Commit `cf9e40ad0b`

cf9e40ad0b45dc0066f63c68ce1888572e7596c3

Verified · cmc

cmc <hello@cleberg.net> · 2026-09-17 06:24 UTC

Start over in Swift

Replace the Rust program with a Swift package: shared core library plus
a CLI for macOS, Linux, and Windows, with an iOS/macOS app to follow.
This commit holds the design spec, license, and README skeleton.

Layout: unified · split

.gitignore added +5

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	1	.build/
	2	.swiftpm/
	3	DerivedData/
	4	.DS_Store
	5	*.kc

LICENSE added +12

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	1	Copyright (C) 2026 krazy warez
	2
	3	Permission to use, copy, modify, and/or distribute this software for any
	4	purpose with or without fee is hereby granted.
	5
	6	THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
	7	WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
	8	MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
	9	ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
	10	WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
	11	ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
	12	OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

README.md added +13

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	1	# keycask
	2
	3	Command-line password manager. One passphrase-encrypted vault file.
	4	Swift, runs on macOS, Linux, and Windows.
	5
	6	Work in progress. Design: `docs/superpowers/specs/2026-09-17-keycask-design.md`.
	7
	8	## develop
	9
	10	```sh
	11	swift build
	12	swift test
	13	```

docs/superpowers/specs/2026-09-17-keycask-design.md added +298

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	1	# keycask design
	2
	3	Swift password manager: a shared core library, a command-line tool for
	4	macOS, Linux, and Windows, and later an iOS/macOS app and an AutoFill
	5	extension. This document covers the core and the CLI. The app and the
	6	extension get their own specs on top of a working core.
	7
	8	The repository history before this commit was a Rust program of the same
	9	name. Nothing here is constrained by it: not the vault format, not the
	10	command set, not the tests.
	11
	12	## Goals
	13
	14	- One vault file, encrypted with a passphrase, readable by every target
	15	including a sandboxed iOS app.
	16	- A core library with no platform dependencies beyond Foundation and
	17	swift-crypto, so the CLI and the apps share all logic.
	18	- A CLI that covers daily use and is scriptable: `--json` on reads,
	19	stable exit codes, a non-interactive passphrase path.
	20	- Identical behavior on macOS, Linux, and Windows, verified by one test
	21	suite.
	22
	23	## Non-goals for this slice
	24
	25	- The app and the AutoFill extension.
	26	- Sync of any kind.
	27	- TOTP, import/export, audit, password history, multiple recipients,
	28	changing the passphrase, QR output, man pages, shell completions.
	29	- Reading vaults from the Rust version.
	30	- A config file.
	31
	32	## Repository and package
	33
	34	One SwiftPM package at the repository root. `swift-tools-version:6.4`,
	35	Swift 6 language mode.
	36
	37	```
	38	Package.swift
	39	Sources/KeycaskCore/ library: model, envelope, generator, resolution, wordlist
	40	Sources/keycask/ executable: ArgumentParser commands, paths, prompt, clipboard, atomic write
	41	Tests/KeycaskCoreTests/ Swift Testing, in-process
	42	Tests/KeycaskCLITests/ Swift Testing, spawns the built binary
	43	docs/superpowers/specs/
	44	.gitbay/ci.yml
	45	LICENSE (0BSD), NOTICE, README.md, .gitignore
	46	```
	47
	48	Dependencies: `apple/swift-crypto` and `apple/swift-argument-parser`.
	49	Nothing else. `Package.resolved` is committed.
	50
	51	`KeycaskCore` imports Foundation and Crypto only. It never imports
	52	ArgumentParser, AppKit, UIKit, or spawns a process. Everything that
	53	touches a terminal, a path convention, the clipboard, or a subprocess
	54	lives in the executable target. A future app target links `KeycaskCore`
	55	and supplies its own versions of those pieces.
	56
	57	`platforms:` in the manifest lists `.macOS(.v14)` and `.iOS(.v17)`. That
	58	sets Apple minimums only and has no effect on Linux or Windows.
	59
	60	## Vault file format
	61
	62	The file is a JSON envelope. It is inspectable with any JSON tool and
	63	versioned without a hand-written binary parser.
	64
	65	```json
	66	{
	67	"format": 1,
	68	"kdf": {
	69	"name": "pbkdf2-hmac-sha256",
	70	"iterations": 600000,
	71	"salt": "<base64, 16 random bytes>"
	72	},
	73	"box": "<base64, ChaCha20-Poly1305 combined nonce \|\| ciphertext \|\| tag>"
	74	}
	75	```
	76
	77	- Key: 32 bytes from PBKDF2-HMAC-SHA256 over the passphrase, encoded as
	78	UTF-8 after NFC normalization, with the salt and iteration count from
	79	the envelope. PBKDF2 comes from swift-crypto's `_CryptoExtras`.
	80	- Salt: 16 random bytes generated by `init`, kept unchanged across saves.
	81	- Nonce: 12 random bytes, fresh on every save. `box` is the
	82	`ChaChaPoly.SealedBox.combined` bytes.
	83	- Plaintext: the JSON-encoded vault from the next section.
	84	- No additional authenticated data.
	85
	86	Decryption outcomes:
	87
	88	- Authentication failure, for any reason including a wrong passphrase,
	89	is "cannot decrypt". The two cases are never distinguished.
	90	- A file that is not valid JSON, does not match the envelope shape, has
	91	an unknown `kdf.name`, or has a `format` other than 1 is "corrupt".
	92	- Plaintext that decrypts but does not decode as a vault is "corrupt".
	93
	94	Writing an envelope reuses the salt and iteration count of the envelope
	95	that was read, so a vault created with one KDF setting keeps it until a
	96	future explicit rekey command exists.
	97
	98	## Data model
	99
	100	```swift
	101	public struct Vault: Codable, Sendable {
	102	public var entries: [Entry]
	103	}
	104
	105	public struct Entry: Codable, Sendable {
	106	public let id: EntryID
	107	public var name: String
	108	public var username: String?
	109	public var password: String
	110	public var url: String?
	111	public var notes: String?
	112	public var tags: [String]
	113	public let created: Date
	114	public var updated: Date
	115	}
	116	```
	117
	118	- `EntryID` is eight characters from the alphabet `a-z` without `l` and
	119	`o`, plus digits `2-9`: 32 symbols, 40 bits. IDs are generated with
	120	`SystemRandomNumberGenerator` and checked for uniqueness against the
	121	vault on insert. They are shown in every listing. Names are labels and
	122	may repeat; the ID is the identity.
	123	- `tags` is kept sorted and free of duplicates, with case preserved, by
	124	the mutation methods on `Vault`. Comparison for `--tag` filters is
	125	case-insensitive.
	126	- Dates are ISO 8601 in UTC with whole-second precision.
	127	- Encoding uses sorted keys and a fixed date strategy so the same vault
	128	always produces the same plaintext bytes. Foundation's `UUID` is not
	129	used anywhere.
	130
	131	`Vault` exposes: `add(_:)`, `remove(id:)`, `update(id:_:)`,
	132	`resolve(_ ref: String) throws -> Entry`, `filter(tag:)`,
	133	`search(_ query: String)`.
	134
	135	## Resolution
	136
	137	Every command that names an entry takes a `REF`.
	138
	139	1. If `REF` equals an entry's ID, that entry.
	140	2. Otherwise, if exactly one entry has `name == REF`, that entry.
	141	3. Otherwise, if several entries have that name, error "ambiguous",
	142	listing each candidate's ID, username, and URL. Exit 5.
	143	4. Otherwise, error "not found". Exit 3.
	144
	145	There is no prefix matching. IDs are short by design so they are typed
	146	whole. A name that happens to equal another entry's ID resolves to the
	147	ID; the listing shows both, so the user can see it.
	148
	149	## CLI
	150
	151	Built with swift-argument-parser. Root command `keycask`, global option
	152	`--vault PATH`.
	153
	154	\| Command \| Behavior \|
	155	\|---\|---\|
	156	\| `init` \| Prompts for the passphrase twice, creates an empty vault. Fails with exit 1 if the file exists. \|
	157	\| `add NAME [-u USER] [--url URL] [--notes TEXT] [--tag T]... [--generate] [--length N] [--words N]` \| Prompts for the password unless `--generate` or `--words` is given. Prints the new ID. \|
	158	\| `show REF [--reveal] [--field NAME] [--json]` \| Text: one field per line, password masked unless `--reveal`. `--field` prints that one value raw, with no masking, for scripts. \|
	159	\| `ls [--tag T] [--json]` \| One row per entry: id, name, username, url. Sorted by name, then id. \|
	160	\| `find QUERY [--json]` \| Case-insensitive substring match over name, username, url, notes, and tags. Same output shape as `ls`. \|
	161	\| `edit REF [--name N] [-u USER] [--url URL] [--notes TEXT] [--tag T]... [--untag T]... [--password] [--generate] [--length N] [--words N]` \| Applies the given changes. `--password` prompts. Any change sets `updated`. No flags is a usage error. \|
	162	\| `rm REF [--yes]` \| Asks for confirmation on a TTY unless `--yes`. Without a TTY and without `--yes`, exit 2. \|
	163	\| `generate [--length N] [--words N] [--copy]` \| Prints a password. Does not open the vault. `--copy` goes to the clipboard instead of stdout. \|
	164	\| `clip REF [--field NAME]` \| Copies the field (default `password`) and clears it after 45 seconds if the clipboard still holds it. \|
	165	\| `clipboard-daemon` \| Hidden. The detached child that performs the delayed clear. \|
	166
	167	Output rules:
	168
	169	- `--json` emits one object (`show`) or an array (`ls`, `find`) of
	170	entries with the same field names as the model. `password` is the
	171	string `"********"` unless `--reveal`.
	172	- Text output goes to stdout. Errors go to stderr as one line.
	173	- `--length` defaults to 24. The character alphabet is ASCII upper,
	174	lower, digits, and the symbols `!@#$%^&*()-_=+[]{};:,.<>?`. Every
	175	character is drawn uniformly with `SystemRandomNumberGenerator`.
	176	- `--words N` takes an explicit count. `generate` with neither `--length`
	177	nor `--words` produces a 24-character password. Words come from the EFF long list,
	178	joined with `-`. The list is embedded as one multi-line string literal
	179	in `KeycaskCore` and split on first use. Attribution goes in `NOTICE`.
	180	- `--generate` and `--words` together is a usage error.
	181
	182	Passphrase input: if `KEYCASK_PASSPHRASE` is set, its value is used. It
	183	exists so tests and scripts run unattended. Otherwise the CLI prompts on
	184	the terminal with echo off. No TTY and no variable is exit 2.
	185
	186	Exit codes:
	187
	188	\| Code \| Meaning \|
	189	\|---\|---\|
	190	\| 0 \| ok \|
	191	\| 1 \| failure (I/O, vault exists, clipboard tool missing, and anything else) \|
	192	\| 2 \| usage, including ArgumentParser validation errors and missing passphrase \|
	193	\| 3 \| not found (entry, or vault file) \|
	194	\| 4 \| cannot decrypt \|
	195	\| 5 \| ambiguous name \|
	196
	197	ArgumentParser exits with 64 on validation errors by default. `main`
	198	calls `parseAsRoot()` inside `do/catch`, prints
	199	`fullMessage(for:)` to stderr, and exits 2 instead.
	200
	201	## Platform layer
	202
	203	All in the executable target, each behind a small function with a Unix
	204	and a Windows body where they differ.
	205
	206	- Vault path. `--vault`, else `$KEYCASK_VAULT`, else
	207	`$XDG_DATA_HOME/keycask/vault.kc`, else
	208	`$HOME/.local/share/keycask/vault.kc`. On Windows:
	209	`%LOCALAPPDATA%\keycask\vault.kc`. The directory is created on write.
	210	- Atomic write. Write to `<name>.tmp` beside the target, fsync,
	211	rename over the target. Unix opens the temp file with mode 0600.
	212	Windows uses `MoveFileExW` with `MOVEFILE_REPLACE_EXISTING` because
	213	`rename` fails on an existing target there. The temp file is removed
	214	on any failure.
	215	- Prompt. Reads a line from the terminal with echo off: termios on
	216	Unix, `SetConsoleMode` without `ENABLE_ECHO_INPUT` on Windows.
	217	Restores the mode afterwards, including on error.
	218	- Clipboard. Shell out to the first tool found: `pbcopy`/`pbpaste`
	219	on macOS; `wl-copy`/`wl-paste`, then `xclip -selection clipboard`, on
	220	Linux; `clip.exe` to write and `powershell -command Get-Clipboard` to
	221	read on Windows. No tool found is exit 1 with a message naming the
	222	tools. `clip` spawns `keycask clipboard-daemon` detached with stdout
	223	and stderr to null, writes `{"secret": ..., "previous": ...}` to its
	224	stdin, and exits without waiting. The daemon sets the clipboard,
	225	sleeps 45 seconds, reads the clipboard, and if it still equals the
	226	secret restores `previous` or clears when `previous` is empty.
	227
	228	## Errors
	229
	230	One `KeycaskError` enum in `KeycaskCore` with a case per situation and an
	231	`exitCode` and `message` property. Foundation and Crypto errors are
	232	wrapped into it at the call site that produced them; nothing outside
	233	`KeycaskCore` sees a raw `CryptoKitError` or `CocoaError`. The
	234	executable's `main` catches `KeycaskError`, prints `message` to stderr,
	235	and exits with `exitCode`. Any other error is a bug and exits 1 with its
	236	description.
	237
	238	## Testing
	239
	240	Swift Testing on all targets.
	241
	242	Core, in process:
	243
	244	- Envelope: encrypt then decrypt round-trips; wrong passphrase is
	245	`cannotDecrypt`; one flipped byte in `box` is `cannotDecrypt`;
	246	non-JSON, wrong `format`, and unknown `kdf.name` are `corrupt`; the
	247	salt is preserved across a save and the nonce is not; a PBKDF2 vector
	248	from a published source matches.
	249	- Model: encoding the same vault twice yields identical bytes; tags are
	250	sorted and unique after every mutation; `updated` changes on update.
	251	- ID: length 8, alphabet as specified, insert rejects a duplicate.
	252	- Resolution: ID beats name; unique name resolves; repeated name is
	253	`ambiguous` with all candidates; unknown is `notFound`.
	254	- Generator: requested length; only alphabet characters; word count and
	255	separator; every word is in the list.
	256	- Search: case-insensitive, matches each searchable field, no match
	257	returns empty.
	258
	259	CLI, black box:
	260
	261	- Locates the built `keycask` binary from the test bundle's products
	262	directory.
	263	- Each test gets its own temp directory and runs the binary with
	264	`KEYCASK_VAULT` pointing into it and `KEYCASK_PASSPHRASE` set. Tests
	265	are independent and may run in parallel.
	266	- Covers every command's happy path, every exit code, `--json` shape,
	267	masking versus `--reveal`, `--field` raw output, the ambiguous-name
	268	listing, `rm` without `--yes` and without a TTY, `edit` with no flags,
	269	`--generate` with `--words`, and `init` on an existing vault.
	270	- The clipboard daemon's restore decision is unit-tested in process;
	271	the tests do not touch the real clipboard.
	272
	273	The CLI suite is the conformance suite. When the app exists, its
	274	behavior is checked against the same expectations.
	275
	276	## CI and release
	277
	278	`.gitbay/ci.yml`, Linux runner:
	279
	280	1. Install swiftly into `$HOME` if missing, then the Swift 6.4
	281	toolchain. `$HOME` persists across builds so this is a one-time cost.
	282	2. `swift format lint --strict --recursive Sources Tests`
	283	3. `swift build`
	284	4. `swift test`
	285
	286	macOS and Windows are built and tested by hand until runners exist for
	287	them.
	288
	289	Releases are annotated git tags `vX.Y.Z`. The Homebrew formula lives in
	290	a separate tap repository and builds the tagged source with
	291	`swift build -c release --product keycask`. Prebuilt Linux and Windows
	292	binaries are a later addition.
	293
	294	## Workflow
	295
	296	The root commit of this history is the wipe: this spec, the license,
	297	`.gitignore`, and a README skeleton, pushed directly to `main`. Every
	298	change after it goes through a branch and a merge request.

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