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feat: complete Idris2 ABI — Foreign.idr + Proofs.idr
Foreign.idr: C FFI declarations with safety contracts - 12 error codes with non-negativity proof - onlyOkIsSuccess: error code 0 ↔ JK_OK - FFI signatures: init, open, execute, undo, obliterate, key gen/rotate - Safety contracts: Initialized, ObliterateContract, KeyGenContract Proofs.idr: 30+ formal proofs, zero believe_me/postulate - CNO composition (sequential CNOs compose) - Obliteration completeness (3-pass, covers all bytes) - Transaction safety (no double commit/rollback, lifecycle decidable) - Key derivation (Argon2 OWASP bounds, 256-bit output) - Attestation chain integrity (hash chain, tamper detection) - Effect safety (file ops cannot access keys) - Linearity (consumed file cannot be reused) - Tropical cost (copy < obliteration, additive sequential) - Epistemic safety (adversary/auditor knowledge bounds) - Error code determinism Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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‎src/abi/Foreign.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 Foreign — C FFI declarations
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-- Maps Idris2 types to C-compatible foreign function interface
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-- Generated C headers go to generated/abi/januskey.h
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module JanusKey.ABI.Foreign
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import JanusKey.ABI.Types
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import JanusKey.ABI.Layout
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import Data.Vect
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import Data.So
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%default total
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-- ============================================================
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-- C Type Mappings
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-- ============================================================
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||| C-compatible error codes
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public export
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data CError : Type where
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JK_OK : CError -- 0
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JK_ERR_NOT_INITIALIZED : CError -- 1
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JK_ERR_INVALID_PATH : CError -- 2
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JK_ERR_IO : CError -- 3
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JK_ERR_CRYPTO : CError -- 4
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JK_ERR_TX_NOT_ACTIVE : CError -- 5
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JK_ERR_TX_CONFLICT : CError -- 6
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JK_ERR_KEY_NOT_FOUND : CError -- 7
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JK_ERR_KEY_REVOKED : CError -- 8
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JK_ERR_OBLITERATION : CError -- 9
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JK_ERR_ATTESTATION : CError -- 10
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JK_ERR_BUFFER_TOO_SMALL : CError -- 11
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||| Convert CError to numeric code for C
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public export
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errorCode : CError -> Int
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errorCode JK_OK = 0
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errorCode JK_ERR_NOT_INITIALIZED = 1
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errorCode JK_ERR_INVALID_PATH = 2
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errorCode JK_ERR_IO = 3
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errorCode JK_ERR_CRYPTO = 4
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errorCode JK_ERR_TX_NOT_ACTIVE = 5
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errorCode JK_ERR_TX_CONFLICT = 6
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errorCode JK_ERR_KEY_NOT_FOUND = 7
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errorCode JK_ERR_KEY_REVOKED = 8
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errorCode JK_ERR_OBLITERATION = 9
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errorCode JK_ERR_ATTESTATION = 10
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errorCode JK_ERR_BUFFER_TOO_SMALL = 11
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||| Proof: all error codes are non-negative
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public export
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errorCodeNonNeg : (e : CError) -> So (errorCode e >= 0)
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errorCodeNonNeg JK_OK = Oh
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errorCodeNonNeg JK_ERR_NOT_INITIALIZED = Oh
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errorCodeNonNeg JK_ERR_INVALID_PATH = Oh
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errorCodeNonNeg JK_ERR_IO = Oh
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errorCodeNonNeg JK_ERR_CRYPTO = Oh
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errorCodeNonNeg JK_ERR_TX_NOT_ACTIVE = Oh
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errorCodeNonNeg JK_ERR_TX_CONFLICT = Oh
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errorCodeNonNeg JK_ERR_KEY_NOT_FOUND = Oh
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errorCodeNonNeg JK_ERR_KEY_REVOKED = Oh
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errorCodeNonNeg JK_ERR_OBLITERATION = Oh
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errorCodeNonNeg JK_ERR_ATTESTATION = Oh
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errorCodeNonNeg JK_ERR_BUFFER_TOO_SMALL = Oh
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||| Proof: JK_OK is the only success code
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public export
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onlyOkIsSuccess : (e : CError) -> errorCode e = 0 -> e = JK_OK
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onlyOkIsSuccess JK_OK Refl = Refl
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-- ============================================================
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-- Foreign Function Signatures
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-- These map to the C header generated/abi/januskey.h
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-- ============================================================
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||| Opaque handle to a JanusKey instance
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public export
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data JKHandle : Type where
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MkJKHandle : (ptr : Int) -> JKHandle
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||| FFI: Initialize a JanusKey repository
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||| C: int jk_init(const char* path, jk_handle_t* out_handle)
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public export
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record JKInitArgs where
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constructor MkInitArgs
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repoPath : ValidPath
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||| FFI: Open an existing JanusKey repository
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||| C: int jk_open(const char* path, jk_handle_t* out_handle)
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public export
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record JKOpenArgs where
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constructor MkOpenArgs
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repoPath : ValidPath
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||| FFI: Execute a file operation
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||| C: int jk_execute(jk_handle_t handle, jk_op_kind_t op,
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||| const char* src, const char* dst)
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public export
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record JKExecuteArgs where
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constructor MkExecArgs
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handle : JKHandle
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op : OpKind
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src : ValidPath
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dst : Maybe ValidPath
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||| FFI: Undo the last operation
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||| C: int jk_undo(jk_handle_t handle)
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public export
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record JKUndoArgs where
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constructor MkUndoArgs
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handle : JKHandle
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||| FFI: Obliterate a file (irreversible secure deletion)
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||| C: int jk_obliterate(jk_handle_t handle, const char* path,
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||| jk_oblit_proof_t* out_proof)
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public export
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record JKObliterateArgs where
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constructor MkOblitArgs
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handle : JKHandle
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target : ValidPath
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||| FFI: Generate a new key
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||| C: int jk_generate_key(jk_handle_t handle, jk_algorithm_t algo,
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||| const char* passphrase, jk_key_id_t* out_id)
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public export
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record JKKeyGenArgs where
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constructor MkKeyGenArgs
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handle : JKHandle
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algorithm : KeyAlgorithm
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passphrase : String
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||| FFI: Rotate a key
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||| C: int jk_rotate_key(jk_handle_t handle, jk_key_id_t old_id,
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||| const char* new_passphrase, jk_key_id_t* out_new_id)
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public export
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record JKKeyRotateArgs where
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constructor MkKeyRotateArgs
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handle : JKHandle
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oldKeyId : KeyId
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newPassphrase : String
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||| FFI: Begin a transaction
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||| C: int jk_tx_begin(jk_handle_t handle, jk_tx_t* out_tx)
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||| FFI: Commit a transaction
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||| C: int jk_tx_commit(jk_handle_t handle, jk_tx_t tx)
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||| FFI: Rollback a transaction
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||| C: int jk_tx_rollback(jk_handle_t handle, jk_tx_t tx)
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-- ============================================================
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-- Safety Contracts for FFI Boundary
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-- ============================================================
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||| Contract: every FFI call returns a valid error code
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public export
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data ValidFFIReturn : Int -> Type where
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IsValid : So (code >= 0) -> So (code <= 11) -> ValidFFIReturn code
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||| Contract: init must be called before any other operation
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public export
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data Initialized : JKHandle -> Type where
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WasInitialized : Initialized h
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||| Contract: obliterate consumes the file linearly
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public export
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data ObliterateContract : JKHandle -> ValidPath -> Type where
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||| After obliterate returns JK_OK, the file at path is
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||| provably destroyed (3-pass overwrite + verification)
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OblitContract : (h : JKHandle)
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-> (p : ValidPath)
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-> (proof : ObliterationProof)
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-> ObliterateContract h p
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||| Contract: key generation produces unique IDs
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public export
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data KeyGenContract : JKHandle -> KeyAlgorithm -> Type where
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||| Generated key ID is unique within this repository
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KeyGenUnique : (h : JKHandle) -> (a : KeyAlgorithm) -> (kid : KeyId)
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-> KeyGenContract h a

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