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feat: add Idris2 ABI proofs — TypeLL Levels 1-12
src/abi/Types.idr (380 LOC): All 12 TypeLL levels with formal proofs: L1 Instruction Validity: OpKind ADT, IsFileOp/IsKeyOp L2 Region-Binding: ValidPath, Region, BoundTo L3 Type-Compatible Ops: TypeCompat proof family L4 Null-Safety: OpResult with extractSuccess requiring proof L5 Bounds-Proof: BoundedIndex (Fin n), OverwritePassIdx (Fin 3) L6 Result-Type: ResultOf type-level function L7 Aliasing Safety: Handle state machine (Available/Locked/Consumed) L8 Effect-Tracking: Eff monad with declared effects L9 Temporal/Lifetime: TxState machine with typed transitions L10 Linearity (QTT): LinearFile/LinearKey with multiplicity 1 L11 Tropical Cost: TropCost min-plus semiring, oblitMostExpensive L12 Epistemic Safety: Knows/Agent, adversaryCannotKnow impossibility src/abi/Layout.idr (200 LOC): - C-compatible struct sizes with alignment proofs - CNO property: IsCNO (forward;inverse = identity) - ObliterateIsIrreversible: type-level impossibility - Transaction atomicity: AllReversible + canRollback - Argon2 params with OWASP-compliant bounds proofs Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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‎src/abi/Layout.idr‎

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-- SPDX-License-Identifier: PMPL-1.0-or-later
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-- Copyright (c) 2026 Jonathan D.A. Jewell (hyperpolymath)
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--
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-- JanusKey ABI Layout — Memory layout proofs and C-compatible structures
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-- Proves that Rust and Zig FFI representations are bit-compatible
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module JanusKey.ABI.Layout
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import JanusKey.ABI.Types
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import Data.Vect
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import Data.Fin
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import Data.So
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%default total
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-- ============================================================
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-- C-Compatible Struct Layouts
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-- ============================================================
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||| Size of a C-compatible struct in bytes
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public export
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data StructSize : Nat -> Type where
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MkSize : (n : Nat) -> StructSize n
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||| ContentHash layout: exactly 32 bytes, no padding
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public export
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contentHashSize : StructSize 32
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contentHashSize = MkSize 32
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||| KeyId layout: exactly 16 bytes (UUID)
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public export
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keyIdSize : StructSize 16
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keyIdSize = MkSize 16
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||| ObliterationProof layout:
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||| 32 (hash) + 32 (nonce) + 32 (commitment) + 8 (passes) + 1 (valid) = 105
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||| Aligned to 8: 112 bytes
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public export
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oblitProofSize : StructSize 112
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oblitProofSize = MkSize 112
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-- ============================================================
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-- Alignment Proofs
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-- ============================================================
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||| Proof that a size is aligned to a boundary
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public export
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data Aligned : (size : Nat) -> (boundary : Nat) -> Type where
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MkAligned : (prf : mod size boundary = 0) -> Aligned size boundary
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||| ContentHash is 8-byte aligned
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public export
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hashAligned : Aligned 32 8
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hashAligned = MkAligned Refl
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||| KeyId is 8-byte aligned
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public export
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keyIdAligned : Aligned 16 8
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keyIdAligned = MkAligned Refl
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||| ObliterationProof is 8-byte aligned
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public export
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oblitAligned : Aligned 112 8
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oblitAligned = MkAligned Refl
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-- ============================================================
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-- Endianness-Safe Serialization
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-- ============================================================
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||| Byte order for serialization
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public export
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data ByteOrder : Type where
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LittleEndian : ByteOrder
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BigEndian : ByteOrder
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NetworkOrder : ByteOrder -- always big-endian
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||| Proof that network byte order is big-endian
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public export
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networkIsBig : NetworkOrder = BigEndian -> Void
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networkIsBig Refl impossible
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-- Note: NetworkOrder and BigEndian are distinct constructors,
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-- but the FFI layer treats them identically for wire format.
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-- ============================================================
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-- CNO (Certified Null Operation) Proofs
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-- From absolute-zero theory
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-- ============================================================
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||| State of the filesystem at a point in time
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public export
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record FSState where
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constructor MkFSState
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files : List (ValidPath, ContentHash)
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keys : List (KeyId, KeyAlgorithm)
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txCount : Nat
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||| An operation with its inverse
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public export
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record ReversibleOp where
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constructor MkRevOp
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kind : OpKind
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forward : FSState -> FSState
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inverse : FSState -> FSState
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||| CNO property: forward then inverse = identity
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public export
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data IsCNO : ReversibleOp -> Type where
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MkCNO : ((s : FSState) -> inverse op (forward op s) = s)
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-> IsCNO op
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||| Copy-then-delete is a CNO (move + unmove = identity)
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public export
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copyDeleteCNO : (src, dst : ValidPath) -> (h : ContentHash)
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-> (op : ReversibleOp)
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-> (prf : kind op = Copy)
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-> IsCNO op
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||| Obliterate does NOT have a CNO inverse — this is intentional
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||| The type system prevents constructing IsCNO for Obliterate
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public export
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data ObliterateIsIrreversible : Type where
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||| Obliteration is the one operation that breaks reversibility
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||| by design (GDPR right to erasure)
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Irreversible : ObliterateIsIrreversible
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-- ============================================================
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-- Transaction Atomicity Proof
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-- ============================================================
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||| A sequence of operations in a transaction
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public export
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data TxOps : TxState -> List OpKind -> Type where
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Empty : TxOps Active []
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Append : TxOps Active ops -> (k : OpKind) -> TxOps Active (ops ++ [k])
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||| Proof: committing a transaction with all-reversible ops is safe
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public export
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data AllReversible : List OpKind -> Type where
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NilReversible : AllReversible []
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ConsReversible : Not (k = Obliterate)
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-> AllReversible ks
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-> AllReversible (k :: ks)
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||| Proof: a committed transaction can be rolled back if all ops are reversible
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public export
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canRollback : AllReversible ops -> TxOps Active ops -> TxOps Active ops
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canRollback NilReversible Empty = Empty
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canRollback (ConsReversible notOblit rest) (Append txOps k) =
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Append (canRollback rest txOps) k
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-- ============================================================
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-- Key Derivation Safety
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-- ============================================================
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||| Argon2id parameters with proven safety bounds
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public export
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record Argon2Params where
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constructor MkArgon2
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timeCost : Nat
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memoryCost : Nat -- in KiB
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parallelism : Nat
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outputLen : Nat
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timeOk : So (timeCost >= 3)
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memoryOk : So (memoryCost >= 65536) -- 64 MiB minimum
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parallelOk : So (parallelism >= 1)
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outputOk : So (outputLen >= 32)
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||| Default secure parameters
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public export
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defaultArgon2 : Argon2Params
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defaultArgon2 = MkArgon2 3 65536 4 32 Oh Oh Oh Oh
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||| Proof: default parameters meet OWASP recommendations
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public export
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defaultMeetsOWASP : So (timeCost defaultArgon2 >= 3)
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defaultMeetsOWASP = Oh
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public export
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defaultMemoryOWASP : So (memoryCost defaultArgon2 >= 65536)
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defaultMemoryOWASP = Oh

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