Andy Dixon
be09659f8f
genkey optionally takes a second passphrase that unlocks a separate decoy identity. Every command run with it sees and changes only decoy files; records sealed to the other key are skipped silently. The key file always carries two equal-size slots in random order, with random bytes in an unused slot, and both slots are always tried. init seeds each vault with 8-32 entries sealed to a discarded key, so real files are indistinguishable from filler to a decoy-only holder.
48 lines
1.9 KiB
Markdown
48 lines
1.9 KiB
Markdown
# CLAUDE.md
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This file provides guidance to Claude Code when working with this repository.
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## Overview
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vault is a post-quantum encrypted file vault: one `package main` at the repo
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root that builds a single `vault` binary. Module `github.com/andydixon/vault`.
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- `main.go` - CLI: `genkey`, `init`, `add`, `list`, `get`, `mv`, `rm`.
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- `keyfile.go` - key file with two passphrase slots (Argon2id +
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XChaCha20-Poly1305 sealing a suite ID and 32-byte master seed). The second
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slot is either a decoy identity or random bytes; slot order is random.
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- `store.go` - on-disk vault: `records/` holds fixed-size encrypted catalogue
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records, `objects/` holds padded encrypted file bodies. Records a key cannot
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open are skipped, not treated as errors.
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- `internal/pqcrypt` - file encryption (header + STREAM ChaCha20-Poly1305),
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suite registry, hybrid FrodoKEM-640 + ML-KEM-768 default suite.
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- `internal/format`, `internal/stream`, `internal/term` - header encoding,
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chunked payload encryption, terminal passphrase prompts.
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## Commands
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```sh
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go test ./...
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go build .
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```
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End-to-end check:
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```sh
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export VAULT_PASSPHRASE=test VAULT_KEY=$PWD/k VAULT_DIR=$PWD/s
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./vault genkey && ./vault init && ./vault add README.md docs && ./vault list
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```
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## Invariants
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- Never write a seed or private key unencrypted.
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- Keep suite IDs, stanza tags, HKDF info strings and `fileKeySize` (32) stable.
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- Every ciphertext's mtime is pinned to the epoch; records stay one fixed
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size; objects stay bucket-padded. These hide metadata from the storage host.
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- An object's plaintext starts with its own ID, binding it to its record.
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- `get` publishes output only after the entire object has authenticated.
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- Decoy deniability: both key slots stay the same size and are both always
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tried; `init` always writes filler; foreign records are skipped silently.
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- Keep dependencies pure Go.
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- Diagnostics go to standard error, lower-case, no trailing full stops.
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