total errors", KP, casenum, errors);
         $finish;
     end
 
@@ -286,4 +287,51 @@ module tb_mlkem_dec_katK_xsim;
             errors = errors + be;
         end
     endtask
+
+    // D5: verify K' (ss_o), r' (dbg_r_o), K-bar (dbg_kbar_o) against golden.
+    reg [7:0] kp_b [0:31];
+    reg [7:0] rp_b [0:31];
+    reg [7:0] kb_b [0:31];
+    task verify_d5;
+        integer j, be;
+        reg [8*100-1:0] fn;
+        begin
+            // K' = G(m'||h) low half -> ss_o
+            $sformat(fn, "sync_rtl/top/TB/vectors/decgold/dc_k%0d_c%0d_kprime.hex", KP, casenum);
+            $readmemh(fn, kp_b);
+            be = 0;
+            for (j = 0; j < 32; j = j + 1)
+                if (ss_o[8*j +: 8] !== kp_b[j]) begin
+                    if (be < 4) $display("  K'[%0d] got=%02x exp=%02x", j, ss_o[8*j +: 8], kp_b[j]);
+                    be = be + 1;
+                end
+            if (be == 0) $display("  PASS: K' == golden (32 bytes)");
+            else         $display("  FAIL: K' %0d byte mismatches", be);
+            errors = errors + be;
+            // r' = G(m'||h) high half -> dbg_r_o
+            $sformat(fn, "sync_rtl/top/TB/vectors/decgold/dc_k%0d_c%0d_rprime.hex", KP, casenum);
+            $readmemh(fn, rp_b);
+            be = 0;
+            for (j = 0; j < 32; j = j + 1)
+                if (dbg_r_o[8*j +: 8] !== rp_b[j]) begin
+                    if (be < 4) $display("  r'[%0d] got=%02x exp=%02x", j, dbg_r_o[8*j +: 8], rp_b[j]);
+                    be = be + 1;
+                end
+            if (be == 0) $display("  PASS: r' == golden (32 bytes)");
+            else         $display("  FAIL: r' %0d byte mismatches", be);
+            errors = errors + be;
+            // K-bar = J(z||c) -> dbg_kbar_o
+            $sformat(fn, "sync_rtl/top/TB/vectors/decgold/dc_k%0d_c%0d_kbar.hex", KP, casenum);
+            $readmemh(fn, kb_b);
+            be = 0;
+            for (j = 0; j < 32; j = j + 1)
+                if (dbg_kbar_o[8*j +: 8] !== kb_b[j]) begin
+                    if (be < 4) $display("  K-bar[%0d] got=%02x exp=%02x", j, dbg_kbar_o[8*j +: 8], kb_b[j]);
+                    be = be + 1;
+                end
+            if (be == 0) $display("  PASS: K-bar == golden (32 bytes)");
+            else         $display("  FAIL: K-bar %0d byte mismatches", be);
+            errors = errors + be;
+        end
+    endtask
 endmodule
diff --git a/sync_rtl/top/TB/vectors/decgold/dc_k2_c0_cprime.hex b/sync_rtl/top/TB/vectors/decgold/dc_k2_c0_cprime.hex
new file mode 100644
index 0000000..0059d6c
--- /dev/null
+++ b/sync_rtl/top/TB/vectors/decgold/dc_k2_c0_cprime.hex
@@ -0,0 +1,768 @@
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diff --git a/sync_rtl/top/TB/vectors/decgold/dc_k2_c0_kbar.hex b/sync_rtl/top/TB/vectors/decgold/dc_k2_c0_kbar.hex
new file mode 100644
index 0000000..d3c1c83
--- /dev/null
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diff --git a/sync_rtl/top/TB/vectors/decgold/dc_k2_c0_kprime.hex b/sync_rtl/top/TB/vectors/decgold/dc_k2_c0_kprime.hex
new file mode 100644
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diff --git a/sync_rtl/top/TB/vectors/decgold/dc_k2_c0_rprime.hex b/sync_rtl/top/TB/vectors/decgold/dc_k2_c0_rprime.hex
new file mode 100644
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diff --git a/sync_rtl/top/TB/vectors/decgold/dc_k2_c1_cprime.hex b/sync_rtl/top/TB/vectors/decgold/dc_k2_c1_cprime.hex
new file mode 100644
index 0000000..34e28af
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diff --git a/sync_rtl/top/TB/vectors/decgold/dc_k2_c1_kbar.hex b/sync_rtl/top/TB/vectors/decgold/dc_k2_c1_kbar.hex
new file mode 100644
index 0000000..811e66e
--- /dev/null
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diff --git a/sync_rtl/top/TB/vectors/decgold/dc_k2_c1_kprime.hex b/sync_rtl/top/TB/vectors/decgold/dc_k2_c1_kprime.hex
new file mode 100644
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new file mode 100644
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new file mode 100644
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diff --git a/sync_rtl/top/TB/vectors/decgold/dc_k2_c2_kbar.hex b/sync_rtl/top/TB/vectors/decgold/dc_k2_c2_kbar.hex
new file mode 100644
index 0000000..ed600e6
--- /dev/null
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diff --git a/sync_rtl/top/TB/vectors/decgold/dc_k2_c2_kprime.hex b/sync_rtl/top/TB/vectors/decgold/dc_k2_c2_kprime.hex
new file mode 100644
index 0000000..524f510
--- /dev/null
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diff --git a/sync_rtl/top/TB/vectors/decgold/dc_k2_c2_rprime.hex b/sync_rtl/top/TB/vectors/decgold/dc_k2_c2_rprime.hex
new file mode 100644
index 0000000..763260f
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diff --git a/sync_rtl/top/TB/vectors/decgold/dc_k3_c0_cprime.hex b/sync_rtl/top/TB/vectors/decgold/dc_k3_c0_cprime.hex
new file mode 100644
index 0000000..23b1d06
--- /dev/null
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diff --git a/sync_rtl/top/TB/vectors/decgold/dc_k3_c0_kbar.hex b/sync_rtl/top/TB/vectors/decgold/dc_k3_c0_kbar.hex
new file mode 100644
index 0000000..e944066
--- /dev/null
+++ b/sync_rtl/top/TB/vectors/decgold/dc_k3_c0_kbar.hex
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diff --git a/sync_rtl/top/TB/vectors/decgold/dc_k3_c0_kprime.hex b/sync_rtl/top/TB/vectors/decgold/dc_k3_c0_kprime.hex
new file mode 100644
index 0000000..d0438db
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diff --git a/sync_rtl/top/TB/vectors/decgold/dc_k3_c1_cprime.hex b/sync_rtl/top/TB/vectors/decgold/dc_k3_c1_cprime.hex
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diff --git a/sync_rtl/top/TB/vectors/decgold/dc_k3_c1_kbar.hex b/sync_rtl/top/TB/vectors/decgold/dc_k3_c1_kbar.hex
new file mode 100644
index 0000000..3e71d2c
--- /dev/null
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diff --git a/sync_rtl/top/TB/vectors/decgold/dc_k3_c1_kprime.hex b/sync_rtl/top/TB/vectors/decgold/dc_k3_c1_kprime.hex
new file mode 100644
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diff --git a/sync_rtl/top/TB/vectors/decgold/dc_k3_c1_rprime.hex b/sync_rtl/top/TB/vectors/decgold/dc_k3_c1_rprime.hex
new file mode 100644
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diff --git a/sync_rtl/top/TB/vectors/decgold/dc_k3_c2_cprime.hex b/sync_rtl/top/TB/vectors/decgold/dc_k3_c2_cprime.hex
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new file mode 100644
index 0000000..ef950a4
--- /dev/null
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diff --git a/sync_rtl/top/TB/vectors/decgold/dc_k3_c2_kprime.hex b/sync_rtl/top/TB/vectors/decgold/dc_k3_c2_kprime.hex
new file mode 100644
index 0000000..479ea86
--- /dev/null
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diff --git a/sync_rtl/top/TB/vectors/decgold/dc_k3_c2_rprime.hex b/sync_rtl/top/TB/vectors/decgold/dc_k3_c2_rprime.hex
new file mode 100644
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diff --git a/sync_rtl/top/TB/vectors/decgold/dc_k4_c0_cprime.hex b/sync_rtl/top/TB/vectors/decgold/dc_k4_c0_cprime.hex
new file mode 100644
index 0000000..95b63bf
--- /dev/null
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index 0000000..6f2271f
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diff --git a/sync_rtl/top/TB/vectors/decgold/dc_k4_c0_kprime.hex b/sync_rtl/top/TB/vectors/decgold/dc_k4_c0_kprime.hex
new file mode 100644
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diff --git a/sync_rtl/top/TB/vectors/decgold/dc_k4_c0_rprime.hex b/sync_rtl/top/TB/vectors/decgold/dc_k4_c0_rprime.hex
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diff --git a/sync_rtl/top/TB/vectors/decgold/dc_k4_c1_cprime.hex b/sync_rtl/top/TB/vectors/decgold/dc_k4_c1_cprime.hex
new file mode 100644
index 0000000..583ba92
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new file mode 100644
index 0000000..e43325c
--- /dev/null
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diff --git a/sync_rtl/top/TB/vectors/decgold/dc_k4_c1_kprime.hex b/sync_rtl/top/TB/vectors/decgold/dc_k4_c1_kprime.hex
new file mode 100644
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diff --git a/sync_rtl/top/TB/vectors/decgold/dc_k4_c1_rprime.hex b/sync_rtl/top/TB/vectors/decgold/dc_k4_c1_rprime.hex
new file mode 100644
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diff --git a/sync_rtl/top/TB/vectors/decgold/dc_k4_c2_cprime.hex b/sync_rtl/top/TB/vectors/decgold/dc_k4_c2_cprime.hex
new file mode 100644
index 0000000..0772b1a
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diff --git a/sync_rtl/top/TB/vectors/decgold/dc_k4_c2_kbar.hex b/sync_rtl/top/TB/vectors/decgold/dc_k4_c2_kbar.hex
new file mode 100644
index 0000000..0536d9c
--- /dev/null
+++ b/sync_rtl/top/TB/vectors/decgold/dc_k4_c2_kbar.hex
@@ -0,0 +1,32 @@
+70
+ee
+c6
+f0
+65
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diff --git a/sync_rtl/top/TB/vectors/decgold/dc_k4_c2_kprime.hex b/sync_rtl/top/TB/vectors/decgold/dc_k4_c2_kprime.hex
new file mode 100644
index 0000000..5f0c4f8
--- /dev/null
+++ b/sync_rtl/top/TB/vectors/decgold/dc_k4_c2_kprime.hex
@@ -0,0 +1,32 @@
+72
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diff --git a/sync_rtl/top/TB/vectors/decgold/dc_k4_c2_rprime.hex b/sync_rtl/top/TB/vectors/decgold/dc_k4_c2_rprime.hex
new file mode 100644
index 0000000..cd1f083
--- /dev/null
+++ b/sync_rtl/top/TB/vectors/decgold/dc_k4_c2_rprime.hex
@@ -0,0 +1,32 @@
+b3
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diff --git a/sync_rtl/top/mlkem_top.v b/sync_rtl/top/mlkem_top.v
index 8523f01..8cd00c9 100644
--- a/sync_rtl/top/mlkem_top.v
+++ b/sync_rtl/top/mlkem_top.v
@@ -195,7 +195,11 @@ module mlkem_top #(
         .rd_addr(cin_rd_addr), .rd_data(cin_rd_data),
         .wr_en(c_in_we), .wr_addr(c_in_addr), .wr_data(c_in_byte)
     );
-    assign cin_rd_addr = cin_rd_addr_r;
+    // c_in read addr: D5 J presents dj_c_idx combinationally (no extra register
+    // stage) so the registered BRAM read yields the byte 1 cycle later, matching
+    // the assemble/writeback pipeline. Otherwise the registered cin_rd_addr_r
+    // (D1 walker / idle) drives it.
+    assign cin_rd_addr = (st == ST_DEC_J) ? dj_c_idx[10:0] : cin_rd_addr_r;
 
     // ================================================================
     // Polynomial storage, sized for KMAX (worst case). Runtime k uses a
@@ -482,6 +486,8 @@ module mlkem_top #(
     localparam ST_DEC_NTT    = 5'd23; // D2: u_hat[i] = NTT(u'[i]) in place (bank_se rel i)
     localparam ST_DEC_W      = 5'd24; // D3: w = v' - INTT(sum_j s_hat[j] o u_hat[j])
     localparam ST_DEC_MENC   = 5'd25; // D4: m' = byteEncode_1(Compress_1(w))
+    localparam ST_DEC_G      = 5'd26; // D5: (K',r') = G(m' || h), SHA3-512 single block
+    localparam ST_DEC_J      = 5'd27; // D5: K-bar = J(z || c), multi-block SHAKE256
     localparam ST_DONE   = 5'd31;
 
     reg [4:0]   st, st_next;
@@ -524,7 +530,9 @@ module mlkem_top #(
     reg          sha3_ack;       // consumer ready for hash
     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;
+    wire [511:0] dec_g_data = {hek_r, mprime_r};          // Decaps D5 G: m' || h, 64 bytes
+    wire [511:0] g_data = (st == ST_ENC_G) ? enc_g_data :
+                          (st == ST_DEC_G) ? dec_g_data : kg_g_data;
 
     // ================================================================
     // Shared keccak_core + phase mux (3 consumers -> 1 core)
@@ -551,7 +559,8 @@ module mlkem_top #(
     // 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);
+                    (st == ST_ENC_H) || (st == ST_ENC_G) ||
+                    (st == ST_DEC_G) || (st == ST_DEC_J);
     wire sel_snt  = (st == ST_A) || (st == ST_ENC_A);
     wire sel_cbd  = (st == ST_C) || (st == ST_ENC_C);
 
@@ -578,15 +587,17 @@ module mlkem_top #(
         .ready_i(1'b1)               // consumers always accept (kc_ready_i=1)
     );
 
-    // ---- single shared sha3_top serving BOTH G and H ----
-    // G (ST_G) uses single-block mode (mb_en=0); H(ek) (ST_H) uses the
-    // 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) || (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;
+    // G/H/J share one sha3_top. Single-block (mb_en=0): KeyGen G (ST_G, mode 00),
+    // Encaps G (ST_ENC_G, mode 11), Decaps D5 G (ST_DEC_G, mode 11). Multi-block
+    // absorb (mb_en=1): H(ek) (ST_H/ST_ENC_H, SHA3-256 pad) and Decaps D5 J
+    // (ST_DEC_J, SHAKE256 pad over z||c). mb_* inputs are muxed by phase.
+    wire sha3_mb_en = (st == ST_H) || (st == ST_ENC_H) || (st == ST_DEC_J);
+    wire [1:0] sha3_mode = (st == ST_ENC_G || st == ST_DEC_G) ? 2'b11 : 2'b00;
+    // multi-block feed mux: J (ST_DEC_J) drives dj_*, else H drives h_*.
+    wire [1087:0] mb_block_mux = (st == ST_DEC_J) ? dj_block_r : h_block_r;
+    wire          mb_valid_mux = (st == ST_DEC_J) ? dj_mbvalid : h_mbvalid;
+    wire          mb_last_mux  = (st == ST_DEC_J) ? dj_mblast  : h_mblast;
+    wire          mb_ack_mux   = (st == ST_DEC_J) ? dj_ack     : h_ack;
     sha3_top_shared u_sha3 (
         .clk(clk), .rst_n(rst_n),
         .mode(sha3_mode),             // G = SHA3-512 (only used when mb_en=0)
@@ -595,11 +606,11 @@ module mlkem_top #(
         .ready_o(sha3_ready),
         .hash_o(sha3_hash),
         .valid_o(sha3_vo),
-        .ready_i(sha3_mb_en ? h_ack : sha3_ack),
+        .ready_i(sha3_mb_en ? mb_ack_mux : sha3_ack),
         .mb_en(sha3_mb_en),
-        .mb_block_i(h_block_r),
-        .mb_valid_i(h_mbvalid),
-        .mb_last_i(h_mblast),
+        .mb_block_i(mb_block_mux),
+        .mb_valid_i(mb_valid_mux),
+        .mb_last_i(mb_last_mux),
         .mb_ready_o(h_mbready),
         // shared keccak_core interface (gated by phase in the mux below)
         .kc_state_o(kc_state_o),
@@ -631,6 +642,43 @@ module mlkem_top #(
     reg  [7:0]    h_wb_pad;        // pad constant to use if g is out of ek range
     reg           h_wb_inek;       // 1 if g is within ek range (use BRAM data)
 
+    // ---- Decaps D5 J(z||c) multi-block SHAKE256 state ----
+    // Message = z (32 B, from z_r) || c (ct_bytes_rt B, from c_in_bram). Rate=136.
+    // SHAKE256 pad: byte at msg_len = 0x1F, last byte of last block |= 0x80.
+    // Reuses the shared u_sha3 mb_* port (muxed by ST_DEC_J above).
+    reg  [1087:0] dj_block_r;      // current pre-padded rate block
+    reg           dj_mbvalid;
+    reg           dj_mblast;
+    reg           dj_ack;
+    reg  [3:0]    dj_blk;          // block index 0..DJ_NBLK-1 (z||c up to ~1600B -> <=12 blks)
+    reg  [7:0]    dj_byte;         // 0..136 byte being assembled
+    reg  [1:0]    dj_phase;        // 0=assemble 1=feed 2=wait-perm 3=done
+    reg           dj_done;
+    // writeback pipeline (c_in_bram registered read, 1-cyc latency)
+    reg           dj_wb_vld;
+    reg  [7:0]    dj_wb_idx;       // position within 136-byte block
+    reg           dj_wb_inc;       // 1 if global byte g is within c range (use BRAM)
+    reg           dj_wb_inz;       // 1 if g < 32 (use z_r byte)
+    reg  [7:0]    dj_wb_pad;       // pad constant if g out of msg range
+    reg  [4:0]    dj_wb_zidx;      // z byte index (g) when inz
+    // J message length = 32 (z) + ct_bytes_rt; total padded blocks.
+    wire [11:0] dj_msglen = 12'd32 + {1'b0, ct_bytes_rt};
+    wire [11:0] dj_last_byte = (dj_msglen / 12'd136) * 12'd136 + 12'd135; // last byte of final block
+    wire [3:0]  dj_nblk   = (dj_msglen / 12'd136) + 4'd1;
+    // global byte index for the address presented this cycle (assemble)
+    wire [11:0] dj_g = {4'd0, dj_blk} * 12'd136 + {4'd0, dj_byte};
+    // c_in_bram byte index (when g>=32): g-32
+    wire [11:0] dj_c_idx = dj_g - 12'd32;
+    // SHAKE256 pad constant for global byte g
+    function [7:0] dj_padconst(input [11:0] g);
+        begin
+            if (g == dj_last_byte && g == dj_msglen) dj_padconst = 8'h9f; // 0x1F|0x80
+            else if (g == dj_msglen)   dj_padconst = 8'h1f;
+            else if (g == dj_last_byte) dj_padconst = 8'h80;
+            else                        dj_padconst = 8'h00;
+        end
+    endfunction
+
     // h_hash / h_vo are now served by the shared u_sha3 above (mb_en=1 during
     // ST_H). They alias the single core's outputs; the H consumer logic below
     // already gates on st==ST_H, and u_sha3's valid_o/hash_o are mb-selected.
@@ -1075,7 +1123,10 @@ module mlkem_top #(
             // D3: w = v' - INTT(sum_j s_hat[j] o u_hat[j]). Single output poly
             // (u_row 0..0); MAC->INTT->SUB, then D4 encodes m'.
             ST_DEC_W:    if (u_row >= 3'd1) st_next = ST_DEC_MENC;
-            ST_DEC_MENC: if (men_done) st_next = ST_DONE;
+            ST_DEC_MENC: if (men_done) st_next = ST_DEC_G;
+            // D5: (K',r') = G(m'||h) single-block, then K-bar = J(z||c) multi-block.
+            ST_DEC_G:    if (sha3_vo) st_next = ST_DEC_J;
+            ST_DEC_J:    if (dj_done) st_next = ST_DONE;
             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;
@@ -1220,6 +1271,15 @@ module mlkem_top #(
             men_ph     <= 2'd0;
             men_done   <= 1'b0;
             mprime_r   <= 256'd0;
+            dj_blk     <= 4'd0;
+            dj_byte    <= 8'd0;
+            dj_phase   <= 2'd0;
+            dj_mbvalid <= 1'b0;
+            dj_mblast  <= 1'b0;
+            dj_ack     <= 1'b0;
+            dj_done    <= 1'b0;
+            dj_wb_vld  <= 1'b0;
+            dj_block_r <= 1088'd0;
             h_blk      <= 3'd0;
             h_byte     <= 8'd0;
             h_phase    <= 2'd0;
@@ -1885,6 +1945,93 @@ module mlkem_top #(
                 sha3_ack <= 1'b0;
             end
 
+            // Arm Decaps D5 G when m' is ready (ST_DEC_MENC -> ST_DEC_G): fire the
+            // 64-byte single-block G(m'||h). dec_g_data = {hek_r, mprime_r}.
+            if (st == ST_DEC_MENC && st_next == ST_DEC_G) begin
+                sha3_valid <= 1'b1;
+                sha3_ack   <= 1'b1;
+            end
+            // Capture (K', r') when D5 G completes. K' = low half (candidate ss),
+            // r' = high half (PRF seed for D6 re-encrypt). Reuse ss_r / r_r.
+            if (st == ST_DEC_G && sha3_vo) begin
+                ss_r     <= sha3_hash[255:0];     // K' = G bytes 0..31
+                r_r      <= sha3_hash[511:256];   // r' = G bytes 32..63
+                sha3_ack <= 1'b0;
+            end
+
+            // Arm D5 J(z||c) when G completes (ST_DEC_G -> ST_DEC_J): assemble the
+            // first 136-byte block. dj_ack high to consume the final digest.
+            if (st == ST_DEC_G && st_next == ST_DEC_J) begin
+                dj_blk    <= 4'd0;
+                dj_byte   <= 8'd0;
+                dj_phase  <= 2'd0;
+                dj_mbvalid<= 1'b0;
+                dj_mblast <= 1'b0;
+                dj_ack    <= 1'b1;
+                dj_done   <= 1'b0;
+                dj_wb_vld <= 1'b0;
+                cin_rd_addr_r <= 11'd0;   // present c byte 0 (g=32 -> c_idx 0)
+            end
+
+            // ---- ST_DEC_J: K-bar = J(z||c) multi-block SHAKE256 ----
+            // Mirror of the H(ek) multi-block machine. Byte source by global g:
+            //   g < 32           -> z_r byte g
+            //   32 <= g < msglen -> c_in_bram byte (g-32), registered read
+            //   else             -> SHAKE256 pad constant
+            // c_in_bram read is registered: present c_idx for dj_byte this cycle,
+            // write back the byte that arrived for the addr presented last cycle.
+            if (st == ST_DEC_J && !dj_done) begin
+                case (dj_phase)
+                    2'd0: begin
+                        // writeback the byte read for the previous address
+                        if (dj_wb_vld) begin
+                            if (dj_wb_inz)
+                                dj_block_r[dj_wb_idx*8 +: 8] <= z_r[dj_wb_zidx*8 +: 8];
+                            else if (dj_wb_inc)
+                                dj_block_r[dj_wb_idx*8 +: 8] <= cin_rd_data;
+                            else
+                                dj_block_r[dj_wb_idx*8 +: 8] <= dj_wb_pad;
+                        end
+                        if (dj_byte <= 8'd135) begin
+                            dj_wb_vld  <= 1'b1;
+                            dj_wb_idx  <= dj_byte;
+                            dj_wb_inz  <= (dj_g < 12'd32);
+                            dj_wb_inc  <= (dj_g >= 12'd32) && (dj_g < dj_msglen);
+                            dj_wb_zidx <= dj_g[4:0];
+                            dj_wb_pad  <= dj_padconst(dj_g);
+                            // c_in addr is presented combinationally (cin_rd_addr
+                            // mux uses dj_c_idx during ST_DEC_J); data lands next
+                            // cycle, matching this byte's writeback.
+                            dj_byte    <= dj_byte + 8'd1;
+                        end else begin
+                            dj_wb_vld  <= 1'b0;
+                            dj_byte    <= 8'd0;
+                            dj_mbvalid <= 1'b1;
+                            dj_mblast  <= (dj_blk == dj_nblk - 4'd1);
+                            dj_phase   <= 2'd1;
+                        end
+                    end
+                    2'd1: begin
+                        if (dj_mbvalid && !h_mbready) begin
+                            dj_mbvalid <= 1'b0;
+                            dj_mblast  <= 1'b0;
+                            dj_phase   <= 2'd2;
+                        end
+                    end
+                    2'd2: begin
+                        if (sha3_vo) begin
+                            kbar_r  <= sha3_hash[255:0];
+                            dj_done <= 1'b1;
+                            dj_phase<= 2'd3;
+                        end else if (h_mbready) begin
+                            dj_blk   <= dj_blk + 4'd1;
+                            dj_phase <= 2'd0;
+                        end
+                    end
+                    default: ; // done
+                endcase
+            end
+
             // Arm rho-load when entering ST_ENC_LOAD. rho = ek[384k .. 384k+31].
             if (st == ST_ENC_G && st_next == ST_ENC_LOAD) begin
                 rl_idx  <= 6'd0;