signer/plans/menu_gap_analysis.md

Menu Gap Analysis: C main.c vs Rust signer

Source of truth: the C code in src/main.c, NOT documents/signer_menus.md (which is stale — e.g. it claims the wizard prompts Require interactive approval? [Y/n], but the actual C code hardcodes requires_approval = 0 and never prompts).

This document compares every interactive menu/screen in the C implementation against the current Rust port in src/tui.rs and src/main.rs.

Legend: ✅ matches, ⚠️ partial, ❌ missing/divergent.

---

Menu 1 — Unlock / Mnemonic source

C (prompt_load_mnemonic_tui):

• Frame: n_signer v<ver> > Unlock, content screen title "Load mnemonic"
• Prompt: Mnemonic source: [E]nter existing or [G]enerate new
• Default is E; you can also paste full mnemonic here.
• q/Q/x/X (single char) → exit with error
• Paste detection: if input contains a space and doesn't start with g/G, treat as mnemonic and validate directly
• g/G → generate 12-word, print numbered "%2d. %s", warning Generated mnemonic (WRITE THIS DOWN - it will not be shown again):, then Press Enter after writing down your mnemonic to continue.
• Otherwise → second screen > Unlock / "Enter mnemonic", Enter mnemonic (12/15/18/21/24 words):, q/x to exit
• 10 invalid attempts then Too many invalid mnemonic attempts (10). Exiting.
• Success: Seed phrase is valid and accepted.

Rust (load_mnemonic_tui):

• Frame: signer v<ver> > Unlock, title "Enter mnemonic phrase"
• Prompt: Enter your BIP-39 mnemonic phrase, or 'g' to generate a new one.
• g/G → generate, numbered, warning ✅
• Otherwise → load as mnemonic (paste works implicitly) ⚠️
• No q/x exit ❌
• No 10-attempt limit ❌
• No second "Enter mnemonic" screen ❌
• No explicit paste-detection branch (works by accident) ⚠️

Feature	C	Rust	Status
[E]/[G] prompt text	yes	different wording	⚠️
q/x to exit	yes	no	❌
Paste detection	yes	implicit	⚠️
10-attempt limit	yes	no	❌
Generate + warning	yes	yes	✅
Second "Enter mnemonic" screen	yes	no	❌

---

Menu 2 — Define a role / Role preset menu

C (prompt_named_path_roles):

• for(;;) loop, content screen title "Define a role — bind a role name to a derivation path template"
• 10 presets (1–10): 1=Standard Nostr, 2=Nostr range, 3=Nostr agent, 4=SSH, 5=Age, 6=ML-DSA-65, 7=SLH-DSA-128s, 8=ML-KEM-768, 9=OTP role, 10=Custom path
• Select [1]: (default 1 if empty)
• Role name prompt: Role name [%s]: with editable line + default
• Duplicate → Role '%s' already exists, skipping. + continue
• Choice 9 (OTP): prompts OTP pad directory (e.g. /media/usb0): and OTP pad name (e.g. mypad):, binds pad immediately, registers role with curve_str="otp", requires_approval=0
• Choice 10 (Custom): curve menu

    Curve:
      1) secp256k1    (Nostr, Bitcoin)
      2) ed25519      (SSH)
      3) x25519       (key agreement, Age)
      4) ml-dsa-65    (post-quantum signatures)
      5) slh-dsa-128s (post-quantum signatures)
      6) ml-kem-768   (post-quantum KEM)
    Select [1]:
  

  then Path template [%s]: editable
• requires_approval is HARDCODED to 0 — no prompt (doc is wrong)
• Confirmation: Role '%s' registered: curve=%s path=%s (fixed, requires_approval=0). or (range %d-%d, requires_approval=0).
• Loop: Define another role? [y/N]: → y continues, else break
• Mandatory: if (roles_created == 0) { "At least one role must be defined." return -1; }
• No auto-register of default main — user must pick preset 1

Rust (role_wizard):

• Auto-registers default main first before showing menu ❌
• 9 presets (1–9) with 9=Custom, plus 0=Done ❌ (no OTP preset)
• No OTP pad prompts ❌
• Custom: prompts path only, curve auto-detected from path (no curve menu) ⚠️
• No requires_approval prompt (matches C's hardcoded 0) ✅
• No confirmation line ❌
• Loop via 0/Done instead of Define another role? [y/N] ⚠️
• Mandatory ≥1 role satisfied by auto-register (divergent mechanism) ⚠️

Feature	C	Rust	Status
10 presets (incl. OTP)	yes	9, no OTP	❌
Auto-register default main	no	yes	❌
Curve menu (custom)	yes	auto-detect	⚠️
OTP pad dir/name prompts	yes	no	❌
requires_approval prompt	no (hardcoded 0)	no	✅
Confirmation line	yes	no	❌
Loop y/N	yes	0/Done	⚠️
Mandatory ≥1 role	yes	yes (via auto-register)	⚠️

---

Menu 3 — Transport selection

C (prompt_transport_selection):

• Content screen title "Transport — how should other programs reach this signer?"
• Select one or more (type a number to toggle, 'a' for all, Enter to confirm):
• Multi-toggle checkboxes [x]/[ ]:
  1. Local Unix socket
  2. Qubes qrexec bridge
  3. FIPS/TCP listener
  4. HTTP listener
• [a] select all Enter = confirm
• 1-4 toggles bits, a selects all, Enter confirms (≥1 required)
• Default: Unix socket only

Rust (transport_selection):

• Title "Transport selection"
• Single-select (pick one of 4): Unix, TCP, HTTP, Unix+HTTP
• No Qubes qrexec ❌
• No toggle/checkbox UI ❌
• No a for all ❌

Feature	C	Rust	Status
Multi-select toggle	yes	no (single)	❌
Qubes qrexec option	yes	no	❌
a select all	yes	no	❌
Enter to confirm	yes	no	❌
Default Unix	yes	yes	✅

---

Menu 4 — Main status display

C (render_status, g_main_menu_items):

• Frame n_signer v<ver> > Main Menu
• ^*Roles^: + table (Role/Purpose/Curve/Derivation path) or (none)
• ^*Activity (latest first)^: + log entries or (none)
• Status line: session=<locked|unlocked> (<N> words) signer=<name> derived=<count>
• Menu: ^_l^: lock/reunlock, ^_r^: refresh, ^_d^: display connections, ^_q^:/x quit

Rust (render_status, MAIN_MENU_ITEMS):

Feature	C	Rust	Status
Top frame + breadcrumb	yes	yes	✅
Roles table (4 cols)	yes	yes	✅
Activity log	yes	yes	✅
Status line	yes	yes	✅
Menu items l/r/d/q	yes	yes	✅

---

Menu 5 — Approval prompt

C (tui_approval_cb):

• Frame n_signer v<ver> > Approval, title "Approval required"
• caller: <id>
• fips peer: <npub> (<name>) if req->fips_peer_npub present
• method:, role:, purpose:
• ** NEW IDENTITY — will be derived if approved ** if pending_derivation
• ^_y^: allow once, ^_n^: deny, ^_e^: allow this caller+role+verb for session, ^_a^: allow this caller+role for session (all verbs)
• Reads first char, a/e/y → respective policy, else DENY

Rust (approval_prompt):

Feature	C	Rust	Status
caller/method/role/purpose	yes	yes	✅
fips peer field	yes	no	❌
NEW IDENTITY line	yes	no	❌
y/n/e/a options	yes	yes	✅

---

Menu 6 — Display connections

C (render_connections):

• Full screen clear, top frame
• Iterates connection_info entries built from actual active transports (main.c:4086-4190): Unix, FIPS/TCP, HTTP, Qrexec, Stdio
• Each block: ^*<title>^:, connection string, Example: + example, optional extra
• OTP pad status line if bound
• Status line + Press any key to return

Rust (render_connections):

• Hardcoded Unix + HTTP blocks regardless of active transports ❌
• No Qubes qrexec, no FIPS/TCP, no Stdio blocks ❌
• No OTP pad status line ❌
• "Press any key to return" ✅

Feature	C	Rust	Status
Reflects active transports	yes	hardcoded	❌
Qubes qrexec block	yes	no	❌
FIPS/TCP block	yes	no	❌
OTP pad status line	yes	no	❌
Example client commands	yes	partial	⚠️

---

Summary of divergences (from code, not doc)

flowchart TD
  M1[Menu 1 Unlock] --> D1[No q/x exit, no 10-try limit, no second screen]
  M2[Menu 2 Role wizard] --> D2[Auto-registers main, no OTP preset, no curve menu, no confirm line]
  M3[Menu 3 Transport] --> D3[Single-select not multi-toggle, no Qubes]
  M4[Menu 4 Status] --> D4[Matches]
  M5[Menu 5 Approval] --> D5[No NEW IDENTITY line, no fips peer]
  M6[Menu 6 Connections] --> D6[Hardcoded, not transport-aware, no OTP status]

Highest-impact gaps (behavioral divergence from C code)

1. Menu 2 — auto-registers default main before the wizard. C requires the user to pick preset 1 themselves; the Rust port silently creates main and then offers to add more. This changes the first-run UX.
2. Menu 2 — OTP preset (choice 9) missing entirely. Cannot create OTP roles interactively in Rust.
3. Menu 2 — no curve menu for Custom (choice 10). C shows a 6-option curve menu; Rust auto-detects from path.
4. Menu 3 — Qubes qrexec missing and single-select instead of multi-toggle.
5. Menu 1 — no q/x exit, no 10-attempt limit, no second "Enter mnemonic" screen.
6. Menu 5 — missing fips peer field and ** NEW IDENTITY ** line.
7. Menu 6 — hardcoded blocks instead of reflecting actual active transports; no OTP pad status line.

How to spot differences going forward (code-based, not doc-based)

1. Treat src/main.c as the source of truth. The functions to compare against are:
   • prompt_load_mnemonic_tui — Menu 1
   • prompt_named_path_roles — Menu 2
   • prompt_transport_selection — Menu 3
   • render_status — Menu 4
   • tui_approval_cb — Menu 5
   • render_connections — Menu 6
2. Keep this file (plans/menu_gap_analysis.md) as the living checklist; tick rows as the Rust port converges.
3. Recommended automated check: add an integration test that pipes canned stdin through each Rust menu and asserts the rendered output contains the exact prompt strings from the C printf/tui_print calls above (e.g. Mnemonic source: [E]nter existing or [G]enerate new, Define a role:, 9. OTP role (one-time pad encryption), Select one or more (type a number to toggle, 'a' for all, Enter to confirm):, ** NEW IDENTITY — will be derived if approved **). This catches drift mechanically without re-reading the C source each time.