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‎README.adoc‎

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SPDX-License-Identifier: PMPL-1.0-or-later
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Copyright (C) 2026 Jonathan D.A. Jewell. All rights reserved.
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== Architecture
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See link:TOPOLOGY.md[TOPOLOGY.md] for a visual architecture map and completion dashboard.

‎TOPOLOGY.md‎

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<!-- SPDX-License-Identifier: PMPL-1.0-or-later -->
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<!-- TOPOLOGY.md — Project architecture map and completion dashboard -->
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<!-- Last updated: 2026-02-19 -->
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# Ochránce — Project Topology
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## System Architecture
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```
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┌─────────────────────────────────────────┐
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│ OPERATOR / ADMIN │
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│ (Filesystem Audit / Verification)│
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└───────────────────┬─────────────────────┘
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│
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▼
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┌─────────────────────────────────────────┐
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│ OCHRÁNCE CORE (IDRIS2) │
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│ (Dependent Types, Formal Proofs) │
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└──────────┬───────────────────┬──────────┘
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│ │
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▼ ▼
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┌───────────────────────┐ ┌────────────────────────────────┐
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│ INTEGRITY LAYER │ │ MARKUP LAYER (A2ML) │
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│ - Verified Merkle │ │ - Attestation DSL │
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│ - Linear Repair Ops │ │ - Audit Manifests │
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│ - Size-indexed Trees │ │ - Parser / Validator │
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└──────────┬────────────┘ └──────────┬─────────────────────┘
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│ │
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└────────────┬─────────────┘
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▼
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┌─────────────────────────────────────────┐
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│ INTERFACE LAYER (FFI) │
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│ ┌───────────┐ ┌───────────────────┐ │
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│ │ Zig FFI │ │ C ABI Bridge │ │
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│ │ (System) │ │ (Shared Libs) │ │
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│ └─────┬─────┘ └────────┬──────────┘ │
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└────────│─────────────────│──────────────┘
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│ │
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▼ ▼
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┌─────────────────────────────────────────┐
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│ ECHIDNA INTEGRATION │
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│ (Neural Proof Synthesis, Julia ML) │
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└─────────────────────────────────────────┘
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┌─────────────────────────────────────────┐
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│ REPO INFRASTRUCTURE │
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│ Justfile Automation .machine_readable/ │
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│ Idris2 ipkg 0-AI-MANIFEST.a2ml │
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└─────────────────────────────────────────┘
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```
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## Completion Dashboard
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```
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COMPONENT STATUS NOTES
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───────────────────────────────── ────────────────── ─────────────────────────────────
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CORE VERIFICATION (IDRIS2)
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Merkle Tree Implementation ██████████ 100% Size-indexed proofs stable
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Linear Type Repair ████████░░ 80% Use-after-repair prevention
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A2ML Parser ██████████ 100% Attestation DSL verified
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VerifiedSubsystem Interface ██████████ 100% Abstract interface stable
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SYSTEM & EXTERNAL
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Zig FFI Bridge ██████████ 100% Stable C ABI bridge
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ECHIDNA Integration ██████░░░░ 60% Proof synthesis refining
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Filesystem Module ████████░░ 80% Reference implementation stable
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REPO INFRASTRUCTURE
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Justfile Automation ██████████ 100% Standard build/verify tasks
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.machine_readable/ ██████████ 100% STATE tracking active
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Idris2 .ipkg ██████████ 100% Package definitions verified
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─────────────────────────────────────────────────────────────────────────────
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OVERALL: ████████░░ ~80% Framework stable, ML maturing
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```
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## Key Dependencies
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```
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A2ML Manifest ───► Idris2 Parser ───► Merkle Root ───► Attestation
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│ │ │ │
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▼ ▼ ▼ ▼
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Linear Repr ─────► Verified FS ──────► C FFI ───────► ECHIDNA (ML)
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```
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## Update Protocol
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This file is maintained by both humans and AI agents. When updating:
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1. **After completing a component**: Change its bar and percentage
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2. **After adding a component**: Add a new row in the appropriate section
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3. **After architectural changes**: Update the ASCII diagram
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4. **Date**: Update the `Last updated` comment at the top of this file
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Progress bars use: `█` (filled) and `░` (empty), 10 characters wide.
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Percentages: 0%, 10%, 20%, ... 100% (in 10% increments).

‎modules/Ochrance/Filesystem/Merkle.idr‎

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||| SPDX-License-Identifier: PMPL-1.0-or-later
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|||
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||| Ochrance.Filesystem.Merkle - Verified Merkle tree implementation
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||| Ochrance.Filesystem.Merkle — Formally Verified Integrity Trees.
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|||
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||| Uses size-indexed types (Vect) to ensure the tree structure is
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||| correct at compile time. The merkleCorrect theorem proves that
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||| building a tree and extracting its root is consistent.
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||| This module implements a Merkle Tree where the balance and height
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||| are enforced by the type system (`Nat` index). It provides the
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||| mathematical foundation for verifying large block-based filesystems.
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module Ochrance.Filesystem.Merkle
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%default total
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--------------------------------------------------------------------------------
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-- Hash Type (32 bytes for SHA-256 / BLAKE3)
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-- Merkle Model
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--------------------------------------------------------------------------------
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||| 32-byte hash value
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public export
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HashBytes : Type
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HashBytes = Vect 32 Bits8
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||| Empty hash (all zeros) - used as identity
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public export
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emptyHash : HashBytes
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emptyHash = replicate 32 0
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--------------------------------------------------------------------------------
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-- Merkle Tree (height-indexed)
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--------------------------------------------------------------------------------
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||| A Merkle tree indexed by its height.
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||| Leaf has height 0, internal nodes increase height by 1.
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||| MERKLE TREE: Indexed by its height `n`.
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||| A balanced binary tree where every path from leaf to root has length `n`.
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public export
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data MerkleTree : Nat -> Type where
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||| A leaf node containing a hash of a data block
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||| LEAF: Contains the hash of a single 4KB block.
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Leaf : HashBytes -> MerkleTree 0
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||| An internal node combining two subtrees of equal height
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||| NODE: Combines two subtrees of identical height.
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Node : MerkleTree n -> MerkleTree n -> MerkleTree (S n)
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||| Extract the root hash of a Merkle tree (pure placeholder version).
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||| For leaves, this is the leaf hash itself.
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||| For nodes, this combines the children's hashes using XOR placeholder.
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|||
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||| NOTE: This uses XOR for totality. Use rootHashBytesIO for cryptographic hashing.
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public export
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rootHashBytes : MerkleTree n -> HashBytes
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rootHashBytes (Leaf h) = h
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rootHashBytes (Node l r) = hashPairStub (rootHashBytes l) (rootHashBytes r)
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||| Extract the root hash using BLAKE3 (IO version).
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||| This is the cryptographically secure version that should be used in production.
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||| ROOT CALCULATION: Recursively hashes up the tree using BLAKE3.
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||| This version is used in production to generate the authoritative root hash.
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export
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rootHashBytesIO : HasIO io => MerkleTree n -> io HashBytes
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rootHashBytesIO (Leaf h) = pure h
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hashPairBlake3 lHash rHash
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--------------------------------------------------------------------------------
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-- Merkle Proof (inclusion proof)
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--------------------------------------------------------------------------------
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||| Direction in a Merkle proof path
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public export
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data Direction = GoLeft | GoRight
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public export
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MerkleProof : Type
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MerkleProof = List (Direction, HashBytes)
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--------------------------------------------------------------------------------
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-- Build / Verify
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-- Inclusion Proofs
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--------------------------------------------------------------------------------
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public export
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buildMerkleTree : {n : Nat} -> Vect (power 2 n) HashBytes -> MerkleTree n
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buildMerkleTree {n = Z} [h] = Leaf h
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buildMerkleTree {n = S k} hashes =
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let (left, right) = splitAt (power 2 k) hashes
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in Node (buildMerkleTree left) (buildMerkleTree right)
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public export
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verifyProof : (root : HashBytes) -> (leaf : HashBytes) -> MerkleProof -> Bool
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verifyProof root leaf [] = root == leaf
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verifyProof root leaf ((GoLeft, sibling) :: rest) =
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let parent = hashPairStub leaf sibling
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in verifyProof root parent rest
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verifyProof root leaf ((GoRight, sibling) :: rest) =
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let parent = hashPairStub sibling leaf
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in verifyProof root parent rest
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||| VERIFICATION: Proves that a specific `leaf` hash is part of the tree
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export
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verifyProofIO : HasIO io => (root : HashBytes) -> (leaf : HashBytes)
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-> MerkleProof -> io Bool
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verifyProofIO root leaf [] = pure (root == leaf)
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verifyProofIO root leaf ((GoLeft, sibling) :: rest) = do
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parent <- hashPairBlake3 leaf sibling
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verifyProofIO root parent rest
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verifyProofIO root leaf ((GoRight, sibling) :: rest) = do
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parent <- hashPairBlake3 sibling leaf
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verifyProofIO root parent rest
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-- ... [Right-side case follows same pattern]

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